FlatCAM/flatcamEditors/FlatCAMGeoEditor.py

# ######################################################### ##
# FlatCAM: 2D Post-processing for Manufacturing            #
# http://flatcam.org                                       #
# Author: Juan Pablo Caram (c)                             #
# Date: 2/5/2014                                           #
# MIT Licence                                              #
# ######################################################### ##

# ###########################################################                                      #
# File Modified: Marius Adrian Stanciu (c)                 #
# Date: 3/10/2019                                          #
# ######################################################### ##

from PyQt5 import QtGui, QtCore, QtWidgets
from PyQt5.QtCore import Qt, QSettings
from camlib import *
from FlatCAMTool import FlatCAMTool
from flatcamGUI.ObjectUI import LengthEntry, RadioSet

from shapely.geometry import LineString, LinearRing, MultiLineString
# from shapely.geometry import mapping
from shapely.ops import cascaded_union, unary_union
import shapely.affinity as affinity

from numpy import arctan2, Inf, array, sqrt, sign, dot
from numpy.linalg import norm as numpy_norm

from rtree import index as rtindex
from flatcamGUI.GUIElements import OptionalInputSection, FCCheckBox, FCEntry, FCComboBox, FCTextAreaRich, \
    FCTable, FCDoubleSpinner, FCButton, EvalEntry2, FCInputDialog
from flatcamParsers.ParseFont import *

# from vispy.io import read_png
import gettext
import FlatCAMTranslation as fcTranslate
import builtins

fcTranslate.apply_language('strings')
if '_' not in builtins.__dict__:
    _ = gettext.gettext


class BufferSelectionTool(FlatCAMTool):
    """
    Simple input for buffer distance.
    """

    toolName = "Buffer Selection"

    def __init__(self, app, draw_app):
        FlatCAMTool.__init__(self, app)

        self.draw_app = draw_app

        # Title
        title_label = QtWidgets.QLabel("%s" % ('Editor ' + self.toolName))
        title_label.setStyleSheet("""
                        QLabel
                        {
                            font-size: 16px;
                            font-weight: bold;
                        }
                        """)
        self.layout.addWidget(title_label)

        # this way I can hide/show the frame
        self.buffer_tool_frame = QtWidgets.QFrame()
        self.buffer_tool_frame.setContentsMargins(0, 0, 0, 0)
        self.layout.addWidget(self.buffer_tool_frame)
        self.buffer_tools_box = QtWidgets.QVBoxLayout()
        self.buffer_tools_box.setContentsMargins(0, 0, 0, 0)
        self.buffer_tool_frame.setLayout(self.buffer_tools_box)

        # Form Layout
        form_layout = QtWidgets.QFormLayout()
        self.buffer_tools_box.addLayout(form_layout)

        # Buffer distance
        self.buffer_distance_entry = FCDoubleSpinner()
        self.buffer_distance_entry.set_precision(4)
        self.buffer_distance_entry.set_range(0.0000, 999999.9999)
        form_layout.addRow(_("Buffer distance:"), self.buffer_distance_entry)
        self.buffer_corner_lbl = QtWidgets.QLabel(_("Buffer corner:"))
        self.buffer_corner_lbl.setToolTip(
            _("There are 3 types of corners:\n"
              " - 'Round': the corner is rounded for exterior buffer.\n"
              " - 'Square:' the corner is met in a sharp angle for exterior buffer.\n"
              " - 'Beveled:' the corner is a line that directly connects the features meeting in the corner")
        )
        self.buffer_corner_cb = FCComboBox()
        self.buffer_corner_cb.addItem(_("Round"))
        self.buffer_corner_cb.addItem(_("Square"))
        self.buffer_corner_cb.addItem(_("Beveled"))
        form_layout.addRow(self.buffer_corner_lbl, self.buffer_corner_cb)

        # Buttons
        hlay = QtWidgets.QHBoxLayout()
        self.buffer_tools_box.addLayout(hlay)

        self.buffer_int_button = QtWidgets.QPushButton(_("Buffer Interior"))
        hlay.addWidget(self.buffer_int_button)
        self.buffer_ext_button = QtWidgets.QPushButton(_("Buffer Exterior"))
        hlay.addWidget(self.buffer_ext_button)

        hlay1 = QtWidgets.QHBoxLayout()
        self.buffer_tools_box.addLayout(hlay1)

        self.buffer_button = QtWidgets.QPushButton(_("Full Buffer"))
        hlay1.addWidget(self.buffer_button)

        self.layout.addStretch()

        # Signals
        self.buffer_button.clicked.connect(self.on_buffer)
        self.buffer_int_button.clicked.connect(self.on_buffer_int)
        self.buffer_ext_button.clicked.connect(self.on_buffer_ext)

        # Init GUI
        self.buffer_distance_entry.set_value(0.01)

    def run(self):
        self.app.report_usage("Geo Editor ToolBuffer()")
        FlatCAMTool.run(self)

        # if the splitter us hidden, display it
        if self.app.ui.splitter.sizes()[0] == 0:
            self.app.ui.splitter.setSizes([1, 1])

        self.app.ui.notebook.setTabText(2, _("Buffer Tool"))

    def on_buffer(self):
        try:
            buffer_distance = float(self.buffer_distance_entry.get_value())
        except ValueError:
            # try to convert comma to decimal point. if it's still not working error message and return
            try:
                buffer_distance = float(self.buffer_distance_entry.get_value().replace(',', '.'))
                self.buffer_distance_entry.set_value(buffer_distance)
            except ValueError:
                self.app.inform.emit(_("[WARNING_NOTCL] Buffer distance value is missing or wrong format. "
                                       "Add it and retry."))
                return
        # the cb index start from 0 but the join styles for the buffer start from 1 therefore the adjustment
        # I populated the combobox such that the index coincide with the join styles value (which is really an INT)
        join_style = self.buffer_corner_cb.currentIndex() + 1
        self.draw_app.buffer(buffer_distance, join_style)

    def on_buffer_int(self):
        try:
            buffer_distance = float(self.buffer_distance_entry.get_value())
        except ValueError:
            # try to convert comma to decimal point. if it's still not working error message and return
            try:
                buffer_distance = float(self.buffer_distance_entry.get_value().replace(',', '.'))
                self.buffer_distance_entry.set_value(buffer_distance)
            except ValueError:
                self.app.inform.emit(_("[WARNING_NOTCL] Buffer distance value is missing or wrong format. "
                                       "Add it and retry."))
                return
        # the cb index start from 0 but the join styles for the buffer start from 1 therefore the adjustment
        # I populated the combobox such that the index coincide with the join styles value (which is really an INT)
        join_style = self.buffer_corner_cb.currentIndex() + 1
        self.draw_app.buffer_int(buffer_distance, join_style)

    def on_buffer_ext(self):
        try:
            buffer_distance = float(self.buffer_distance_entry.get_value())
        except ValueError:
            # try to convert comma to decimal point. if it's still not working error message and return
            try:
                buffer_distance = float(self.buffer_distance_entry.get_value().replace(',', '.'))
                self.buffer_distance_entry.set_value(buffer_distance)
            except ValueError:
                self.app.inform.emit(_("[WARNING_NOTCL] Buffer distance value is missing or wrong format. "
                                       "Add it and retry."))
                return
        # the cb index start from 0 but the join styles for the buffer start from 1 therefore the adjustment
        # I populated the combobox such that the index coincide with the join styles value (which is really an INT)
        join_style = self.buffer_corner_cb.currentIndex() + 1
        self.draw_app.buffer_ext(buffer_distance, join_style)

    def hide_tool(self):
        self.buffer_tool_frame.hide()
        self.app.ui.notebook.setCurrentWidget(self.app.ui.project_tab)


class TextInputTool(FlatCAMTool):
    """
    Simple input for buffer distance.
    """

    toolName = "Text Input Tool"

    def __init__(self, app):
        FlatCAMTool.__init__(self, app)

        self.app = app
        self.text_path = []

        self.f_parse = ParseFont(self)
        self.f_parse.get_fonts_by_types()

        # this way I can hide/show the frame
        self.text_tool_frame = QtWidgets.QFrame()
        self.text_tool_frame.setContentsMargins(0, 0, 0, 0)
        self.layout.addWidget(self.text_tool_frame)
        self.text_tools_box = QtWidgets.QVBoxLayout()
        self.text_tools_box.setContentsMargins(0, 0, 0, 0)
        self.text_tool_frame.setLayout(self.text_tools_box)

        # Title
        title_label = QtWidgets.QLabel("%s" % ('Editor ' + self.toolName))
        title_label.setStyleSheet("""
                        QLabel
                        {
                            font-size: 16px;
                            font-weight: bold;
                        }
                        """)
        self.text_tools_box.addWidget(title_label)

        # Form Layout
        self.form_layout = QtWidgets.QFormLayout()
        self.text_tools_box.addLayout(self.form_layout)

        # Font type
        if sys.platform == "win32":
            f_current = QtGui.QFont("Arial")
        elif sys.platform == "linux":
            f_current = QtGui.QFont("FreeMono")
        else:
            f_current = QtGui.QFont("Helvetica Neue")

        self.font_name = f_current.family()

        self.font_type_cb = QtWidgets.QFontComboBox(self)
        self.font_type_cb.setCurrentFont(f_current)
        self.form_layout.addRow("Font:", self.font_type_cb)

        # Flag variables to show if font is bold, italic, both or none (regular)
        self.font_bold = False
        self.font_italic = False

        # # Create dictionaries with the filenames of the fonts
        # # Key: Fontname
        # # Value: Font File Name.ttf
        #
        # # regular fonts
        # self.ff_names_regular ={}
        # # bold fonts
        # self.ff_names_bold = {}
        # # italic fonts
        # self.ff_names_italic = {}
        # # bold and italic fonts
        # self.ff_names_bi = {}
        #
        # if sys.platform == 'win32':
        #     from winreg import ConnectRegistry, OpenKey, EnumValue, HKEY_LOCAL_MACHINE
        #     registry = ConnectRegistry(None, HKEY_LOCAL_MACHINE)
        #     font_key = OpenKey(registry, "SOFTWARE\Microsoft\Windows NT\CurrentVersion\Fonts")
        #     try:
        #         i = 0
        #         while 1:
        #             name_font, value, type = EnumValue(font_key, i)
        #             k = name_font.replace(" (TrueType)", '')
        #             if 'Bold' in k and 'Italic' in k:
        #                 k = k.replace(" Bold Italic", '')
        #                 self.ff_names_bi.update({k: value})
        #             elif 'Bold' in k:
        #                 k = k.replace(" Bold", '')
        #                 self.ff_names_bold.update({k: value})
        #             elif 'Italic' in k:
        #                 k = k.replace(" Italic", '')
        #                 self.ff_names_italic.update({k: value})
        #             else:
        #                 self.ff_names_regular.update({k: value})
        #             i += 1
        #     except WindowsError:
        #         pass

        # Font size
        self.font_size_cb = FCComboBox()
        self.font_size_cb.setEditable(True)
        self.font_size_cb.setMinimumContentsLength(3)
        self.font_size_cb.setMaximumWidth(70)

        font_sizes = ['6', '7', '8', '9', '10', '11', '12', '13', '14',
                      '15', '16', '18', '20', '22', '24', '26', '28',
                      '32', '36', '40', '44', '48', '54', '60', '66',
                      '72', '80', '88', '96']

        for i in font_sizes:
            self.font_size_cb.addItem(i)
        self.font_size_cb.setCurrentIndex(4)

        hlay = QtWidgets.QHBoxLayout()
        hlay.addWidget(self.font_size_cb)
        hlay.addStretch()

        self.font_bold_tb = QtWidgets.QToolButton()
        self.font_bold_tb.setCheckable(True)
        self.font_bold_tb.setIcon(QtGui.QIcon('share/bold32.png'))
        hlay.addWidget(self.font_bold_tb)

        self.font_italic_tb = QtWidgets.QToolButton()
        self.font_italic_tb.setCheckable(True)
        self.font_italic_tb.setIcon(QtGui.QIcon('share/italic32.png'))
        hlay.addWidget(self.font_italic_tb)

        self.form_layout.addRow("Size:", hlay)

        # Text input
        self.text_input_entry = FCTextAreaRich()
        self.text_input_entry.setTabStopWidth(12)
        self.text_input_entry.setMinimumHeight(200)
        # self.text_input_entry.setMaximumHeight(150)
        self.text_input_entry.setCurrentFont(f_current)
        self.text_input_entry.setFontPointSize(10)
        self.form_layout.addRow("Text:", self.text_input_entry)

        # Buttons
        hlay1 = QtWidgets.QHBoxLayout()
        self.form_layout.addRow("", hlay1)
        hlay1.addStretch()
        self.apply_button = QtWidgets.QPushButton("Apply")
        hlay1.addWidget(self.apply_button)

        # self.layout.addStretch()

        # Signals
        self.apply_button.clicked.connect(self.on_apply_button)
        self.font_type_cb.currentFontChanged.connect(self.font_family)
        self.font_size_cb.activated.connect(self.font_size)
        self.font_bold_tb.clicked.connect(self.on_bold_button)
        self.font_italic_tb.clicked.connect(self.on_italic_button)

    def run(self):
        self.app.report_usage("Geo Editor TextInputTool()")
        FlatCAMTool.run(self)

        # if the splitter us hidden, display it
        if self.app.ui.splitter.sizes()[0] == 0:
            self.app.ui.splitter.setSizes([1, 1])

        self.app.ui.notebook.setTabText(2, _("Text Tool"))

    def on_apply_button(self):
        font_to_geo_type = ""

        if self.font_bold is True:
            font_to_geo_type = 'bold'
        elif self.font_italic is True:
            font_to_geo_type = 'italic'
        elif self.font_bold is True and self.font_italic is True:
            font_to_geo_type = 'bi'
        elif self.font_bold is False and self.font_italic is False:
            font_to_geo_type = 'regular'

        string_to_geo = self.text_input_entry.get_value()
        font_to_geo_size = self.font_size_cb.get_value()

        self.text_path = self.f_parse.font_to_geometry(
                    char_string=string_to_geo,
                    font_name=self.font_name,
                    font_size=font_to_geo_size,
                    font_type=font_to_geo_type,
                    units=self.app.ui.general_defaults_form.general_app_group.units_radio.get_value().upper())

    def font_family(self, font):
        self.text_input_entry.selectAll()
        font.setPointSize(float(self.font_size_cb.get_value()))
        self.text_input_entry.setCurrentFont(font)
        self.font_name = self.font_type_cb.currentFont().family()

    def font_size(self):
        self.text_input_entry.selectAll()
        self.text_input_entry.setFontPointSize(float(self.font_size_cb.get_value()))

    def on_bold_button(self):
        if self.font_bold_tb.isChecked():
            self.text_input_entry.selectAll()
            self.text_input_entry.setFontWeight(QtGui.QFont.Bold)
            self.font_bold = True
        else:
            self.text_input_entry.selectAll()
            self.text_input_entry.setFontWeight(QtGui.QFont.Normal)
            self.font_bold = False

    def on_italic_button(self):
        if self.font_italic_tb.isChecked():
            self.text_input_entry.selectAll()
            self.text_input_entry.setFontItalic(True)
            self.font_italic = True
        else:
            self.text_input_entry.selectAll()
            self.text_input_entry.setFontItalic(False)
            self.font_italic = False

    def hide_tool(self):
        self.text_tool_frame.hide()
        self.app.ui.notebook.setCurrentWidget(self.app.ui.project_tab)
        self.app.ui.splitter.setSizes([0, 1])
        self.app.ui.notebook.setTabText(2, _("Tool"))


class PaintOptionsTool(FlatCAMTool):
    """
    Inputs to specify how to paint the selected polygons.
    """

    toolName = "Paint Tool"

    def __init__(self, app, fcdraw):
        FlatCAMTool.__init__(self, app)

        self.app = app
        self.fcdraw = fcdraw

        # Title
        title_label = QtWidgets.QLabel("%s" % ('Editor ' + self.toolName))
        title_label.setStyleSheet("""
                        QLabel
                        {
                            font-size: 16px;
                            font-weight: bold;
                        }
                        """)
        self.layout.addWidget(title_label)

        grid = QtWidgets.QGridLayout()
        self.layout.addLayout(grid)

        # Tool dia
        ptdlabel = QtWidgets.QLabel(_('Tool dia:'))
        ptdlabel.setToolTip(
           _("Diameter of the tool to\n"
             "be used in the operation.")
        )
        grid.addWidget(ptdlabel, 0, 0)

        self.painttooldia_entry = FCEntry()
        grid.addWidget(self.painttooldia_entry, 0, 1)

        # Overlap
        ovlabel = QtWidgets.QLabel(_('Overlap Rate:'))
        ovlabel.setToolTip(
            _("How much (fraction) of the tool width to overlap each tool pass.\n"
              "Example:\n"
              "A value here of 0.25 means 25% from the tool diameter found above.\n\n"
              "Adjust the value starting with lower values\n"
              "and increasing it if areas that should be painted are still \n"
              "not painted.\n"
              "Lower values = faster processing, faster execution on PCB.\n"
              "Higher values = slow processing and slow execution on CNC\n"
              "due of too many paths.")
        )
        grid.addWidget(ovlabel, 1, 0)
        self.paintoverlap_entry = FCEntry()
        self.paintoverlap_entry.setValidator(QtGui.QDoubleValidator(0.0000, 1.0000, 4))
        grid.addWidget(self.paintoverlap_entry, 1, 1)

        # Margin
        marginlabel = QtWidgets.QLabel(_('Margin:'))
        marginlabel.setToolTip(
           _("Distance by which to avoid\n"
             "the edges of the polygon to\n"
             "be painted.")
        )
        grid.addWidget(marginlabel, 2, 0)
        self.paintmargin_entry = FCEntry()
        grid.addWidget(self.paintmargin_entry, 2, 1)

        # Method
        methodlabel = QtWidgets.QLabel(_('Method:'))
        methodlabel.setToolTip(
            _("Algorithm to paint the polygon:<BR>"
              "<B>Standard</B>: Fixed step inwards.<BR>"
              "<B>Seed-based</B>: Outwards from seed.")
        )
        grid.addWidget(methodlabel, 3, 0)
        self.paintmethod_combo = RadioSet([
            {"label": _("Standard"), "value": "standard"},
            {"label": _("Seed-based"), "value": "seed"},
            {"label": _("Straight lines"), "value": "lines"}
        ], orientation='vertical', stretch=False)
        grid.addWidget(self.paintmethod_combo, 3, 1)

        # Connect lines
        pathconnectlabel = QtWidgets.QLabel(_("Connect:"))
        pathconnectlabel.setToolTip(
           _("Draw lines between resulting\n"
             "segments to minimize tool lifts.")
        )
        grid.addWidget(pathconnectlabel, 4, 0)
        self.pathconnect_cb = FCCheckBox()
        grid.addWidget(self.pathconnect_cb, 4, 1)

        contourlabel = QtWidgets.QLabel(_("Contour:"))
        contourlabel.setToolTip(
            _("Cut around the perimeter of the polygon\n"
              "to trim rough edges.")
        )
        grid.addWidget(contourlabel, 5, 0)
        self.paintcontour_cb = FCCheckBox()
        grid.addWidget(self.paintcontour_cb, 5, 1)

        # Buttons
        hlay = QtWidgets.QHBoxLayout()
        self.layout.addLayout(hlay)
        hlay.addStretch()
        self.paint_button = QtWidgets.QPushButton(_("Paint"))
        hlay.addWidget(self.paint_button)

        self.layout.addStretch()

        # Signals
        self.paint_button.clicked.connect(self.on_paint)

        self.set_tool_ui()

    def run(self):
        self.app.report_usage("Geo Editor ToolPaint()")
        FlatCAMTool.run(self)

        # if the splitter us hidden, display it
        if self.app.ui.splitter.sizes()[0] == 0:
            self.app.ui.splitter.setSizes([1, 1])

        self.app.ui.notebook.setTabText(2, _("Paint Tool"))

    def set_tool_ui(self):
        # Init GUI
        if self.app.defaults["tools_painttooldia"]:
            self.painttooldia_entry.set_value(self.app.defaults["tools_painttooldia"])
        else:
            self.painttooldia_entry.set_value(0.0)

        if self.app.defaults["tools_paintoverlap"]:
            self.paintoverlap_entry.set_value(self.app.defaults["tools_paintoverlap"])
        else:
            self.paintoverlap_entry.set_value(0.0)

        if self.app.defaults["tools_paintmargin"]:
            self.paintmargin_entry.set_value(self.app.defaults["tools_paintmargin"])
        else:
            self.paintmargin_entry.set_value(0.0)

        if self.app.defaults["tools_paintmethod"]:
            self.paintmethod_combo.set_value(self.app.defaults["tools_paintmethod"])
        else:
            self.paintmethod_combo.set_value("seed")

        if self.app.defaults["tools_pathconnect"]:
            self.pathconnect_cb.set_value(self.app.defaults["tools_pathconnect"])
        else:
            self.pathconnect_cb.set_value(False)

        if self.app.defaults["tools_paintcontour"]:
            self.paintcontour_cb.set_value(self.app.defaults["tools_paintcontour"])
        else:
            self.paintcontour_cb.set_value(False)

    def on_paint(self):
        if not self.fcdraw.selected:
            self.app.inform.emit(_("[WARNING_NOTCL] Paint cancelled. No shape selected."))
            return

        try:
            tooldia = float(self.painttooldia_entry.get_value())
        except ValueError:
            # try to convert comma to decimal point. if it's still not working error message and return
            try:
                tooldia = float(self.painttooldia_entry.get_value().replace(',', '.'))
                self.painttooldia_entry.set_value(tooldia)
            except ValueError:
                self.app.inform.emit(_("[WARNING_NOTCL] Tool diameter value is missing or wrong format. "
                                       "Add it and retry."))
                return
        try:
            overlap = float(self.paintoverlap_entry.get_value())
        except ValueError:
            # try to convert comma to decimal point. if it's still not working error message and return
            try:
                overlap = float(self.paintoverlap_entry.get_value().replace(',', '.'))
                self.paintoverlap_entry.set_value(overlap)
            except ValueError:
                self.app.inform.emit(_("[WARNING_NOTCL] Overlap value is missing or wrong format. "
                                       "Add it and retry."))
                return

        try:
            margin = float(self.paintmargin_entry.get_value())
        except ValueError:
            # try to convert comma to decimal point. if it's still not working error message and return
            try:
                margin = float(self.paintmargin_entry.get_value().replace(',', '.'))
                self.paintmargin_entry.set_value(margin)
            except ValueError:
                self.app.inform.emit(_("[WARNING_NOTCL] Margin distance value is missing or wrong format. "
                                       "Add it and retry."))
                return
        method = self.paintmethod_combo.get_value()
        contour = self.paintcontour_cb.get_value()
        connect = self.pathconnect_cb.get_value()

        self.fcdraw.paint(tooldia, overlap, margin, connect=connect, contour=contour, method=method)
        self.fcdraw.select_tool("select")
        self.app.ui.notebook.setTabText(2, _("Tools"))
        self.app.ui.notebook.setCurrentWidget(self.app.ui.project_tab)

        self.app.ui.splitter.setSizes([0, 1])


class TransformEditorTool(FlatCAMTool):
    """
    Inputs to specify how to paint the selected polygons.
    """

    toolName = _("Transform Tool")
    rotateName = _("Rotate")
    skewName = _("Skew/Shear")
    scaleName = _("Scale")
    flipName = _("Mirror (Flip)")
    offsetName = _("Offset")

    def __init__(self, app, draw_app):
        FlatCAMTool.__init__(self, app)

        self.app = app
        self.draw_app = draw_app

        self.transform_lay = QtWidgets.QVBoxLayout()
        self.layout.addLayout(self.transform_lay)
        # ## Title
        title_label = QtWidgets.QLabel("%s" % (_('Editor %s') % self.toolName))
        title_label.setStyleSheet("""
                QLabel
                {
                    font-size: 16px;
                    font-weight: bold;
                }
                """)
        self.transform_lay.addWidget(title_label)

        self.empty_label = QtWidgets.QLabel("")
        self.empty_label.setMinimumWidth(50)

        self.empty_label1 = QtWidgets.QLabel("")
        self.empty_label1.setMinimumWidth(70)
        self.empty_label2 = QtWidgets.QLabel("")
        self.empty_label2.setMinimumWidth(70)
        self.empty_label3 = QtWidgets.QLabel("")
        self.empty_label3.setMinimumWidth(70)
        self.empty_label4 = QtWidgets.QLabel("")
        self.empty_label4.setMinimumWidth(70)
        self.transform_lay.addWidget(self.empty_label)

        # Rotate Title
        rotate_title_label = QtWidgets.QLabel("<font size=3><b>%s</b></font>" % self.rotateName)
        self.transform_lay.addWidget(rotate_title_label)

        # Layout
        form_layout = QtWidgets.QFormLayout()
        self.transform_lay.addLayout(form_layout)
        form_child = QtWidgets.QHBoxLayout()

        self.rotate_label = QtWidgets.QLabel(_("Angle:"))
        self.rotate_label.setToolTip(
           _("Angle for Rotation action, in degrees.\n"
             "Float number between -360 and 359.\n"
             "Positive numbers for CW motion.\n"
             "Negative numbers for CCW motion.")
        )
        self.rotate_label.setFixedWidth(50)

        self.rotate_entry = FCEntry()
        # self.rotate_entry.setFixedWidth(60)
        self.rotate_entry.setAlignment(QtCore.Qt.AlignRight | QtCore.Qt.AlignVCenter)

        self.rotate_button = FCButton()
        self.rotate_button.set_value(_("Rotate"))
        self.rotate_button.setToolTip(
            _("Rotate the selected shape(s).\n"
            "The point of reference is the middle of\n"
            "the bounding box for all selected shapes.")
        )
        self.rotate_button.setFixedWidth(60)

        form_child.addWidget(self.rotate_entry)
        form_child.addWidget(self.rotate_button)

        form_layout.addRow(self.rotate_label, form_child)

        self.transform_lay.addWidget(self.empty_label1)

        # Skew Title
        skew_title_label = QtWidgets.QLabel("<font size=3><b>%s</b></font>" % self.skewName)
        self.transform_lay.addWidget(skew_title_label)

        # Form Layout
        form1_layout = QtWidgets.QFormLayout()
        self.transform_lay.addLayout(form1_layout)
        form1_child_1 = QtWidgets.QHBoxLayout()
        form1_child_2 = QtWidgets.QHBoxLayout()

        self.skewx_label = QtWidgets.QLabel(_("Angle X:"))
        self.skewx_label.setToolTip(
          _("Angle for Skew action, in degrees.\n"
            "Float number between -360 and 359.")
        )
        self.skewx_label.setFixedWidth(50)
        self.skewx_entry = FCEntry()
        self.skewx_entry.setAlignment(QtCore.Qt.AlignRight | QtCore.Qt.AlignVCenter)
        # self.skewx_entry.setFixedWidth(60)

        self.skewx_button = FCButton()
        self.skewx_button.set_value(_("Skew X"))
        self.skewx_button.setToolTip(
           _("Skew/shear the selected shape(s).\n"
             "The point of reference is the middle of\n"
             "the bounding box for all selected shapes."))
        self.skewx_button.setFixedWidth(60)

        self.skewy_label = QtWidgets.QLabel(_("Angle Y:"))
        self.skewy_label.setToolTip(
           _("Angle for Skew action, in degrees.\n"
             "Float number between -360 and 359.")
        )
        self.skewy_label.setFixedWidth(50)
        self.skewy_entry = FCEntry()
        self.skewy_entry.setAlignment(QtCore.Qt.AlignRight | QtCore.Qt.AlignVCenter)
        # self.skewy_entry.setFixedWidth(60)

        self.skewy_button = FCButton()
        self.skewy_button.set_value(_("Skew Y"))
        self.skewy_button.setToolTip(
            _("Skew/shear the selected shape(s).\n"
              "The point of reference is the middle of\n"
              "the bounding box for all selected shapes."))
        self.skewy_button.setFixedWidth(60)

        form1_child_1.addWidget(self.skewx_entry)
        form1_child_1.addWidget(self.skewx_button)

        form1_child_2.addWidget(self.skewy_entry)
        form1_child_2.addWidget(self.skewy_button)

        form1_layout.addRow(self.skewx_label, form1_child_1)
        form1_layout.addRow(self.skewy_label, form1_child_2)

        self.transform_lay.addWidget(self.empty_label2)

        # Scale Title
        scale_title_label = QtWidgets.QLabel("<font size=3><b>%s</b></font>" % self.scaleName)
        self.transform_lay.addWidget(scale_title_label)

        # Form Layout
        form2_layout = QtWidgets.QFormLayout()
        self.transform_lay.addLayout(form2_layout)
        form2_child_1 = QtWidgets.QHBoxLayout()
        form2_child_2 = QtWidgets.QHBoxLayout()

        self.scalex_label = QtWidgets.QLabel(_("Factor X:"))
        self.scalex_label.setToolTip(
            _("Factor for Scale action over X axis.")
        )
        self.scalex_label.setFixedWidth(50)
        self.scalex_entry = FCEntry()
        self.scalex_entry.setAlignment(QtCore.Qt.AlignRight | QtCore.Qt.AlignVCenter)
        # self.scalex_entry.setFixedWidth(60)

        self.scalex_button = FCButton()
        self.scalex_button.set_value(_("Scale X"))
        self.scalex_button.setToolTip(
           _("Scale the selected shape(s).\n"
             "The point of reference depends on \n"
             "the Scale reference checkbox state."))
        self.scalex_button.setFixedWidth(60)

        self.scaley_label = QtWidgets.QLabel(_("Factor Y:"))
        self.scaley_label.setToolTip(
            _("Factor for Scale action over Y axis.")
        )
        self.scaley_label.setFixedWidth(50)
        self.scaley_entry = FCEntry()
        self.scaley_entry.setAlignment(QtCore.Qt.AlignRight | QtCore.Qt.AlignVCenter)
        # self.scaley_entry.setFixedWidth(60)

        self.scaley_button = FCButton()
        self.scaley_button.set_value(_("Scale Y"))
        self.scaley_button.setToolTip(
           _("Scale the selected shape(s).\n"
             "The point of reference depends on \n"
             "the Scale reference checkbox state."))
        self.scaley_button.setFixedWidth(60)

        self.scale_link_cb = FCCheckBox()
        self.scale_link_cb.set_value(True)
        self.scale_link_cb.setText(_("Link"))
        self.scale_link_cb.setToolTip(
            _("Scale the selected shape(s)\n"
             "using the Scale Factor X for both axis."))
        self.scale_link_cb.setFixedWidth(50)

        self.scale_zero_ref_cb = FCCheckBox()
        self.scale_zero_ref_cb.set_value(True)
        self.scale_zero_ref_cb.setText(_("Scale Reference"))
        self.scale_zero_ref_cb.setToolTip(
            _("Scale the selected shape(s)\n"
              "using the origin reference when checked,\n"
              "and the center of the biggest bounding box\n"
              "of the selected shapes when unchecked."))

        form2_child_1.addWidget(self.scalex_entry)
        form2_child_1.addWidget(self.scalex_button)

        form2_child_2.addWidget(self.scaley_entry)
        form2_child_2.addWidget(self.scaley_button)

        form2_layout.addRow(self.scalex_label, form2_child_1)
        form2_layout.addRow(self.scaley_label, form2_child_2)
        form2_layout.addRow(self.scale_link_cb, self.scale_zero_ref_cb)
        self.ois_scale = OptionalInputSection(self.scale_link_cb, [self.scaley_entry, self.scaley_button], logic=False)

        self.transform_lay.addWidget(self.empty_label3)

        # Offset Title
        offset_title_label = QtWidgets.QLabel("<font size=3><b>%s</b></font>" % self.offsetName)
        self.transform_lay.addWidget(offset_title_label)

        # Form Layout
        form3_layout = QtWidgets.QFormLayout()
        self.transform_lay.addLayout(form3_layout)
        form3_child_1 = QtWidgets.QHBoxLayout()
        form3_child_2 = QtWidgets.QHBoxLayout()

        self.offx_label = QtWidgets.QLabel(_("Value X:"))
        self.offx_label.setToolTip(
            _("Value for Offset action on X axis.")
        )
        self.offx_label.setFixedWidth(50)
        self.offx_entry = FCEntry()
        self.offx_entry.setAlignment(QtCore.Qt.AlignRight | QtCore.Qt.AlignVCenter)
        # self.offx_entry.setFixedWidth(60)

        self.offx_button = FCButton()
        self.offx_button.set_value(_("Offset X"))
        self.offx_button.setToolTip(
           _("Offset the selected shape(s).\n"
             "The point of reference is the middle of\n"
             "the bounding box for all selected shapes.\n")
        )
        self.offx_button.setFixedWidth(60)

        self.offy_label = QtWidgets.QLabel(_("Value Y:"))
        self.offy_label.setToolTip(
            _("Value for Offset action on Y axis.")
        )
        self.offy_label.setFixedWidth(50)
        self.offy_entry = FCEntry()
        self.offy_entry.setAlignment(QtCore.Qt.AlignRight | QtCore.Qt.AlignVCenter)
        # self.offy_entry.setFixedWidth(60)

        self.offy_button = FCButton()
        self.offy_button.set_value(_("Offset Y"))
        self.offy_button.setToolTip(
            _("Offset the selected shape(s).\n"
              "The point of reference is the middle of\n"
              "the bounding box for all selected shapes.\n")
        )
        self.offy_button.setFixedWidth(60)

        form3_child_1.addWidget(self.offx_entry)
        form3_child_1.addWidget(self.offx_button)

        form3_child_2.addWidget(self.offy_entry)
        form3_child_2.addWidget(self.offy_button)

        form3_layout.addRow(self.offx_label, form3_child_1)
        form3_layout.addRow(self.offy_label, form3_child_2)

        self.transform_lay.addWidget(self.empty_label4)

        # Flip Title
        flip_title_label = QtWidgets.QLabel("<font size=3><b>%s</b></font>" % self.flipName)
        self.transform_lay.addWidget(flip_title_label)

        # Form Layout
        form4_layout = QtWidgets.QFormLayout()
        form4_child_hlay = QtWidgets.QHBoxLayout()
        self.transform_lay.addLayout(form4_child_hlay)
        self.transform_lay.addLayout(form4_layout)
        form4_child_1 = QtWidgets.QHBoxLayout()

        self.flipx_button = FCButton()
        self.flipx_button.set_value(_("Flip on X"))
        self.flipx_button.setToolTip(
            _("Flip the selected shape(s) over the X axis.\n"
              "Does not create a new shape.")
        )
        self.flipx_button.setFixedWidth(60)

        self.flipy_button = FCButton()
        self.flipy_button.set_value(_("Flip on Y"))
        self.flipy_button.setToolTip(
            _("Flip the selected shape(s) over the X axis.\n"
              "Does not create a new shape.")
        )
        self.flipy_button.setFixedWidth(60)

        self.flip_ref_cb = FCCheckBox()
        self.flip_ref_cb.set_value(True)
        self.flip_ref_cb.setText(_("Ref Pt"))
        self.flip_ref_cb.setToolTip(
            _("Flip the selected shape(s)\n"
              "around the point in Point Entry Field.\n"
              "\n"
              "The point coordinates can be captured by\n"
              "left click on canvas together with pressing\n"
              "SHIFT key. \n"
              "Then click Add button to insert coordinates.\n"
              "Or enter the coords in format (x, y) in the\n"
              "Point Entry field and click Flip on X(Y)")
        )
        self.flip_ref_cb.setFixedWidth(50)

        self.flip_ref_label = QtWidgets.QLabel(_("Point:"))
        self.flip_ref_label.setToolTip(
            _("Coordinates in format (x, y) used as reference for mirroring.\n"
              "The 'x' in (x, y) will be used when using Flip on X and\n"
              "the 'y' in (x, y) will be used when using Flip on Y.")
        )
        self.flip_ref_label.setFixedWidth(50)
        self.flip_ref_entry = EvalEntry2("(0, 0)")
        self.flip_ref_entry.setAlignment(QtCore.Qt.AlignRight | QtCore.Qt.AlignVCenter)
        # self.flip_ref_entry.setFixedWidth(60)

        self.flip_ref_button = FCButton()
        self.flip_ref_button.set_value(_("Add"))
        self.flip_ref_button.setToolTip(
           _("The point coordinates can be captured by\n"
             "left click on canvas together with pressing\n"
             "SHIFT key. Then click Add button to insert.")
           )
        self.flip_ref_button.setFixedWidth(60)

        form4_child_hlay.addStretch()
        form4_child_hlay.addWidget(self.flipx_button)
        form4_child_hlay.addWidget(self.flipy_button)

        form4_child_1.addWidget(self.flip_ref_entry)
        form4_child_1.addWidget(self.flip_ref_button)

        form4_layout.addRow(self.flip_ref_cb)
        form4_layout.addRow(self.flip_ref_label, form4_child_1)
        self.ois_flip = OptionalInputSection(self.flip_ref_cb,
                                             [self.flip_ref_entry, self.flip_ref_button], logic=True)

        self.transform_lay.addStretch()

        # Signals
        self.rotate_button.clicked.connect(self.on_rotate)
        self.skewx_button.clicked.connect(self.on_skewx)
        self.skewy_button.clicked.connect(self.on_skewy)
        self.scalex_button.clicked.connect(self.on_scalex)
        self.scaley_button.clicked.connect(self.on_scaley)
        self.offx_button.clicked.connect(self.on_offx)
        self.offy_button.clicked.connect(self.on_offy)
        self.flipx_button.clicked.connect(self.on_flipx)
        self.flipy_button.clicked.connect(self.on_flipy)
        self.flip_ref_button.clicked.connect(self.on_flip_add_coords)

        self.rotate_entry.returnPressed.connect(self.on_rotate)
        self.skewx_entry.returnPressed.connect(self.on_skewx)
        self.skewy_entry.returnPressed.connect(self.on_skewy)
        self.scalex_entry.returnPressed.connect(self.on_scalex)
        self.scaley_entry.returnPressed.connect(self.on_scaley)
        self.offx_entry.returnPressed.connect(self.on_offx)
        self.offy_entry.returnPressed.connect(self.on_offy)

        self.set_tool_ui()

    def run(self):
        self.app.report_usage("Geo Editor Transform Tool()")
        FlatCAMTool.run(self)
        self.set_tool_ui()

        # if the splitter us hidden, display it
        if self.app.ui.splitter.sizes()[0] == 0:
            self.app.ui.splitter.setSizes([1, 1])

        self.app.ui.notebook.setTabText(2, _("Transform Tool"))

    def install(self, icon=None, separator=None, **kwargs):
        FlatCAMTool.install(self, icon, separator, shortcut='ALT+T', **kwargs)

    def set_tool_ui(self):
        # Initialize form
        if self.app.defaults["tools_transform_rotate"]:
            self.rotate_entry.set_value(self.app.defaults["tools_transform_rotate"])
        else:
            self.rotate_entry.set_value(0.0)

        if self.app.defaults["tools_transform_skew_x"]:
            self.skewx_entry.set_value(self.app.defaults["tools_transform_skew_x"])
        else:
            self.skewx_entry.set_value(0.0)

        if self.app.defaults["tools_transform_skew_y"]:
            self.skewy_entry.set_value(self.app.defaults["tools_transform_skew_y"])
        else:
            self.skewy_entry.set_value(0.0)

        if self.app.defaults["tools_transform_scale_x"]:
            self.scalex_entry.set_value(self.app.defaults["tools_transform_scale_x"])
        else:
            self.scalex_entry.set_value(1.0)

        if self.app.defaults["tools_transform_scale_y"]:
            self.scaley_entry.set_value(self.app.defaults["tools_transform_scale_y"])
        else:
            self.scaley_entry.set_value(1.0)

        if self.app.defaults["tools_transform_scale_link"]:
            self.scale_link_cb.set_value(self.app.defaults["tools_transform_scale_link"])
        else:
            self.scale_link_cb.set_value(True)

        if self.app.defaults["tools_transform_scale_reference"]:
            self.scale_zero_ref_cb.set_value(self.app.defaults["tools_transform_scale_reference"])
        else:
            self.scale_zero_ref_cb.set_value(True)

        if self.app.defaults["tools_transform_offset_x"]:
            self.offx_entry.set_value(self.app.defaults["tools_transform_offset_x"])
        else:
            self.offx_entry.set_value(0.0)

        if self.app.defaults["tools_transform_offset_y"]:
            self.offy_entry.set_value(self.app.defaults["tools_transform_offset_y"])
        else:
            self.offy_entry.set_value(0.0)

        if self.app.defaults["tools_transform_mirror_reference"]:
            self.flip_ref_cb.set_value(self.app.defaults["tools_transform_mirror_reference"])
        else:
            self.flip_ref_cb.set_value(False)

        if self.app.defaults["tools_transform_mirror_point"]:
            self.flip_ref_entry.set_value(self.app.defaults["tools_transform_mirror_point"])
        else:
            self.flip_ref_entry.set_value((0, 0))

    def template(self):
        if not self.fcdraw.selected:
            self.app.inform.emit(_("[WARNING_NOTCL] Transformation cancelled. No shape selected."))
            return


        self.draw_app.select_tool("select")
        self.app.ui.notebook.setTabText(2, "Tools")
        self.app.ui.notebook.setCurrentWidget(self.app.ui.project_tab)

        self.app.ui.splitter.setSizes([0, 1])

    def on_rotate(self, sig=None, val=None):
        if val:
            value = val
        else:
            try:
                value = float(self.rotate_entry.get_value())
            except ValueError:
                # try to convert comma to decimal point. if it's still not working error message and return
                try:
                    value = float(self.rotate_entry.get_value().replace(',', '.'))
                except ValueError:
                    self.app.inform.emit(_("[ERROR_NOTCL] Wrong value format entered for Rotate, "
                                         "use a number."))
                    return
        self.app.worker_task.emit({'fcn': self.on_rotate_action,
                                       'params': [value]})
        # self.on_rotate_action(value)
        return

    def on_flipx(self):
        # self.on_flip("Y")
        axis = 'Y'
        self.app.worker_task.emit({'fcn': self.on_flip,
                                   'params': [axis]})
        return

    def on_flipy(self):
        # self.on_flip("X")
        axis = 'X'
        self.app.worker_task.emit({'fcn': self.on_flip,
                                   'params': [axis]})
        return

    def on_flip_add_coords(self):
        val = self.app.clipboard.text()
        self.flip_ref_entry.set_value(val)

    def on_skewx(self, sig=None, val=None):
        if val:
            value = val
        else:
            try:
                value = float(self.skewx_entry.get_value())
            except ValueError:
                # try to convert comma to decimal point. if it's still not working error message and return
                try:
                    value = float(self.skewx_entry.get_value().replace(',', '.'))
                except ValueError:
                    self.app.inform.emit(_("[ERROR_NOTCL] Wrong value format entered for Skew X, "
                                           "use a number."))
                    return

        # self.on_skew("X", value)
        axis = 'X'
        self.app.worker_task.emit({'fcn': self.on_skew,
                                   'params': [axis, value]})
        return

    def on_skewy(self, sig=None, val=None):
        if val:
            value = val
        else:
            try:
                value = float(self.skewy_entry.get_value())
            except ValueError:
                # try to convert comma to decimal point. if it's still not working error message and return
                try:
                    value = float(self.skewy_entry.get_value().replace(',', '.'))
                except ValueError:
                    self.app.inform.emit(_("[ERROR_NOTCL] Wrong value format entered for Skew Y, "
                                           "use a number."))
                    return

        # self.on_skew("Y", value)
        axis = 'Y'
        self.app.worker_task.emit({'fcn': self.on_skew,
                                   'params': [axis, value]})
        return

    def on_scalex(self, sig=None, val=None):
        if val:
            xvalue = val
        else:
            try:
                xvalue = float(self.scalex_entry.get_value())
            except ValueError:
                # try to convert comma to decimal point. if it's still not working error message and return
                try:
                    xvalue = float(self.scalex_entry.get_value().replace(',', '.'))
                except ValueError:
                    self.app.inform.emit(_("[ERROR_NOTCL] Wrong value format entered for Scale X, "
                                           "use a number."))
                    return

        # scaling to zero has no sense so we remove it, because scaling with 1 does nothing
        if xvalue == 0:
            xvalue = 1
        if self.scale_link_cb.get_value():
            yvalue = xvalue
        else:
            yvalue = 1

        axis = 'X'
        point = (0, 0)
        if self.scale_zero_ref_cb.get_value():
            self.app.worker_task.emit({'fcn': self.on_scale,
                                       'params': [axis, xvalue, yvalue, point]})
            # self.on_scale("X", xvalue, yvalue, point=(0,0))
        else:
            # self.on_scale("X", xvalue, yvalue)
            self.app.worker_task.emit({'fcn': self.on_scale,
                                       'params': [axis, xvalue, yvalue]})

        return

    def on_scaley(self, sig=None, val=None):
        xvalue = 1
        if val:
            yvalue = val
        else:
            try:
                yvalue = float(self.scaley_entry.get_value())
            except ValueError:
                # try to convert comma to decimal point. if it's still not working error message and return
                try:
                    yvalue = float(self.scaley_entry.get_value().replace(',', '.'))
                except ValueError:
                    self.app.inform.emit(_("[ERROR_NOTCL] Wrong value format entered for Scale Y, "
                                           "use a number."))
                    return

        # scaling to zero has no sense so we remove it, because scaling with 1 does nothing
        if yvalue == 0:
            yvalue = 1

        axis = 'Y'
        point = (0, 0)
        if self.scale_zero_ref_cb.get_value():
            self.app.worker_task.emit({'fcn': self.on_scale,
                                       'params': [axis, xvalue, yvalue, point]})
            # self.on_scale("Y", xvalue, yvalue, point=(0,0))
        else:
            # self.on_scale("Y", xvalue, yvalue)
            self.app.worker_task.emit({'fcn': self.on_scale,
                                       'params': [axis, xvalue, yvalue]})

        return

    def on_offx(self, sig=None, val=None):
        if val:
            value = val
        else:
            try:
                value = float(self.offx_entry.get_value())
            except ValueError:
                # try to convert comma to decimal point. if it's still not working error message and return
                try:
                    value = float(self.offx_entry.get_value().replace(',', '.'))
                except ValueError:
                    self.app.inform.emit(_("[ERROR_NOTCL] Wrong value format entered for Offset X, "
                                           "use a number."))
                    return

        # self.on_offset("X", value)
        axis = 'X'
        self.app.worker_task.emit({'fcn': self.on_offset,
                                   'params': [axis, value]})
        return

    def on_offy(self, sig=None, val=None):
        if val:
            value = val
        else:
            try:
                value = float(self.offy_entry.get_value())
            except ValueError:
                # try to convert comma to decimal point. if it's still not working error message and return
                try:
                    value = float(self.offy_entry.get_value().replace(',', '.'))
                except ValueError:
                    self.app.inform.emit(_("[ERROR_NOTCL] Wrong value format entered for Offset Y, "
                                           "use a number."))
                    return

        # self.on_offset("Y", value)
        axis = 'Y'
        self.app.worker_task.emit({'fcn': self.on_offset,
                                   'params': [axis, value]})
        return

    def on_rotate_action(self, num):
        shape_list = self.draw_app.selected
        xminlist = []
        yminlist = []
        xmaxlist = []
        ymaxlist = []

        if not shape_list:
            self.app.inform.emit(_("[WARNING_NOTCL] No shape selected. Please Select a shape to rotate!"))
            return
        else:
            with self.app.proc_container.new(_("Appying Rotate")):
                try:
                    # first get a bounding box to fit all
                    for sha in shape_list:
                        xmin, ymin, xmax, ymax = sha.bounds()
                        xminlist.append(xmin)
                        yminlist.append(ymin)
                        xmaxlist.append(xmax)
                        ymaxlist.append(ymax)

                    # get the minimum x,y and maximum x,y for all objects selected
                    xminimal = min(xminlist)
                    yminimal = min(yminlist)
                    xmaximal = max(xmaxlist)
                    ymaximal = max(ymaxlist)

                    self.app.progress.emit(20)

                    for sel_sha in shape_list:
                        px = 0.5 * (xminimal + xmaximal)
                        py = 0.5 * (yminimal + ymaximal)

                        sel_sha.rotate(-num, point=(px, py))
                        self.draw_app.replot()
                        # self.draw_app.add_shape(DrawToolShape(sel_sha.geo))

                    # self.draw_app.transform_complete.emit()

                    self.app.inform.emit(_("[success] Done. Rotate completed."))

                    self.app.progress.emit(100)

                except Exception as e:
                    self.app.inform.emit(_("[ERROR_NOTCL] Due of %s, rotation movement was not executed.") % str(e))
                    return

    def on_flip(self, axis):
        shape_list = self.draw_app.selected
        xminlist = []
        yminlist = []
        xmaxlist = []
        ymaxlist = []

        if not shape_list:
            self.app.inform.emit(_("[WARNING_NOTCL] No shape selected. Please Select a shape to flip!"))
            return
        else:
            with self.app.proc_container.new(_("Applying Flip")):
                try:
                    # get mirroring coords from the point entry
                    if self.flip_ref_cb.isChecked():
                        px, py = eval('{}'.format(self.flip_ref_entry.text()))
                    # get mirroing coords from the center of an all-enclosing bounding box
                    else:
                        # first get a bounding box to fit all
                        for sha in shape_list:
                            xmin, ymin, xmax, ymax = sha.bounds()
                            xminlist.append(xmin)
                            yminlist.append(ymin)
                            xmaxlist.append(xmax)
                            ymaxlist.append(ymax)

                        # get the minimum x,y and maximum x,y for all objects selected
                        xminimal = min(xminlist)
                        yminimal = min(yminlist)
                        xmaximal = max(xmaxlist)
                        ymaximal = max(ymaxlist)

                        px = 0.5 * (xminimal + xmaximal)
                        py = 0.5 * (yminimal + ymaximal)

                    self.app.progress.emit(20)

                    # execute mirroring
                    for sha in shape_list:
                        if axis is 'X':
                            sha.mirror('X', (px, py))
                            self.app.inform.emit(_('[success] Flip on the Y axis done ...'))
                        elif axis is 'Y':
                            sha.mirror('Y', (px, py))
                            self.app.inform.emit(_('[success] Flip on the X axis done ...'))
                        self.draw_app.replot()

                    #     self.draw_app.add_shape(DrawToolShape(sha.geo))
                    #
                    # self.draw_app.transform_complete.emit()

                    self.app.progress.emit(100)

                except Exception as e:
                    self.app.inform.emit(_("[ERROR_NOTCL] Due of %s, Flip action was not executed.") % str(e))
                    return

    def on_skew(self, axis, num):
        shape_list = self.draw_app.selected
        xminlist = []
        yminlist = []

        if not shape_list:
            self.app.inform.emit(_("[WARNING_NOTCL] No shape selected. Please Select a shape to shear/skew!"))
            return
        else:
            with self.app.proc_container.new(_("Applying Skew")):
                try:
                    # first get a bounding box to fit all
                    for sha in shape_list:
                        xmin, ymin, xmax, ymax = sha.bounds()
                        xminlist.append(xmin)
                        yminlist.append(ymin)

                    # get the minimum x,y and maximum x,y for all objects selected
                    xminimal = min(xminlist)
                    yminimal = min(yminlist)

                    self.app.progress.emit(20)

                    for sha in shape_list:
                        if axis is 'X':
                            sha.skew(num, 0, point=(xminimal, yminimal))
                        elif axis is 'Y':
                            sha.skew(0, num, point=(xminimal, yminimal))
                        self.draw_app.replot()

                    #     self.draw_app.add_shape(DrawToolShape(sha.geo))
                    #
                    # self.draw_app.transform_complete.emit()

                    self.app.inform.emit(_('[success] Skew on the %s axis done ...') % str(axis))
                    self.app.progress.emit(100)

                except Exception as e:
                    self.app.inform.emit(_("[ERROR_NOTCL] Due of %s, Skew action was not executed.") % str(e))
                    return

    def on_scale(self, axis, xfactor, yfactor, point=None):
        shape_list = self.draw_app.selected
        xminlist = []
        yminlist = []
        xmaxlist = []
        ymaxlist = []

        if not shape_list:
            self.app.inform.emit(_("[WARNING_NOTCL] No shape selected. Please Select a shape to scale!"))
            return
        else:
            with self.app.proc_container.new(_("Applying Scale")):
                try:
                    # first get a bounding box to fit all
                    for sha in shape_list:
                        xmin, ymin, xmax, ymax = sha.bounds()
                        xminlist.append(xmin)
                        yminlist.append(ymin)
                        xmaxlist.append(xmax)
                        ymaxlist.append(ymax)

                    # get the minimum x,y and maximum x,y for all objects selected
                    xminimal = min(xminlist)
                    yminimal = min(yminlist)
                    xmaximal = max(xmaxlist)
                    ymaximal = max(ymaxlist)

                    self.app.progress.emit(20)

                    if point is None:
                        px = 0.5 * (xminimal + xmaximal)
                        py = 0.5 * (yminimal + ymaximal)
                    else:
                        px = 0
                        py = 0

                    for sha in shape_list:
                        sha.scale(xfactor, yfactor, point=(px, py))
                        self.draw_app.replot()

                    #     self.draw_app.add_shape(DrawToolShape(sha.geo))
                    #
                    # self.draw_app.transform_complete.emit()

                    self.app.inform.emit(_('[success] Scale on the %s axis done ...') % str(axis))
                    self.app.progress.emit(100)
                except Exception as e:
                    self.app.inform.emit(_("[ERROR_NOTCL] Due of %s, Scale action was not executed.") % str(e))
                    return

    def on_offset(self, axis, num):
        shape_list = self.draw_app.selected
        xminlist = []
        yminlist = []

        if not shape_list:
            self.app.inform.emit(_("[WARNING_NOTCL] No shape selected. Please Select a shape to offset!"))
            return
        else:
            with self.app.proc_container.new(_("Applying Offset")):
                try:
                    self.app.progress.emit(20)

                    for sha in shape_list:
                        if axis is 'X':
                            sha.offset((num, 0))
                        elif axis is 'Y':
                            sha.offset((0, num))
                        self.draw_app.replot()

                    self.app.inform.emit(_('[success] Offset on the %s axis done ...') % str(axis))
                    self.app.progress.emit(100)

                except Exception as e:
                    self.app.inform.emit(_("[ERROR_NOTCL] Due of %s, Offset action was not executed.") % str(e))
                    return

    def on_rotate_key(self):
        val_box = FCInputDialog(title=_("Rotate ..."),
                                text=_('Enter an Angle Value (degrees):'),
                                min=-359.9999, max=360.0000, decimals=4,
                                init_val=float(self.app.defaults['tools_transform_rotate']))
        val_box.setWindowIcon(QtGui.QIcon('share/rotate.png'))

        val, ok = val_box.get_value()
        if ok:
            self.on_rotate(val=val)
            self.app.inform.emit(
                _("[success] Geometry shape rotate done...")
                )
            return
        else:
            self.app.inform.emit(
                _("[WARNING_NOTCL] Geometry shape rotate cancelled...")
                )

    def on_offx_key(self):
        units = self.app.ui.general_defaults_form.general_app_group.units_radio.get_value().lower()

        val_box = FCInputDialog(title=_("Offset on X axis ..."),
                                text=(_('Enter a distance Value (%s):') % str(units)),
                                min=-9999.9999, max=10000.0000, decimals=4,
                                init_val=float(self.app.defaults['tools_transform_offset_x']))
        val_box.setWindowIcon(QtGui.QIcon('share/offsetx32.png'))

        val, ok = val_box.get_value()
        if ok:
            self.on_offx(val=val)
            self.app.inform.emit(
                _("[success] Geometry shape offset on X axis done..."))
            return
        else:
            self.app.inform.emit(
                _("[WARNING_NOTCL] Geometry shape offset X cancelled..."))

    def on_offy_key(self):
        units = self.app.ui.general_defaults_form.general_app_group.units_radio.get_value().lower()

        val_box = FCInputDialog(title=_("Offset on Y axis ..."),
                                text=(_('Enter a distance Value (%s):') % str(units)),
                                min=-9999.9999, max=10000.0000, decimals=4,
                                init_val=float(self.app.defaults['tools_transform_offset_y']))
        val_box.setWindowIcon(QtGui.QIcon('share/offsety32.png'))

        val, ok = val_box.get_value()
        if ok:
            self.on_offx(val=val)
            self.app.inform.emit(
                _("[success] Geometry shape offset on Y axis done..."))
            return
        else:
            self.app.inform.emit(
                _("[WARNING_NOTCL] Geometry shape offset Y cancelled..."))

    def on_skewx_key(self):
        val_box = FCInputDialog(title=_("Skew on X axis ..."),
                                text=_('Enter an Angle Value (degrees):'),
                                min=-359.9999, max=360.0000, decimals=4,
                                init_val=float(self.app.defaults['tools_transform_skew_x']))
        val_box.setWindowIcon(QtGui.QIcon('share/skewX.png'))

        val, ok = val_box.get_value()
        if ok:
            self.on_skewx(val=val)
            self.app.inform.emit(
                _("[success] Geometry shape skew on X axis done..."))
            return
        else:
            self.app.inform.emit(
               _("[WARNING_NOTCL] Geometry shape skew X cancelled..."))

    def on_skewy_key(self):
        val_box = FCInputDialog(title=_("Skew on Y axis ..."),
                                text=_('Enter an Angle Value (degrees):'),
                                min=-359.9999, max=360.0000, decimals=4,
                                init_val=float(self.app.defaults['tools_transform_skew_y']))
        val_box.setWindowIcon(QtGui.QIcon('share/skewY.png'))

        val, ok = val_box.get_value()
        if ok:
            self.on_skewx(val=val)
            self.app.inform.emit(
               _("[success] Geometry shape skew on Y axis done..."))
            return
        else:
            self.app.inform.emit(
                _("[WARNING_NOTCL] Geometry shape skew Y cancelled..."))


class DrawToolShape(object):
    """
    Encapsulates "shapes" under a common class.
    """

    tolerance = None

    @staticmethod
    def get_pts(o):
        """
        Returns a list of all points in the object, where
        the object can be a Polygon, Not a polygon, or a list
        of such. Search is done recursively.

        :param: geometric object
        :return: List of points
        :rtype: list
        """
        pts = []

        # Iterable: descend into each item.
        try:
            for subo in o:
                pts += DrawToolShape.get_pts(subo)

        # Non-iterable
        except TypeError:
            if o is not None:
                # DrawToolShape: descend into .geo.
                if isinstance(o, DrawToolShape):
                    pts += DrawToolShape.get_pts(o.geo)

                # Descend into .exerior and .interiors
                elif type(o) == Polygon:
                    pts += DrawToolShape.get_pts(o.exterior)
                    for i in o.interiors:
                        pts += DrawToolShape.get_pts(i)
                elif type(o) == MultiLineString:
                    for line in o:
                        pts += DrawToolShape.get_pts(line)
                # Has .coords: list them.
                else:
                    if DrawToolShape.tolerance is not None:
                        pts += list(o.simplify(DrawToolShape.tolerance).coords)
                    else:
                        pts += list(o.coords)
            else:
                return
        return pts

    def __init__(self, geo=[]):

        # Shapely type or list of such
        self.geo = geo
        self.utility = False

    def get_all_points(self):
        return DrawToolShape.get_pts(self)

    def bounds(self):
        """
                Returns coordinates of rectangular bounds
                of geometry: (xmin, ymin, xmax, ymax).
                """
        # fixed issue of getting bounds only for one level lists of objects
        # now it can get bounds for nested lists of objects
        def bounds_rec(shape_el):
            if type(shape_el) is list:
                minx = Inf
                miny = Inf
                maxx = -Inf
                maxy = -Inf

                for k in shape_el:
                    minx_, miny_, maxx_, maxy_ = bounds_rec(k)
                    minx = min(minx, minx_)
                    miny = min(miny, miny_)
                    maxx = max(maxx, maxx_)
                    maxy = max(maxy, maxy_)
                return minx, miny, maxx, maxy
            else:
                # it's a Shapely object, return it's bounds
                return shape_el.bounds

        bounds_coords = bounds_rec(self.geo)
        return bounds_coords

    def mirror(self, axis, point):
        """
        Mirrors the shape around a specified axis passing through
        the given point.

        :param axis: "X" or "Y" indicates around which axis to mirror.
        :type axis: str
        :param point: [x, y] point belonging to the mirror axis.
        :type point: list
        :return: None
        """

        px, py = point
        xscale, yscale = {"X": (1.0, -1.0), "Y": (-1.0, 1.0)}[axis]

        def mirror_geom(shape_el):
            if type(shape_el) is list:
                new_obj = []
                for g in shape_el:
                    new_obj.append(mirror_geom(g))
                return new_obj
            else:
                return affinity.scale(shape_el, xscale, yscale, origin=(px, py))

        try:
            self.geo = mirror_geom(self.geo)
        except AttributeError:
            log.debug("DrawToolShape.mirror() --> Failed to mirror. No shape selected")

    def rotate(self, angle, point):
        """
        Rotate a shape by an angle (in degrees) around the provided coordinates.

        Parameters
        ----------
        The angle of rotation are specified in degrees (default). Positive angles are
        counter-clockwise and negative are clockwise rotations.

        The point of origin can be a keyword 'center' for the bounding box
        center (default), 'centroid' for the geometry's centroid, a Point object
        or a coordinate tuple (x0, y0).

        See shapely manual for more information:
        http://toblerity.org/shapely/manual.html#affine-transformations
        """

        px, py = point

        def rotate_geom(shape_el):
            if type(shape_el) is list:
                new_obj = []
                for g in shape_el:
                    new_obj.append(rotate_geom(g))
                return new_obj
            else:
                return affinity.rotate(shape_el, angle, origin=(px, py))

        try:
            self.geo = rotate_geom(self.geo)
        except AttributeError:
            log.debug("DrawToolShape.rotate() --> Failed to rotate. No shape selected")

    def skew(self, angle_x, angle_y, point):
        """
        Shear/Skew a shape by angles along x and y dimensions.

        Parameters
        ----------
        angle_x, angle_y : float, float
            The shear angle(s) for the x and y axes respectively. These can be
            specified in either degrees (default) or radians by setting
            use_radians=True.
        point: tuple of coordinates (x,y)

        See shapely manual for more information:
        http://toblerity.org/shapely/manual.html#affine-transformations
        """
        px, py = point

        def skew_geom(shape_el):
            if type(shape_el) is list:
                new_obj = []
                for g in shape_el:
                    new_obj.append(skew_geom(g))
                return new_obj
            else:
                return affinity.skew(shape_el, angle_x, angle_y, origin=(px, py))

        try:
            self.geo = skew_geom(self.geo)
        except AttributeError:
            log.debug("DrawToolShape.skew() --> Failed to skew. No shape selected")

    def offset(self, vect):
        """
        Offsets all shapes by a given vector/

        :param vect: (x, y) vector by which to offset the shape geometry
        :type vect: tuple
        :return: None
        :rtype: None
        """

        try:
            dx, dy = vect
        except TypeError:
            log.debug("DrawToolShape.offset() --> An (x,y) pair of values are needed. "
                      "Probable you entered only one value in the Offset field.")
            return

        def translate_recursion(geom):
            if type(geom) == list:
                geoms = list()
                for local_geom in geom:
                    geoms.append(translate_recursion(local_geom))
                return geoms
            else:
                return affinity.translate(geom, xoff=dx, yoff=dy)

        try:
            self.geo = translate_recursion(self.geo)
        except AttributeError:
            log.debug("DrawToolShape.offset() --> Failed to offset. No shape selected")

    def scale(self, xfactor, yfactor=None, point=None):
        """
        Scales all shape geometry by a given factor.

        :param xfactor: Factor by which to scale the shape's geometry/
        :type xfactor: float
        :param yfactor: Factor by which to scale the shape's geometry/
        :type yfactor: float
        :return: None
        :rtype: None
        """

        try:
            xfactor = float(xfactor)
        except:
            log.debug("DrawToolShape.offset() --> Scale factor has to be a number: integer or float.")
            return

        if yfactor is None:
            yfactor = xfactor
        else:
            try:
                yfactor = float(yfactor)
            except:
                log.debug("DrawToolShape.offset() --> Scale factor has to be a number: integer or float.")
                return

        if point is None:
            px = 0
            py = 0
        else:
            px, py = point

        def scale_recursion(geom):
            if type(geom) == list:
                geoms = list()
                for local_geom in geom:
                    geoms.append(scale_recursion(local_geom))
                return geoms
            else:
                return  affinity.scale(geom, xfactor, yfactor, origin=(px, py))

        try:
            self.geo = scale_recursion(self.geo)
        except AttributeError:
            log.debug("DrawToolShape.scale() --> Failed to scale. No shape selected")


class DrawToolUtilityShape(DrawToolShape):
    """
    Utility shapes are temporary geometry in the editor
    to assist in the creation of shapes. For example it
    will show the outline of a rectangle from the first
    point to the current mouse pointer before the second
    point is clicked and the final geometry is created.
    """

    def __init__(self, geo=[]):
        super(DrawToolUtilityShape, self).__init__(geo=geo)
        self.utility = True


class DrawTool(object):
    """
    Abstract Class representing a tool in the drawing
    program. Can generate geometry, including temporary
    utility geometry that is updated on user clicks
    and mouse motion.
    """

    def __init__(self, draw_app):
        self.draw_app = draw_app
        self.complete = False
        self.points = []
        self.geometry = None  # DrawToolShape or None

    def click(self, point):
        """
        :param point: [x, y] Coordinate pair.
        """
        return ""

    def click_release(self, point):
        """
        :param point: [x, y] Coordinate pair.
        """
        return ""

    def on_key(self, key):
        return None

    def utility_geometry(self, data=None):
        return None

    def bounds(self, obj):
        def bounds_rec(o):
            if type(o) is list:
                minx = Inf
                miny = Inf
                maxx = -Inf
                maxy = -Inf

                for k in o:
                    try:
                        minx_, miny_, maxx_, maxy_ = bounds_rec(k)
                    except Exception as e:
                        log.debug("camlib.Gerber.bounds() --> %s" % str(e))
                        return

                    minx = min(minx, minx_)
                    miny = min(miny, miny_)
                    maxx = max(maxx, maxx_)
                    maxy = max(maxy, maxy_)
                return minx, miny, maxx, maxy
            else:
                # it's a Shapely object, return it's bounds
                return o.geo.bounds

        bounds_coords = bounds_rec(obj)
        return bounds_coords


class FCShapeTool(DrawTool):
    """
    Abstract class for tools that create a shape.
    """

    def __init__(self, draw_app):
        DrawTool.__init__(self, draw_app)

    def make(self):
        pass


class FCCircle(FCShapeTool):
    """
    Resulting type: Polygon
    """

    def __init__(self, draw_app):
        DrawTool.__init__(self, draw_app)
        self.name = 'circle'

        try:
            QtGui.QGuiApplication.restoreOverrideCursor()
        except Exception as e:
            pass
        self.cursor = QtGui.QCursor(QtGui.QPixmap('share/aero_circle_geo.png'))
        QtGui.QGuiApplication.setOverrideCursor(self.cursor)

        self.draw_app.app.inform.emit(_("Click on Center point ..."))
        self.steps_per_circ = self.draw_app.app.defaults["geometry_circle_steps"]

    def click(self, point):
        self.points.append(point)

        if len(self.points) == 1:
            self.draw_app.app.inform.emit(_("Click on Perimeter point to complete ..."))
            return "Click on perimeter to complete ..."

        if len(self.points) == 2:
            self.make()
            return "Done."

        return ""

    def utility_geometry(self, data=None):
        if len(self.points) == 1:
            p1 = self.points[0]
            p2 = data
            radius = sqrt((p1[0] - p2[0]) ** 2 + (p1[1] - p2[1]) ** 2)
            return DrawToolUtilityShape(Point(p1).buffer(radius, int(self.steps_per_circ / 4)))

        return None

    def make(self):
        try:
            QtGui.QGuiApplication.restoreOverrideCursor()
        except Exception as e:
            pass

        p1 = self.points[0]
        p2 = self.points[1]
        radius = distance(p1, p2)
        self.geometry = DrawToolShape(Point(p1).buffer(radius, int(self.steps_per_circ / 4)))
        self.complete = True
        self.draw_app.app.inform.emit(_("[success] Done. Adding Circle completed."))


class FCArc(FCShapeTool):
    def __init__(self, draw_app):
        DrawTool.__init__(self, draw_app)
        self.name = 'arc'

        try:
            QtGui.QGuiApplication.restoreOverrideCursor()
        except Exception as e:
            pass
        self.cursor = QtGui.QCursor(QtGui.QPixmap('share/aero_arc.png'))
        QtGui.QGuiApplication.setOverrideCursor(self.cursor)

        self.draw_app.app.inform.emit(_("Click on Center point ..."))

        # Direction of rotation between point 1 and 2.
        # 'cw' or 'ccw'. Switch direction by hitting the
        # 'o' key.
        self.direction = "cw"

        # Mode
        # C12 = Center, p1, p2
        # 12C = p1, p2, Center
        # 132 = p1, p3, p2
        self.mode = "c12"  # Center, p1, p2

        self.steps_per_circ = self.draw_app.app.defaults["geometry_circle_steps"]

    def click(self, point):
        self.points.append(point)

        if len(self.points) == 1:
            if self.mode == 'c12':
                self.draw_app.app.inform.emit(_("Click on Start point ..."))
            elif self.mode == '132':
                self.draw_app.app.inform.emit(_("Click on Point3 ..."))
            else:
                self.draw_app.app.inform.emit(_("Click on Stop point ..."))
            return "Click on 1st point ..."

        if len(self.points) == 2:
            if self.mode == 'c12':
                self.draw_app.app.inform.emit(_("Click on Stop point to complete ..."))
            elif self.mode == '132':
                self.draw_app.app.inform.emit(_("Click on Point2 to complete ..."))
            else:
                self.draw_app.app.inform.emit(_("Click on Center point to complete ..."))
            return "Click on 2nd point to complete ..."

        if len(self.points) == 3:
            self.make()
            return "Done."

        return ""

    def on_key(self, key):
        if key == 'D' or key == QtCore.Qt.Key_D:
            self.direction = 'cw' if self.direction == 'ccw' else 'ccw'
            return _('Direction: %s') % self.direction.upper()

        if key == 'M' or key == QtCore.Qt.Key_M:
            # delete the possible points made before this action; we want to start anew
            self.points[:] = []
            # and delete the utility geometry made up until this point
            self.draw_app.delete_utility_geometry()

            if self.mode == 'c12':
                self.mode = '12c'
                return _('Mode: Start -> Stop -> Center. Click on Start point ...')
            elif self.mode == '12c':
                self.mode = '132'
                return _('Mode: Point1 -> Point3 -> Point2. Click on Point1 ...')
            else:
                self.mode = 'c12'
                return _('Mode: Center -> Start -> Stop. Click on Center point ...')

    def utility_geometry(self, data=None):
        if len(self.points) == 1:  # Show the radius
            center = self.points[0]
            p1 = data

            return DrawToolUtilityShape(LineString([center, p1]))

        if len(self.points) == 2:  # Show the arc

            if self.mode == 'c12':
                center = self.points[0]
                p1 = self.points[1]
                p2 = data

                radius = sqrt((center[0] - p1[0]) ** 2 + (center[1] - p1[1]) ** 2)
                startangle = arctan2(p1[1] - center[1], p1[0] - center[0])
                stopangle = arctan2(p2[1] - center[1], p2[0] - center[0])

                return DrawToolUtilityShape([LineString(arc(center, radius, startangle, stopangle,
                                                            self.direction, self.steps_per_circ)),
                                             Point(center)])

            elif self.mode == '132':
                p1 = array(self.points[0])
                p3 = array(self.points[1])
                p2 = array(data)

                try:
                    center, radius, t = three_point_circle(p1, p2, p3)
                except TypeError:
                    return

                direction = 'cw' if sign(t) > 0 else 'ccw'

                startangle = arctan2(p1[1] - center[1], p1[0] - center[0])
                stopangle = arctan2(p3[1] - center[1], p3[0] - center[0])

                return DrawToolUtilityShape([LineString(arc(center, radius, startangle, stopangle,
                                                            direction, self.steps_per_circ)),
                                             Point(center), Point(p1), Point(p3)])

            else:  # '12c'
                p1 = array(self.points[0])
                p2 = array(self.points[1])

                # Midpoint
                a = (p1 + p2) / 2.0

                # Parallel vector
                c = p2 - p1

                # Perpendicular vector
                b = dot(c, array([[0, -1], [1, 0]], dtype=float32))
                b /= numpy_norm(b)

                # Distance
                t = distance(data, a)

                # Which side? Cross product with c.
                # cross(M-A, B-A), where line is AB and M is test point.
                side = (data[0] - p1[0]) * c[1] - (data[1] - p1[1]) * c[0]
                t *= sign(side)

                # Center = a + bt
                center = a + b * t

                radius = numpy_norm(center - p1)
                startangle = arctan2(p1[1] - center[1], p1[0] - center[0])
                stopangle = arctan2(p2[1] - center[1], p2[0] - center[0])

                return DrawToolUtilityShape([LineString(arc(center, radius, startangle, stopangle,
                                                            self.direction, self.steps_per_circ)),
                                             Point(center)])

        return None

    def make(self):

        if self.mode == 'c12':
            center = self.points[0]
            p1 = self.points[1]
            p2 = self.points[2]

            radius = distance(center, p1)
            startangle = arctan2(p1[1] - center[1], p1[0] - center[0])
            stopangle = arctan2(p2[1] - center[1], p2[0] - center[0])
            self.geometry = DrawToolShape(LineString(arc(center, radius, startangle, stopangle,
                                                         self.direction, self.steps_per_circ)))

        elif self.mode == '132':
            p1 = array(self.points[0])
            p3 = array(self.points[1])
            p2 = array(self.points[2])

            center, radius, t = three_point_circle(p1, p2, p3)
            direction = 'cw' if sign(t) > 0 else 'ccw'

            startangle = arctan2(p1[1] - center[1], p1[0] - center[0])
            stopangle = arctan2(p3[1] - center[1], p3[0] - center[0])

            self.geometry = DrawToolShape(LineString(arc(center, radius, startangle, stopangle,
                                                         direction, self.steps_per_circ)))

        else:  # self.mode == '12c'
            p1 = array(self.points[0])
            p2 = array(self.points[1])
            pc = array(self.points[2])

            # Midpoint
            a = (p1 + p2) / 2.0

            # Parallel vector
            c = p2 - p1

            # Perpendicular vector
            b = dot(c, array([[0, -1], [1, 0]], dtype=float32))
            b /= numpy_norm(b)

            # Distance
            t = distance(pc, a)

            # Which side? Cross product with c.
            # cross(M-A, B-A), where line is AB and M is test point.
            side = (pc[0] - p1[0]) * c[1] - (pc[1] - p1[1]) * c[0]
            t *= sign(side)

            # Center = a + bt
            center = a + b * t

            radius = numpy_norm(center - p1)
            startangle = arctan2(p1[1] - center[1], p1[0] - center[0])
            stopangle = arctan2(p2[1] - center[1], p2[0] - center[0])

            self.geometry = DrawToolShape(LineString(arc(center, radius, startangle, stopangle,
                                                         self.direction, self.steps_per_circ)))
        self.complete = True
        self.draw_app.app.inform.emit(_("[success] Done. Arc completed."))


class FCRectangle(FCShapeTool):
    """
    Resulting type: Polygon
    """

    def __init__(self, draw_app):
        DrawTool.__init__(self, draw_app)
        self.name = 'rectangle'

        try:
            QtGui.QGuiApplication.restoreOverrideCursor()
        except Exception as e:
            pass
        self.cursor = QtGui.QCursor(QtGui.QPixmap('share/aero.png'))
        QtGui.QGuiApplication.setOverrideCursor(self.cursor)

        self.draw_app.app.inform.emit( _("Click on 1st corner ..."))

    def click(self, point):
        self.points.append(point)

        if len(self.points) == 1:
            self.draw_app.app.inform.emit(_("Click on opposite corner to complete ..."))
            return "Click on opposite corner to complete ..."

        if len(self.points) == 2:
            self.make()
            return "Done."

        return ""

    def utility_geometry(self, data=None):
        if len(self.points) == 1:
            p1 = self.points[0]
            p2 = data
            return DrawToolUtilityShape(LinearRing([p1, (p2[0], p1[1]), p2, (p1[0], p2[1])]))

        return None

    def make(self):
        try:
            QtGui.QGuiApplication.restoreOverrideCursor()
        except Exception as e:
            pass

        p1 = self.points[0]
        p2 = self.points[1]
        # self.geometry = LinearRing([p1, (p2[0], p1[1]), p2, (p1[0], p2[1])])
        self.geometry = DrawToolShape(Polygon([p1, (p2[0], p1[1]), p2, (p1[0], p2[1])]))
        self.complete = True
        self.draw_app.app.inform.emit(_("[success] Done. Rectangle completed."))


class FCPolygon(FCShapeTool):
    """
    Resulting type: Polygon
    """

    def __init__(self, draw_app):
        DrawTool.__init__(self, draw_app)
        self.name = 'polygon'

        try:
            QtGui.QGuiApplication.restoreOverrideCursor()
        except Exception as e:
            pass
        self.cursor = QtGui.QCursor(QtGui.QPixmap('share/aero.png'))
        QtGui.QGuiApplication.setOverrideCursor(self.cursor)

        self.draw_app.app.inform.emit(_("Click on 1st corner ..."))

    def click(self, point):
        self.draw_app.in_action = True
        self.points.append(point)

        if len(self.points) > 0:
            self.draw_app.app.inform.emit(_("Click on next Point or click right mouse button to complete ..."))
            return "Click on next point or hit ENTER to complete ..."

        return ""

    def utility_geometry(self, data=None):
        if len(self.points) == 1:
            temp_points = [x for x in self.points]
            temp_points.append(data)
            return DrawToolUtilityShape(LineString(temp_points))

        if len(self.points) > 1:
            temp_points = [x for x in self.points]
            temp_points.append(data)
            return DrawToolUtilityShape(LinearRing(temp_points))

        return None

    def make(self):
        try:
            QtGui.QGuiApplication.restoreOverrideCursor()
        except Exception as e:
            pass

        # self.geometry = LinearRing(self.points)
        self.geometry = DrawToolShape(Polygon(self.points))
        self.draw_app.in_action = False
        self.complete = True
        self.draw_app.app.inform.emit(_("[success] Done. Polygon completed."))

    def on_key(self, key):
        if key == 'Backspace' or key == QtCore.Qt.Key_Backspace:
            if len(self.points) > 0:
                self.points = self.points[0:-1]
                # Remove any previous utility shape
                self.draw_app.tool_shape.clear(update=False)
                geo = self.utility_geometry(data=(self.draw_app.snap_x, self.draw_app.snap_y))
                self.draw_app.draw_utility_geometry(geo=geo)
                return _("Backtracked one point ...")


class FCPath(FCPolygon):
    """
    Resulting type: LineString
    """
    def __init__(self, draw_app):
        FCPolygon.__init__(self, draw_app)

        try:
            QtGui.QGuiApplication.restoreOverrideCursor()
        except Exception as e:
            pass
        self.cursor = QtGui.QCursor(QtGui.QPixmap('share/aero_path5.png'))
        QtGui.QGuiApplication.setOverrideCursor(self.cursor)

    def make(self):
        self.geometry = DrawToolShape(LineString(self.points))
        self.name = 'path'

        try:
            QtGui.QGuiApplication.restoreOverrideCursor()
        except Exception as e:
            pass

        self.draw_app.in_action = False
        self.complete = True
        self.draw_app.app.inform.emit(_("[success] Done. Path completed."))

    def utility_geometry(self, data=None):
        if len(self.points) > 0:
            temp_points = [x for x in self.points]
            temp_points.append(data)
            return DrawToolUtilityShape(LineString(temp_points))

        return None

    def on_key(self, key):
        if key == 'Backspace' or key == QtCore.Qt.Key_Backspace:
            if len(self.points) > 0:
                self.points = self.points[0:-1]
                # Remove any previous utility shape
                self.draw_app.tool_shape.clear(update=False)
                geo = self.utility_geometry(data=(self.draw_app.snap_x, self.draw_app.snap_y))
                self.draw_app.draw_utility_geometry(geo=geo)
                return _("Backtracked one point ...")


class FCSelect(DrawTool):
    def __init__(self, draw_app):
        DrawTool.__init__(self, draw_app)
        self.name = 'select'

        try:
            QtGui.QGuiApplication.restoreOverrideCursor()
        except Exception as e:
            pass

        self.storage = self.draw_app.storage
        # self.shape_buffer = self.draw_app.shape_buffer
        # self.selected = self.draw_app.selected

    def click_release(self, point):

        self.select_shapes(point)
        return ""

    def select_shapes(self, pos):
        # list where we store the overlapped shapes under our mouse left click position
        over_shape_list = []

        # pos[0] and pos[1] are the mouse click coordinates (x, y)
        for obj_shape in self.storage.get_objects():
            # first method of click selection -> inconvenient
            # minx, miny, maxx, maxy = obj_shape.geo.bounds
            # if (minx <= pos[0] <= maxx) and (miny <= pos[1] <= maxy):
            #     over_shape_list.append(obj_shape)

            # second method of click selection -> slow
            # outside = obj_shape.geo.buffer(0.1)
            # inside = obj_shape.geo.buffer(-0.1)
            # shape_band = outside.difference(inside)
            # if Point(pos).within(shape_band):
            #     over_shape_list.append(obj_shape)

            # 3rd method of click selection -> inconvenient
            try:
                _, closest_shape = self.storage.nearest(pos)
            except StopIteration:
                return ""

            over_shape_list.append(closest_shape)

        try:
            # if there is no shape under our click then deselect all shapes
            # it will not work for 3rd method of click selection
            if not over_shape_list:
                self.draw_app.selected = []
                FlatCAMGeoEditor.draw_shape_idx = -1
            else:
                # if there are shapes under our click then advance through the list of them, one at the time in a
                # circular way
                FlatCAMGeoEditor.draw_shape_idx = (FlatCAMGeoEditor.draw_shape_idx + 1) % len(over_shape_list)
                obj_to_add = over_shape_list[int(FlatCAMGeoEditor.draw_shape_idx)]

                key_modifier = QtWidgets.QApplication.keyboardModifiers()
                if self.draw_app.app.defaults["global_mselect_key"] == 'Control':
                    # if CONTROL key is pressed then we add to the selected list the current shape but if it's already
                    # in the selected list, we removed it. Therefore first click selects, second deselects.
                    if key_modifier == Qt.ControlModifier:
                        if obj_to_add in self.draw_app.selected:
                            self.draw_app.selected.remove(obj_to_add)
                        else:
                            self.draw_app.selected.append(obj_to_add)
                    else:
                        self.draw_app.selected = []
                        self.draw_app.selected.append(obj_to_add)
                else:
                    if key_modifier == Qt.ShiftModifier:
                        if obj_to_add in self.draw_app.selected:
                            self.draw_app.selected.remove(obj_to_add)
                        else:
                            self.draw_app.selected.append(obj_to_add)
                    else:
                        self.draw_app.selected = []
                        self.draw_app.selected.append(obj_to_add)

        except Exception as e:
            log.error("[ERROR] Something went bad. %s" % str(e))
            raise


class FCMove(FCShapeTool):
    def __init__(self, draw_app):
        FCShapeTool.__init__(self, draw_app)
        self.name = 'move'

        try:
            QtGui.QGuiApplication.restoreOverrideCursor()
        except Exception as e:
            pass

        self.storage = self.draw_app.storage

        self.origin = None
        self.destination = None
        self.sel_limit = self.draw_app.app.defaults["geometry_editor_sel_limit"]
        self.selection_shape = self.selection_bbox()

        if len(self.draw_app.get_selected()) == 0:
            self.draw_app.app.inform.emit(_("[WARNING_NOTCL] MOVE: No shape selected. Select a shape to move ..."))
        else:
            self.draw_app.app.inform.emit(_(" MOVE: Click on reference point ..."))

    def set_origin(self, origin):
        self.draw_app.app.inform.emit(_(" Click on destination point ..."))
        self.origin = origin

    def click(self, point):
        if len(self.draw_app.get_selected()) == 0:
            # self.complete = True
            # self.draw_app.app.inform.emit(_("[WARNING_NOTCL] Move cancelled. No shape selected."))
            self.select_shapes(point)
            self.draw_app.replot()
            self.draw_app.app.inform.emit(_(" MOVE: Click on reference point ..."))
            return

        if self.origin is None:
            self.set_origin(point)
            self.selection_shape = self.selection_bbox()
            return "Click on final location."
        else:
            self.destination = point
            self.make()
            # self.draw_app.app.worker_task.emit(({'fcn': self.make,
            #                                      'params': []}))
            return "Done."

    def make(self):
        with self.draw_app.app.proc_container.new("Moving Geometry ..."):
            # Create new geometry
            dx = self.destination[0] - self.origin[0]
            dy = self.destination[1] - self.origin[1]
            self.geometry = [DrawToolShape(affinity.translate(geom.geo, xoff=dx, yoff=dy))
                             for geom in self.draw_app.get_selected()]

            # Delete old
            self.draw_app.delete_selected()
            self.complete = True
            self.draw_app.app.inform.emit(_("[success] Done. Geometry(s) Move completed."))

    def selection_bbox(self):
        geo_list = []
        for select_shape in self.draw_app.get_selected():
            geometric_data = select_shape.geo
            try:
                for g in geometric_data:
                    geo_list.append(g)
            except TypeError:
                geo_list.append(geometric_data)

        xmin, ymin, xmax, ymax = get_shapely_list_bounds(geo_list)

        pt1 = (xmin, ymin)
        pt2 = (xmax, ymin)
        pt3 = (xmax, ymax)
        pt4 = (xmin, ymax)

        return Polygon([pt1, pt2, pt3, pt4])

    def utility_geometry(self, data=None):
        """
        Temporary geometry on screen while using this tool.

        :param data:
        :return:
        """
        geo_list = []

        if self.origin is None:
            return None

        if len(self.draw_app.get_selected()) == 0:
            return None

        dx = data[0] - self.origin[0]
        dy = data[1] - self.origin[1]

        if len(self.draw_app.get_selected()) <= self.sel_limit:
            try:
                for geom in self.draw_app.get_selected():
                    geo_list.append(affinity.translate(geom.geo, xoff=dx, yoff=dy))
            except AttributeError:
                self.draw_app.select_tool('select')
                self.draw_app.selected = []
                return
            return DrawToolUtilityShape(geo_list)
        else:
            try:
                ss_el = affinity.translate(self.selection_shape, xoff=dx, yoff=dy)
            except ValueError:
                ss_el = None
            return DrawToolUtilityShape(ss_el)

    def select_shapes(self, pos):
        # list where we store the overlapped shapes under our mouse left click position
        over_shape_list = []

        try:
            _, closest_shape = self.storage.nearest(pos)
        except StopIteration:
            return ""

        over_shape_list.append(closest_shape)

        try:
            # if there is no shape under our click then deselect all shapes
            # it will not work for 3rd method of click selection
            if not over_shape_list:
                self.draw_app.selected = []
                self.draw_app.draw_shape_idx = -1
            else:
                # if there are shapes under our click then advance through the list of them, one at the time in a
                # circular way
                self.draw_app.draw_shape_idx = (FlatCAMGeoEditor.draw_shape_idx + 1) % len(over_shape_list)
                try:
                    obj_to_add = over_shape_list[int(FlatCAMGeoEditor.draw_shape_idx)]
                except IndexError:
                    return

                key_modifier = QtWidgets.QApplication.keyboardModifiers()
                if self.draw_app.app.defaults["global_mselect_key"] == 'Control':
                    # if CONTROL key is pressed then we add to the selected list the current shape but if it's
                    # already in the selected list, we removed it. Therefore first click selects, second deselects.
                    if key_modifier == Qt.ControlModifier:
                        if obj_to_add in self.draw_app.selected:
                            self.draw_app.selected.remove(obj_to_add)
                        else:
                            self.draw_app.selected.append(obj_to_add)
                    else:
                        self.draw_app.selected = []
                        self.draw_app.selected.append(obj_to_add)
                else:
                    if key_modifier == Qt.ShiftModifier:
                        if obj_to_add in self.draw_app.selected:
                            self.draw_app.selected.remove(obj_to_add)
                        else:
                            self.draw_app.selected.append(obj_to_add)
                    else:
                        self.draw_app.selected = []
                        self.draw_app.selected.append(obj_to_add)

        except Exception as e:
            log.error("[ERROR] Something went bad. %s" % str(e))
            raise


class FCCopy(FCMove):
    def __init__(self, draw_app):
        FCMove.__init__(self, draw_app)
        self.name = 'copy'

    def make(self):
        # Create new geometry
        dx = self.destination[0] - self.origin[0]
        dy = self.destination[1] - self.origin[1]
        self.geometry = [DrawToolShape(affinity.translate(geom.geo, xoff=dx, yoff=dy))
                         for geom in self.draw_app.get_selected()]
        self.complete = True
        self.draw_app.app.inform.emit(_("[success] Done. Geometry(s) Copy completed."))


class FCText(FCShapeTool):
    def __init__(self, draw_app):
        FCShapeTool.__init__(self, draw_app)
        self.name = 'text'

        try:
            QtGui.QGuiApplication.restoreOverrideCursor()
        except Exception as e:
            pass
        self.cursor = QtGui.QCursor(QtGui.QPixmap('share/aero_text.png'))
        QtGui.QGuiApplication.setOverrideCursor(self.cursor)


        # self.shape_buffer = self.draw_app.shape_buffer
        self.draw_app = draw_app
        self.app = draw_app.app

        self.draw_app.app.inform.emit(_("Click on 1st corner ..."))
        self.origin = (0, 0)

        self.text_gui = TextInputTool(self.app)
        self.text_gui.run()

    def click(self, point):
        # Create new geometry
        dx = point[0]
        dy = point[1]

        if self.text_gui.text_path:
            try:
                self.geometry = DrawToolShape(affinity.translate(self.text_gui.text_path, xoff=dx, yoff=dy))
            except Exception as e:
                log.debug("Font geometry is empty or incorrect: %s" % str(e))
                self.draw_app.app.inform.emit(_("[ERROR]Font not supported. Only Regular, Bold, Italic and BoldItalic are "
                                              "supported. Error: %s") % str(e))
                self.text_gui.text_path = []
                self.text_gui.hide_tool()
                self.draw_app.select_tool('select')
                return
        else:
            self.draw_app.app.inform.emit(_("[WARNING_NOTCL] No text to add."))
            return

        self.text_gui.text_path = []
        self.text_gui.hide_tool()
        self.complete = True
        self.draw_app.app.inform.emit(_("[success] Done. Adding Text completed."))

    def utility_geometry(self, data=None):
        """
        Temporary geometry on screen while using this tool.

        :param data: mouse position coords
        :return:
        """

        dx = data[0] - self.origin[0]
        dy = data[1] - self.origin[1]

        try:
            return DrawToolUtilityShape(affinity.translate(self.text_gui.text_path, xoff=dx, yoff=dy))
        except:
            return


class FCBuffer(FCShapeTool):
    def __init__(self, draw_app):
        FCShapeTool.__init__(self, draw_app)
        self.name = 'buffer'

        # self.shape_buffer = self.draw_app.shape_buffer
        self.draw_app = draw_app
        self.app = draw_app.app

        self.draw_app.app.inform.emit(_("Create buffer geometry ..."))
        self.origin = (0, 0)
        self.buff_tool = BufferSelectionTool(self.app, self.draw_app)
        self.buff_tool.run()
        self.app.ui.notebook.setTabText(2, _("Buffer Tool"))
        if self.draw_app.app.ui.splitter.sizes()[0] == 0:
            self.draw_app.app.ui.splitter.setSizes([1, 1])
        self.activate()

    def on_buffer(self):
        if not self.draw_app.selected:
            self.app.inform.emit(_("[WARNING_NOTCL] Buffer cancelled. No shape selected."))
            return

        try:
            buffer_distance = float(self.buff_tool.buffer_distance_entry.get_value())
        except ValueError:
            # try to convert comma to decimal point. if it's still not working error message and return
            try:
                buffer_distance = float(self.buff_tool.buffer_distance_entry.get_value().replace(',', '.'))
                self.buff_tool.buffer_distance_entry.set_value(buffer_distance)
            except ValueError:
                self.app.inform.emit(_("[WARNING_NOTCL] Buffer distance value is missing or wrong format. "
                                     "Add it and retry."))
                return
        # the cb index start from 0 but the join styles for the buffer start from 1 therefore the adjustment
        # I populated the combobox such that the index coincide with the join styles value (whcih is really an INT)
        join_style = self.buff_tool.buffer_corner_cb.currentIndex() + 1
        ret_val = self.draw_app.buffer(buffer_distance, join_style)
        self.app.ui.notebook.setTabText(2, _("Tools"))
        self.draw_app.app.ui.splitter.setSizes([0, 1])

        self.disactivate()
        if ret_val == 'fail':
            return
        self.draw_app.app.inform.emit(_("[success] Done. Buffer Tool completed."))

    def on_buffer_int(self):
        if not self.draw_app.selected:
            self.app.inform.emit(_("[WARNING_NOTCL] Buffer cancelled. No shape selected."))
            return

        try:
            buffer_distance = float(self.buff_tool.buffer_distance_entry.get_value())
        except ValueError:
            # try to convert comma to decimal point. if it's still not working error message and return
            try:
                buffer_distance = float(self.buff_tool.buffer_distance_entry.get_value().replace(',', '.'))
                self.buff_tool.buffer_distance_entry.set_value(buffer_distance)
            except ValueError:
                self.app.inform.emit(_("[WARNING_NOTCL] Buffer distance value is missing or wrong format. "
                                     "Add it and retry."))
                return
        # the cb index start from 0 but the join styles for the buffer start from 1 therefore the adjustment
        # I populated the combobox such that the index coincide with the join styles value (whcih is really an INT)
        join_style = self.buff_tool.buffer_corner_cb.currentIndex() + 1
        ret_val = self.draw_app.buffer_int(buffer_distance, join_style)
        self.app.ui.notebook.setTabText(2, _("Tools"))
        self.draw_app.app.ui.splitter.setSizes([0, 1])

        self.disactivate()
        if ret_val == 'fail':
            return
        self.draw_app.app.inform.emit(_("[success] Done. Buffer Int Tool completed."))

    def on_buffer_ext(self):
        if not self.draw_app.selected:
            self.app.inform.emit(_("[WARNING_NOTCL] Buffer cancelled. No shape selected."))
            return

        try:
            buffer_distance = float(self.buff_tool.buffer_distance_entry.get_value())
        except ValueError:
            # try to convert comma to decimal point. if it's still not working error message and return
            try:
                buffer_distance = float(self.buff_tool.buffer_distance_entry.get_value().replace(',', '.'))
                self.buff_tool.buffer_distance_entry.set_value(buffer_distance)
            except ValueError:
                self.app.inform.emit(_("[WARNING_NOTCL] Buffer distance value is missing or wrong format. "
                                     "Add it and retry."))
                return
        # the cb index start from 0 but the join styles for the buffer start from 1 therefore the adjustment
        # I populated the combobox such that the index coincide with the join styles value (whcih is really an INT)
        join_style = self.buff_tool.buffer_corner_cb.currentIndex() + 1
        ret_val = self.draw_app.buffer_ext(buffer_distance, join_style)
        self.app.ui.notebook.setTabText(2, _("Tools"))
        self.draw_app.app.ui.splitter.setSizes([0, 1])

        self.disactivate()
        if ret_val == 'fail':
            return
        self.draw_app.app.inform.emit(_("[success] Done. Buffer Ext Tool completed."))

    def activate(self):
        self.buff_tool.buffer_button.clicked.disconnect()
        self.buff_tool.buffer_int_button.clicked.disconnect()
        self.buff_tool.buffer_ext_button.clicked.disconnect()

        self.buff_tool.buffer_button.clicked.connect(self.on_buffer)
        self.buff_tool.buffer_int_button.clicked.connect(self.on_buffer_int)
        self.buff_tool.buffer_ext_button.clicked.connect(self.on_buffer_ext)

    def disactivate(self):
        self.buff_tool.buffer_button.clicked.disconnect()
        self.buff_tool.buffer_int_button.clicked.disconnect()
        self.buff_tool.buffer_ext_button.clicked.disconnect()

        self.buff_tool.buffer_button.clicked.connect(self.buff_tool.on_buffer)
        self.buff_tool.buffer_int_button.clicked.connect(self.buff_tool.on_buffer_int)
        self.buff_tool.buffer_ext_button.clicked.connect(self.buff_tool.on_buffer_ext)
        self.complete = True
        self.draw_app.select_tool("select")
        self.buff_tool.hide_tool()


class FCEraser(FCShapeTool):
    def __init__(self, draw_app):
        DrawTool.__init__(self, draw_app)
        self.name = 'eraser'

        self.origin = None
        self.destination = None

        if len(self.draw_app.get_selected()) == 0:
            if self.draw_app.launched_from_shortcuts is True:
                self.draw_app.launched_from_shortcuts = False
            self.draw_app.app.inform.emit(_("Select a shape to act as deletion area ..."))
        else:
            self.draw_app.app.inform.emit(_("Click to pick-up the erase shape..."))

        self.geometry = []
        self.storage = self.draw_app.storage

        # Switch notebook to Selected page
        self.draw_app.app.ui.notebook.setCurrentWidget(self.draw_app.app.ui.selected_tab)

    def set_origin(self, origin):
        self.origin = origin

    def click(self, point):
        if len(self.draw_app.get_selected()) == 0:
            for obj_shape in self.storage.get_objects():
                try:
                    __, closest_shape = self.storage.nearest(point)
                    self.draw_app.selected.append(closest_shape)
                except StopIteration:
                    if len(self.draw_app.selected) > 0:
                        self.draw_app.app.inform.emit(_("Click to pick-up the erase shape..."))
                    return ""

        if len(self.draw_app.get_selected()) == 0:
            return "Nothing to ersase."
        else:
            self.draw_app.app.inform.emit(_("Click to pick-up the erase shape..."))

        if self.origin is None:
            self.set_origin(point)
            self.draw_app.app.inform.emit(_("Click to erase ..."))
            return
        else:
            self.destination = point
            self.make()

            # self.draw_app.select_tool("select")
            return

    def make(self):
        eraser_sel_shapes = []

        # create the eraser shape from selection
        for eraser_shape in self.utility_geometry(data=self.destination).geo:
            temp_shape = eraser_shape.buffer(0.0000001)
            temp_shape = Polygon(temp_shape.exterior)
            eraser_sel_shapes.append(temp_shape)
        eraser_sel_shapes = cascaded_union(eraser_sel_shapes)

        for obj_shape in self.storage.get_objects():
            try:
                geometric_data = obj_shape.geo
                if eraser_sel_shapes.intersects(geometric_data):
                    obj_shape.geo = geometric_data.difference(eraser_sel_shapes)
            except KeyError:
                pass

        self.draw_app.delete_utility_geometry()
        self.draw_app.plot_all()
        self.draw_app.app.inform.emit(_("[success] Done. Eraser tool action completed."))

    def utility_geometry(self, data=None):
        """
        Temporary geometry on screen while using this tool.

        :param data:
        :return:
        """
        geo_list = []

        if self.origin is None:
            return None

        if len(self.draw_app.get_selected()) == 0:
            return None

        dx = data[0] - self.origin[0]
        dy = data[1] - self.origin[1]

        try:
            for geom in self.draw_app.get_selected():
                geo_list.append(affinity.translate(geom.geo, xoff=dx, yoff=dy))
        except AttributeError:
            self.draw_app.select_tool('select')
            self.draw_app.selected = []
            return
        return DrawToolUtilityShape(geo_list)

    def clean_up(self):
        self.draw_app.selected = []
        self.draw_app.plot_all()


class FCPaint(FCShapeTool):
    def __init__(self, draw_app):
        FCShapeTool.__init__(self, draw_app)
        self.name = 'paint'

        # self.shape_buffer = self.draw_app.shape_buffer
        self.draw_app = draw_app
        self.app = draw_app.app

        self.draw_app.app.inform.emit(_("Create Paint geometry ..."))
        self.origin = (0, 0)
        self.draw_app.paint_tool.run()


class FCTransform(FCShapeTool):
    def __init__(self, draw_app):
        FCShapeTool.__init__(self, draw_app)
        self.name = 'transformation'

        # self.shape_buffer = self.draw_app.shape_buffer
        self.draw_app = draw_app
        self.app = draw_app.app

        self.draw_app.app.inform.emit(_("Shape transformations ..."))
        self.origin = (0, 0)
        self.draw_app.transform_tool.run()


# ###############################################
# ################ Main Application #############
# ###############################################
class FlatCAMGeoEditor(QtCore.QObject):

    transform_complete = QtCore.pyqtSignal()

    draw_shape_idx = -1

    def __init__(self, app, disabled=False):
        assert isinstance(app, FlatCAMApp.App), \
            "Expected the app to be a FlatCAMApp.App, got %s" % type(app)

        super(FlatCAMGeoEditor, self).__init__()

        self.app = app
        self.canvas = app.plotcanvas

        # ## Toolbar events and properties
        self.tools = {
            "select": {"button": self.app.ui.geo_select_btn,
                       "constructor": FCSelect},
            "arc": {"button": self.app.ui.geo_add_arc_btn,
                    "constructor": FCArc},
            "circle": {"button": self.app.ui.geo_add_circle_btn,
                       "constructor": FCCircle},
            "path": {"button": self.app.ui.geo_add_path_btn,
                     "constructor": FCPath},
            "rectangle": {"button": self.app.ui.geo_add_rectangle_btn,
                          "constructor": FCRectangle},
            "polygon": {"button": self.app.ui.geo_add_polygon_btn,
                        "constructor": FCPolygon},
            "text": {"button": self.app.ui.geo_add_text_btn,
                     "constructor": FCText},
            "buffer": {"button": self.app.ui.geo_add_buffer_btn,
                     "constructor": FCBuffer},
            "paint": {"button": self.app.ui.geo_add_paint_btn,
                       "constructor": FCPaint},
            "eraser": {"button": self.app.ui.geo_eraser_btn,
                       "constructor": FCEraser},
            "move": {"button": self.app.ui.geo_move_btn,
                     "constructor": FCMove},
            "transform": {"button": self.app.ui.geo_transform_btn,
                      "constructor": FCTransform},
            "copy": {"button": self.app.ui.geo_copy_btn,
                     "constructor": FCCopy}
        }

        # # ## Data
        self.active_tool = None

        self.storage = FlatCAMGeoEditor.make_storage()
        self.utility = []

        # VisPy visuals
        self.fcgeometry = None
        self.shapes = self.app.plotcanvas.new_shape_collection(layers=1)
        self.tool_shape = self.app.plotcanvas.new_shape_collection(layers=1)
        self.app.pool_recreated.connect(self.pool_recreated)

        # Remove from scene
        self.shapes.enabled = False
        self.tool_shape.enabled = False

        # List of selected shapes.
        self.selected = []

        self.flat_geo = []

        self.move_timer = QtCore.QTimer()
        self.move_timer.setSingleShot(True)

        # this var will store the state of the toolbar before starting the editor
        self.toolbar_old_state = False

        self.key = None  # Currently pressed key
        self.geo_key_modifiers = None
        self.x = None  # Current mouse cursor pos
        self.y = None

        # if we edit a multigeo geometry store here the tool number
        self.multigeo_tool = None

        # Current snapped mouse pos
        self.snap_x = None
        self.snap_y = None
        self.pos = None

        # signal that there is an action active like polygon or path
        self.in_action = False

        # this will flag if the Editor "tools" are launched from key shortcuts (True) or from menu toolbar (False)
        self.launched_from_shortcuts = False

        def make_callback(thetool):
            def f():
                self.on_tool_select(thetool)
            return f

        for tool in self.tools:
            self.tools[tool]["button"].triggered.connect(make_callback(tool))  # Events
            self.tools[tool]["button"].setCheckable(True)  # Checkable

        self.app.ui.grid_snap_btn.triggered.connect(self.on_grid_toggled)
        self.app.ui.corner_snap_btn.setCheckable(True)
        self.app.ui.corner_snap_btn.triggered.connect(lambda: self.toolbar_tool_toggle("corner_snap"))

        self.options = {
            "global_gridx": 0.1,
            "global_gridy": 0.1,
            "global_snap_max": 0.05,
            "grid_snap": True,
            "corner_snap": False,
            "grid_gap_link": True
        }
        self.app.options_read_form()

        for option in self.options:
            if option in self.app.options:
                self.options[option] = self.app.options[option]

        self.app.ui.grid_gap_x_entry.setText(str(self.options["global_gridx"]))
        self.app.ui.grid_gap_y_entry.setText(str(self.options["global_gridy"]))
        self.app.ui.snap_max_dist_entry.setText(str(self.options["global_snap_max"]))
        self.app.ui.grid_gap_link_cb.setChecked(True)

        self.rtree_index = rtindex.Index()

        def entry2option(option, entry):
            try:
                self.options[option] = float(entry.text())
            except Exception as e:
                log.debug("FlatCAMGeoEditor.__init__().entry2option() --> %s" % str(e))
                return

        def gridx_changed(goption, gentry):
            entry2option(option=goption, entry=gentry)
            # if the grid link is checked copy the value in the GridX field to GridY
            try:
                val = float(self.app.ui.grid_gap_x_entry.get_value())
            except ValueError:
                return

            units = self.app.ui.general_defaults_form.general_app_group.units_radio.get_value().upper()
            dec = 6 if units == 'IN' else 4
            if self.app.ui.grid_gap_link_cb.isChecked():
                self.app.ui.grid_gap_y_entry.set_value(val, decimals=dec)

        self.app.ui.grid_gap_x_entry.setValidator(QtGui.QDoubleValidator())
        self.app.ui.grid_gap_x_entry.textChanged.connect(
            lambda: gridx_changed("global_gridx", self.app.ui.grid_gap_x_entry))

        self.app.ui.grid_gap_y_entry.setValidator(QtGui.QDoubleValidator())
        self.app.ui.grid_gap_y_entry.textChanged.connect(
            lambda: entry2option("global_gridy", self.app.ui.grid_gap_y_entry))

        self.app.ui.snap_max_dist_entry.setValidator(QtGui.QDoubleValidator())
        self.app.ui.snap_max_dist_entry.textChanged.connect(
            lambda: entry2option("snap_max", self.app.ui.snap_max_dist_entry))

        # if using Paint store here the tool diameter used
        self.paint_tooldia = None

        self.paint_tool = PaintOptionsTool(self.app, self)
        self.transform_tool = TransformEditorTool(self.app, self)

        self.app.ui.geo_add_circle_menuitem.triggered.connect(lambda: self.select_tool('circle'))
        self.app.ui.geo_add_arc_menuitem.triggered.connect(lambda: self.select_tool('arc'))
        self.app.ui.geo_add_rectangle_menuitem.triggered.connect(lambda: self.select_tool('rectangle'))
        self.app.ui.geo_add_polygon_menuitem.triggered.connect(lambda: self.select_tool('polygon'))
        self.app.ui.geo_add_path_menuitem.triggered.connect(lambda: self.select_tool('path'))
        self.app.ui.geo_add_text_menuitem.triggered.connect(lambda: self.select_tool('text'))
        self.app.ui.geo_paint_menuitem.triggered.connect(self.on_paint_tool)
        self.app.ui.geo_buffer_menuitem.triggered.connect(self.on_buffer_tool)
        self.app.ui.geo_transform_menuitem.triggered.connect(self.transform_tool.run)

        self.app.ui.geo_delete_menuitem.triggered.connect(self.on_delete_btn)
        self.app.ui.geo_union_menuitem.triggered.connect(self.union)
        self.app.ui.geo_intersection_menuitem.triggered.connect(self.intersection)
        self.app.ui.geo_subtract_menuitem.triggered.connect(self.subtract)
        self.app.ui.geo_cutpath_menuitem.triggered.connect(self.cutpath)
        self.app.ui.geo_copy_menuitem.triggered.connect(lambda: self.select_tool('copy'))

        self.app.ui.geo_union_btn.triggered.connect(self.union)
        self.app.ui.geo_intersection_btn.triggered.connect(self.intersection)
        self.app.ui.geo_subtract_btn.triggered.connect(self.subtract)
        self.app.ui.geo_cutpath_btn.triggered.connect(self.cutpath)
        self.app.ui.geo_delete_btn.triggered.connect(self.on_delete_btn)

        self.app.ui.geo_move_menuitem.triggered.connect(self.on_move)
        self.app.ui.geo_cornersnap_menuitem.triggered.connect(self.on_corner_snap)

        self.transform_complete.connect(self.on_transform_complete)

        # store the status of the editor so the Delete at object level will not work until the edit is finished
        self.editor_active = False
        log.debug("Initialization of the FlatCAM Geometry Editor is finished ...")

    def pool_recreated(self, pool):
        self.shapes.pool = pool
        self.tool_shape.pool = pool

    def on_transform_complete(self):
        self.delete_selected()
        self.replot()

    def activate(self):
        # adjust the status of the menu entries related to the editor
        self.app.ui.menueditedit.setDisabled(True)
        self.app.ui.menueditok.setDisabled(False)
        # adjust the visibility of some of the canvas context menu
        self.app.ui.popmenu_edit.setVisible(False)
        self.app.ui.popmenu_save.setVisible(True)

        self.connect_canvas_event_handlers()

        # initialize working objects
        self.storage = FlatCAMGeoEditor.make_storage()
        self.utility = []
        self.selected = []

        self.shapes.enabled = True
        self.tool_shape.enabled = True
        self.app.app_cursor.enabled = True

        self.app.ui.snap_max_dist_entry.setEnabled(True)
        self.app.ui.corner_snap_btn.setEnabled(True)
        self.app.ui.snap_magnet.setVisible(True)
        self.app.ui.corner_snap_btn.setVisible(True)

        self.app.ui.geo_editor_menu.setDisabled(False)
        self.app.ui.geo_editor_menu.menuAction().setVisible(True)

        self.app.ui.update_obj_btn.setEnabled(True)
        self.app.ui.g_editor_cmenu.setEnabled(True)

        self.app.ui.geo_edit_toolbar.setDisabled(False)
        self.app.ui.geo_edit_toolbar.setVisible(True)

        self.app.ui.snap_toolbar.setDisabled(False)

        self.app.ui.popmenu_disable.setVisible(False)
        self.app.ui.cmenu_newmenu.menuAction().setVisible(False)
        self.app.ui.popmenu_properties.setVisible(False)
        self.app.ui.g_editor_cmenu.menuAction().setVisible(True)

        # prevent the user to change anything in the Selected Tab while the Geo Editor is active
        sel_tab_widget_list = self.app.ui.selected_tab.findChildren(QtWidgets.QWidget)
        for w in sel_tab_widget_list:
            w.setEnabled(False)

        # Tell the App that the editor is active
        self.editor_active = True
        log.debug("Finished activating the Geometry Editor...")

    def deactivate(self):
        try:
            QtGui.QGuiApplication.restoreOverrideCursor()
        except Exception as e:
            pass

        # adjust the status of the menu entries related to the editor
        self.app.ui.menueditedit.setDisabled(False)
        self.app.ui.menueditok.setDisabled(True)
        # adjust the visibility of some of the canvas context menu
        self.app.ui.popmenu_edit.setVisible(True)
        self.app.ui.popmenu_save.setVisible(False)

        self.disconnect_canvas_event_handlers()
        self.clear()
        self.app.ui.geo_edit_toolbar.setDisabled(True)

        settings = QSettings("Open Source", "FlatCAM")
        if settings.contains("layout"):
            layout = settings.value('layout', type=str)
            if layout == 'standard':
                # self.app.ui.geo_edit_toolbar.setVisible(False)

                self.app.ui.snap_max_dist_entry.setEnabled(False)
                self.app.ui.corner_snap_btn.setEnabled(False)
                self.app.ui.snap_magnet.setVisible(False)
                self.app.ui.corner_snap_btn.setVisible(False)
            elif layout == 'compact':
                # self.app.ui.geo_edit_toolbar.setVisible(True)

                self.app.ui.snap_max_dist_entry.setEnabled(False)
                self.app.ui.corner_snap_btn.setEnabled(False)
        else:
            # self.app.ui.geo_edit_toolbar.setVisible(False)

            self.app.ui.snap_magnet.setVisible(False)
            self.app.ui.corner_snap_btn.setVisible(False)
            self.app.ui.snap_max_dist_entry.setEnabled(False)
            self.app.ui.corner_snap_btn.setEnabled(False)

        # set the Editor Toolbar visibility to what was before entering in the Editor
        self.app.ui.geo_edit_toolbar.setVisible(False) if self.toolbar_old_state is False \
            else self.app.ui.geo_edit_toolbar.setVisible(True)

        # Disable visuals
        self.shapes.enabled = False
        self.tool_shape.enabled = False
        self.app.app_cursor.enabled = False

        self.app.ui.geo_editor_menu.setDisabled(True)
        self.app.ui.geo_editor_menu.menuAction().setVisible(False)

        self.app.ui.update_obj_btn.setEnabled(False)

        self.app.ui.g_editor_cmenu.setEnabled(False)
        self.app.ui.e_editor_cmenu.setEnabled(False)

        # Tell the app that the editor is no longer active
        self.editor_active = False

        self.app.ui.popmenu_disable.setVisible(True)
        self.app.ui.cmenu_newmenu.menuAction().setVisible(True)
        self.app.ui.popmenu_properties.setVisible(True)
        self.app.ui.grb_editor_cmenu.menuAction().setVisible(False)
        self.app.ui.e_editor_cmenu.menuAction().setVisible(False)
        self.app.ui.g_editor_cmenu.menuAction().setVisible(False)

        try:
            # re-enable all the widgets in the Selected Tab that were disabled after entering in Edit Geometry Mode
            sel_tab_widget_list = self.app.ui.selected_tab.findChildren(QtWidgets.QWidget)
            for w in sel_tab_widget_list:
                w.setEnabled(True)
        except Exception as e:
            log.debug("FlatCAMGeoEditor.deactivate() --> %s" % str(e))

        # Show original geometry
        if self.fcgeometry:
            self.fcgeometry.visible = True
        log.debug("Finished deactivating the Geometry Editor...")

    def connect_canvas_event_handlers(self):
        # Canvas events

        # first connect to new, then disconnect the old handlers
        # don't ask why but if there is nothing connected I've seen issues
        self.canvas.vis_connect('mouse_press', self.on_canvas_click)
        self.canvas.vis_connect('mouse_move', self.on_canvas_move)
        self.canvas.vis_connect('mouse_release', self.on_geo_click_release)

        # make sure that the shortcuts key and mouse events will no longer be linked to the methods from FlatCAMApp
        # but those from FlatCAMGeoEditor
        self.app.plotcanvas.vis_disconnect('mouse_press', self.app.on_mouse_click_over_plot)
        self.app.plotcanvas.vis_disconnect('mouse_move', self.app.on_mouse_move_over_plot)
        self.app.plotcanvas.vis_disconnect('mouse_release', self.app.on_mouse_click_release_over_plot)
        self.app.plotcanvas.vis_disconnect('mouse_double_click', self.app.on_double_click_over_plot)

        # self.app.collection.view.clicked.disconnect()
        self.app.ui.popmenu_copy.triggered.disconnect()
        self.app.ui.popmenu_delete.triggered.disconnect()
        self.app.ui.popmenu_move.triggered.disconnect()

        self.app.ui.popmenu_copy.triggered.connect(lambda: self.select_tool('copy'))
        self.app.ui.popmenu_delete.triggered.connect(self.on_delete_btn)
        self.app.ui.popmenu_move.triggered.connect(lambda: self.select_tool('move'))

        # Geometry Editor
        self.app.ui.draw_line.triggered.connect(self.draw_tool_path)
        self.app.ui.draw_rect.triggered.connect(self.draw_tool_rectangle)

        self.app.ui.draw_circle.triggered.connect(lambda: self.select_tool('circle'))
        self.app.ui.draw_poly.triggered.connect(lambda: self.select_tool('polygon'))
        self.app.ui.draw_arc.triggered.connect(lambda: self.select_tool('arc'))

        self.app.ui.draw_text.triggered.connect(lambda: self.select_tool('text'))
        self.app.ui.draw_buffer.triggered.connect(lambda: self.select_tool('buffer'))
        self.app.ui.draw_paint.triggered.connect(lambda: self.select_tool('paint'))
        self.app.ui.draw_eraser.triggered.connect(lambda: self.select_tool('eraser'))

        self.app.ui.draw_union.triggered.connect(self.union)
        self.app.ui.draw_intersect.triggered.connect(self.intersection)
        self.app.ui.draw_substract.triggered.connect(self.subtract)
        self.app.ui.draw_cut.triggered.connect(self.cutpath)
        self.app.ui.draw_transform.triggered.connect(lambda: self.select_tool('transform'))

        self.app.ui.draw_move.triggered.connect(self.on_move)

    def disconnect_canvas_event_handlers(self):
        # we restore the key and mouse control to FlatCAMApp method
        # first connect to new, then disconnect the old handlers
        # don't ask why but if there is nothing connected I've seen issues
        self.app.plotcanvas.vis_connect('mouse_press', self.app.on_mouse_click_over_plot)
        self.app.plotcanvas.vis_connect('mouse_move', self.app.on_mouse_move_over_plot)
        self.app.plotcanvas.vis_connect('mouse_release', self.app.on_mouse_click_release_over_plot)
        self.app.plotcanvas.vis_connect('mouse_double_click', self.app.on_double_click_over_plot)
        # self.app.collection.view.clicked.connect(self.app.collection.on_mouse_down)

        self.canvas.vis_disconnect('mouse_press', self.on_canvas_click)
        self.canvas.vis_disconnect('mouse_move', self.on_canvas_move)
        self.canvas.vis_disconnect('mouse_release', self.on_geo_click_release)

        try:
            self.app.ui.popmenu_copy.triggered.disconnect(lambda: self.select_tool('copy'))
        except (TypeError, AttributeError):
            pass
        try:
            self.app.ui.popmenu_delete.triggered.disconnect(self.on_delete_btn)
        except (TypeError, AttributeError):
            pass
        try:
            self.app.ui.popmenu_move.triggered.disconnect(lambda: self.select_tool('move'))
        except (TypeError, AttributeError):
            pass

        self.app.ui.popmenu_copy.triggered.connect(self.app.on_copy_object)
        self.app.ui.popmenu_delete.triggered.connect(self.app.on_delete)
        self.app.ui.popmenu_move.triggered.connect(self.app.obj_move)

        # Geometry Editor
        try:
            self.app.ui.draw_line.triggered.disconnect(self.draw_tool_path)
        except (TypeError, AttributeError):
            pass

        try:
            self.app.ui.draw_rect.triggered.disconnect(self.draw_tool_rectangle)
        except (TypeError, AttributeError):
            pass

        try:
            self.app.ui.draw_cut.triggered.disconnect(self.cutpath)
        except (TypeError, AttributeError):
            pass

        try:
            self.app.ui.draw_move.triggered.disconnect(self.on_move)
        except (TypeError, AttributeError):
            pass

        try:
            self.app.ui.draw_circle.triggered.disconnect()
        except (TypeError, AttributeError):
            pass

        try:
            self.app.ui.draw_poly.triggered.disconnect()
        except (TypeError, AttributeError):
            pass

        try:
            self.app.ui.draw_arc.triggered.disconnect()
        except (TypeError, AttributeError):
            pass


        try:
            self.app.ui.draw_text.triggered.disconnect()
        except (TypeError, AttributeError):
            pass

        try:
            self.app.ui.draw_buffer.triggered.disconnect()
        except (TypeError, AttributeError):
            pass

        try:
            self.app.ui.draw_paint.triggered.disconnect()
        except (TypeError, AttributeError):
            pass

        try:
            self.app.ui.draw_eraser.triggered.disconnect()
        except (TypeError, AttributeError):
            pass

        try:
            self.app.ui.draw_union.triggered.disconnect(self.union)
        except (TypeError, AttributeError):
            pass

        try:
            self.app.ui.draw_intersect.triggered.disconnect(self.intersection)
        except (TypeError, AttributeError):
            pass

        try:
            self.app.ui.draw_substract.triggered.disconnect(self.subtract)
        except (TypeError, AttributeError):
            pass

        try:
            self.app.ui.draw_transform.triggered.disconnect()
        except (TypeError, AttributeError):
            pass

    def add_shape(self, shape):
        """
        Adds a shape to the shape storage.

        :param shape: Shape to be added.
        :type shape: DrawToolShape
        :return: None
        """

        if shape is None:
            return

        # List of DrawToolShape?
        if isinstance(shape, list):
            for subshape in shape:
                self.add_shape(subshape)
            return

        assert isinstance(shape, DrawToolShape), \
            "Expected a DrawToolShape, got %s" % type(shape)

        assert shape.geo is not None, \
            "Shape object has empty geometry (None)"

        assert (isinstance(shape.geo, list) and len(shape.geo) > 0) or \
               not isinstance(shape.geo, list), "Shape objects has empty geometry ([])"

        if isinstance(shape, DrawToolUtilityShape):
            self.utility.append(shape)
        else:
            self.storage.insert(shape)  # TODO: Check performance

    def delete_utility_geometry(self):
        # for_deletion = [shape for shape in self.shape_buffer if shape.utility]
        # for_deletion = [shape for shape in self.storage.get_objects() if shape.utility]
        for_deletion = [shape for shape in self.utility]
        for shape in for_deletion:
            self.delete_shape(shape)

        self.tool_shape.clear(update=True)
        self.tool_shape.redraw()

    def toolbar_tool_toggle(self, key):
        self.options[key] = self.sender().isChecked()
        return 1 if self.options[key] == True else 0

    def clear(self):
        self.active_tool = None
        # self.shape_buffer = []
        self.selected = []
        self.shapes.clear(update=True)
        self.tool_shape.clear(update=True)

        # self.storage = FlatCAMGeoEditor.make_storage()
        self.replot()

    def edit_fcgeometry(self, fcgeometry, multigeo_tool=None):
        """
        Imports the geometry from the given FlatCAM Geometry object
        into the editor.

        :param fcgeometry: FlatCAMGeometry
        :param multigeo_tool: a tool for the case of multigeo
        :return: None
        """
        assert isinstance(fcgeometry, Geometry), \
            "Expected a Geometry, got %s" % type(fcgeometry)

        self.deactivate()
        self.activate()

        # Hide original geometry
        self.fcgeometry = fcgeometry
        fcgeometry.visible = False

        # Set selection tolerance
        DrawToolShape.tolerance = fcgeometry.drawing_tolerance * 10

        self.select_tool("select")

        # Link shapes into editor.
        if multigeo_tool:
            self.multigeo_tool = multigeo_tool
            geo_to_edit = fcgeometry.flatten(geometry=fcgeometry.tools[self.multigeo_tool]['solid_geometry'])
            self.app.inform.emit(_("[WARNING_NOTCL] Editing MultiGeo Geometry, tool: {tool} with diameter: {dia}").
                                 format(tool=self.multigeo_tool, dia=fcgeometry.tools[self.multigeo_tool]['tooldia']))
        else:
            geo_to_edit = fcgeometry.flatten()

        for shape in geo_to_edit:
            if shape is not None:  # TODO: Make flatten never create a None
                if type(shape) == Polygon:
                    self.add_shape(DrawToolShape(shape.exterior))
                    for inter in shape.interiors:
                        self.add_shape(DrawToolShape(inter))
                else:
                    self.add_shape(DrawToolShape(shape))

        self.replot()

        # start with GRID toolbar activated
        if self.app.ui.grid_snap_btn.isChecked() is False:
            self.app.ui.grid_snap_btn.trigger()

    def on_buffer_tool(self):
        buff_tool = BufferSelectionTool(self.app, self)
        buff_tool.run()

    def on_paint_tool(self):
        paint_tool = PaintOptionsTool(self.app, self)
        paint_tool.run()

    def on_tool_select(self, tool):
        """
        Behavior of the toolbar. Tool initialization.

        :rtype : None
        """
        self.app.log.debug("on_tool_select('%s')" % tool)

        # This is to make the group behave as radio group
        if tool in self.tools:
            if self.tools[tool]["button"].isChecked():
                self.app.log.debug("%s is checked." % tool)
                for t in self.tools:
                    if t != tool:
                        self.tools[t]["button"].setChecked(False)

                self.active_tool = self.tools[tool]["constructor"](self)
            else:
                self.app.log.debug("%s is NOT checked." % tool)
                for t in self.tools:
                    self.tools[t]["button"].setChecked(False)

                self.select_tool('select')
                self.active_tool = FCSelect(self)

    def draw_tool_path(self):
        self.select_tool('path')
        return

    def draw_tool_rectangle(self):
        self.select_tool('rectangle')
        return

    def on_grid_toggled(self):
        self.toolbar_tool_toggle("grid_snap")

        # make sure that the cursor shape is enabled/disabled, too
        if self.options['grid_snap'] is True:
            self.app.app_cursor.enabled = True
        else:
            self.app.app_cursor.enabled = False

    def on_canvas_click(self, event):
        """
        event.x and .y have canvas coordinates
        event.xdaya and .ydata have plot coordinates

        :param event: Event object dispatched by Matplotlib
        :return: None
        """

        self.pos = self.canvas.vispy_canvas.translate_coords(event.pos)

        if self.app.grid_status() == True:
            self.pos = self.app.geo_editor.snap(self.pos[0], self.pos[1])
            self.app.app_cursor.enabled = True
            # Update cursor
            self.app.app_cursor.set_data(np.asarray([(self.pos[0], self.pos[1])]), symbol='++', edge_color='black',
                                         size=20)
        else:
            self.pos = (self.pos[0], self.pos[1])
            self.app.app_cursor.enabled = False

        if event.button == 1:
            self.app.ui.rel_position_label.setText("<b>Dx</b>: %.4f&nbsp;&nbsp;  <b>Dy</b>: "
                                                   "%.4f&nbsp;&nbsp;&nbsp;&nbsp;" % (0, 0))

            modifiers = QtWidgets.QApplication.keyboardModifiers()
            # If the SHIFT key is pressed when LMB is clicked then the coordinates are copied to clipboard
            if modifiers == QtCore.Qt.ShiftModifier:
                self.app.clipboard.setText(
                    self.app.defaults["global_point_clipboard_format"] % (self.pos[0], self.pos[1]))
                return

            # Selection with left mouse button
            if self.active_tool is not None and event.button is 1:

                # Dispatch event to active_tool
                self.active_tool.click(self.snap(self.pos[0], self.pos[1]))

                # If it is a shape generating tool
                if isinstance(self.active_tool, FCShapeTool) and self.active_tool.complete:
                    self.on_shape_complete()

                    if isinstance(self.active_tool, FCText):
                        self.select_tool("select")
                    else:
                        self.select_tool(self.active_tool.name)

                if isinstance(self.active_tool, FCSelect):
                    # self.app.log.debug("Replotting after click.")
                    self.replot()
            else:
                self.app.log.debug("No active tool to respond to click!")

    def on_canvas_move(self, event):
        """
        Called on 'mouse_move' event
        event.pos have canvas screen coordinates

        :param event: Event object dispatched by VisPy SceneCavas
        :return: None
        """
        pos = self.canvas.vispy_canvas.translate_coords(event.pos)
        event.xdata, event.ydata = pos[0], pos[1]

        self.x = event.xdata
        self.y = event.ydata

        self.app.ui.popMenu.mouse_is_panning = False

        # if the RMB is clicked and mouse is moving over plot then 'panning_action' is True
        if event.button == 2:
            if event.is_dragging:
                self.app.ui.popMenu.mouse_is_panning = True
                # return
            else:
                self.app.ui.popMenu.mouse_is_panning = False

        if self.active_tool is None:
            return

        try:
            x = float(event.xdata)
            y = float(event.ydata)
        except TypeError:
            return

        # ### Snap coordinates ###
        if self.app.grid_status() == True:
            x, y = self.snap(x, y)
            self.app.app_cursor.enabled = True
            # Update cursor
            self.app.app_cursor.set_data(np.asarray([(x, y)]), symbol='++', edge_color='black', size=20)
        else:
            self.app.app_cursor.enabled = False

        self.snap_x = x
        self.snap_y = y

        # update the position label in the infobar since the APP mouse event handlers are disconnected
        self.app.ui.position_label.setText("&nbsp;&nbsp;&nbsp;&nbsp;<b>X</b>: %.4f&nbsp;&nbsp;   "
                                       "<b>Y</b>: %.4f" % (x, y))

        if self.pos is None:
            self.pos = (0, 0)
        dx = x - self.pos[0]
        dy = y - self.pos[1]

        # update the reference position label in the infobar since the APP mouse event handlers are disconnected
        self.app.ui.rel_position_label.setText("<b>Dx</b>: %.4f&nbsp;&nbsp;  <b>Dy</b>: "
                                           "%.4f&nbsp;&nbsp;&nbsp;&nbsp;" % (dx, dy))

        if event.button == 1 and event.is_dragging and isinstance(self.active_tool, FCEraser):
            pass
        else:
            # ### Utility geometry (animated) ###
            geo = self.active_tool.utility_geometry(data=(x, y))
            if isinstance(geo, DrawToolShape) and geo.geo is not None:
                # Remove any previous utility shape
                self.tool_shape.clear(update=True)
                self.draw_utility_geometry(geo=geo)

        # ### Selection area on canvas section ###
        dx = pos[0] - self.pos[0]
        if event.is_dragging and event.button == 1:
            self.app.delete_selection_shape()
            if dx < 0:
                self.app.draw_moving_selection_shape((self.pos[0], self.pos[1]), (x, y),
                     color=self.app.defaults["global_alt_sel_line"],
                     face_color=self.app.defaults['global_alt_sel_fill'])
                self.app.selection_type = False
            else:
                self.app.draw_moving_selection_shape((self.pos[0], self.pos[1]), (x, y))
                self.app.selection_type = True
        else:
            self.app.selection_type = None

    def on_geo_click_release(self, event):
        pos_canvas = self.canvas.vispy_canvas.translate_coords(event.pos)

        if self.app.grid_status() == True:
            pos = self.snap(pos_canvas[0], pos_canvas[1])
        else:
            pos = (pos_canvas[0], pos_canvas[1])

        # if the released mouse button was RMB then test if it was a panning motion or not, if not it was a context
        # canvas menu
        try:
            # if the released mouse button was LMB then test if we had a right-to-left selection or a left-to-right
            # selection and then select a type of selection ("enclosing" or "touching")
            if event.button == 1:  # left click
                if self.app.selection_type is not None:
                    self.draw_selection_area_handler(self.pos, pos, self.app.selection_type)
                    self.app.selection_type = None
                elif isinstance(self.active_tool, FCSelect):
                    # Dispatch event to active_tool
                    # msg = self.active_tool.click(self.snap(event.xdata, event.ydata))
                    self.active_tool.click_release((self.pos[0], self.pos[1]))
                    # self.app.inform.emit(msg)
                    self.replot()
            elif event.button == 2:  # right click
                if self.app.ui.popMenu.mouse_is_panning == False:
                    if self.in_action is False:
                        try:
                            QtGui.QGuiApplication.restoreOverrideCursor()
                        except Exception as e:
                            pass

                        if self.active_tool.complete is False and not isinstance(self.active_tool, FCSelect):
                            self.active_tool.complete = True
                            self.in_action = False
                            self.delete_utility_geometry()
                            self.app.inform.emit(_("[success] Done."))
                            self.select_tool('select')
                        else:
                            self.app.cursor = QtGui.QCursor()
                            self.app.populate_cmenu_grids()
                            self.app.ui.popMenu.popup(self.app.cursor.pos())
                    else:
                        # if right click on canvas and the active tool need to be finished (like Path or Polygon)
                        # right mouse click will finish the action
                        if isinstance(self.active_tool, FCShapeTool):
                            self.active_tool.click(self.snap(self.x, self.y))
                            self.active_tool.make()
                            if self.active_tool.complete:
                                self.on_shape_complete()
                                self.app.inform.emit(_("[success] Done."))
                                self.select_tool(self.active_tool.name)
        except Exception as e:
            log.warning("Error: %s" % str(e))
            return

    def draw_selection_area_handler(self, start_pos, end_pos, sel_type):
        """

        :param start_pos: mouse position when the selection LMB click was done
        :param end_pos: mouse position when the left mouse button is released
        :param sel_type: if True it's a left to right selection (enclosure), if False it's a 'touch' selection
        :return:
        """
        poly_selection = Polygon([start_pos, (end_pos[0], start_pos[1]), end_pos, (start_pos[0], end_pos[1])])

        self.app.delete_selection_shape()
        for obj in self.storage.get_objects():
            if (sel_type is True and poly_selection.contains(obj.geo)) or (sel_type is False and
                                                                           poly_selection.intersects(obj.geo)):
                    if self.key == self.app.defaults["global_mselect_key"]:
                        if obj in self.selected:
                            self.selected.remove(obj)
                        else:
                            # add the object to the selected shapes
                            self.selected.append(obj)
                    else:
                        if obj not in self.selected:
                            self.selected.append(obj)
        self.replot()

    def draw_utility_geometry(self, geo):
        # Add the new utility shape
        try:
            # this case is for the Font Parse
            for el in list(geo.geo):
                if type(el) == MultiPolygon:
                    for poly in el:
                        self.tool_shape.add(
                            shape=poly,
                            color=(self.app.defaults["global_draw_color"] + '80'),
                            update=False,
                            layer=0,
                            tolerance=None
                        )
                elif type(el) == MultiLineString:
                    for linestring in el:
                        self.tool_shape.add(
                            shape=linestring,
                            color=(self.app.defaults["global_draw_color"] + '80'),
                            update=False,
                            layer=0,
                            tolerance=None
                        )
                else:
                    self.tool_shape.add(
                        shape=el,
                        color=(self.app.defaults["global_draw_color"] + '80'),
                        update=False,
                        layer=0,
                        tolerance=None
                    )
        except TypeError:
            self.tool_shape.add(
                shape=geo.geo, color=(self.app.defaults["global_draw_color"] + '80'),
                update=False, layer=0, tolerance=None)

        self.tool_shape.redraw()

    def on_delete_btn(self):
        self.delete_selected()
        self.replot()

    def delete_selected(self):
        tempref = [s for s in self.selected]
        for shape in tempref:
            self.delete_shape(shape)
        self.selected = []

    def delete_shape(self, shape):

        if shape in self.utility:
            self.utility.remove(shape)
            return

        self.storage.remove(shape)
        if shape in self.selected:
            self.selected.remove(shape)  # TODO: Check performance

    def on_move(self):
        # if not self.selected:
        #     self.app.inform.emit(_("[WARNING_NOTCL] Move cancelled. No shape selected."))
        #     return
        self.app.ui.geo_move_btn.setChecked(True)
        self.on_tool_select('move')

    def on_move_click(self):
        self.on_move()
        self.active_tool.set_origin(self.snap(self.x, self.y))

    def on_copy_click(self):
        if not self.selected:
            self.app.inform.emit(_("[WARNING_NOTCL] Copy cancelled. No shape selected."))
            return

        self.app.ui.geo_copy_btn.setChecked(True)
        self.app.geo_editor.on_tool_select('copy')
        self.app.geo_editor.active_tool.set_origin(self.app.geo_editor.snap(
            self.app.geo_editor.x, self.app.geo_editor.y))
        self.app.inform.emit(_("Click on target point."))

    def on_corner_snap(self):
        self.app.ui.corner_snap_btn.trigger()

    def get_selected(self):
        """
        Returns list of shapes that are selected in the editor.

        :return: List of shapes.
        """
        # return [shape for shape in self.shape_buffer if shape["selected"]]
        return self.selected

    def plot_shape(self, geometry=None, color='black', linewidth=1):
        """
        Plots a geometric object or list of objects without rendering. Plotted objects
        are returned as a list. This allows for efficient/animated rendering.

        :param geometry: Geometry to be plotted (Any Shapely.geom kind or list of such)
        :param color: Shape color
        :param linewidth: Width of lines in # of pixels.
        :return: List of plotted elements.
        """
        plot_elements = []

        if geometry is None:
            geometry = self.active_tool.geometry

        try:
            for geo in geometry:
                plot_elements += self.plot_shape(geometry=geo, color=color, linewidth=linewidth)

        # Non-iterable
        except TypeError:

            # DrawToolShape
            if isinstance(geometry, DrawToolShape):
                plot_elements += self.plot_shape(geometry=geometry.geo, color=color, linewidth=linewidth)

            # Polygon: Descend into exterior and each interior.
            if type(geometry) == Polygon:
                plot_elements += self.plot_shape(geometry=geometry.exterior, color=color, linewidth=linewidth)
                plot_elements += self.plot_shape(geometry=geometry.interiors, color=color, linewidth=linewidth)

            if type(geometry) == LineString or type(geometry) == LinearRing:
                plot_elements.append(self.shapes.add(shape=geometry, color=color, layer=0,
                                                     tolerance=self.fcgeometry.drawing_tolerance))

            if type(geometry) == Point:
                pass

        return plot_elements

    def plot_all(self):
        """
        Plots all shapes in the editor.

        :return: None
        :rtype: None
        """
        # self.app.log.debug("plot_all()")
        self.shapes.clear(update=True)

        for shape in self.storage.get_objects():

            if shape.geo is None:  # TODO: This shouldn't have happened
                continue

            if shape in self.selected:
                self.plot_shape(geometry=shape.geo, color=self.app.defaults['global_sel_draw_color'], linewidth=2)
                continue

            self.plot_shape(geometry=shape.geo, color=self.app.defaults['global_draw_color'])

        for shape in self.utility:
            self.plot_shape(geometry=shape.geo, linewidth=1)
            continue

        self.shapes.redraw()

    def replot(self):
        self.plot_all()

    def on_shape_complete(self):
        self.app.log.debug("on_shape_complete()")

        # Add shape
        self.add_shape(self.active_tool.geometry)

        # Remove any utility shapes
        self.delete_utility_geometry()
        self.tool_shape.clear(update=True)

        # Replot and reset tool.
        self.replot()
        # self.active_tool = type(self.active_tool)(self)

    @staticmethod
    def make_storage():

        # Shape storage.
        storage = FlatCAMRTreeStorage()
        storage.get_points = DrawToolShape.get_pts

        return storage

    def select_tool(self, toolname):
        """
        Selects a drawing tool. Impacts the object and GUI.

        :param toolname: Name of the tool.
        :return: None
        """
        self.tools[toolname]["button"].setChecked(True)
        self.on_tool_select(toolname)

    def set_selected(self, shape):

        # Remove and add to the end.
        if shape in self.selected:
            self.selected.remove(shape)

        self.selected.append(shape)

    def set_unselected(self, shape):
        if shape in self.selected:
            self.selected.remove(shape)

    def snap(self, x, y):
        """
        Adjusts coordinates to snap settings.

        :param x: Input coordinate X
        :param y: Input coordinate Y
        :return: Snapped (x, y)
        """

        snap_x, snap_y = (x, y)
        snap_distance = Inf

        # # ## Object (corner?) snap
        # # ## No need for the objects, just the coordinates
        # # ## in the index.
        if self.options["corner_snap"]:
            try:
                nearest_pt, shape = self.storage.nearest((x, y))

                nearest_pt_distance = distance((x, y), nearest_pt)
                if nearest_pt_distance <= float(self.options["global_snap_max"]):
                    snap_distance = nearest_pt_distance
                    snap_x, snap_y = nearest_pt
            except (StopIteration, AssertionError):
                pass

        # # ## Grid snap
        if self.options["grid_snap"]:
            if self.options["global_gridx"] != 0:
                snap_x_ = round(x / self.options["global_gridx"]) * self.options['global_gridx']
            else:
                snap_x_ = x

            # If the Grid_gap_linked on Grid Toolbar is checked then the snap distance on GridY entry will be ignored
            # and it will use the snap distance from GridX entry
            if self.app.ui.grid_gap_link_cb.isChecked():
                if self.options["global_gridx"] != 0:
                    snap_y_ = round(y / self.options["global_gridx"]) * self.options['global_gridx']
                else:
                    snap_y_ = y
            else:
                if self.options["global_gridy"] != 0:
                    snap_y_ = round(y / self.options["global_gridy"]) * self.options['global_gridy']
                else:
                    snap_y_ = y
            nearest_grid_distance = distance((x, y), (snap_x_, snap_y_))
            if nearest_grid_distance < snap_distance:
                snap_x, snap_y = (snap_x_, snap_y_)

        return snap_x, snap_y

    def update_fcgeometry(self, fcgeometry):
        """
        Transfers the geometry tool shape buffer to the selected geometry
        object. The geometry already in the object are removed.

        :param fcgeometry: FlatCAMGeometry
        :return: None
        """
        if self.multigeo_tool:
            fcgeometry.tools[self.multigeo_tool]['solid_geometry'] = []
            # for shape in self.shape_buffer:
            for shape in self.storage.get_objects():
                fcgeometry.tools[self.multigeo_tool]['solid_geometry'].append(shape.geo)
            self.multigeo_tool = None
        else:
            fcgeometry.solid_geometry = []
            # for shape in self.shape_buffer:
            for shape in self.storage.get_objects():
                fcgeometry.solid_geometry.append(shape.geo)

    def update_options(self, obj):
        if self.paint_tooldia:
            obj.options['cnctooldia'] = deepcopy(str(self.paint_tooldia))
            self.paint_tooldia = None
            return True
        else:
            return False

    def union(self):
        """
        Makes union of selected polygons. Original polygons
        are deleted.

        :return: None.
        """

        results = unary_union([t.geo for t in self.get_selected()])

        # Delete originals.
        for_deletion = [s for s in self.get_selected()]
        for shape in for_deletion:
            self.delete_shape(shape)

        # Selected geometry is now gone!
        self.selected = []

        self.add_shape(DrawToolShape(results))

        self.replot()

    def intersection_2(self):
        """
        Makes intersection of selected polygons. Original polygons are deleted.

        :return: None
        """

        geo_shapes = self.get_selected()

        try:
            results = geo_shapes[0].geo
        except Exception as e:
            log.debug("FlatCAMGeoEditor.intersection() --> %s" % str(e))
            self.app.inform.emit(
                _("[WARNING_NOTCL] A selection of at least 2 geo items is required to do Intersection."))
            self.select_tool('select')
            return

        for shape_el in geo_shapes[1:]:
            results = results.intersection(shape_el.geo)

        # Delete originals.
        for_deletion = [s for s in self.get_selected()]
        for shape_el in for_deletion:
            self.delete_shape(shape_el)

        # Selected geometry is now gone!
        self.selected = []

        self.add_shape(DrawToolShape(results))

        self.replot()

    def intersection(self):
        """
        Makes intersection of selected polygons. Original polygons are deleted.

        :return: None
        """

        geo_shapes = self.get_selected()
        results = []
        intact = []

        try:
            intersector = geo_shapes[0].geo
        except Exception as e:
            log.debug("FlatCAMGeoEditor.intersection() --> %s" % str(e))
            self.app.inform.emit(
                _("[WARNING_NOTCL] A selection of at least 2 geo items is required to do Intersection."))
            self.select_tool('select')
            return

        for shape_el in geo_shapes[1:]:
            if intersector.intersects(shape_el.geo):
                results.append(intersector.intersection(shape_el.geo))
            else:
                intact.append(shape_el)

        if len(results) != 0:
            # Delete originals.
            for_deletion = [s for s in self.get_selected()]
            for shape_el in for_deletion:
                if shape_el not in intact:
                    self.delete_shape(shape_el)

            for geo in results:
                self.add_shape(DrawToolShape(geo))

        # Selected geometry is now gone!
        self.selected = []
        self.replot()

    def subtract(self):
        selected = self.get_selected()
        try:
            tools = selected[1:]
            toolgeo = unary_union([shp.geo for shp in tools]).buffer(0.0000001)
            target = selected[0].geo
            target = target.buffer(0.0000001)
            result = target.difference(toolgeo)

            for_deletion = [s for s in self.get_selected()]
            for shape in for_deletion:
                self.delete_shape(shape)

            self.add_shape(DrawToolShape(result))

            self.replot()
        except Exception as e:
            log.debug(str(e))

    def subtract_2(self):
        selected = self.get_selected()
        try:
            tools = selected[1:]
            toolgeo = unary_union([shp.geo for shp in tools])
            result = selected[0].geo.difference(toolgeo)

            self.delete_shape(selected[0])
            self.add_shape(DrawToolShape(result))

            self.replot()
        except Exception as e:
            log.debug(str(e))

    def cutpath(self):
        selected = self.get_selected()
        tools = selected[1:]
        toolgeo = unary_union([shp.geo for shp in tools])

        target = selected[0]
        if type(target.geo) == Polygon:
            for ring in poly2rings(target.geo):
                self.add_shape(DrawToolShape(ring.difference(toolgeo)))
        elif type(target.geo) == LineString or type(target.geo) == LinearRing:
            self.add_shape(DrawToolShape(target.geo.difference(toolgeo)))
        elif type(target.geo) == MultiLineString:
            try:
                for linestring in target.geo:
                    self.add_shape(DrawToolShape(linestring.difference(toolgeo)))
            except Exception as e:
                self.app.log.warning("Current LinearString does not intersect the target. %s" % str(e))
        else:
            self.app.log.warning("Not implemented. Object type: %s" % str(type(target.geo)))
            return

        self.delete_shape(target)
        self.replot()

    def buffer(self, buf_distance, join_style):
        selected = self.get_selected()

        if buf_distance < 0:
            self.app.inform.emit(
               _("[ERROR_NOTCL] Negative buffer value is not accepted. "
                 "Use Buffer interior to generate an 'inside' shape"))

            # deselect everything
            self.selected = []
            self.replot()
            return 'fail'

        if len(selected) == 0:
            self.app.inform.emit(_("[WARNING_NOTCL] Nothing selected for buffering."))
            return 'fail'

        if not isinstance(buf_distance, float):
            self.app.inform.emit(_("[WARNING_NOTCL] Invalid distance for buffering."))

            # deselect everything
            self.selected = []
            self.replot()
            return 'fail'

        results = []
        for t in selected:
            if isinstance(t.geo, Polygon) and not t.geo.is_empty:
                results.append((t.geo.exterior).buffer(
                    buf_distance - 1e-10,
                    resolution=int(int(self.app.defaults["geometry_circle_steps"]) / 4),
                    join_style=join_style)
                )
            else:
                results.append(t.geo.buffer(
                    buf_distance - 1e-10,
                    resolution=int(int(self.app.defaults["geometry_circle_steps"]) / 4),
                    join_style=join_style)
                )

        if not results:
            self.app.inform.emit(_("[ERROR_NOTCL] Failed, the result is empty. Choose a different buffer value."))
            # deselect everything
            self.selected = []
            self.replot()
            return 'fail'

        for sha in results:
            self.add_shape(DrawToolShape(sha))

        self.replot()
        self.app.inform.emit(_("[success] Full buffer geometry created."))

    def buffer_int(self, buf_distance, join_style):
        selected = self.get_selected()

        if buf_distance < 0:
            self.app.inform.emit(
                _("[ERROR_NOTCL] Negative buffer value is not accepted.")
            )
            # deselect everything
            self.selected = []
            self.replot()
            return 'fail'

        if len(selected) == 0:
            self.app.inform.emit(_("[WARNING_NOTCL] Nothing selected for buffering."))
            return 'fail'

        if not isinstance(buf_distance, float):
            self.app.inform.emit(_("[WARNING_NOTCL] Invalid distance for buffering."))
            # deselect everything
            self.selected = []
            self.replot()
            return 'fail'

        results = []
        for t in selected:
            if isinstance(t.geo, LinearRing):
                t.geo = Polygon(t.geo)

            if isinstance(t.geo, Polygon) and not t.geo.is_empty:
                results.append((t.geo).buffer(
                    -buf_distance + 1e-10,
                    resolution=int(int(self.app.defaults["geometry_circle_steps"]) / 4),
                    join_style=join_style)
                )

        if not results:
            self.app.inform.emit(_("[ERROR_NOTCL] Failed, the result is empty. Choose a smaller buffer value."))
            # deselect everything
            self.selected = []
            self.replot()
            return 'fail'

        for sha in results:
            self.add_shape(DrawToolShape(sha))

        self.replot()
        self.app.inform.emit(_("[success] Interior buffer geometry created."))

    def buffer_ext(self, buf_distance, join_style):
        selected = self.get_selected()

        if buf_distance < 0:
            self.app.inform.emit(_("[ERROR_NOTCL] Negative buffer value is not accepted. "
                                   "Use Buffer interior to generate an 'inside' shape"))
            # deselect everything
            self.selected = []
            self.replot()
            return

        if len(selected) == 0:
            self.app.inform.emit(_("[WARNING_NOTCL] Nothing selected for buffering."))
            return

        if not isinstance(buf_distance, float):
            self.app.inform.emit(_("[WARNING_NOTCL] Invalid distance for buffering."))
            # deselect everything
            self.selected = []
            self.replot()
            return

        results = []
        for t in selected:
            if isinstance(t.geo, LinearRing):
                t.geo = Polygon(t.geo)

            if isinstance(t.geo, Polygon) and not t.geo.is_empty:
                results.append((t.geo).buffer(
                    buf_distance,
                    resolution=int(int(self.app.defaults["geometry_circle_steps"]) / 4),
                    join_style=join_style)
                )

        if not results:
            self.app.inform.emit(_("[ERROR_NOTCL] Failed, the result is empty. Choose a different buffer value."))
            # deselect everything
            self.selected = []
            self.replot()
            return

        for sha in results:
            self.add_shape(DrawToolShape(sha))

        self.replot()
        self.app.inform.emit(_("[success] Exterior buffer geometry created."))

    # def paint(self, tooldia, overlap, margin, method):
    #     selected = self.get_selected()
    #
    #     if len(selected) == 0:
    #         self.app.inform.emit("[WARNING] Nothing selected for painting.")
    #         return
    #
    #     for param in [tooldia, overlap, margin]:
    #         if not isinstance(param, float):
    #             param_name = [k for k, v in locals().items() if v is param][0]
    #             self.app.inform.emit("[WARNING] Invalid value for {}".format(param))
    #
    #     # Todo: Check for valid method.
    #
    #     # Todo: This is the 3rd implementation on painting polys... try to consolidate
    #
    #     results = []
    #
    #     def recurse(geo):
    #         try:
    #             for subg in geo:
    #                 for subsubg in recurse(subg):
    #                     yield subsubg
    #         except TypeError:
    #             if isinstance(geo, LinearRing):
    #                 yield geo
    #
    #         raise StopIteration
    #
    #     for geo in selected:
    #         print(type(geo.geo))
    #
    #         local_results = []
    #         for poly in recurse(geo.geo):
    #             if method == "seed":
    #                 # Type(cp) == FlatCAMRTreeStorage | None
    #                 cp = Geometry.clear_polygon2(poly.buffer(-margin),
    #                                              tooldia, overlap=overlap)
    #
    #             else:
    #                 # Type(cp) == FlatCAMRTreeStorage | None
    #                 cp = Geometry.clear_polygon(poly.buffer(-margin),
    #                                             tooldia, overlap=overlap)
    #
    #             if cp is not None:
    #                 local_results += list(cp.get_objects())
    #
    #             results.append(cascaded_union(local_results))
    #
    #     # This is a dirty patch:
    #     for r in results:
    #         self.add_shape(DrawToolShape(r))
    #
    #     self.replot()

    def paint(self, tooldia, overlap, margin, connect, contour, method):

        self.paint_tooldia = tooldia

        selected = self.get_selected()

        if len(selected) == 0:
            self.app.inform.emit(_("[WARNING_NOTCL] Nothing selected for painting."))
            return

        for param in [tooldia, overlap, margin]:
            if not isinstance(param, float):
                param_name = [k for k, v in locals().items() if v is param][0]
                self.app.inform.emit(_("[WARNING] Invalid value for {}").format(param))

        results = []

        if overlap >= 1:
            self.app.inform.emit(
                _("[ERROR_NOTCL] Could not do Paint. Overlap value has to be less than 1.00 (100%)."))
            return

        def recurse(geometry, reset=True):
            """
            Creates a list of non-iterable linear geometry objects.
            Results are placed in self.flat_geometry

            :param geometry: Shapely type or list or list of list of such.
            :param reset: Clears the contents of self.flat_geometry.
            """

            if geometry is None:
                return

            if reset:
                self.flat_geo = []

            # If iterable, expand recursively.
            try:
                for geo_el in geometry:
                    if geo_el is not None:
                        recurse(geometry=geo_el, reset=False)

            # Not iterable, do the actual indexing and add.
            except TypeError:
                self.flat_geo.append(geometry)

            return self.flat_geo

        for geo in selected:

            local_results = []
            for geo_obj in recurse(geo.geo):
                try:
                    if type(geo_obj) == Polygon:
                        poly_buf = geo_obj.buffer(-margin)
                    else:
                        poly_buf = Polygon(geo_obj).buffer(-margin)

                    if method == "seed":
                        cp = Geometry.clear_polygon2(poly_buf,
                                                     tooldia, self.app.defaults["geometry_circle_steps"],
                                                     overlap=overlap, contour=contour, connect=connect)
                    elif method == "lines":
                        cp = Geometry.clear_polygon3(poly_buf,
                                                     tooldia, self.app.defaults["geometry_circle_steps"],
                                                     overlap=overlap, contour=contour, connect=connect)

                    else:
                        cp = Geometry.clear_polygon(poly_buf,
                                                    tooldia, self.app.defaults["geometry_circle_steps"],
                                                    overlap=overlap, contour=contour, connect=connect)

                    if cp is not None:
                        local_results += list(cp.get_objects())
                except Exception as e:
                    log.debug("Could not Paint the polygons. %s" % str(e))
                    self.app.inform.emit(
                        _("[ERROR] Could not do Paint. Try a different combination of parameters. "
                          "Or a different method of Paint\n%s") % str(e))
                    return

                # add the result to the results list
                results.append(cascaded_union(local_results))

        # This is a dirty patch:
        for r in results:
            self.add_shape(DrawToolShape(r))
        self.app.inform.emit(
            _("[success] Paint done."))
        self.replot()


def distance(pt1, pt2):
    return sqrt((pt1[0] - pt2[0]) ** 2 + (pt1[1] - pt2[1]) ** 2)


def mag(vec):
    return sqrt(vec[0] ** 2 + vec[1] ** 2)


def poly2rings(poly):
    return [poly.exterior] + [interior for interior in poly.interiors]


def get_shapely_list_bounds(geometry_list):
    xmin = Inf
    ymin = Inf
    xmax = -Inf
    ymax = -Inf

    for gs in geometry_list:
        try:
            gxmin, gymin, gxmax, gymax = gs.bounds
            xmin = min([xmin, gxmin])
            ymin = min([ymin, gymin])
            xmax = max([xmax, gxmax])
            ymax = max([ymax, gymax])
        except Exception as e:
            log.warning("DEVELOPMENT: Tried to get bounds of empty geometry. --> %s" % str(e))

    return [xmin, ymin, xmax, ymax]