FlatCAM/AppTools/ToolIsolation.py

# ##########################################################
# FlatCAM: 2D Post-processing for Manufacturing            #
# File by:  Marius Adrian Stanciu (c)                      #
# Date:     5/25/2020                                      #
# License:  MIT Licence                                    #
# ##########################################################

from PyQt5 import QtWidgets, QtCore, QtGui

from AppTool import AppTool
from AppGUI.GUIElements import FCCheckBox, FCDoubleSpinner, RadioSet, FCTable, FCInputDialog, FCButton, \
    FCComboBox, OptionalHideInputSection, FCSpinner
from AppParsers.ParseGerber import Gerber

from copy import deepcopy

import numpy as np
import math

from shapely.ops import cascaded_union
from shapely.geometry import MultiPolygon, Polygon, MultiLineString, LineString, LinearRing

from matplotlib.backend_bases import KeyEvent as mpl_key_event

import logging
import gettext
import AppTranslation as fcTranslate
import builtins

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

log = logging.getLogger('base')


class ToolIsolation(AppTool, Gerber):
    toolName = _("Isolation Tool")

    def __init__(self, app):
        self.app = app
        self.decimals = self.app.decimals

        AppTool.__init__(self, app)
        Gerber.__init__(self, steps_per_circle=self.app.defaults["gerber_circle_steps"])

        self.tools_frame = QtWidgets.QFrame()
        self.tools_frame.setContentsMargins(0, 0, 0, 0)
        self.layout.addWidget(self.tools_frame)
        self.tools_box = QtWidgets.QVBoxLayout()
        self.tools_box.setContentsMargins(0, 0, 0, 0)
        self.tools_frame.setLayout(self.tools_box)

        self.title_box = QtWidgets.QHBoxLayout()
        self.tools_box.addLayout(self.title_box)

        # ## Title
        title_label = QtWidgets.QLabel("%s" % self.toolName)
        title_label.setStyleSheet("""
                        QLabel
                        {
                            font-size: 16px;
                            font-weight: bold;
                        }
                        """)
        title_label.setToolTip(
            _("Create a Geometry object with\n"
              "toolpaths to cut around polygons.")
        )

        self.title_box.addWidget(title_label)

        # App Level label
        self.level = QtWidgets.QLabel("")
        self.level.setToolTip(
            _(
                "BASIC is suitable for a beginner. Many parameters\n"
                "are hidden from the user in this mode.\n"
                "ADVANCED mode will make available all parameters.\n\n"
                "To change the application LEVEL, go to:\n"
                "Edit -> Preferences -> General and check:\n"
                "'APP. LEVEL' radio button."
            )
        )
        self.level.setAlignment(QtCore.Qt.AlignRight | QtCore.Qt.AlignVCenter)
        self.title_box.addWidget(self.level)

        # Grid Layout
        grid0 = QtWidgets.QGridLayout()
        grid0.setColumnStretch(0, 0)
        grid0.setColumnStretch(1, 1)
        self.tools_box.addLayout(grid0)

        self.obj_combo_label = QtWidgets.QLabel('<b>%s</b>:' % _("GERBER"))
        self.obj_combo_label.setToolTip(
            _("Gerber object for isolation routing.")
        )

        grid0.addWidget(self.obj_combo_label, 0, 0, 1, 2)

        # ################################################
        # ##### The object to be copper cleaned ##########
        # ################################################
        self.object_combo = FCComboBox()
        self.object_combo.setModel(self.app.collection)
        self.object_combo.setRootModelIndex(self.app.collection.index(0, 0, QtCore.QModelIndex()))
        # self.object_combo.setCurrentIndex(1)
        self.object_combo.is_last = True

        grid0.addWidget(self.object_combo, 1, 0, 1, 2)

        separator_line = QtWidgets.QFrame()
        separator_line.setFrameShape(QtWidgets.QFrame.HLine)
        separator_line.setFrameShadow(QtWidgets.QFrame.Sunken)
        grid0.addWidget(separator_line, 2, 0, 1, 2)

        # ### Tools ## ##
        self.tools_table_label = QtWidgets.QLabel('<b>%s</b>' % _('Tools Table'))
        self.tools_table_label.setToolTip(
            _("Tools pool from which the algorithm\n"
              "will pick the ones used for copper clearing.")
        )
        grid0.addWidget(self.tools_table_label, 3, 0, 1, 2)

        self.tools_table = FCTable()
        grid0.addWidget(self.tools_table, 4, 0, 1, 2)

        self.tools_table.setColumnCount(4)
        # 3rd column is reserved (and hidden) for the tool ID
        self.tools_table.setHorizontalHeaderLabels(['#', _('Diameter'), _('TT'), ''])
        self.tools_table.setColumnHidden(3, True)
        self.tools_table.setSortingEnabled(False)
        # self.tools_table.setSelectionBehavior(QtWidgets.QAbstractItemView.SelectRows)

        self.tools_table.horizontalHeaderItem(0).setToolTip(
            _("This is the Tool Number.\n"
              "Non copper clearing will start with the tool with the biggest \n"
              "diameter, continuing until there are no more tools.\n"
              "Only tools that create NCC clearing geometry will still be present\n"
              "in the resulting geometry. This is because with some tools\n"
              "this function will not be able to create painting geometry.")
        )
        self.tools_table.horizontalHeaderItem(1).setToolTip(
            _("Tool Diameter. It's value (in current FlatCAM units)\n"
              "is the cut width into the material."))

        self.tools_table.horizontalHeaderItem(2).setToolTip(
            _("The Tool Type (TT) can be:\n"
              "- Circular with 1 ... 4 teeth -> it is informative only. Being circular,\n"
              "the cut width in material is exactly the tool diameter.\n"
              "- Ball -> informative only and make reference to the Ball type endmill.\n"
              "- V-Shape -> it will disable Z-Cut parameter in the resulting geometry UI form\n"
              "and enable two additional UI form fields in the resulting geometry: V-Tip Dia and\n"
              "V-Tip Angle. Adjusting those two values will adjust the Z-Cut parameter such\n"
              "as the cut width into material will be equal with the value in the Tool Diameter\n"
              "column of this table.\n"
              "Choosing the 'V-Shape' Tool Type automatically will select the Operation Type\n"
              "in the resulting geometry as Isolation."))

        grid1 = QtWidgets.QGridLayout()
        grid1.setColumnStretch(0, 0)
        grid1.setColumnStretch(1, 1)
        self.tools_box.addLayout(grid1)

        # Tool order
        self.ncc_order_label = QtWidgets.QLabel('%s:' % _('Tool order'))
        self.ncc_order_label.setToolTip(_("This set the way that the tools in the tools table are used.\n"
                                          "'No' --> means that the used order is the one in the tool table\n"
                                          "'Forward' --> means that the tools will be ordered from small to big\n"
                                          "'Reverse' --> means that the tools will ordered from big to small\n\n"
                                          "WARNING: using rest machining will automatically set the order\n"
                                          "in reverse and disable this control."))

        self.order_radio = RadioSet([{'label': _('No'), 'value': 'no'},
                                     {'label': _('Forward'), 'value': 'fwd'},
                                     {'label': _('Reverse'), 'value': 'rev'}])

        grid1.addWidget(self.ncc_order_label, 1, 0)
        grid1.addWidget(self.order_radio, 1, 1)

        separator_line = QtWidgets.QFrame()
        separator_line.setFrameShape(QtWidgets.QFrame.HLine)
        separator_line.setFrameShadow(QtWidgets.QFrame.Sunken)
        grid1.addWidget(separator_line, 2, 0, 1, 2)

        # #############################################################
        # ############### Tool selection ##############################
        # #############################################################

        self.grid3 = QtWidgets.QGridLayout()
        self.grid3.setColumnStretch(0, 0)
        self.grid3.setColumnStretch(1, 1)
        self.tools_box.addLayout(self.grid3)

        self.tool_sel_label = QtWidgets.QLabel('<b>%s</b>' % _("New Tool"))
        self.grid3.addWidget(self.tool_sel_label, 1, 0, 1, 2)

        # Tool Type Radio Button
        self.tool_type_label = QtWidgets.QLabel('%s:' % _('Tool Type'))
        self.tool_type_label.setToolTip(
            _("Default tool type:\n"
              "- 'V-shape'\n"
              "- Circular")
        )

        self.tool_type_radio = RadioSet([{'label': _('V-shape'), 'value': 'V'},
                                         {'label': _('Circular'), 'value': 'C1'}])
        self.tool_type_radio.setToolTip(
            _("Default tool type:\n"
              "- 'V-shape'\n"
              "- Circular")
        )
        self.tool_type_radio.setObjectName("i_tool_type")

        self.grid3.addWidget(self.tool_type_label, 2, 0)
        self.grid3.addWidget(self.tool_type_radio, 2, 1)

        # Tip Dia
        self.tipdialabel = QtWidgets.QLabel('%s:' % _('V-Tip Dia'))
        self.tipdialabel.setToolTip(
            _("The tip diameter for V-Shape Tool"))
        self.tipdia_entry = FCDoubleSpinner(callback=self.confirmation_message)
        self.tipdia_entry.set_precision(self.decimals)
        self.tipdia_entry.set_range(0.0000, 9999.9999)
        self.tipdia_entry.setSingleStep(0.1)
        self.tipdia_entry.setObjectName("i_vtipdia")

        self.grid3.addWidget(self.tipdialabel, 3, 0)
        self.grid3.addWidget(self.tipdia_entry, 3, 1)

        # Tip Angle
        self.tipanglelabel = QtWidgets.QLabel('%s:' % _('V-Tip Angle'))
        self.tipanglelabel.setToolTip(
            _("The tip angle for V-Shape Tool.\n"
              "In degree."))
        self.tipangle_entry = FCDoubleSpinner(callback=self.confirmation_message)
        self.tipangle_entry.set_precision(self.decimals)
        self.tipangle_entry.set_range(0.0000, 180.0000)
        self.tipangle_entry.setSingleStep(5)
        self.tipangle_entry.setObjectName("i_vtipangle")

        self.grid3.addWidget(self.tipanglelabel, 4, 0)
        self.grid3.addWidget(self.tipangle_entry, 4, 1)

        # Cut Z entry
        cutzlabel = QtWidgets.QLabel('%s:' % _('Cut Z'))
        cutzlabel.setToolTip(
            _("Depth of cut into material. Negative value.\n"
              "In FlatCAM units.")
        )
        self.cutz_entry = FCDoubleSpinner(callback=self.confirmation_message)
        self.cutz_entry.set_precision(self.decimals)
        self.cutz_entry.set_range(-99999.9999, 0.0000)
        self.cutz_entry.setObjectName("i_vcutz")

        self.grid3.addWidget(cutzlabel, 5, 0)
        self.grid3.addWidget(self.cutz_entry, 5, 1)

        # ### Tool Diameter ####
        self.addtool_entry_lbl = QtWidgets.QLabel('%s:' % _('Tool Dia'))
        self.addtool_entry_lbl.setToolTip(
            _("Diameter for the new tool to add in the Tool Table.\n"
              "If the tool is V-shape type then this value is automatically\n"
              "calculated from the other parameters.")
        )
        self.addtool_entry = FCDoubleSpinner(callback=self.confirmation_message)
        self.addtool_entry.set_precision(self.decimals)
        self.addtool_entry.set_range(0.000, 9999.9999)
        self.addtool_entry.setObjectName("i_new_tooldia")

        self.grid3.addWidget(self.addtool_entry_lbl, 6, 0)
        self.grid3.addWidget(self.addtool_entry, 6, 1)

        hlay = QtWidgets.QHBoxLayout()

        self.addtool_btn = QtWidgets.QPushButton(_('Add'))
        self.addtool_btn.setToolTip(
            _("Add a new tool to the Tool Table\n"
              "with the diameter specified above.")
        )

        self.addtool_from_db_btn = QtWidgets.QPushButton(_('Add from DB'))
        self.addtool_from_db_btn.setToolTip(
            _("Add a new tool to the Tool Table\n"
              "from the Tool DataBase.")
        )

        hlay.addWidget(self.addtool_btn)
        hlay.addWidget(self.addtool_from_db_btn)

        self.grid3.addLayout(hlay, 7, 0, 1, 2)

        separator_line = QtWidgets.QFrame()
        separator_line.setFrameShape(QtWidgets.QFrame.HLine)
        separator_line.setFrameShadow(QtWidgets.QFrame.Sunken)
        self.grid3.addWidget(separator_line, 8, 0, 1, 2)

        self.deltool_btn = QtWidgets.QPushButton(_('Delete'))
        self.deltool_btn.setToolTip(
            _("Delete a selection of tools in the Tool Table\n"
              "by first selecting a row(s) in the Tool Table.")
        )
        self.grid3.addWidget(self.deltool_btn, 9, 0, 1, 2)

        # self.grid3.addWidget(QtWidgets.QLabel(''), 10, 0, 1, 2)

        separator_line = QtWidgets.QFrame()
        separator_line.setFrameShape(QtWidgets.QFrame.HLine)
        separator_line.setFrameShadow(QtWidgets.QFrame.Sunken)
        self.grid3.addWidget(separator_line, 11, 0, 1, 2)

        self.tool_data_label = QtWidgets.QLabel(
            "<b>%s: <font color='#0000FF'>%s %d</font></b>" % (_('Parameters for'), _("Tool"), int(1)))
        self.tool_data_label.setToolTip(
            _(
                "The data used for creating GCode.\n"
                "Each tool store it's own set of such data."
            )
        )
        self.grid3.addWidget(self.tool_data_label, 12, 0, 1, 2)

        # Passes
        passlabel = QtWidgets.QLabel('%s:' % _('Passes'))
        passlabel.setToolTip(
            _("Width of the isolation gap in\n"
              "number (integer) of tool widths.")
        )
        self.passes_entry = FCSpinner(callback=self.confirmation_message_int)
        self.passes_entry.set_range(1, 999)
        self.passes_entry.setObjectName("i_passes")

        self.grid3.addWidget(passlabel, 13, 0)
        self.grid3.addWidget(self.passes_entry, 13, 1)

        # Overlap Entry
        overlabel = QtWidgets.QLabel('%s:' % _('Overlap'))
        overlabel.setToolTip(
            _("How much (percentage) of the tool width to overlap each tool pass.")
        )
        self.iso_overlap_entry = FCDoubleSpinner(suffix='%', callback=self.confirmation_message)
        self.iso_overlap_entry.set_precision(self.decimals)
        self.iso_overlap_entry.setWrapping(True)
        self.iso_overlap_entry.set_range(0.0000, 99.9999)
        self.iso_overlap_entry.setSingleStep(0.1)
        self.iso_overlap_entry.setObjectName("i_overlap")

        self.grid3.addWidget(overlabel, 14, 0)
        self.grid3.addWidget(self.iso_overlap_entry, 14, 1)

        # Milling Type Radio Button
        self.milling_type_label = QtWidgets.QLabel('%s:' % _('Milling Type'))
        self.milling_type_label.setToolTip(
            _("Milling type when the selected tool is of type: 'iso_op':\n"
              "- climb / best for precision milling and to reduce tool usage\n"
              "- conventional / useful when there is no backlash compensation")
        )

        self.milling_type_radio = RadioSet([{'label': _('Climb'), 'value': 'cl'},
                                            {'label': _('Conventional'), 'value': 'cv'}])
        self.milling_type_radio.setToolTip(
            _("Milling type when the selected tool is of type: 'iso_op':\n"
              "- climb / best for precision milling and to reduce tool usage\n"
              "- conventional / useful when there is no backlash compensation")
        )
        self.milling_type_radio.setObjectName("i_milling_type")

        self.grid3.addWidget(self.milling_type_label, 15, 0)
        self.grid3.addWidget(self.milling_type_radio, 15, 1)

        # Follow
        self.follow_label = QtWidgets.QLabel('%s:' % _('Follow'))
        self.follow_label.setToolTip(
            _("Generate a 'Follow' geometry.\n"
              "This means that it will cut through\n"
              "the middle of the trace.")
        )

        self.follow_cb = FCCheckBox()
        self.follow_cb.setToolTip(_("Generate a 'Follow' geometry.\n"
                                    "This means that it will cut through\n"
                                    "the middle of the trace."))
        self.follow_cb.setObjectName("i_follow")

        self.grid3.addWidget(self.follow_label, 16, 0)
        self.grid3.addWidget(self.follow_cb, 16, 1)

        # Isolation Type
        self.iso_type_label = QtWidgets.QLabel('%s:' % _('Isolation Type'))
        self.iso_type_label.setToolTip(
            _("Choose how the isolation will be executed:\n"
              "- 'Full' -> complete isolation of polygons\n"
              "- 'Ext' -> will isolate only on the outside\n"
              "- 'Int' -> will isolate only on the inside\n"
              "'Exterior' isolation is almost always possible\n"
              "(with the right tool) but 'Interior'\n"
              "isolation can be done only when there is an opening\n"
              "inside of the polygon (e.g polygon is a 'doughnut' shape).")
        )
        self.iso_type_radio = RadioSet([{'label': _('Full'), 'value': 'full'},
                                        {'label': _('Ext'), 'value': 'ext'},
                                        {'label': _('Int'), 'value': 'int'}])
        self.iso_type_radio.setObjectName("i_iso_type")

        self.grid3.addWidget(self.iso_type_label, 17, 0)
        self.grid3.addWidget(self.iso_type_radio, 17, 1)

        separator_line = QtWidgets.QFrame()
        separator_line.setFrameShape(QtWidgets.QFrame.HLine)
        separator_line.setFrameShadow(QtWidgets.QFrame.Sunken)
        self.grid3.addWidget(separator_line, 18, 0, 1, 2)

        self.apply_param_to_all = FCButton(_("Apply parameters to all tools"))
        self.apply_param_to_all.setToolTip(
            _("The parameters in the current form will be applied\n"
              "on all the tools from the Tool Table.")
        )
        self.grid3.addWidget(self.apply_param_to_all, 22, 0, 1, 2)

        separator_line = QtWidgets.QFrame()
        separator_line.setFrameShape(QtWidgets.QFrame.HLine)
        separator_line.setFrameShadow(QtWidgets.QFrame.Sunken)
        self.grid3.addWidget(separator_line, 23, 0, 1, 2)

        # General Parameters
        self.gen_param_label = QtWidgets.QLabel('<b>%s</b>' % _("Common Parameters"))
        self.gen_param_label.setToolTip(
            _("Parameters that are common for all tools.")
        )
        self.grid3.addWidget(self.gen_param_label, 24, 0, 1, 2)

        # Rest Machining
        self.rest_cb = FCCheckBox('%s' % _("Rest"))
        self.rest_cb.setObjectName("i_rest")
        self.rest_cb.setToolTip(
            _("If checked, use 'rest machining'.\n"
              "Basically it will isolate outside PCB features,\n"
              "using the biggest tool and continue with the next tools,\n"
              "from bigger to smaller, to isolate the copper features that\n"
              "could not be cleared by previous tool, until there is\n"
              "no more copper features to isolate or there are no more tools.\n"
              "If not checked, use the standard algorithm.")
        )

        self.grid3.addWidget(self.rest_cb, 25, 0)

        # Combine All Passes
        self.combine_passes_cb = FCCheckBox(label=_('Combine'))
        self.combine_passes_cb.setToolTip(
            _("Combine all passes into one object")
        )
        self.combine_passes_cb.setObjectName("i_combine")

        self.grid3.addWidget(self.combine_passes_cb, 25, 1)

        # Exception Areas
        self.except_cb = FCCheckBox(label=_('Except'))
        self.except_cb.setToolTip(_("When the isolation geometry is generated,\n"
                                    "by checking this, the area of the object below\n"
                                    "will be subtracted from the isolation geometry."))
        self.except_cb.setObjectName("i_except")
        self.grid3.addWidget(self.except_cb, 27, 0)

        # Type of object to be excepted
        self.type_excobj_radio = RadioSet([{'label': _("Geometry"), 'value': 'geometry'},
                                           {'label': _("Gerber"), 'value': 'gerber'}])
        self.type_excobj_radio.setToolTip(
            _("Specify the type of object to be excepted from isolation.\n"
              "It can be of type: Gerber or Geometry.\n"
              "What is selected here will dictate the kind\n"
              "of objects that will populate the 'Object' combobox.")
        )

        self.grid3.addWidget(self.type_excobj_radio, 27, 1)

        # The object to be excepted
        self.exc_obj_combo = FCComboBox()
        self.exc_obj_combo.setToolTip(_("Object whose area will be removed from isolation geometry."))

        # set the model for the Area Exception comboboxes
        self.exc_obj_combo.setModel(self.app.collection)
        self.exc_obj_combo.setRootModelIndex(self.app.collection.index(0, 0, QtCore.QModelIndex()))
        self.exc_obj_combo.is_last = True
        self.exc_obj_combo.obj_type = self.type_excobj_radio.get_value()

        self.grid3.addWidget(self.exc_obj_combo, 29, 0, 1, 2)

        self.e_ois = OptionalHideInputSection(self.except_cb,
                                              [
                                                  self.type_excobj_radio,
                                                  self.exc_obj_combo
                                              ])

        # Isolation Scope
        self.select_label = QtWidgets.QLabel('%s:' % _("Selection"))
        self.select_label.setToolTip(
            _("Isolation scope. Choose what to isolate:\n"
              "- 'All' -> Isolate all the polygons in the object\n"
              "- 'Selection' -> Isolate a selection of polygons.\n"
              "- 'Reference Object' - will process the area specified by another object.")
        )
        self.select_combo = FCComboBox()
        self.select_combo.addItems(
            [_("All"), _("Area Selection"), _("Polygon Selection"), _("Reference Object")]
        )
        self.select_combo.setObjectName("i_selection")

        self.grid3.addWidget(self.select_label, 30, 0)
        self.grid3.addWidget(self.select_combo, 30, 1)

        self.reference_combo_type_label = QtWidgets.QLabel('%s:' % _("Ref. Type"))
        self.reference_combo_type_label.setToolTip(
            _("The type of FlatCAM object to be used as non copper clearing reference.\n"
              "It can be Gerber, Excellon or Geometry.")
        )
        self.reference_combo_type = FCComboBox()
        self.reference_combo_type.addItems([_("Gerber"), _("Excellon"), _("Geometry")])

        self.grid3.addWidget(self.reference_combo_type_label, 31, 0)
        self.grid3.addWidget(self.reference_combo_type, 31, 1)

        self.reference_combo_label = QtWidgets.QLabel('%s:' % _("Ref. Object"))
        self.reference_combo_label.setToolTip(
            _("The FlatCAM object to be used as non copper clearing reference.")
        )
        self.reference_combo = FCComboBox()
        self.reference_combo.setModel(self.app.collection)
        self.reference_combo.setRootModelIndex(self.app.collection.index(0, 0, QtCore.QModelIndex()))
        self.reference_combo.is_last = True

        self.grid3.addWidget(self.reference_combo_label, 32, 0)
        self.grid3.addWidget(self.reference_combo, 32, 1)

        self.reference_combo.hide()
        self.reference_combo_label.hide()
        self.reference_combo_type.hide()
        self.reference_combo_type_label.hide()

        # Area Selection shape
        self.area_shape_label = QtWidgets.QLabel('%s:' % _("Shape"))
        self.area_shape_label.setToolTip(
            _("The kind of selection shape used for area selection.")
        )

        self.area_shape_radio = RadioSet([{'label': _("Square"), 'value': 'square'},
                                          {'label': _("Polygon"), 'value': 'polygon'}])

        self.grid3.addWidget(self.area_shape_label, 33, 0)
        self.grid3.addWidget(self.area_shape_radio, 33, 1)

        self.area_shape_label.hide()
        self.area_shape_radio.hide()

        separator_line = QtWidgets.QFrame()
        separator_line.setFrameShape(QtWidgets.QFrame.HLine)
        separator_line.setFrameShadow(QtWidgets.QFrame.Sunken)
        self.grid3.addWidget(separator_line, 34, 0, 1, 2)

        self.generate_iso_button = QtWidgets.QPushButton("%s" % _("Generate Isolation Geometry"))
        self.generate_iso_button.setStyleSheet("""
                        QPushButton
                        {
                            font-weight: bold;
                        }
                        """)
        self.generate_iso_button.setToolTip(
            _("Create a Geometry object with toolpaths to cut \n"
              "isolation outside, inside or on both sides of the\n"
              "object. For a Gerber object outside means outside\n"
              "of the Gerber feature and inside means inside of\n"
              "the Gerber feature, if possible at all. This means\n"
              "that only if the Gerber feature has openings inside, they\n"
              "will be isolated. If what is wanted is to cut isolation\n"
              "inside the actual Gerber feature, use a negative tool\n"
              "diameter above.")
        )
        self.tools_box.addWidget(self.generate_iso_button)

        self.create_buffer_button = QtWidgets.QPushButton(_('Buffer Solid Geometry'))
        self.create_buffer_button.setToolTip(
            _("This button is shown only when the Gerber file\n"
              "is loaded without buffering.\n"
              "Clicking this will create the buffered geometry\n"
              "required for isolation.")
        )
        self.tools_box.addWidget(self.create_buffer_button)

        self.tools_box.addStretch()

        # ## Reset Tool
        self.reset_button = QtWidgets.QPushButton(_("Reset Tool"))
        self.reset_button.setToolTip(
            _("Will reset the tool parameters.")
        )
        self.reset_button.setStyleSheet("""
                        QPushButton
                        {
                            font-weight: bold;
                        }
                        """)
        self.tools_box.addWidget(self.reset_button)
        # ############################ FINSIHED GUI ###################################
        # #############################################################################

        # #############################################################################
        # ###################### Setup CONTEXT MENU ###################################
        # #############################################################################
        self.tools_table.setupContextMenu()
        self.tools_table.addContextMenu(
            _("Add"), self.on_add_tool_by_key, icon=QtGui.QIcon(self.app.resource_location + "/plus16.png")
        )
        self.tools_table.addContextMenu(
            _("Add from DB"), self.on_add_tool_by_key, icon=QtGui.QIcon(self.app.resource_location + "/plus16.png")
        )
        self.tools_table.addContextMenu(
            _("Delete"), lambda:
            self.on_tool_delete(rows_to_delete=None, all_tools=None),
            icon=QtGui.QIcon(self.app.resource_location + "/delete32.png")
        )

        # #############################################################################
        # ########################## VARIABLES ########################################
        # #############################################################################
        self.units = ''
        self.iso_tools = {}
        self.tooluid = 0

        # store here the default data for Geometry Data
        self.default_data = {}

        self.obj_name = ""
        self.grb_obj = None

        self.sel_rect = []

        self.first_click = False
        self.cursor_pos = None
        self.mouse_is_dragging = False

        # store here the points for the "Polygon" area selection shape
        self.points = []

        # set this as True when in middle of drawing a "Polygon" area selection shape
        # it is made False by first click to signify that the shape is complete
        self.poly_drawn = False

        self.mm = None
        self.mr = None
        self.kp = None

        # store geometry from Polygon selection
        self.poly_dict = {}

        self.grid_status_memory = self.app.ui.grid_snap_btn.isChecked()

        # store here the state of the combine_cb GUI element
        # used when the rest machining is toggled
        self.old_combine_state = None

        # store here solid_geometry when there are tool with isolation job
        self.solid_geometry = []

        self.tool_type_item_options = []

        self.grb_circle_steps = int(self.app.defaults["gerber_circle_steps"])

        self.tooldia = None

        # multiprocessing
        self.pool = self.app.pool
        self.results = []

        self.form_fields = {
            "tools_iso_passes":         self.passes_entry,
            "tools_iso_overlap":        self.iso_overlap_entry,
            "tools_iso_milling_type":   self.milling_type_radio,
            "tools_iso_combine":        self.combine_passes_cb,
            "tools_iso_follow":         self.follow_cb,
            "tools_iso_isotype":        self.iso_type_radio
        }

        self.name2option = {
            "i_passes":         "tools_iso_passes",
            "i_overlap":        "tools_iso_overlap",
            "i_milling_type":   "tools_iso_milling_type",
            "i_combine":        "tools_iso_combine",
            "i_follow":         "tools_iso_follow",
            "i_iso_type":       "tools_iso_isotype"
        }

        self.old_tool_dia = None

        # #############################################################################
        # ############################ SIGNALS ########################################
        # #############################################################################
        self.addtool_btn.clicked.connect(self.on_tool_add)
        self.addtool_entry.returnPressed.connect(self.on_tooldia_updated)
        self.deltool_btn.clicked.connect(self.on_tool_delete)

        self.tipdia_entry.returnPressed.connect(self.on_calculate_tooldia)
        self.tipangle_entry.returnPressed.connect(self.on_calculate_tooldia)
        self.cutz_entry.returnPressed.connect(self.on_calculate_tooldia)

        self.reference_combo_type.currentIndexChanged.connect(self.on_reference_combo_changed)
        self.select_combo.currentIndexChanged.connect(self.on_toggle_reference)

        self.rest_cb.stateChanged.connect(self.on_rest_machining_check)
        self.order_radio.activated_custom[str].connect(self.on_order_changed)

        self.type_excobj_radio.activated_custom.connect(self.on_type_excobj_index_changed)
        self.apply_param_to_all.clicked.connect(self.on_apply_param_to_all_clicked)
        self.addtool_from_db_btn.clicked.connect(self.on_tool_add_from_db_clicked)

        self.generate_iso_button.clicked.connect(self.on_iso_button_click)
        self.reset_button.clicked.connect(self.set_tool_ui)

        # Cleanup on Graceful exit (CTRL+ALT+X combo key)
        self.app.cleanup.connect(self.reset_usage)

    def on_type_excobj_index_changed(self, val):
        obj_type = 0 if val == 'gerber' else 2
        self.exc_obj_combo.setRootModelIndex(self.app.collection.index(obj_type, 0, QtCore.QModelIndex()))
        self.exc_obj_combo.setCurrentIndex(0)
        self.exc_obj_combo.obj_type = {
            "gerber": "Gerber", "geometry": "Geometry"
        }[self.type_excobj_radio.get_value()]

    def on_row_selection_change(self):
        self.blockSignals(True)

        sel_rows = [it.row() for it in self.tools_table.selectedItems()]
        # sel_rows = sorted(set(index.row() for index in self.tools_table.selectedIndexes()))

        if not sel_rows:
            sel_rows = [0]

        for current_row in sel_rows:
            # populate the form with the data from the tool associated with the row parameter
            try:
                item = self.tools_table.item(current_row, 3)
                if item is not None:
                    tooluid = int(item.text())
                else:
                    return
            except Exception as e:
                log.debug("Tool missing. Add a tool in the Tool Table. %s" % str(e))
                return

            # update the QLabel that shows for which Tool we have the parameters in the UI form
            if len(sel_rows) == 1:
                cr = current_row + 1
                self.tool_data_label.setText(
                    "<b>%s: <font color='#0000FF'>%s %d</font></b>" % (_('Parameters for'), _("Tool"), cr)
                )
                try:
                    # set the form with data from the newly selected tool
                    for tooluid_key, tooluid_value in list(self.iso_tools.items()):
                        if int(tooluid_key) == tooluid:
                            for key, value in tooluid_value.items():
                                if key == 'data':
                                    form_value_storage = tooluid_value[key]
                                    self.storage_to_form(form_value_storage)
                except Exception as e:
                    log.debug("ToolIsolation ---> update_ui() " + str(e))
            else:
                self.tool_data_label.setText(
                    "<b>%s: <font color='#0000FF'>%s</font></b>" % (_('Parameters for'), _("Multiple Tools"))
                )

        self.blockSignals(False)

    def storage_to_form(self, dict_storage):
        for form_key in self.form_fields:
            for storage_key in dict_storage:
                if form_key == storage_key:
                    try:
                        self.form_fields[form_key].set_value(dict_storage[form_key])
                    except Exception as e:
                        log.debug("ToolIsolation.storage_to_form() --> %s" % str(e))
                        pass

    def form_to_storage(self):
        if self.tools_table.rowCount() == 0:
            # there is no tool in tool table so we can't save the GUI elements values to storage
            return

        self.blockSignals(True)

        widget_changed = self.sender()
        wdg_objname = widget_changed.objectName()
        option_changed = self.name2option[wdg_objname]

        # row = self.tools_table.currentRow()
        rows = sorted(set(index.row() for index in self.tools_table.selectedIndexes()))
        for row in rows:
            if row < 0:
                row = 0
            tooluid_item = int(self.tools_table.item(row, 3).text())

            for tooluid_key, tooluid_val in self.iso_tools.items():
                if int(tooluid_key) == tooluid_item:
                    new_option_value = self.form_fields[option_changed].get_value()
                    if option_changed in tooluid_val:
                        tooluid_val[option_changed] = new_option_value
                    if option_changed in tooluid_val['data']:
                        tooluid_val['data'][option_changed] = new_option_value

        self.blockSignals(False)

    def on_apply_param_to_all_clicked(self):
        if self.tools_table.rowCount() == 0:
            # there is no tool in tool table so we can't save the GUI elements values to storage
            log.debug("ToolIsolation.on_apply_param_to_all_clicked() --> no tool in Tools Table, aborting.")
            return

        self.blockSignals(True)

        row = self.tools_table.currentRow()
        if row < 0:
            row = 0

        tooluid_item = int(self.tools_table.item(row, 3).text())
        temp_tool_data = {}

        for tooluid_key, tooluid_val in self.iso_tools.items():
            if int(tooluid_key) == tooluid_item:
                # this will hold the 'data' key of the self.tools[tool] dictionary that corresponds to
                # the current row in the tool table
                temp_tool_data = tooluid_val['data']
                break

        for tooluid_key, tooluid_val in self.iso_tools.items():
            tooluid_val['data'] = deepcopy(temp_tool_data)

        self.app.inform.emit('[success] %s' % _("Current Tool parameters were applied to all tools."))
        self.blockSignals(False)

    def on_add_tool_by_key(self):
        tool_add_popup = FCInputDialog(title='%s...' % _("New Tool"),
                                       text='%s:' % _('Enter a Tool Diameter'),
                                       min=0.0001, max=9999.9999, decimals=self.decimals)
        tool_add_popup.setWindowIcon(QtGui.QIcon(self.app.resource_location + '/letter_t_32.png'))

        val, ok = tool_add_popup.get_value()
        if ok:
            if float(val) == 0:
                self.app.inform.emit('[WARNING_NOTCL] %s' %
                                     _("Please enter a tool diameter with non-zero value, in Float format."))
                return
            self.on_tool_add(dia=float(val))
        else:
            self.app.inform.emit('[WARNING_NOTCL] %s...' % _("Adding Tool cancelled"))

    def install(self, icon=None, separator=None, **kwargs):
        AppTool.install(self, icon, separator, shortcut='Alt+I', **kwargs)

    def run(self, toggle=True):
        self.app.defaults.report_usage("ToolIsolation()")
        log.debug("ToolIsolation().run() was launched ...")

        if toggle:
            # if the splitter is hidden, display it, else hide it but only if the current widget is the same
            if self.app.ui.splitter.sizes()[0] == 0:
                self.app.ui.splitter.setSizes([1, 1])
            else:
                try:
                    if self.app.ui.tool_scroll_area.widget().objectName() == self.toolName:
                        # if tab is populated with the tool but it does not have the focus, focus on it
                        if not self.app.ui.notebook.currentWidget() is self.app.ui.tool_tab:
                            # focus on Tool Tab
                            self.app.ui.notebook.setCurrentWidget(self.app.ui.tool_tab)
                        else:
                            self.app.ui.splitter.setSizes([0, 1])
                except AttributeError:
                    pass
        else:
            if self.app.ui.splitter.sizes()[0] == 0:
                self.app.ui.splitter.setSizes([1, 1])

        AppTool.run(self)
        self.set_tool_ui()

        # reset those objects on a new run
        self.grb_obj = None
        self.obj_name = ''

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

    def set_tool_ui(self):
        self.units = self.app.defaults['units'].upper()
        self.old_tool_dia = self.app.defaults["tools_iso_newdia"]

        # try to select in the Gerber combobox the active object
        try:
            current_name = self.app.collection.get_active().options['name']
            self.object_combo.set_value(current_name)
        except Exception:
            pass

        app_mode = self.app.defaults["global_app_level"]

        # Show/Hide Advanced Options
        if app_mode == 'b':
            self.level.setText('<span style="color:green;"><b>%s</b></span>' % _('Basic'))

            # override the Preferences Value; in Basic mode the Tool Type is always Circular ('C1')
            self.tool_type_radio.set_value('C1')
            self.tool_type_label.hide()
            self.tool_type_radio.hide()

            self.milling_type_label.hide()
            self.milling_type_radio.hide()

            self.iso_type_label.hide()
            self.iso_type_radio.set_value('full')
            self.iso_type_radio.hide()

            self.follow_cb.set_value(False)
            self.follow_cb.hide()
            self.follow_label.hide()

            self.rest_cb.set_value(False)
            self.rest_cb.hide()

            self.except_cb.set_value(False)
            self.except_cb.hide()

            self.select_combo.setCurrentIndex(0)
            self.select_combo.hide()
            self.select_label.hide()
        else:
            self.level.setText('<span style="color:red;"><b>%s</b></span>' % _('Advanced'))

            self.tool_type_radio.set_value(self.app.defaults["tools_iso_tool_type"])
            self.tool_type_label.show()
            self.tool_type_radio.show()

            self.milling_type_label.show()
            self.milling_type_radio.show()

            self.iso_type_label.show()
            self.iso_type_radio.set_value(self.app.defaults["tools_iso_isotype"])
            self.iso_type_radio.show()

            self.follow_cb.set_value(self.app.defaults["tools_iso_follow"])
            self.follow_cb.show()
            self.follow_label.show()

            self.rest_cb.set_value(self.app.defaults["tools_iso_rest"])
            self.rest_cb.show()

            self.except_cb.set_value(self.app.defaults["tools_iso_isoexcept"])
            self.except_cb.show()

            self.select_combo.set_value(self.app.defaults["tools_iso_selection"])
            self.select_combo.show()
            self.select_label.show()

        if self.app.defaults["gerber_buffering"] == 'no':
            self.create_buffer_button.show()
            try:
                self.create_buffer_button.clicked.disconnect(self.on_generate_buffer)
            except TypeError:
                pass
            self.create_buffer_button.clicked.connect(self.on_generate_buffer)
        else:
            self.create_buffer_button.hide()

        self.tools_frame.show()

        self.type_excobj_radio.set_value('gerber')

        # run those once so the obj_type attribute is updated for the FCComboboxes
        # so the last loaded object is displayed
        self.on_type_excobj_index_changed(val="gerber")
        self.on_reference_combo_changed()

        self.order_radio.set_value(self.app.defaults["tools_iso_order"])
        self.passes_entry.set_value(self.app.defaults["tools_iso_passes"])
        self.iso_overlap_entry.set_value(self.app.defaults["tools_iso_overlap"])
        self.milling_type_radio.set_value(self.app.defaults["tools_iso_milling_type"])
        self.combine_passes_cb.set_value(self.app.defaults["tools_iso_combine_passes"])
        self.area_shape_radio.set_value(self.app.defaults["tools_iso_area_shape"])

        self.cutz_entry.set_value(self.app.defaults["tools_iso_tool_cutz"])
        self.tool_type_radio.set_value(self.app.defaults["tools_iso_tool_type"])
        self.tipdia_entry.set_value(self.app.defaults["tools_iso_tool_vtipdia"])
        self.tipangle_entry.set_value(self.app.defaults["tools_iso_tool_vtipangle"])
        self.addtool_entry.set_value(self.app.defaults["tools_iso_newdia"])

        self.on_tool_type(val=self.tool_type_radio.get_value())

        loaded_obj = self.app.collection.get_by_name(self.object_combo.get_value())
        if loaded_obj:
            outname = loaded_obj.options['name']
        else:
            outname = ''

        # init the working variables
        self.default_data.clear()
        self.default_data = {
            "name": outname + '_iso',
            "plot": self.app.defaults["geometry_plot"],
            "cutz": float(self.cutz_entry.get_value()),
            "vtipdia": float(self.tipdia_entry.get_value()),
            "vtipangle": float(self.tipangle_entry.get_value()),
            "travelz": self.app.defaults["geometry_travelz"],
            "feedrate": self.app.defaults["geometry_feedrate"],
            "feedrate_z": self.app.defaults["geometry_feedrate_z"],
            "feedrate_rapid": self.app.defaults["geometry_feedrate_rapid"],
            "dwell": self.app.defaults["geometry_dwell"],
            "dwelltime": self.app.defaults["geometry_dwelltime"],
            "multidepth": self.app.defaults["geometry_multidepth"],
            "ppname_g": self.app.defaults["geometry_ppname_g"],
            "depthperpass": self.app.defaults["geometry_depthperpass"],
            "extracut": self.app.defaults["geometry_extracut"],
            "extracut_length": self.app.defaults["geometry_extracut_length"],
            "toolchange": self.app.defaults["geometry_toolchange"],
            "toolchangez": self.app.defaults["geometry_toolchangez"],
            "endz": self.app.defaults["geometry_endz"],
            "endxy": self.app.defaults["geometry_endxy"],

            "spindlespeed": self.app.defaults["geometry_spindlespeed"],
            "toolchangexy": self.app.defaults["geometry_toolchangexy"],
            "startz": self.app.defaults["geometry_startz"],

            "area_exclusion": self.app.defaults["geometry_area_exclusion"],
            "area_shape": self.app.defaults["geometry_area_shape"],
            "area_strategy": self.app.defaults["geometry_area_strategy"],
            "area_overz": float(self.app.defaults["geometry_area_overz"]),

            "tools_iso_passes": self.app.defaults["tools_iso_passes"],
            "tools_iso_overlap": self.app.defaults["tools_iso_overlap"],
            "tools_iso_milling_type": self.app.defaults["tools_iso_milling_type"],
            "tools_iso_follow": self.app.defaults["tools_iso_follow"],
            "tools_iso_isotype": self.app.defaults["tools_iso_isotype"],

            "tools_iso_rest": self.app.defaults["tools_iso_rest"],
            "tools_iso_combine_passes": self.app.defaults["tools_iso_combine_passes"],
            "tools_iso_isoexcept": self.app.defaults["tools_iso_isoexcept"],
            "tools_iso_selection": self.app.defaults["tools_iso_selection"],
            "tools_iso_area_shape": self.app.defaults["tools_iso_area_shape"]
        }

        try:
            dias = [float(self.app.defaults["tools_iso_tooldia"])]
        except (ValueError, TypeError):
            dias = [float(eval(dia)) for dia in self.app.defaults["tools_iso_tooldia"].split(",") if dia != '']

        if not dias:
            log.error("At least one tool diameter needed. Verify in Edit -> Preferences -> TOOLS -> Isolation Tools.")
            return

        self.tooluid = 0

        self.iso_tools.clear()
        for tool_dia in dias:
            self.tooluid += 1
            self.iso_tools.update({
                int(self.tooluid): {
                    'tooldia': float('%.*f' % (self.decimals, tool_dia)),
                    'offset': 'Path',
                    'offset_value': 0.0,
                    'type': 'Iso',
                    'tool_type': self.tool_type_radio.get_value(),
                    'data': deepcopy(self.default_data),
                    'solid_geometry': []
                }
            })

        self.obj_name = ""
        self.grb_obj = None

        self.tool_type_item_options = ["C1", "C2", "C3", "C4", "B", "V"]
        self.units = self.app.defaults['units'].upper()

    def build_ui(self):
        self.ui_disconnect()

        # updated units
        self.units = self.app.defaults['units'].upper()

        sorted_tools = []
        for k, v in self.iso_tools.items():
            if self.units == "IN":
                sorted_tools.append(float('%.*f' % (self.decimals, float(v['tooldia']))))
            else:
                sorted_tools.append(float('%.*f' % (self.decimals, float(v['tooldia']))))

        order = self.order_radio.get_value()
        if order == 'fwd':
            sorted_tools.sort(reverse=False)
        elif order == 'rev':
            sorted_tools.sort(reverse=True)
        else:
            pass

        n = len(sorted_tools)
        self.tools_table.setRowCount(n)
        tool_id = 0

        for tool_sorted in sorted_tools:
            for tooluid_key, tooluid_value in self.iso_tools.items():
                if float('%.*f' % (self.decimals, tooluid_value['tooldia'])) == tool_sorted:
                    tool_id += 1
                    id_ = QtWidgets.QTableWidgetItem('%d' % int(tool_id))
                    id_.setFlags(QtCore.Qt.ItemIsSelectable | QtCore.Qt.ItemIsEnabled)
                    row_no = tool_id - 1
                    self.tools_table.setItem(row_no, 0, id_)  # Tool name/id

                    # Make sure that the drill diameter when in MM is with no more than 2 decimals
                    # There are no drill bits in MM with more than 2 decimals diameter
                    # For INCH the decimals should be no more than 4. There are no drills under 10mils
                    dia = QtWidgets.QTableWidgetItem('%.*f' % (self.decimals, tooluid_value['tooldia']))

                    dia.setFlags(QtCore.Qt.ItemIsEnabled)

                    tool_type_item = FCComboBox()
                    tool_type_item.addItems(self.tool_type_item_options)

                    # tool_type_item.setStyleSheet('background-color: rgb(255,255,255)')
                    idx = tool_type_item.findText(tooluid_value['tool_type'])
                    tool_type_item.setCurrentIndex(idx)

                    tool_uid_item = QtWidgets.QTableWidgetItem(str(int(tooluid_key)))

                    self.tools_table.setItem(row_no, 1, dia)  # Diameter
                    self.tools_table.setCellWidget(row_no, 2, tool_type_item)

                    # ## REMEMBER: THIS COLUMN IS HIDDEN IN OBJECTUI.PY # ##
                    self.tools_table.setItem(row_no, 3, tool_uid_item)  # Tool unique ID

        # make the diameter column editable
        for row in range(tool_id):
            self.tools_table.item(row, 1).setFlags(
                QtCore.Qt.ItemIsEditable | QtCore.Qt.ItemIsSelectable | QtCore.Qt.ItemIsEnabled)

        # all the tools are selected by default
        self.tools_table.selectColumn(0)
        #
        self.tools_table.resizeColumnsToContents()
        self.tools_table.resizeRowsToContents()

        vertical_header = self.tools_table.verticalHeader()
        vertical_header.hide()
        self.tools_table.setVerticalScrollBarPolicy(QtCore.Qt.ScrollBarAlwaysOff)

        horizontal_header = self.tools_table.horizontalHeader()
        horizontal_header.setMinimumSectionSize(10)
        horizontal_header.setSectionResizeMode(0, QtWidgets.QHeaderView.Fixed)
        horizontal_header.resizeSection(0, 20)
        horizontal_header.setSectionResizeMode(1, QtWidgets.QHeaderView.Stretch)

        # self.tools_table.setSortingEnabled(True)
        # sort by tool diameter
        # self.tools_table.sortItems(1)

        self.tools_table.setMinimumHeight(self.tools_table.getHeight())
        self.tools_table.setMaximumHeight(self.tools_table.getHeight())

        self.ui_connect()

        # set the text on tool_data_label after loading the object
        sel_rows = []
        sel_items = self.tools_table.selectedItems()
        for it in sel_items:
            sel_rows.append(it.row())
        if len(sel_rows) > 1:
            self.tool_data_label.setText(
                "<b>%s: <font color='#0000FF'>%s</font></b>" % (_('Parameters for'), _("Multiple Tools"))
            )

    def ui_connect(self):
        self.tools_table.itemChanged.connect(self.on_tool_edit)

        # rows selected
        self.tools_table.clicked.connect(self.on_row_selection_change)
        self.tools_table.horizontalHeader().sectionClicked.connect(self.on_row_selection_change)

        for row in range(self.tools_table.rowCount()):
            try:
                self.tools_table.cellWidget(row, 2).currentIndexChanged.connect(self.on_tooltable_cellwidget_change)
            except AttributeError:
                pass

        self.tool_type_radio.activated_custom.connect(self.on_tool_type)

        for opt in self.form_fields:
            current_widget = self.form_fields[opt]
            if isinstance(current_widget, FCCheckBox):
                current_widget.stateChanged.connect(self.form_to_storage)
            if isinstance(current_widget, RadioSet):
                current_widget.activated_custom.connect(self.form_to_storage)
            elif isinstance(current_widget, FCDoubleSpinner) or isinstance(current_widget, FCSpinner):
                current_widget.returnPressed.connect(self.form_to_storage)
            elif isinstance(current_widget, FCComboBox):
                current_widget.currentIndexChanged.connect(self.form_to_storage)

        self.rest_cb.stateChanged.connect(self.on_rest_machining_check)
        self.order_radio.activated_custom[str].connect(self.on_order_changed)

    def ui_disconnect(self):

        try:
            # if connected, disconnect the signal from the slot on item_changed as it creates issues
            self.tools_table.itemChanged.disconnect()
        except (TypeError, AttributeError):
            pass

        try:
            # if connected, disconnect the signal from the slot on item_changed as it creates issues
            self.tool_type_radio.activated_custom.disconnect()
        except (TypeError, AttributeError):
            pass

        for row in range(self.tools_table.rowCount()):

            try:
                self.tools_table.cellWidget(row, 2).currentIndexChanged.disconnect()
            except (TypeError, AttributeError):
                pass

        for opt in self.form_fields:
            current_widget = self.form_fields[opt]
            if isinstance(current_widget, FCCheckBox):
                try:
                    current_widget.stateChanged.disconnect(self.form_to_storage)
                except (TypeError, ValueError):
                    pass
            if isinstance(current_widget, RadioSet):
                try:
                    current_widget.activated_custom.disconnect(self.form_to_storage)
                except (TypeError, ValueError):
                    pass
            elif isinstance(current_widget, FCDoubleSpinner) or isinstance(current_widget, FCSpinner):
                try:
                    current_widget.returnPressed.disconnect(self.form_to_storage)
                except (TypeError, ValueError):
                    pass
            elif isinstance(current_widget, FCComboBox):
                try:
                    current_widget.currentIndexChanged.disconnect(self.form_to_storage)
                except (TypeError, ValueError):
                    pass

        try:
            self.rest_cb.stateChanged.disconnect()
        except (TypeError, ValueError):
            pass
        try:
            self.order_radio.activated_custom[str].disconnect()
        except (TypeError, ValueError):
            pass

        # rows selected
        try:
            self.tools_table.clicked.disconnect()
        except (TypeError, AttributeError):
            pass
        try:
            self.tools_table.horizontalHeader().sectionClicked.disconnect()
        except (TypeError, AttributeError):
            pass

    def on_tooldia_updated(self):
        if self.tool_type_radio.get_value() == 'C1':
            self.old_tool_dia = self.addtool_entry.get_value()

    def on_reference_combo_changed(self):
        obj_type = self.reference_combo_type.currentIndex()
        self.reference_combo.setRootModelIndex(self.app.collection.index(obj_type, 0, QtCore.QModelIndex()))
        self.reference_combo.setCurrentIndex(0)
        self.reference_combo.obj_type = {
            _("Gerber"): "Gerber", _("Excellon"): "Excellon", _("Geometry"): "Geometry"
        }[self.reference_combo_type.get_value()]

    def on_toggle_reference(self):
        val = self.select_combo.get_value()

        if val == _("All"):
            self.reference_combo.hide()
            self.reference_combo_label.hide()
            self.reference_combo_type.hide()
            self.reference_combo_type_label.hide()
            self.area_shape_label.hide()
            self.area_shape_radio.hide()

            # disable rest-machining for area painting
            self.rest_cb.setDisabled(False)
        elif val == _("Area Selection"):
            self.reference_combo.hide()
            self.reference_combo_label.hide()
            self.reference_combo_type.hide()
            self.reference_combo_type_label.hide()
            self.area_shape_label.show()
            self.area_shape_radio.show()

            # disable rest-machining for area isolation
            self.rest_cb.set_value(False)
            self.rest_cb.setDisabled(True)
        elif val == _("Polygon Selection"):
            self.reference_combo.hide()
            self.reference_combo_label.hide()
            self.reference_combo_type.hide()
            self.reference_combo_type_label.hide()
            self.area_shape_label.hide()
            self.area_shape_radio.hide()
        else:
            self.reference_combo.show()
            self.reference_combo_label.show()
            self.reference_combo_type.show()
            self.reference_combo_type_label.show()
            self.area_shape_label.hide()
            self.area_shape_radio.hide()

            # disable rest-machining for area painting
            self.rest_cb.setDisabled(False)

    def on_order_changed(self, order):
        if order != 'no':
            self.build_ui()

    def on_rest_machining_check(self, state):
        if state:
            self.order_radio.set_value('rev')
            self.ncc_order_label.setDisabled(True)
            self.order_radio.setDisabled(True)

            self.old_combine_state = self.combine_passes_cb.get_value()
            self.combine_passes_cb.set_value(True)
            self.combine_passes_cb.setDisabled(True)
        else:
            self.ncc_order_label.setDisabled(False)
            self.order_radio.setDisabled(False)

            self.combine_passes_cb.set_value(self.old_combine_state)
            self.combine_passes_cb.setDisabled(False)

    def on_tooltable_cellwidget_change(self):
        cw = self.sender()
        assert isinstance(cw, QtWidgets.QComboBox), \
            "Expected a QtWidgets.QComboBox, got %s" % isinstance(cw, QtWidgets.QComboBox)

        cw_index = self.tools_table.indexAt(cw.pos())
        cw_row = cw_index.row()
        cw_col = cw_index.column()

        current_uid = int(self.tools_table.item(cw_row, 3).text())

        # if the sender is in the column with index 2 then we update the tool_type key
        if cw_col == 2:
            tt = cw.currentText()
            typ = 'Iso' if tt == 'V' else "Rough"

            self.iso_tools[current_uid].update({
                'type': typ,
                'tool_type': tt,
            })

    def on_tool_type(self, val):
        if val == 'V':
            self.addtool_entry_lbl.setDisabled(True)
            self.addtool_entry.setDisabled(True)
            self.tipdialabel.show()
            self.tipdia_entry.show()
            self.tipanglelabel.show()
            self.tipangle_entry.show()

            self.on_calculate_tooldia()
        else:
            self.addtool_entry_lbl.setDisabled(False)
            self.addtool_entry.setDisabled(False)
            self.tipdialabel.hide()
            self.tipdia_entry.hide()
            self.tipanglelabel.hide()
            self.tipangle_entry.hide()

            self.addtool_entry.set_value(self.old_tool_dia)

    def on_calculate_tooldia(self):
        if self.tool_type_radio.get_value() == 'V':
            tip_dia = float(self.tipdia_entry.get_value())
            tip_angle = float(self.tipangle_entry.get_value()) / 2.0
            cut_z = float(self.cutz_entry.get_value())
            cut_z = -cut_z if cut_z < 0 else cut_z

            # calculated tool diameter so the cut_z parameter is obeyed
            tool_dia = tip_dia + (2 * cut_z * math.tan(math.radians(tip_angle)))

            # update the default_data so it is used in the iso_tools dict
            self.default_data.update({
                "vtipdia": tip_dia,
                "vtipangle": (tip_angle * 2),
            })

            self.addtool_entry.set_value(tool_dia)

            return tool_dia
        else:
            return float(self.addtool_entry.get_value())

    def on_tool_add(self, dia=None, muted=None):
        self.blockSignals(True)

        self.units = self.app.defaults['units'].upper()

        if dia:
            tool_dia = dia
        else:
            tool_dia = self.on_calculate_tooldia()
            if tool_dia is None:
                self.build_ui()
                self.app.inform.emit('[WARNING_NOTCL] %s' % _("Please enter a tool diameter to add, in Float format."))
                return

        tool_dia = float('%.*f' % (self.decimals, tool_dia))

        if tool_dia == 0:
            self.app.inform.emit('[WARNING_NOTCL] %s' % _("Please enter a tool diameter with non-zero value, "
                                                          "in Float format."))
            return

        # construct a list of all 'tooluid' in the self.tools
        tool_uid_list = []
        for tooluid_key in self.iso_tools:
            tool_uid_item = int(tooluid_key)
            tool_uid_list.append(tool_uid_item)

        # find maximum from the temp_uid, add 1 and this is the new 'tooluid'
        if not tool_uid_list:
            max_uid = 0
        else:
            max_uid = max(tool_uid_list)
        self.tooluid = int(max_uid + 1)

        tool_dias = []
        for k, v in self.iso_tools.items():
            for tool_v in v.keys():
                if tool_v == 'tooldia':
                    tool_dias.append(float('%.*f' % (self.decimals, (v[tool_v]))))

        if float('%.*f' % (self.decimals, tool_dia)) in tool_dias:
            if muted is None:
                self.app.inform.emit('[WARNING_NOTCL] %s' % _("Cancelled. Tool already in Tool Table."))
            # self.tools_table.itemChanged.connect(self.on_tool_edit)
            self.blockSignals(False)

            return
        else:
            if muted is None:
                self.app.inform.emit('[success] %s' % _("New tool added to Tool Table."))
            self.iso_tools.update({
                int(self.tooluid): {
                    'tooldia': float('%.*f' % (self.decimals, tool_dia)),
                    'offset': 'Path',
                    'offset_value': 0.0,
                    'type': 'Iso',
                    'tool_type': self.tool_type_radio.get_value(),
                    'data': deepcopy(self.default_data),
                    'solid_geometry': []
                }
            })

        self.blockSignals(False)
        self.build_ui()

    def on_tool_edit(self):
        self.blockSignals(True)

        old_tool_dia = ''
        tool_dias = []
        for k, v in self.iso_tools.items():
            for tool_v in v.keys():
                if tool_v == 'tooldia':
                    tool_dias.append(float('%.*f' % (self.decimals, v[tool_v])))

        for row in range(self.tools_table.rowCount()):

            try:
                new_tool_dia = float(self.tools_table.item(row, 1).text())
            except ValueError:
                # try to convert comma to decimal point. if it's still not working error message and return
                try:
                    new_tool_dia = float(self.tools_table.item(row, 1).text().replace(',', '.'))
                except ValueError:
                    self.app.inform.emit('[ERROR_NOTCL]  %s' % _("Wrong value format entered, use a number."))
                    self.blockSignals(False)
                    return

            tooluid = int(self.tools_table.item(row, 3).text())

            # identify the tool that was edited and get it's tooluid
            if new_tool_dia not in tool_dias:
                self.iso_tools[tooluid]['tooldia'] = new_tool_dia
                self.app.inform.emit('[success] %s' % _("Tool from Tool Table was edited."))
                self.blockSignals(False)
                self.build_ui()
                return
            else:
                # identify the old tool_dia and restore the text in tool table
                for k, v in self.iso_tools.items():
                    if k == tooluid:
                        old_tool_dia = v['tooldia']
                        break
                restore_dia_item = self.tools_table.item(row, 1)
                restore_dia_item.setText(str(old_tool_dia))
                self.app.inform.emit('[WARNING_NOTCL] %s' % _("Cancelled. "
                                                              "New diameter value is already in the Tool Table."))
        self.blockSignals(False)
        self.build_ui()

    def on_tool_delete(self, rows_to_delete=None, all_tools=None):
        """
        Will delete a tool in the tool table

        :param rows_to_delete: which rows to delete; can be a list
        :param all_tools: delete all tools in the tool table
        :return:
        """
        self.blockSignals(True)

        deleted_tools_list = []

        if all_tools:
            self.iso_tools.clear()
            self.blockSignals(False)
            self.build_ui()
            return

        if rows_to_delete:
            try:
                for row in rows_to_delete:
                    tooluid_del = int(self.tools_table.item(row, 3).text())
                    deleted_tools_list.append(tooluid_del)
            except TypeError:
                tooluid_del = int(self.tools_table.item(rows_to_delete, 3).text())
                deleted_tools_list.append(tooluid_del)

            for t in deleted_tools_list:
                self.iso_tools.pop(t, None)

            self.blockSignals(False)
            self.build_ui()
            return

        try:
            if self.tools_table.selectedItems():
                for row_sel in self.tools_table.selectedItems():
                    row = row_sel.row()
                    if row < 0:
                        continue
                    tooluid_del = int(self.tools_table.item(row, 3).text())
                    deleted_tools_list.append(tooluid_del)

                for t in deleted_tools_list:
                    self.iso_tools.pop(t, None)

        except AttributeError:
            self.app.inform.emit('[WARNING_NOTCL] %s' % _("Delete failed. Select a tool to delete."))
            self.blockSignals(False)
            return
        except Exception as e:
            log.debug(str(e))

        self.app.inform.emit('[success] %s' % _("Tool(s) deleted from Tool Table."))
        self.blockSignals(False)
        self.build_ui()

    def on_generate_buffer(self):
        self.app.inform.emit('[WARNING_NOTCL] %s...' % _("Buffering solid geometry"))

        self.obj_name = self.object_combo.currentText()

        # Get source object.
        try:
            self.grb_obj = self.app.collection.get_by_name(self.obj_name)
        except Exception as e:
            self.app.inform.emit('[ERROR_NOTCL] %s: %s' % (_("Could not retrieve object"), str(self.obj_name)))
            return "Could not retrieve object: %s with error: %s" % (self.obj_name, str(e))

        if self.grb_obj is None:
            self.app.inform.emit('[ERROR_NOTCL] %s: %s' % (_("Object not found"), str(self.obj_name)))
            return

        def buffer_task():
            with self.app.proc_container.new('%s...' % _("Buffering")):
                if isinstance(self.grb_obj.solid_geometry, list):
                    self.grb_obj.solid_geometry = MultiPolygon(self.grb_obj.solid_geometry)

                self.grb_obj.solid_geometry = self.grb_obj.solid_geometry.buffer(0.0000001)
                self.grb_obj.solid_geometry = self.grb_obj.solid_geometry.buffer(-0.0000001)
                self.app.inform.emit('[success] %s.' % _("Done"))
                self.grb_obj.plot_single_object.emit()

        self.app.worker_task.emit({'fcn': buffer_task, 'params': []})

    def on_iso_button_click(self):

        self.obj_name = self.object_combo.currentText()

        # Get source object.
        try:
            self.grb_obj = self.app.collection.get_by_name(self.obj_name)
        except Exception as e:
            self.app.inform.emit('[ERROR_NOTCL] %s: %s' % (_("Could not retrieve object"), str(self.obj_name)))
            return "Could not retrieve object: %s with error: %s" % (self.obj_name, str(e))

        if self.grb_obj is None:
            self.app.inform.emit('[ERROR_NOTCL] %s: %s' % (_("Object not found"), str(self.obj_name)))
            return

        def worker_task(iso_obj, app_obj):
            with self.app.proc_container.new(_("Isolating...")):
                self.isolate_handler(iso_obj)

        self.app.worker_task.emit({'fcn': worker_task, 'params': [self.grb_obj, self.app]})

    def follow_geo(self, followed_obj, outname):
        """
        Creates a geometry object "following" the gerber paths.

        :param followed_obj:    Gerber object for which to generate the follow geometry
        :type followed_obj:     AppObjects.FlatCAMGerber.GerberObject
        :param outname:         Nme of the resulting Geometry object
        :type outname:          str
        :return: None
        """

        def follow_init(follow_obj, app):
            # Propagate options
            follow_obj.options["cnctooldia"] = str(tooldia)
            follow_obj.solid_geometry = self.grb_obj.follow_geometry

        # in the end toggle the visibility of the origin object so we can see the generated Geometry
        followed_obj.ui.plot_cb.set_value(False)
        follow_name = outname

        for tool in self.iso_tools:
            tooldia = self.iso_tools[tool]['tooldia']
            new_name = "%s_%.*f" % (follow_name, self.decimals, tooldia)

            follow_state = self.iso_tools[tool]['data']['tools_iso_follow']
            if follow_state:
                ret = self.app.app_obj.new_object("geometry", new_name, follow_init)
                if ret == 'fail':
                    self.app.inform.emit("[ERROR_NOTCL] %s: %.*f" % (
                        _("Failed to create Follow Geometry with tool diameter"), self.decimals, tooldia))
                else:
                    self.app.inform.emit("[success] %s: %.*f" % (
                        _("Follow Geometry was created with tool diameter"), self.decimals, tooldia))

    def isolate_handler(self, isolated_obj):
        """
        Creates a geometry object with paths around the gerber features.

        :param isolated_obj:    Gerber object for which to generate the isolating routing geometry
        :type isolated_obj:     AppObjects.FlatCAMGerber.GerberObject
        :return: None
        """
        selection = self.select_combo.get_value()

        if selection == _("All"):
            self.isolate(isolated_obj=isolated_obj)
        elif selection == _("Area Selection"):
            self.app.inform.emit('[WARNING_NOTCL] %s' % _("Click the start point of the area."))

            if self.app.is_legacy is False:
                self.app.plotcanvas.graph_event_disconnect('mouse_press', self.app.on_mouse_click_over_plot)
                self.app.plotcanvas.graph_event_disconnect('mouse_move', self.app.on_mouse_move_over_plot)
                self.app.plotcanvas.graph_event_disconnect('mouse_release', self.app.on_mouse_click_release_over_plot)
            else:
                self.app.plotcanvas.graph_event_disconnect(self.app.mp)
                self.app.plotcanvas.graph_event_disconnect(self.app.mm)
                self.app.plotcanvas.graph_event_disconnect(self.app.mr)

            self.mr = self.app.plotcanvas.graph_event_connect('mouse_release', self.on_mouse_release)
            self.mm = self.app.plotcanvas.graph_event_connect('mouse_move', self.on_mouse_move)
            self.kp = self.app.plotcanvas.graph_event_connect('key_press', self.on_key_press)

        elif selection == _("Polygon Selection"):
            # disengage the grid snapping since it may be hard to click on polygons with grid snapping on
            if self.app.ui.grid_snap_btn.isChecked():
                self.grid_status_memory = True
                self.app.ui.grid_snap_btn.trigger()
            else:
                self.grid_status_memory = False

            self.mr = self.app.plotcanvas.graph_event_connect('mouse_release', self.on_poly_mouse_click_release)
            self.kp = self.app.plotcanvas.graph_event_connect('key_press', self.on_key_press)

            if self.app.is_legacy is False:
                self.app.plotcanvas.graph_event_disconnect('mouse_release',
                                                           self.app.on_mouse_click_release_over_plot)
            else:
                self.app.plotcanvas.graph_event_disconnect(self.app.mr)

            self.app.inform.emit('[WARNING_NOTCL] %s' % _("Click on a polygon to isolate it."))
        elif selection == _("Reference Object"):
            ref_obj = self.app.collection.get_by_name(self.reference_combo.get_value())
            ref_geo = cascaded_union(ref_obj.solid_geometry)
            use_geo = cascaded_union(isolated_obj.solid_geometry).difference(ref_geo)
            self.isolate(isolated_obj=isolated_obj, geometry=use_geo)

    def isolate(self, isolated_obj, geometry=None, limited_area=None, plot=True):
        """
        Creates an isolation routing geometry object in the project.

        :param isolated_obj:    Gerber object for which to generate the isolating routing geometry
        :type isolated_obj:     AppObjects.FlatCAMGerber.GerberObject
        :param geometry:        specific geometry to isolate
        :type geometry:         List of Shapely polygon
        :param limited_area:    if not None isolate only this area
        :type limited_area:     Shapely Polygon or a list of them
        :param plot:            if to plot the resulting geometry object
        :type plot:             bool
        :return: None
        """

        combine = self.combine_passes_cb.get_value()
        tools_storage = self.iso_tools

        if combine:
            if self.rest_cb.get_value():
                self.combined_rest(iso_obj=isolated_obj, iso2geo=geometry, tools_storage=tools_storage,
                                   lim_area=limited_area, plot=plot)
            else:
                self.combined_normal(iso_obj=isolated_obj, iso2geo=geometry, tools_storage=tools_storage,
                                     lim_area=limited_area, plot=plot)

        else:
            for tool in tools_storage:
                tool_data = tools_storage[tool]['data']
                to_follow = tool_data['tools_iso_follow']

                work_geo = geometry
                if work_geo is None:
                    work_geo = isolated_obj.follow_geometry if to_follow else isolated_obj.solid_geometry

                iso_t = {
                    'ext': 0,
                    'int': 1,
                    'full': 2
                }[tool_data['tools_iso_isotype']]

                passes = tool_data['tools_iso_passes']
                overlap = tool_data['tools_iso_overlap']
                overlap /= 100.0

                milling_type = tool_data['tools_iso_milling_type']

                iso_except = tool_data['tools_iso_isoexcept']

                for i in range(passes):
                    tool_dia = tools_storage[tool]['tooldia']
                    tool_type = tools_storage[tool]['tool_type']

                    iso_offset = tool_dia * ((2 * i + 1) / 2.0000001) - (i * overlap * tool_dia)
                    outname = "%s_%.*f" % (isolated_obj.options["name"], self.decimals, float(tool_dia))

                    if passes > 1:
                        iso_name = outname + "_iso" + str(i + 1)
                        if iso_t == 0:
                            iso_name = outname + "_ext_iso" + str(i + 1)
                        elif iso_t == 1:
                            iso_name = outname + "_int_iso" + str(i + 1)
                    else:
                        iso_name = outname + "_iso"
                        if iso_t == 0:
                            iso_name = outname + "_ext_iso"
                        elif iso_t == 1:
                            iso_name = outname + "_int_iso"

                    # if milling type is climb then the move is counter-clockwise around features
                    mill_dir = 1 if milling_type == 'cl' else 0

                    iso_geo = self.generate_envelope(iso_offset, mill_dir, geometry=work_geo, env_iso_type=iso_t,
                                                     follow=to_follow, nr_passes=i)
                    if iso_geo == 'fail':
                        self.app.inform.emit(
                            '[ERROR_NOTCL] %s' % _("Isolation geometry could not be generated."))
                        continue

                    # ############################################################
                    # ########## AREA SUBTRACTION ################################
                    # ############################################################
                    if iso_except:
                        self.app.proc_container.update_view_text(' %s' % _("Subtracting Geo"))
                        iso_geo = self.area_subtraction(iso_geo)

                    if limited_area:
                        self.app.proc_container.update_view_text(' %s' % _("Intersecting Geo"))
                        iso_geo = self.area_intersection(iso_geo, intersection_geo=limited_area)

                    # transfer the Cut Z and Vtip and VAngle values in case that we use the V-Shape tool in
                    # Gerber UI
                    if tool_type.lower() == 'v':
                        new_cutz = self.cutz_entry.get_value()
                        new_vtipdia = self.tipdia_entry.get_value()
                        new_vtipangle = self.tipangle_entry.get_value()
                        tool_type = 'V'
                        tool_data.update({
                            "name": iso_name,
                            "cutz": new_cutz,
                            "vtipdia": new_vtipdia,
                            "vtipangle": new_vtipangle,
                        })
                    else:
                        tool_data.update({
                            "name": iso_name,
                        })
                        tool_type = 'C1'

                    def iso_init(geo_obj, fc_obj):
                        # Propagate options
                        geo_obj.options["cnctooldia"] = str(tool_dia)
                        geo_obj.solid_geometry = deepcopy(iso_geo)

                        # ############################################################
                        # ########## AREA SUBTRACTION ################################
                        # ############################################################
                        if self.except_cb.get_value():
                            self.app.proc_container.update_view_text(' %s' % _("Subtracting Geo"))
                            geo_obj.solid_geometry = self.area_subtraction(geo_obj.solid_geometry)

                        geo_obj.tools = {}
                        geo_obj.tools['1'] = {}
                        geo_obj.tools.update({
                            '1': {
                                'tooldia': float(tool_dia),
                                'offset': 'Path',
                                'offset_value': 0.0,
                                'type': _('Rough'),
                                'tool_type': tool_type,
                                'data': tool_data,
                                'solid_geometry': geo_obj.solid_geometry
                            }
                        })

                        # detect if solid_geometry is empty and this require list flattening which is "heavy"
                        # or just looking in the lists (they are one level depth) and if any is not empty
                        # proceed with object creation, if there are empty and the number of them is the length
                        # of the list then we have an empty solid_geometry which should raise a Custom Exception
                        empty_cnt = 0
                        if not isinstance(geo_obj.solid_geometry, list):
                            geo_obj.solid_geometry = [geo_obj.solid_geometry]

                        for g in geo_obj.solid_geometry:
                            if g:
                                break
                            else:
                                empty_cnt += 1

                        if empty_cnt == len(geo_obj.solid_geometry):
                            fc_obj.inform.emit('[ERROR_NOTCL] %s: %s' % (
                                _("Empty Geometry in"), geo_obj.options["name"]))
                            return 'fail'
                        else:
                            fc_obj.inform.emit('[success] %s: %s' %
                                               (_("Isolation geometry created"), geo_obj.options["name"]))
                        geo_obj.multigeo = False

                    self.app.app_obj.new_object("geometry", iso_name, iso_init, plot=plot)

    def combined_rest(self, iso_obj, iso2geo, tools_storage, lim_area, plot=True):
        """

        :param iso_obj:         the isolated Gerber object
        :type iso_obj:          AppObjects.FlatCAMGerber.GerberObject
        :param iso2geo:         specific geometry to isolate
        :type iso2geo:          list of Shapely Polygon
        :param tools_storage:   a dictionary that holds the tools and geometry
        :type tools_storage:    dict
        :param lim_area:        if not None restrict isolation to this area
        :type lim_area:         Shapely Polygon or a list of them
        :param plot:            if to plot the resulting geometry object
        :type plot:             bool
        :return:                Isolated solid geometry
        :rtype:
        """

        log.debug("ToolIsolation.combine_rest()")

        total_solid_geometry = []

        iso_name = iso_obj.options["name"]
        geometry = iso2geo

        for tool in tools_storage:
            tool_dia = tools_storage[tool]['tooldia']
            tool_type = tools_storage[tool]['tool_type']
            tool_data = tools_storage[tool]['data']

            to_follow = tool_data['tools_iso_follow']

            work_geo = geometry
            if work_geo is None:
                work_geo = iso_obj.follow_geometry if to_follow else iso_obj.solid_geometry

            iso_t = {
                'ext': 0,
                'int': 1,
                'full': 2
            }[tool_data['tools_iso_isotype']]

            passes = tool_data['tools_iso_passes']
            overlap = tool_data['tools_iso_overlap']
            overlap /= 100.0

            milling_type = tool_data['tools_iso_milling_type']

            iso_except = tool_data['tools_iso_isoexcept']

            outname = "%s_%.*f" % (iso_obj.options["name"], self.decimals, float(tool_dia))

            iso_name = outname + "_iso"
            if iso_t == 0:
                iso_name = outname + "_ext_iso"
            elif iso_t == 1:
                iso_name = outname + "_int_iso"

            # transfer the Cut Z and Vtip and VAngle values in case that we use the V-Shape tool in Gerber UI
            if tool_type.lower() == 'v':
                new_cutz = self.ui.cutz_spinner.get_value()
                new_vtipdia = self.ui.tipdia_spinner.get_value()
                new_vtipangle = self.ui.tipangle_spinner.get_value()
                tool_type = 'V'
                tool_data.update({
                    "name": iso_name,
                    "cutz": new_cutz,
                    "vtipdia": new_vtipdia,
                    "vtipangle": new_vtipangle,
                })
            else:
                tool_data.update({
                    "name": iso_name,
                })
                tool_type = 'C1'

            solid_geo = []
            for nr_pass in range(passes):
                iso_offset = tool_dia * ((2 * nr_pass + 1) / 2.0000001) - (nr_pass * overlap * tool_dia)

                # if milling type is climb then the move is counter-clockwise around features
                mill_dir = 1 if milling_type == 'cl' else 0

                iso_geo = self.generate_envelope(iso_offset, mill_dir, geometry=work_geo, env_iso_type=iso_t,
                                                 follow=to_follow, nr_passes=nr_pass)
                if iso_geo == 'fail':
                    self.app.inform.emit('[ERROR_NOTCL] %s' % _("Isolation geometry could not be generated."))
                    continue
                try:
                    for geo in iso_geo:
                        solid_geo.append(geo)
                except TypeError:
                    solid_geo.append(iso_geo)

                # ############################################################
                # ########## AREA SUBTRACTION ################################
                # ############################################################
                if iso_except:
                    self.app.proc_container.update_view_text(' %s' % _("Subtracting Geo"))
                    solid_geo = self.area_subtraction(solid_geo)

                if lim_area:
                    self.app.proc_container.update_view_text(' %s' % _("Intersecting Geo"))
                    solid_geo = self.area_intersection(solid_geo, intersection_geo=lim_area)

            tools_storage.update({
                tool: {
                    'tooldia': float(tool_dia),
                    'offset': 'Path',
                    'offset_value': 0.0,
                    'type': _('Rough'),
                    'tool_type': tool_type,
                    'data': tool_data,
                    'solid_geometry': deepcopy(solid_geo)
                }
            })

            total_solid_geometry += solid_geo

        def iso_init(geo_obj, app_obj):
            geo_obj.options["cnctooldia"] = str(tool_dia)

            geo_obj.tools = dict(tools_storage)
            geo_obj.solid_geometry = total_solid_geometry
            # even if combine is checked, one pass is still single-geo

            if len(tools_storage) > 1:
                geo_obj.multigeo = True
            else:
                if to_follow:
                    passes_no = 1
                else:
                    passes_no = float(tools_storage[0]['data']['tools_iso_passes'])
                geo_obj.multigeo = True if passes_no > 1 else False

            # detect if solid_geometry is empty and this require list flattening which is "heavy"
            # or just looking in the lists (they are one level depth) and if any is not empty
            # proceed with object creation, if there are empty and the number of them is the length
            # of the list then we have an empty solid_geometry which should raise a Custom Exception
            empty_cnt = 0
            if not isinstance(geo_obj.solid_geometry, list) and \
                    not isinstance(geo_obj.solid_geometry, MultiPolygon):
                geo_obj.solid_geometry = [geo_obj.solid_geometry]

            for g in geo_obj.solid_geometry:
                if g:
                    break
                else:
                    empty_cnt += 1

            if empty_cnt == len(geo_obj.solid_geometry):
                app_obj.inform.emit('[ERROR_NOTCL] %s: %s' % (_("Empty Geometry in"), geo_obj.options["name"]))
                return 'fail'
            else:
                app_obj.inform.emit('[success] %s: %s' % (_("Isolation geometry created"), geo_obj.options["name"]))

        self.app.app_obj.new_object("geometry", iso_name, iso_init, plot=plot)

    def combined_normal(self, iso_obj, iso2geo, tools_storage, lim_area, plot=True):
        """

        :param iso_obj:         the isolated Gerber object
        :type iso_obj:          AppObjects.FlatCAMGerber.GerberObject
        :param iso2geo:         specific geometry to isolate
        :type iso2geo:          list of Shapely Polygon
        :param tools_storage:   a dictionary that holds the tools and geometry
        :type tools_storage:    dict
        :param lim_area:        if not None restrict isolation to this area
        :type lim_area:         Shapely Polygon or a list of them
        :param plot:            if to plot the resulting geometry object
        :type plot:             bool
        :return:                Isolated solid geometry
        :rtype:
        """
        log.debug("ToolIsolation.combined_normal()")

        total_solid_geometry = []

        iso_name = iso_obj.options["name"]
        geometry = iso2geo

        for tool in tools_storage:
            tool_dia = tools_storage[tool]['tooldia']
            tool_type = tools_storage[tool]['tool_type']
            tool_data = tools_storage[tool]['data']

            to_follow = tool_data['tools_iso_follow']

            # TODO what to do when the iso2geo param is not None but the Follow cb is checked
            # for the case when limited area is used .... the follow geo should be clipped too
            work_geo = geometry
            if work_geo is None:
                work_geo = iso_obj.follow_geometry if to_follow else iso_obj.solid_geometry

            iso_t = {
                'ext': 0,
                'int': 1,
                'full': 2
            }[tool_data['tools_iso_isotype']]

            passes = tool_data['tools_iso_passes']
            overlap = tool_data['tools_iso_overlap']
            overlap /= 100.0

            milling_type = tool_data['tools_iso_milling_type']

            iso_except = tool_data['tools_iso_isoexcept']

            outname = "%s_%.*f" % (iso_obj.options["name"], self.decimals, float(tool_dia))

            iso_name = outname + "_iso"
            if iso_t == 0:
                iso_name = outname + "_ext_iso"
            elif iso_t == 1:
                iso_name = outname + "_int_iso"

            # transfer the Cut Z and Vtip and VAngle values in case that we use the V-Shape tool in Gerber UI
            if tool_type.lower() == 'v':
                new_cutz = self.ui.cutz_spinner.get_value()
                new_vtipdia = self.ui.tipdia_spinner.get_value()
                new_vtipangle = self.ui.tipangle_spinner.get_value()
                tool_type = 'V'
                tool_data.update({
                    "name": iso_name,
                    "cutz": new_cutz,
                    "vtipdia": new_vtipdia,
                    "vtipangle": new_vtipangle,
                })
            else:
                tool_data.update({
                    "name": iso_name,
                })
                tool_type = 'C1'

            solid_geo = []
            for nr_pass in range(passes):
                iso_offset = tool_dia * ((2 * nr_pass + 1) / 2.0000001) - (nr_pass * overlap * tool_dia)

                # if milling type is climb then the move is counter-clockwise around features
                mill_dir = 1 if milling_type == 'cl' else 0

                iso_geo = self.generate_envelope(iso_offset, mill_dir, geometry=work_geo, env_iso_type=iso_t,
                                                 follow=to_follow, nr_passes=nr_pass)
                if iso_geo == 'fail':
                    self.app.inform.emit('[ERROR_NOTCL] %s' % _("Isolation geometry could not be generated."))
                    continue
                try:
                    for geo in iso_geo:
                        solid_geo.append(geo)
                except TypeError:
                    solid_geo.append(iso_geo)

                # ############################################################
                # ########## AREA SUBTRACTION ################################
                # ############################################################
                if iso_except:
                    self.app.proc_container.update_view_text(' %s' % _("Subtracting Geo"))
                    solid_geo = self.area_subtraction(solid_geo)

                if lim_area:
                    self.app.proc_container.update_view_text(' %s' % _("Intersecting Geo"))
                    solid_geo = self.area_intersection(solid_geo, intersection_geo=lim_area)

            tools_storage.update({
                tool: {
                    'tooldia': float(tool_dia),
                    'offset': 'Path',
                    'offset_value': 0.0,
                    'type': _('Rough'),
                    'tool_type': tool_type,
                    'data': tool_data,
                    'solid_geometry': deepcopy(solid_geo)
                }
            })

            total_solid_geometry += solid_geo

        def iso_init(geo_obj, app_obj):
            geo_obj.options["cnctooldia"] = str(tool_dia)

            geo_obj.tools = dict(tools_storage)
            geo_obj.solid_geometry = total_solid_geometry
            # even if combine is checked, one pass is still single-geo

            if len(tools_storage) > 1:
                geo_obj.multigeo = True
            else:
                if to_follow:
                    passes_no = 1
                else:
                    passes_no = float(tools_storage[0]['data']['tools_iso_passes'])
                geo_obj.multigeo = True if passes_no > 1 else False

            # detect if solid_geometry is empty and this require list flattening which is "heavy"
            # or just looking in the lists (they are one level depth) and if any is not empty
            # proceed with object creation, if there are empty and the number of them is the length
            # of the list then we have an empty solid_geometry which should raise a Custom Exception
            empty_cnt = 0
            if not isinstance(geo_obj.solid_geometry, list) and \
                    not isinstance(geo_obj.solid_geometry, MultiPolygon):
                geo_obj.solid_geometry = [geo_obj.solid_geometry]

            for g in geo_obj.solid_geometry:
                if g:
                    break
                else:
                    empty_cnt += 1

            if empty_cnt == len(geo_obj.solid_geometry):
                app_obj.inform.emit('[ERROR_NOTCL] %s: %s' % (_("Empty Geometry in"), geo_obj.options["name"]))
                return 'fail'
            else:
                app_obj.inform.emit('[success] %s: %s' % (_("Isolation geometry created"), geo_obj.options["name"]))

        self.app.app_obj.new_object("geometry", iso_name, iso_init, plot=plot)

    def area_subtraction(self, geo, subtractor_geo):
        """
        Subtracts the subtractor_geo (if present else self.solid_geometry) from the geo

        :param geo:             target geometry from which to subtract
        :param subtractor_geo:  geometry that acts as subtractor
        :return:
        """
        new_geometry = []
        target_geo = geo

        if subtractor_geo:
            sub_union = cascaded_union(subtractor_geo)
        else:
            name = self.exc_obj_combo.currentText()
            subtractor_obj = self.app.collection.get_by_name(name)
            sub_union = cascaded_union(subtractor_obj.solid_geometry)

        try:
            for geo_elem in target_geo:
                if isinstance(geo_elem, Polygon):
                    for ring in self.poly2rings(geo_elem):
                        new_geo = ring.difference(sub_union)
                        if new_geo and not new_geo.is_empty:
                            new_geometry.append(new_geo)
                elif isinstance(geo_elem, MultiPolygon):
                    for poly in geo_elem:
                        for ring in self.poly2rings(poly):
                            new_geo = ring.difference(sub_union)
                            if new_geo and not new_geo.is_empty:
                                new_geometry.append(new_geo)
                elif isinstance(geo_elem, LineString):
                    new_geo = geo_elem.difference(sub_union)
                    if new_geo:
                        if not new_geo.is_empty:
                            new_geometry.append(new_geo)
                elif isinstance(geo_elem, MultiLineString):
                    for line_elem in geo_elem:
                        new_geo = line_elem.difference(sub_union)
                        if new_geo and not new_geo.is_empty:
                            new_geometry.append(new_geo)
        except TypeError:
            if isinstance(target_geo, Polygon):
                for ring in self.poly2rings(target_geo):
                    new_geo = ring.difference(sub_union)
                    if new_geo:
                        if not new_geo.is_empty:
                            new_geometry.append(new_geo)
            elif isinstance(target_geo, LineString):
                new_geo = target_geo.difference(sub_union)
                if new_geo and not new_geo.is_empty:
                    new_geometry.append(new_geo)
            elif isinstance(target_geo, MultiLineString):
                for line_elem in target_geo:
                    new_geo = line_elem.difference(sub_union)
                    if new_geo and not new_geo.is_empty:
                        new_geometry.append(new_geo)
        return new_geometry

    def area_intersection(self, geo, intersection_geo=None):
        """
        Return the intersection geometry between geo and intersection_geo

        :param geo:                 target geometry
        :param intersection_geo:    second geometry
        :return:
        """
        new_geometry = []
        target_geo = geo

        intersect_union = cascaded_union(intersection_geo)

        try:
            for geo_elem in target_geo:
                if isinstance(geo_elem, Polygon):
                    for ring in self.poly2rings(geo_elem):
                        new_geo = ring.intersection(intersect_union)
                        if new_geo and not new_geo.is_empty:
                            new_geometry.append(new_geo)
                elif isinstance(geo_elem, MultiPolygon):
                    for poly in geo_elem:
                        for ring in self.poly2rings(poly):
                            new_geo = ring.intersection(intersect_union)
                            if new_geo and not new_geo.is_empty:
                                new_geometry.append(new_geo)
                elif isinstance(geo_elem, LineString):
                    new_geo = geo_elem.intersection(intersect_union)
                    if new_geo:
                        if not new_geo.is_empty:
                            new_geometry.append(new_geo)
                elif isinstance(geo_elem, MultiLineString):
                    for line_elem in geo_elem:
                        new_geo = line_elem.intersection(intersect_union)
                        if new_geo and not new_geo.is_empty:
                            new_geometry.append(new_geo)
        except TypeError:
            if isinstance(target_geo, Polygon):
                for ring in self.poly2rings(target_geo):
                    new_geo = ring.intersection(intersect_union)
                    if new_geo:
                        if not new_geo.is_empty:
                            new_geometry.append(new_geo)
            elif isinstance(target_geo, LineString):
                new_geo = target_geo.intersection(intersect_union)
                if new_geo and not new_geo.is_empty:
                    new_geometry.append(new_geo)
            elif isinstance(target_geo, MultiLineString):
                for line_elem in target_geo:
                    new_geo = line_elem.intersection(intersect_union)
                    if new_geo and not new_geo.is_empty:
                        new_geometry.append(new_geo)
        return new_geometry

    def on_poly_mouse_click_release(self, event):
        if self.app.is_legacy is False:
            event_pos = event.pos
            right_button = 2
            self.app.event_is_dragging = self.app.event_is_dragging
        else:
            event_pos = (event.xdata, event.ydata)
            right_button = 3
            self.app.event_is_dragging = self.app.ui.popMenu.mouse_is_panning

        try:
            x = float(event_pos[0])
            y = float(event_pos[1])
        except TypeError:
            return

        event_pos = (x, y)
        curr_pos = self.app.plotcanvas.translate_coords(event_pos)
        if self.app.grid_status():
            curr_pos = self.app.geo_editor.snap(curr_pos[0], curr_pos[1])
        else:
            curr_pos = (curr_pos[0], curr_pos[1])

        if event.button == 1:
            clicked_poly = self.find_polygon(point=(curr_pos[0], curr_pos[1]), geoset=self.grb_obj.solid_geometry)

            if self.app.selection_type is not None:
                self.selection_area_handler(self.app.pos, curr_pos, self.app.selection_type)
                self.app.selection_type = None
            elif clicked_poly:
                if clicked_poly not in self.poly_dict.values():
                    shape_id = self.app.tool_shapes.add(tolerance=self.drawing_tolerance, layer=0, shape=clicked_poly,
                                                        color=self.app.defaults['global_sel_draw_color'] + 'AF',
                                                        face_color=self.app.defaults['global_sel_draw_color'] + 'AF',
                                                        visible=True)
                    self.poly_dict[shape_id] = clicked_poly
                    self.app.inform.emit(
                        '%s: %d. %s' % (_("Added polygon"), int(len(self.poly_dict)),
                                        _("Click to add next polygon or right click to start isolation."))
                    )
                else:
                    try:
                        for k, v in list(self.poly_dict.items()):
                            if v == clicked_poly:
                                self.app.tool_shapes.remove(k)
                                self.poly_dict.pop(k)
                                break
                    except TypeError:
                        return
                    self.app.inform.emit(
                        '%s. %s' % (_("Removed polygon"),
                                    _("Click to add/remove next polygon or right click to start isolation."))
                    )

                self.app.tool_shapes.redraw()
            else:
                self.app.inform.emit(_("No polygon detected under click position."))
        elif event.button == right_button and self.app.event_is_dragging is False:
            # restore the Grid snapping if it was active before
            if self.grid_status_memory is True:
                self.app.ui.grid_snap_btn.trigger()

            if self.app.is_legacy is False:
                self.app.plotcanvas.graph_event_disconnect('mouse_release', self.on_poly_mouse_click_release)
                self.app.plotcanvas.graph_event_disconnect('key_press', self.on_key_pres)
            else:
                self.app.plotcanvas.graph_event_disconnect(self.mr)
                self.app.plotcanvas.graph_event_disconnect(self.kp)

            self.app.mr = self.app.plotcanvas.graph_event_connect('mouse_release',
                                                                  self.app.on_mouse_click_release_over_plot)

            self.app.tool_shapes.clear(update=True)

            if self.poly_dict:
                poly_list = deepcopy(list(self.poly_dict.values()))
                self.isolate(isolated_obj=self.grb_obj, geometry=poly_list)
                self.poly_dict.clear()
            else:
                self.app.inform.emit('[ERROR_NOTCL] %s' % _("List of single polygons is empty. Aborting."))

    def 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])])

        # delete previous selection shape
        self.app.delete_selection_shape()

        added_poly_count = 0
        try:
            for geo in self.solid_geometry:
                if geo not in self.poly_dict.values():
                    if sel_type is True:
                        if geo.within(poly_selection):
                            shape_id = self.app.tool_shapes.add(tolerance=self.drawing_tolerance, layer=0,
                                                                shape=geo,
                                                                color=self.app.defaults['global_sel_draw_color'] + 'AF',
                                                                face_color=self.app.defaults[
                                                                               'global_sel_draw_color'] + 'AF',
                                                                visible=True)
                            self.poly_dict[shape_id] = geo
                            added_poly_count += 1
                    else:
                        if poly_selection.intersects(geo):
                            shape_id = self.app.tool_shapes.add(tolerance=self.drawing_tolerance, layer=0,
                                                                shape=geo,
                                                                color=self.app.defaults['global_sel_draw_color'] + 'AF',
                                                                face_color=self.app.defaults[
                                                                               'global_sel_draw_color'] + 'AF',
                                                                visible=True)
                            self.poly_dict[shape_id] = geo
                            added_poly_count += 1
        except TypeError:
            if self.solid_geometry not in self.poly_dict.values():
                if sel_type is True:
                    if self.solid_geometry.within(poly_selection):
                        shape_id = self.app.tool_shapes.add(tolerance=self.drawing_tolerance, layer=0,
                                                            shape=self.solid_geometry,
                                                            color=self.app.defaults['global_sel_draw_color'] + 'AF',
                                                            face_color=self.app.defaults[
                                                                           'global_sel_draw_color'] + 'AF',
                                                            visible=True)
                        self.poly_dict[shape_id] = self.solid_geometry
                        added_poly_count += 1
                else:
                    if poly_selection.intersects(self.solid_geometry):
                        shape_id = self.app.tool_shapes.add(tolerance=self.drawing_tolerance, layer=0,
                                                            shape=self.solid_geometry,
                                                            color=self.app.defaults['global_sel_draw_color'] + 'AF',
                                                            face_color=self.app.defaults[
                                                                           'global_sel_draw_color'] + 'AF',
                                                            visible=True)
                        self.poly_dict[shape_id] = self.solid_geometry
                        added_poly_count += 1

        if added_poly_count > 0:
            self.app.tool_shapes.redraw()
            self.app.inform.emit(
                '%s: %d. %s' % (_("Added polygon"),
                                int(added_poly_count),
                                _("Click to add next polygon or right click to start isolation."))
            )
        else:
            self.app.inform.emit(_("No polygon in selection."))

    # To be called after clicking on the plot.
    def on_mouse_release(self, event):
        if self.app.is_legacy is False:
            event_pos = event.pos
            # event_is_dragging = event.is_dragging
            right_button = 2
        else:
            event_pos = (event.xdata, event.ydata)
            # event_is_dragging = self.app.plotcanvas.is_dragging
            right_button = 3

        event_pos = self.app.plotcanvas.translate_coords(event_pos)
        if self.app.grid_status():
            curr_pos = self.app.geo_editor.snap(event_pos[0], event_pos[1])
        else:
            curr_pos = (event_pos[0], event_pos[1])

        x1, y1 = curr_pos[0], curr_pos[1]

        shape_type = self.area_shape_radio.get_value()

        # do clear area only for left mouse clicks
        if event.button == 1:
            if shape_type == "square":
                if self.first_click is False:
                    self.first_click = True
                    self.app.inform.emit('[WARNING_NOTCL] %s' % _("Click the end point of the paint area."))

                    self.cursor_pos = self.app.plotcanvas.translate_coords(event_pos)
                    if self.app.grid_status():
                        self.cursor_pos = self.app.geo_editor.snap(event_pos[0], event_pos[1])
                else:
                    self.app.inform.emit(_("Zone added. Click to start adding next zone or right click to finish."))
                    self.app.delete_selection_shape()

                    x0, y0 = self.cursor_pos[0], self.cursor_pos[1]

                    pt1 = (x0, y0)
                    pt2 = (x1, y0)
                    pt3 = (x1, y1)
                    pt4 = (x0, y1)

                    new_rectangle = Polygon([pt1, pt2, pt3, pt4])
                    self.sel_rect.append(new_rectangle)

                    # add a temporary shape on canvas
                    self.draw_tool_selection_shape(old_coords=(x0, y0), coords=(x1, y1))

                    self.first_click = False
                    return
            else:
                self.points.append((x1, y1))

                if len(self.points) > 1:
                    self.poly_drawn = True
                    self.app.inform.emit(_("Click on next Point or click right mouse button to complete ..."))

                return ""
        elif event.button == right_button and self.mouse_is_dragging is False:

            shape_type = self.area_shape_radio.get_value()

            if shape_type == "square":
                self.first_click = False
            else:
                # if we finish to add a polygon
                if self.poly_drawn is True:
                    try:
                        # try to add the point where we last clicked if it is not already in the self.points
                        last_pt = (x1, y1)
                        if last_pt != self.points[-1]:
                            self.points.append(last_pt)
                    except IndexError:
                        pass

                    # we need to add a Polygon and a Polygon can be made only from at least 3 points
                    if len(self.points) > 2:
                        self.delete_moving_selection_shape()
                        pol = Polygon(self.points)
                        # do not add invalid polygons even if they are drawn by utility geometry
                        if pol.is_valid:
                            self.sel_rect.append(pol)
                            self.draw_selection_shape_polygon(points=self.points)
                            self.app.inform.emit(
                                _("Zone added. Click to start adding next zone or right click to finish."))

                    self.points = []
                    self.poly_drawn = False
                    return

            self.delete_tool_selection_shape()

            if self.app.is_legacy is False:
                self.app.plotcanvas.graph_event_disconnect('mouse_release', self.on_mouse_release)
                self.app.plotcanvas.graph_event_disconnect('mouse_move', self.on_mouse_move)
                self.app.plotcanvas.graph_event_disconnect('key_press', self.on_key_press)
            else:
                self.app.plotcanvas.graph_event_disconnect(self.mr)
                self.app.plotcanvas.graph_event_disconnect(self.mm)
                self.app.plotcanvas.graph_event_disconnect(self.kp)

            self.app.mp = self.app.plotcanvas.graph_event_connect('mouse_press',
                                                                  self.app.on_mouse_click_over_plot)
            self.app.mm = self.app.plotcanvas.graph_event_connect('mouse_move',
                                                                  self.app.on_mouse_move_over_plot)
            self.app.mr = self.app.plotcanvas.graph_event_connect('mouse_release',
                                                                  self.app.on_mouse_click_release_over_plot)

            if len(self.sel_rect) == 0:
                return

            self.sel_rect = cascaded_union(self.sel_rect)
            self.isolate(isolated_obj=self.grb_obj, limited_area=self.sel_rect, plot=True)
            self.sel_rect = []

    # called on mouse move
    def on_mouse_move(self, event):
        shape_type = self.area_shape_radio.get_value()

        if self.app.is_legacy is False:
            event_pos = event.pos
            event_is_dragging = event.is_dragging
            # right_button = 2
        else:
            event_pos = (event.xdata, event.ydata)
            event_is_dragging = self.app.plotcanvas.is_dragging
            # right_button = 3

        curr_pos = self.app.plotcanvas.translate_coords(event_pos)

        # detect mouse dragging motion
        if event_is_dragging is True:
            self.mouse_is_dragging = True
        else:
            self.mouse_is_dragging = False

        # update the cursor position
        if self.app.grid_status():
            # Update cursor
            curr_pos = self.app.geo_editor.snap(curr_pos[0], curr_pos[1])

            self.app.app_cursor.set_data(np.asarray([(curr_pos[0], curr_pos[1])]),
                                         symbol='++', edge_color=self.app.cursor_color_3D,
                                         edge_width=self.app.defaults["global_cursor_width"],
                                         size=self.app.defaults["global_cursor_size"])

        if self.cursor_pos is None:
            self.cursor_pos = (0, 0)

        self.app.dx = curr_pos[0] - float(self.cursor_pos[0])
        self.app.dy = curr_pos[1] - float(self.cursor_pos[1])

        # # update the positions on status bar
        self.app.ui.position_label.setText("&nbsp;<b>X</b>: %.4f&nbsp;&nbsp;   "
                                           "<b>Y</b>: %.4f&nbsp;" % (curr_pos[0], curr_pos[1]))
        # self.app.ui.rel_position_label.setText("<b>Dx</b>: %.4f&nbsp;&nbsp;  <b>Dy</b>: "
        #                                        "%.4f&nbsp;&nbsp;&nbsp;&nbsp;" % (self.app.dx, self.app.dy))

        units = self.app.defaults["units"].lower()
        self.app.plotcanvas.text_hud.text = \
            'Dx:\t{:<.4f} [{:s}]\nDy:\t{:<.4f} [{:s}]\n\nX:  \t{:<.4f} [{:s}]\nY:  \t{:<.4f} [{:s}]'.format(
                self.app.dx, units, self.app.dy, units, curr_pos[0], units, curr_pos[1], units)

        # draw the utility geometry
        if shape_type == "square":
            if self.first_click:
                self.app.delete_selection_shape()
                self.app.draw_moving_selection_shape(old_coords=(self.cursor_pos[0], self.cursor_pos[1]),
                                                     coords=(curr_pos[0], curr_pos[1]))
        else:
            self.delete_moving_selection_shape()
            self.draw_moving_selection_shape_poly(points=self.points, data=(curr_pos[0], curr_pos[1]))

    def on_key_press(self, event):
        # modifiers = QtWidgets.QApplication.keyboardModifiers()
        # matplotlib_key_flag = False

        # events out of the self.app.collection view (it's about Project Tab) are of type int
        if type(event) is int:
            key = event
        # events from the GUI are of type QKeyEvent
        elif type(event) == QtGui.QKeyEvent:
            key = event.key()
        elif isinstance(event, mpl_key_event):  # MatPlotLib key events are trickier to interpret than the rest
            # matplotlib_key_flag = True

            key = event.key
            key = QtGui.QKeySequence(key)

            # check for modifiers
            key_string = key.toString().lower()
            if '+' in key_string:
                mod, __, key_text = key_string.rpartition('+')
                if mod.lower() == 'ctrl':
                    # modifiers = QtCore.Qt.ControlModifier
                    pass
                elif mod.lower() == 'alt':
                    # modifiers = QtCore.Qt.AltModifier
                    pass
                elif mod.lower() == 'shift':
                    # modifiers = QtCore.Qt.ShiftModifier
                    pass
                else:
                    # modifiers = QtCore.Qt.NoModifier
                    pass
                key = QtGui.QKeySequence(key_text)

        # events from Vispy are of type KeyEvent
        else:
            key = event.key

        if key == QtCore.Qt.Key_Escape or key == 'Escape':
            if self.app.is_legacy is False:
                self.app.plotcanvas.graph_event_disconnect('mouse_release', self.on_mouse_release)
                self.app.plotcanvas.graph_event_disconnect('mouse_move', self.on_mouse_move)
                self.app.plotcanvas.graph_event_disconnect('key_press', self.on_key_press)
            else:
                self.app.plotcanvas.graph_event_disconnect(self.mr)
                self.app.plotcanvas.graph_event_disconnect(self.mm)
                self.app.plotcanvas.graph_event_disconnect(self.kp)

            self.app.mp = self.app.plotcanvas.graph_event_connect('mouse_press',
                                                                  self.app.on_mouse_click_over_plot)
            self.app.mm = self.app.plotcanvas.graph_event_connect('mouse_move',
                                                                  self.app.on_mouse_move_over_plot)
            self.app.mr = self.app.plotcanvas.graph_event_connect('mouse_release',
                                                                  self.app.on_mouse_click_release_over_plot)
            self.points = []
            self.poly_drawn = False
            self.delete_moving_selection_shape()
            self.delete_tool_selection_shape()

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

    def generate_envelope(self, offset, invert, geometry=None, env_iso_type=2, follow=None, nr_passes=0):
        """
        Isolation_geometry produces an envelope that is going on the left of the geometry
        (the copper features). To leave the least amount of burrs on the features
        the tool needs to travel on the right side of the features (this is called conventional milling)
        the first pass is the one cutting all of the features, so it needs to be reversed
        the other passes overlap preceding ones and cut the left over copper. It is better for them
        to cut on the right side of the left over copper i.e on the left side of the features.

        :param offset:          Offset distance to be passed to the obj.isolation_geometry() method
        :type offset:           float
        :param invert:          If to invert the direction of geometry (CW to CCW or reverse)
        :type invert:           int
        :param geometry:        Shapely Geometry for which t ogenerate envelope
        :type geometry:
        :param env_iso_type:    type of isolation, can be 0 = exteriors or 1 = interiors or 2 = both (complete)
        :type env_iso_type:     int
        :param follow:          If the kind of isolation is a "follow" one
        :type follow:           bool
        :param nr_passes:       Number of passes
        :type nr_passes:        int
        :return:                The buffered geometry
        :rtype:                 MultiPolygon or Polygon
        """

        if follow:
            geom = self.grb_obj.isolation_geometry(offset, geometry=geometry, follow=follow)
            return geom
        else:
            try:
                geom = self.grb_obj.isolation_geometry(offset, geometry=geometry, iso_type=env_iso_type,
                                                       passes=nr_passes)
            except Exception as e:
                log.debug('ToolIsolation.generate_envelope() --> %s' % str(e))
                return 'fail'

        if invert:
            try:
                pl = []
                for p in geom:
                    if p is not None:
                        if isinstance(p, Polygon):
                            pl.append(Polygon(p.exterior.coords[::-1], p.interiors))
                        elif isinstance(p, LinearRing):
                            pl.append(Polygon(p.coords[::-1]))
                geom = MultiPolygon(pl)
            except TypeError:
                if isinstance(geom, Polygon) and geom is not None:
                    geom = Polygon(geom.exterior.coords[::-1], geom.interiors)
                elif isinstance(geom, LinearRing) and geom is not None:
                    geom = Polygon(geom.coords[::-1])
                else:
                    log.debug("ToolIsolation.generate_envelope() Error --> Unexpected Geometry %s" %
                              type(geom))
            except Exception as e:
                log.debug("ToolIsolation.generate_envelope() Error --> %s" % str(e))
                return 'fail'
        return geom

    def on_iso_tool_add_from_db_executed(self, tool):
        """
        Here add the tool from DB  in the selected geometry object
        :return:
        """
        tool_from_db = deepcopy(tool)

        res = self.on_tool_from_db_inserted(tool=tool_from_db)

        for idx in range(self.app.ui.plot_tab_area.count()):
            if self.app.ui.plot_tab_area.tabText(idx) == _("Tools Database"):
                wdg = self.app.ui.plot_tab_area.widget(idx)
                wdg.deleteLater()
                self.app.ui.plot_tab_area.removeTab(idx)

        if res == 'fail':
            return
        self.app.inform.emit('[success] %s' % _("Tool from DB added in Tool Table."))

        # select last tool added
        toolid = res
        for row in range(self.tools_table.rowCount()):
            if int(self.tools_table.item(row, 3).text()) == toolid:
                self.tools_table.selectRow(row)
        self.on_row_selection_change()

    def on_tool_from_db_inserted(self, tool):
        """
        Called from the Tools DB object through a App method when adding a tool from Tools Database
        :param tool: a dict with the tool data
        :return: None
        """

        self.ui_disconnect()
        self.units = self.app.defaults['units'].upper()

        tooldia = float(tool['tooldia'])

        # construct a list of all 'tooluid' in the self.tools
        tool_uid_list = []
        for tooluid_key in self.iso_tools:
            tool_uid_item = int(tooluid_key)
            tool_uid_list.append(tool_uid_item)

        # find maximum from the temp_uid, add 1 and this is the new 'tooluid'
        if not tool_uid_list:
            max_uid = 0
        else:
            max_uid = max(tool_uid_list)
        tooluid = max_uid + 1

        tooldia = float('%.*f' % (self.decimals, tooldia))

        tool_dias = []
        for k, v in self.iso_tools.items():
            for tool_v in v.keys():
                if tool_v == 'tooldia':
                    tool_dias.append(float('%.*f' % (self.decimals, (v[tool_v]))))

        if float('%.*f' % (self.decimals, tooldia)) in tool_dias:
            self.app.inform.emit('[WARNING_NOTCL] %s' % _("Cancelled. Tool already in Tool Table."))
            self.ui_connect()
            return 'fail'

        self.iso_tools.update({
            tooluid: {
                'tooldia': float('%.*f' % (self.decimals, tooldia)),
                'offset': tool['offset'],
                'offset_value': tool['offset_value'],
                'type': tool['type'],
                'tool_type': tool['tool_type'],
                'data': deepcopy(tool['data']),
                'solid_geometry': []
            }
        })
        self.iso_tools[tooluid]['data']['name'] = '_ncc'

        self.app.inform.emit('[success] %s' % _("New tool added to Tool Table."))

        self.ui_connect()
        self.build_ui()

        # if self.tools_table.rowCount() != 0:
        #     self.param_frame.setDisabled(False)

    def on_tool_add_from_db_clicked(self):
        """
        Called when the user wants to add a new tool from Tools Database. It will create the Tools Database object
        and display the Tools Database tab in the form needed for the Tool adding
        :return: None
        """

        # if the Tools Database is already opened focus on it
        for idx in range(self.app.ui.plot_tab_area.count()):
            if self.app.ui.plot_tab_area.tabText(idx) == _("Tools Database"):
                self.app.ui.plot_tab_area.setCurrentWidget(self.app.tools_db_tab)
                break
        self.app.on_tools_database(source='iso')
        self.app.tools_db_tab.ok_to_add = True
        self.app.tools_db_tab.buttons_frame.hide()
        self.app.tools_db_tab.add_tool_from_db.show()
        self.app.tools_db_tab.cancel_tool_from_db.show()

    def reset_fields(self):
        self.object_combo.setRootModelIndex(self.app.collection.index(0, 0, QtCore.QModelIndex()))

    def reset_usage(self):
        self.obj_name = ""
        self.grb_obj = None

        self.first_click = False
        self.cursor_pos = None
        self.mouse_is_dragging = False

        prog_plot = True if self.app.defaults["tools_iso_plotting"] == 'progressive' else False
        if prog_plot:
            self.temp_shapes.clear(update=True)

        self.sel_rect = []