FlatCAM/flatcamGUI/PlotCanvasLegacy.py

############################################################
# FlatCAM: 2D Post-processing for Manufacturing            #
# http://caram.cl/software/flatcam                         #
# Author: Juan Pablo Caram (c)                             #
# Date: 2/5/2014                                           #
# MIT Licence                                              #
# Modified by Marius Stanciu 09/21/2019                    #
############################################################

from PyQt5 import QtCore
from PyQt5.QtCore import pyqtSignal

# needed for legacy mode
# Used for solid polygons in Matplotlib
from descartes.patch import PolygonPatch

from shapely.geometry import Polygon, LineString, LinearRing

from copy import deepcopy
import logging

import gettext
import FlatCAMTranslation as fcTranslate
import builtins

# Prevent conflict with Qt5 and above.
from matplotlib import use as mpl_use
mpl_use("Qt5Agg")
from matplotlib.figure import Figure
from matplotlib.backends.backend_qt5agg import FigureCanvasQTAgg as FigureCanvas
from matplotlib.lines import Line2D
# from matplotlib.widgets import Cursor

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


log = logging.getLogger('base')


class CanvasCache(QtCore.QObject):
    """

    Case story #1:

    1) No objects in the project.
    2) Object is created (new_object() emits object_created(obj)).
       on_object_created() adds (i) object to collection and emits
       (ii) new_object_available() then calls (iii) object.plot()
    3) object.plot() creates axes if necessary on
       app.collection.figure. Then plots on it.
    4) Plots on a cache-size canvas (in background).
    5) Plot completes. Bitmap is generated.
    6) Visible canvas is painted.

    """

    # Signals:
    # A bitmap is ready to be displayed.
    new_screen = QtCore.pyqtSignal()

    def __init__(self, plotcanvas, app, dpi=50):

        super(CanvasCache, self).__init__()

        self.app = app

        self.plotcanvas = plotcanvas
        self.dpi = dpi

        self.figure = Figure(dpi=dpi)

        self.axes = self.figure.add_axes([0.0, 0.0, 1.0, 1.0], alpha=1.0)
        self.axes.set_frame_on(False)
        self.axes.set_xticks([])
        self.axes.set_yticks([])

        if self.app.defaults['global_theme'] == 'white':
            self.axes.set_facecolor('#FFFFFF')
        else:
            self.axes.set_facecolor('#000000')

        self.canvas = FigureCanvas(self.figure)

        self.cache = None

    def run(self):

        log.debug("CanvasCache Thread Started!")
        self.plotcanvas.update_screen_request.connect(self.on_update_req)

    def on_update_req(self, extents):
        """
        Event handler for an updated display request.

        :param extents: [xmin, xmax, ymin, ymax, zoom(optional)]
        """

        # log.debug("Canvas update requested: %s" % str(extents))

        # Note: This information below might be out of date. Establish
        # a protocol regarding when to change the canvas in the main
        # thread and when to check these values here in the background,
        # or pass this data in the signal (safer).
        # log.debug("Size: %s [px]" % str(self.plotcanvas.get_axes_pixelsize()))
        # log.debug("Density: %s [units/px]" % str(self.plotcanvas.get_density()))

        # Move the requested screen portion to the main thread
        # and inform about the update:

        self.new_screen.emit()

        # Continue to update the cache.

    # def on_new_object_available(self):
    #
    #     log.debug("A new object is available. Should plot it!")


class PlotCanvasLegacy(QtCore.QObject):
    """
    Class handling the plotting area in the application.
    """

    # Signals:
    # Request for new bitmap to display. The parameter
    # is a list with [xmin, xmax, ymin, ymax, zoom(optional)]
    update_screen_request = QtCore.pyqtSignal(list)

    double_click = QtCore.pyqtSignal(object)

    def __init__(self, container, app):
        """
        The constructor configures the Matplotlib figure that
        will contain all plots, creates the base axes and connects
        events to the plotting area.

        :param container: The parent container in which to draw plots.
        :rtype: PlotCanvas
        """

        super(PlotCanvasLegacy, self).__init__()

        self.app = app

        if self.app.defaults['global_theme'] == 'white':
            theme_color = '#FFFFFF'
            tick_color = '#000000'
        else:
            theme_color = '#000000'
            tick_color = '#FFFFFF'

        # workspace lines; I didn't use the rectangle because I didn't want to add another VisPy Node,
        # which might decrease performance
        # self.b_line, self.r_line, self.t_line, self.l_line = None, None, None, None
        self.workspace_line = None

        self.pagesize_dict = {}
        self.pagesize_dict.update(
            {
                'A0': (841, 1189),
                'A1': (594, 841),
                'A2': (420, 594),
                'A3': (297, 420),
                'A4': (210, 297),
                'A5': (148, 210),
                'A6': (105, 148),
                'A7': (74, 105),
                'A8': (52, 74),
                'A9': (37, 52),
                'A10': (26, 37),

                'B0': (1000, 1414),
                'B1': (707, 1000),
                'B2': (500, 707),
                'B3': (353, 500),
                'B4': (250, 353),
                'B5': (176, 250),
                'B6': (125, 176),
                'B7': (88, 125),
                'B8': (62, 88),
                'B9': (44, 62),
                'B10': (31, 44),

                'C0': (917, 1297),
                'C1': (648, 917),
                'C2': (458, 648),
                'C3': (324, 458),
                'C4': (229, 324),
                'C5': (162, 229),
                'C6': (114, 162),
                'C7': (81, 114),
                'C8': (57, 81),
                'C9': (40, 57),
                'C10': (28, 40),

                # American paper sizes
                'LETTER': (8.5*25.4, 11*25.4),
                'LEGAL': (8.5*25.4, 14*25.4),
                'ELEVENSEVENTEEN': (11*25.4, 17*25.4),

                # From https://en.wikipedia.org/wiki/Paper_size
                'JUNIOR_LEGAL': (5*25.4, 8*25.4),
                'HALF_LETTER': (5.5*25.4, 8*25.4),
                'GOV_LETTER': (8*25.4, 10.5*25.4),
                'GOV_LEGAL': (8.5*25.4, 13*25.4),
                'LEDGER': (17*25.4, 11*25.4),
            }
        )

        # Options
        self.x_margin = 15  # pixels
        self.y_margin = 25  # Pixels

        # Parent container
        self.container = container

        # Plots go onto a single matplotlib.figure
        self.figure = Figure(dpi=50)
        self.figure.patch.set_visible(True)
        self.figure.set_facecolor(theme_color)

        # These axes show the ticks and grid. No plotting done here.
        # New axes must have a label, otherwise mpl returns an existing one.
        self.axes = self.figure.add_axes([0.05, 0.05, 0.9, 0.9], label="base", alpha=0.0)
        self.axes.set_aspect(1)
        self.axes.grid(True, color='gray')
        self.h_line = self.axes.axhline(color=(0.70, 0.3, 0.3), linewidth=2)
        self.v_line = self.axes.axvline(color=(0.70, 0.3, 0.3), linewidth=2)

        self.axes.tick_params(axis='x', color=tick_color, labelcolor=tick_color)
        self.axes.tick_params(axis='y', color=tick_color, labelcolor=tick_color)
        self.axes.spines['bottom'].set_color(tick_color)
        self.axes.spines['top'].set_color(tick_color)
        self.axes.spines['right'].set_color(tick_color)
        self.axes.spines['left'].set_color(tick_color)

        self.axes.set_facecolor(theme_color)

        self.ch_line = None
        self.cv_line = None

        # The canvas is the top level container (FigureCanvasQTAgg)
        self.canvas = FigureCanvas(self.figure)

        self.canvas.setFocusPolicy(QtCore.Qt.ClickFocus)
        self.canvas.setFocus()
        self.native = self.canvas

        self.adjust_axes(-10, -10, 100, 100)
        # self.canvas.set_can_focus(True)  # For key press

        # Attach to parent
        # self.container.attach(self.canvas, 0, 0, 600, 400)
        self.container.addWidget(self.canvas)  # Qt

        # Copy a bitmap of the canvas for quick animation.
        # Update every time the canvas is re-drawn.
        self.background = self.canvas.copy_from_bbox(self.axes.bbox)

        # ################### NOT IMPLEMENTED YET - EXPERIMENTAL #######################
        # ## Bitmap Cache
        # self.cache = CanvasCache(self, self.app)
        # self.cache_thread = QtCore.QThread()
        # self.cache.moveToThread(self.cache_thread)
        # # super(PlotCanvas, self).connect(self.cache_thread, QtCore.SIGNAL("started()"), self.cache.run)
        # self.cache_thread.started.connect(self.cache.run)
        #
        # self.cache_thread.start()
        # self.cache.new_screen.connect(self.on_new_screen)
        # ##############################################################################

        # Events
        self.mp = self.graph_event_connect('button_press_event', self.on_mouse_press)
        self.mr = self.graph_event_connect('button_release_event', self.on_mouse_release)
        self.mm = self.graph_event_connect('motion_notify_event', self.on_mouse_move)
        # self.canvas.connect('configure-event', self.auto_adjust_axes)
        self.aaa = self.graph_event_connect('resize_event', self.auto_adjust_axes)
        # self.canvas.add_events(Gdk.EventMask.SMOOTH_SCROLL_MASK)
        # self.canvas.connect("scroll-event", self.on_scroll)
        self.osc = self.graph_event_connect('scroll_event', self.on_scroll)
        # self.graph_event_connect('key_press_event', self.on_key_down)
        # self.graph_event_connect('key_release_event', self.on_key_up)
        self.odr = self.graph_event_connect('draw_event', self.on_draw)

        self.key = None

        self.pan_axes = []
        self.panning = False
        self.mouse = [0, 0]
        self.big_cursor = False
        self.big_cursor_isdisabled = None

        # signal is the mouse is dragging
        self.is_dragging = False

        # signal if there is a doubleclick
        self.is_dblclk = False

        # draw a rectangle made out of 4 lines on the canvas to serve as a hint for the work area
        # all CNC have a limited workspace
        if self.app.defaults['global_workspace'] is True:
            self.draw_workspace(workspace_size=self.app.defaults["global_workspaceT"])

    def draw_workspace(self, workspace_size):
        """
        Draw a rectangular shape on canvas to specify our valid workspace.
        :param workspace_size: the workspace size; tuple
        :return:
        """
        try:
            if self.app.defaults['units'].upper() == 'MM':
                dims = self.pagesize_dict[workspace_size]
            else:
                dims = (self.pagesize_dict[workspace_size][0]/25.4, self.pagesize_dict[workspace_size][1]/25.4)
        except Exception as e:
            log.debug("PlotCanvasLegacy.draw_workspace() --> %s" % str(e))
            return

        if self.app.defaults['global_workspace_orientation'] == 'l':
            dims = (dims[1], dims[0])

        xdata = [0, dims[0], dims[0], 0, 0]
        ydata = [0, 0, dims[1], dims[1], 0]

        if self.workspace_line not in self.axes.lines:
            self.workspace_line = Line2D(xdata=xdata, ydata=ydata, linewidth=2, antialiased=True, color='#b34d4d')
            self.axes.add_line(self.workspace_line)
            self.canvas.draw()

    def delete_workspace(self):
        try:
            self.axes.lines.remove(self.workspace_line)
            self.canvas.draw()
        except Exception:
            pass

    def graph_event_connect(self, event_name, callback):
        """
        Attach an event handler to the canvas through the Matplotlib interface.

        :param event_name: Name of the event
        :type event_name: str
        :param callback: Function to call
        :type callback: func
        :return: Connection id
        :rtype: int
        """
        if event_name == 'mouse_move':
            event_name = 'motion_notify_event'
        if event_name == 'mouse_press':
            event_name = 'button_press_event'
        if event_name == 'mouse_release':
            event_name = 'button_release_event'
        if event_name == 'mouse_double_click':
            return self.double_click.connect(callback)

        if event_name == 'key_press':
            event_name = 'key_press_event'

        return self.canvas.mpl_connect(event_name, callback)

    def graph_event_disconnect(self, cid):
        """
        Disconnect callback with the give id.
        :param cid: Callback id.
        :return: None
        """

        self.canvas.mpl_disconnect(cid)

    def on_new_screen(self):
        pass
        # log.debug("Cache updated the screen!")

    def new_cursor(self, axes=None, big=None):
        # if axes is None:
        #     c = MplCursor(axes=self.axes, color='black', linewidth=1)
        # else:
        #     c = MplCursor(axes=axes, color='black', linewidth=1)

        if self.app.defaults["global_cursor_color_enabled"]:
            color = self.app.defaults["global_cursor_color"]
        else:
            if self.app.defaults['global_theme'] == 'white':
                color = '#000000'
            else:
                color = '#FFFFFF'

        if big is True:
            self.big_cursor = True
            self.ch_line = self.axes.axhline(color=color, linewidth=self.app.defaults["global_cursor_width"])
            self.cv_line = self.axes.axvline(color=color, linewidth=self.app.defaults["global_cursor_width"])
            self.big_cursor_isdisabled = False
        else:
            self.big_cursor = False

        c = FakeCursor()
        c.mouse_state_updated.connect(self.clear_cursor)

        return c

    def draw_cursor(self, x_pos, y_pos, color=None):
        """
        Draw a cursor at the mouse grid snapped position

        :param x_pos: mouse x position
        :param y_pos: mouse y position
        :param color: custom color of the mouse
        :return:
        """

        # there is no point in drawing mouse cursor when panning as it jumps in a confusing way
        if self.app.app_cursor.enabled is True and self.panning is False:
            if color:
                color = color
            else:
                if self.app.defaults['global_theme'] == 'white':
                    color = '#000000'
                else:
                    color = '#FFFFFF'

            if self.big_cursor is False:
                try:
                    x, y = self.app.geo_editor.snap(x_pos, y_pos)

                    # Pointer (snapped)
                    # The size of the cursor is multiplied by 1.65 because that value made the cursor similar with the
                    # one in the OpenGL(3D) graphic engine
                    pointer_size = int(float(self.app.defaults["global_cursor_size"]) * 1.65)
                    elements = self.axes.plot(x, y, '+', color=color, ms=pointer_size,
                                              mew=self.app.defaults["global_cursor_width"], animated=True)
                    for el in elements:
                        self.axes.draw_artist(el)
                except Exception as e:
                    # this happen at app initialization since self.app.geo_editor does not exist yet
                    # I could reshuffle the object instantiating order but what's the point?
                    # I could crash something else and that's pythonic, too
                    log.debug("PlotCanvasLegacy.draw_cursor() big_cursor is False --> %s" % str(e))
            else:
                try:
                    self.ch_line.set_markeredgewidth(self.app.defaults["global_cursor_width"])
                    self.cv_line.set_markeredgewidth(self.app.defaults["global_cursor_width"])
                except Exception:
                    pass

                try:
                    x, y = self.app.geo_editor.snap(x_pos, y_pos)
                    self.ch_line.set_ydata(y)
                    self.cv_line.set_xdata(x)
                except Exception:
                    # this happen at app initialization since self.app.geo_editor does not exist yet
                    # I could reshuffle the object instantiating order but what's the point?
                    # I could crash something else and that's pythonic, too
                    pass
                self.canvas.draw_idle()

        self.canvas.blit(self.axes.bbox)

    def clear_cursor(self, state):
        if state is True:
            if self.big_cursor is True and self.big_cursor_isdisabled is True:
                if self.app.defaults["global_cursor_color_enabled"]:
                    color = self.app.defaults["global_cursor_color"]
                else:
                    if self.app.defaults['global_theme'] == 'white':
                        color = '#000000'
                    else:
                        color = '#FFFFFF'

                self.ch_line = self.axes.axhline(color=color, linewidth=self.app.defaults["global_cursor_width"])
                self.cv_line = self.axes.axvline(color=color, linewidth=self.app.defaults["global_cursor_width"])
                self.big_cursor_isdisabled = False
            if self.app.defaults["global_cursor_color_enabled"] is True:
                self.draw_cursor(x_pos=self.mouse[0], y_pos=self.mouse[1], color=self.app.cursor_color_3D)
            else:
                self.draw_cursor(x_pos=self.mouse[0], y_pos=self.mouse[1])
        else:
            if self.big_cursor is True:
                self.big_cursor_isdisabled = True
                try:
                    self.ch_line.remove()
                    self.cv_line.remove()
                    self.canvas.draw_idle()
                except Exception as e:
                    log.debug("PlotCanvasLegacy.clear_cursor() big_cursor is True --> %s" % str(e))
            self.canvas.restore_region(self.background)
            self.canvas.blit(self.axes.bbox)

    def on_key_down(self, event):
        """

        :param event:
        :return:
        """
        log.debug('on_key_down(): ' + str(event.key))
        self.key = event.key

    def on_key_up(self, event):
        """

        :param event:
        :return:
        """
        self.key = None

    def connect(self, event_name, callback):
        """
        Attach an event handler to the canvas through the native Qt interface.

        :param event_name: Name of the event
        :type event_name: str
        :param callback: Function to call
        :type callback: function
        :return: Nothing
        """
        self.canvas.connect(event_name, callback)

    def clear(self):
        """
        Clears axes and figure.

        :return: None
        """

        # Clear
        self.axes.cla()
        try:
            self.figure.clf()
        except KeyError:
            log.warning("KeyError in MPL figure.clf()")

        # Re-build
        self.figure.add_axes(self.axes)
        self.axes.set_aspect(1)
        self.axes.grid(True)
        self.axes.axhline(color=(0.70, 0.3, 0.3), linewidth=2)
        self.axes.axvline(color=(0.70, 0.3, 0.3), linewidth=2)

        self.adjust_axes(-10, -10, 100, 100)

        # Re-draw
        self.canvas.draw_idle()

    def redraw(self):
        """
        Created only to serve for compatibility with the VisPy plotcanvas (the other graphic engine, 3D)
        :return:
        """
        self.clear()

    def adjust_axes(self, xmin, ymin, xmax, ymax):
        """
        Adjusts all axes while maintaining the use of the whole canvas
        and an aspect ratio to 1:1 between x and y axes. The parameters are an original
        request that will be modified to fit these restrictions.

        :param xmin: Requested minimum value for the X axis.
        :type xmin: float
        :param ymin: Requested minimum value for the Y axis.
        :type ymin: float
        :param xmax: Requested maximum value for the X axis.
        :type xmax: float
        :param ymax: Requested maximum value for the Y axis.
        :type ymax: float
        :return: None
        """

        # FlatCAMApp.App.log.debug("PC.adjust_axes()")

        if not self.app.collection.get_list():
            xmin = -10
            ymin = -10
            xmax = 100
            ymax = 100

        width = xmax - xmin
        height = ymax - ymin
        try:
            r = width / height
        except ZeroDivisionError:
            log.error("Height is %f" % height)
            return
        canvas_w, canvas_h = self.canvas.get_width_height()
        canvas_r = float(canvas_w) / canvas_h
        x_ratio = float(self.x_margin) / canvas_w
        y_ratio = float(self.y_margin) / canvas_h

        if r > canvas_r:
            ycenter = (ymin + ymax) / 2.0
            newheight = height * r / canvas_r
            ymin = ycenter - newheight / 2.0
            ymax = ycenter + newheight / 2.0
        else:
            xcenter = (xmax + xmin) / 2.0
            newwidth = width * canvas_r / r
            xmin = xcenter - newwidth / 2.0
            xmax = xcenter + newwidth / 2.0

        # Adjust axes
        for ax in self.figure.get_axes():
            if ax._label != 'base':
                ax.set_frame_on(False)  # No frame
                ax.set_xticks([])  # No tick
                ax.set_yticks([])  # No ticks
                ax.patch.set_visible(False)  # No background
                ax.set_aspect(1)
            ax.set_xlim((xmin, xmax))
            ax.set_ylim((ymin, ymax))
            ax.set_position([x_ratio, y_ratio, 1 - 2 * x_ratio, 1 - 2 * y_ratio])

        # Sync re-draw to proper paint on form resize
        self.canvas.draw()

        # #### Temporary place-holder for cached update #####
        self.update_screen_request.emit([0, 0, 0, 0, 0])

    def auto_adjust_axes(self, *args):
        """
        Calls ``adjust_axes()`` using the extents of the base axes.

        :rtype : None
        :return: None
        """

        xmin, xmax = self.axes.get_xlim()
        ymin, ymax = self.axes.get_ylim()
        self.adjust_axes(xmin, ymin, xmax, ymax)

    def fit_view(self):
        self.auto_adjust_axes()

    def fit_center(self, loc, rect=None):
        x = loc[0]
        y = loc[1]

        xmin, xmax = self.axes.get_xlim()
        ymin, ymax = self.axes.get_ylim()
        half_width = (xmax - xmin) / 2
        half_height = (ymax - ymin) / 2

        # Adjust axes
        for ax in self.figure.get_axes():
            ax.set_xlim((x - half_width, x + half_width))
            ax.set_ylim((y - half_height, y + half_height))

        # Re-draw
        self.canvas.draw()

        # #### Temporary place-holder for cached update #####
        self.update_screen_request.emit([0, 0, 0, 0, 0])

    def zoom(self, factor, center=None):
        """
        Zooms the plot by factor around a given
        center point. Takes care of re-drawing.

        :param factor: Number by which to scale the plot.
        :type factor: float
        :param center: Coordinates [x, y] of the point around which to scale the plot.
        :type center: list
        :return: None
        """

        factor = 1 / factor

        xmin, xmax = self.axes.get_xlim()
        ymin, ymax = self.axes.get_ylim()

        width = xmax - xmin
        height = ymax - ymin

        if center is None or center == [None, None]:
            center = [(xmin + xmax) / 2.0, (ymin + ymax) / 2.0]

        # For keeping the point at the pointer location
        relx = (xmax - center[0]) / width
        rely = (ymax - center[1]) / height

        new_width = width / factor
        new_height = height / factor

        xmin = center[0] - new_width * (1 - relx)
        xmax = center[0] + new_width * relx
        ymin = center[1] - new_height * (1 - rely)
        ymax = center[1] + new_height * rely

        # Adjust axes
        for ax in self.figure.get_axes():
            ax.set_xlim((xmin, xmax))
            ax.set_ylim((ymin, ymax))
        # Async re-draw
        self.canvas.draw_idle()

        # #### Temporary place-holder for cached update #####
        self.update_screen_request.emit([0, 0, 0, 0, 0])

    def pan(self, x, y, idle=True):
        xmin, xmax = self.axes.get_xlim()
        ymin, ymax = self.axes.get_ylim()
        width = xmax - xmin
        height = ymax - ymin

        # Adjust axes
        for ax in self.figure.get_axes():
            ax.set_xlim((xmin + x * width, xmax + x * width))
            ax.set_ylim((ymin + y * height, ymax + y * height))

        # Re-draw
        if idle:
            self.canvas.draw_idle()
        else:
            self.canvas.draw()

        # #### Temporary place-holder for cached update #####
        self.update_screen_request.emit([0, 0, 0, 0, 0])

    def new_axes(self, name):
        """
        Creates and returns an Axes object attached to this object's Figure.

        :param name: Unique label for the axes.
        :return: Axes attached to the figure.
        :rtype: Axes
        """
        new_ax = self.figure.add_axes([0.05, 0.05, 0.9, 0.9], label=name)
        return new_ax

    def remove_current_axes(self):
        """

        :return: The name of the deleted axes
        """

        axes_to_remove = self.figure.axes.gca()
        current_axes_name = deepcopy(axes_to_remove._label)
        self.figure.axes.remove(axes_to_remove)

        return current_axes_name

    def on_scroll(self, event):
        """
        Scroll event handler.

        :param event: Event object containing the event information.
        :return: None
        """

        # So it can receive key presses
        # self.canvas.grab_focus()
        self.canvas.setFocus()

        # Event info
        # z, direction = event.get_scroll_direction()

        if self.key is None:

            if event.button == 'up':
                self.zoom(1 / 1.5, self.mouse)
            else:
                self.zoom(1.5, self.mouse)
            return

        if self.key == 'shift':

            if event.button == 'up':
                self.pan(0.3, 0)
            else:
                self.pan(-0.3, 0)
            return

        if self.key == 'control':

            if event.button == 'up':
                self.pan(0, 0.3)
            else:
                self.pan(0, -0.3)
            return

    def on_mouse_press(self, event):

        self.is_dragging = True

        # Check for middle mouse button press
        if self.app.defaults["global_pan_button"] == '2':
            pan_button = 3  # right button for Matplotlib
        else:
            pan_button = 2  # middle button for Matplotlib

        if event.button == pan_button:
            # Prepare axes for pan (using 'matplotlib' pan function)
            self.pan_axes = []
            for a in self.figure.get_axes():
                if (event.x is not None and event.y is not None and a.in_axes(event) and
                        a.get_navigate() and a.can_pan()):
                    a.start_pan(event.x, event.y, 1)
                    self.pan_axes.append(a)

            # Set pan view flag
            if len(self.pan_axes) > 0:
                self.panning = True

        if event.dblclick:
            self.double_click.emit(event)

    def on_mouse_release(self, event):

        self.is_dragging = False

        # Check for middle mouse button release to complete pan procedure
        # Check for middle mouse button press
        if self.app.defaults["global_pan_button"] == '2':
            pan_button = 3  # right button for Matplotlib
        else:
            pan_button = 2  # middle button for Matplotlib

        if event.button == pan_button:
            for a in self.pan_axes:
                a.end_pan()

            # Clear pan flag
            self.panning = False

            # And update the cursor
            if self.app.defaults["global_cursor_color_enabled"] is True:
                self.draw_cursor(x_pos=self.mouse[0], y_pos=self.mouse[1], color=self.app.cursor_color_3D)
            else:
                self.draw_cursor(x_pos=self.mouse[0], y_pos=self.mouse[1])

    def on_mouse_move(self, event):
        """
        Mouse movement event handler. Stores the coordinates. Updates view on pan.

        :param event: Contains information about the event.
        :return: None
        """

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

        self.mouse = [event.xdata, event.ydata]

        self.canvas.restore_region(self.background)

        # Update pan view on mouse move
        if self.panning is True:
            for a in self.pan_axes:
                a.drag_pan(1, event.key, event.x, event.y)

            # x_pan, y_pan = self.app.geo_editor.snap(event.xdata, event.ydata)
            # self.draw_cursor(x_pos=x_pan, y_pos=y_pan)

            # Async re-draw (redraws only on thread idle state, uses timer on backend)
            self.canvas.draw_idle()

            # #### Temporary place-holder for cached update #####
            self.update_screen_request.emit([0, 0, 0, 0, 0])

        if self.app.defaults["global_cursor_color_enabled"] is True:
            self.draw_cursor(x_pos=x, y_pos=y, color=self.app.cursor_color_3D)
        else:
            self.draw_cursor(x_pos=x, y_pos=y)
        # self.canvas.blit(self.axes.bbox)

    def translate_coords(self, position):
        """
        This does not do much. It's just for code compatibility

        :param position: Mouse event position
        :return: Tuple with mouse position
        """
        return position[0], position[1]

    def on_draw(self, renderer):

        # Store background on canvas redraw
        self.background = self.canvas.copy_from_bbox(self.axes.bbox)

    def get_axes_pixelsize(self):
        """
        Axes size in pixels.

        :return: Pixel width and height
        :rtype: tuple
        """
        bbox = self.axes.get_window_extent().transformed(self.figure.dpi_scale_trans.inverted())
        width, height = bbox.width, bbox.height
        width *= self.figure.dpi
        height *= self.figure.dpi
        return width, height

    def get_density(self):
        """
        Returns unit length per pixel on horizontal
        and vertical axes.

        :return: X and Y density
        :rtype: tuple
        """
        xpx, ypx = self.get_axes_pixelsize()

        xmin, xmax = self.axes.get_xlim()
        ymin, ymax = self.axes.get_ylim()
        width = xmax - xmin
        height = ymax - ymin

        return width / xpx, height / ypx


class FakeCursor(QtCore.QObject):
    """
    This is a fake cursor to ensure compatibility with the OpenGL engine (VisPy).
    This way I don't have to chane (disable) things related to the cursor all over when
    using the low performance Matplotlib 2D graphic engine.
    """

    mouse_state_updated = pyqtSignal(bool)

    def __init__(self):
        super().__init__()
        self._enabled = True

    @property
    def enabled(self):
        return True if self._enabled else False

    @enabled.setter
    def enabled(self, value):
        self._enabled = value
        self.mouse_state_updated.emit(value)

    def set_data(self, pos, **kwargs):
        """Internal event handler to draw the cursor when the mouse moves."""
        return


class ShapeCollectionLegacy:
    """
    This will create the axes for each collection of shapes and will also
    hold the collection of shapes into a dict self._shapes.
    This handles the shapes redraw on canvas.
    """
    def __init__(self, obj, app, name=None, annotation_job=None, linewidth=1):
        """

        :param obj:             This is the object to which the shapes collection is attached and for
        which it will have to draw shapes
        :param app:             This is the FLatCAM.App usually, needed because we have to access attributes there
        :param name:            This is the name given to the Matplotlib axes; it needs to be unique due of
        Matplotlib requurements
        :param annotation_job:  Make this True if the job needed is just for annotation
        :param linewidth:       THe width of the line (outline where is the case)
        """
        self.obj = obj
        self.app = app
        self.annotation_job = annotation_job

        self._shapes = {}
        self.shape_dict = {}
        self.shape_id = 0

        self._color = None
        self._face_color = None
        self._visible = True
        self._update = False
        self._alpha = None
        self._tool_tolerance = None
        self._tooldia = None

        self._obj = None
        self._gcode_parsed = None

        self._linewidth = linewidth

        if name is None:
            axes_name = self.obj.options['name']
        else:
            axes_name = name

        # Axes must exist and be attached to canvas.
        if axes_name not in self.app.plotcanvas.figure.axes:
            self.axes = self.app.plotcanvas.new_axes(axes_name)

    def add(self, shape=None, color=None, face_color=None, alpha=None, visible=True,
            update=False, layer=1, tolerance=0.01, obj=None, gcode_parsed=None, tool_tolerance=None, tooldia=None,
            linewidth=None):
        """
        This function will add shapes to the shape collection

        :param shape: the Shapely shape to be added to the shape collection
        :param color: edge color of the shape, hex value
        :param face_color: the body color of the shape, hex value
        :param alpha: level of transparency of the shape [0.0 ... 1.0]; Float
        :param visible: if True will allow the shapes to be added
        :param update: not used; just for compatibility with VIsPy canvas
        :param layer: just for compatibility with VIsPy canvas
        :param tolerance: just for compatibility with VIsPy canvas
        :param obj: not used
        :param gcode_parsed: not used; just for compatibility with VIsPy canvas
        :param tool_tolerance: just for compatibility with VIsPy canvas
        :param tooldia:
        :param linewidth: the width of the line
        :return:
        """
        self._color = color if color is not None else "#006E20"
        # self._face_color = face_color if face_color is not None else "#BBF268"
        self._face_color = face_color

        if linewidth is None:
            line_width = self._linewidth
        else:
            line_width = linewidth

        if len(self._color) > 7:
            self._color = self._color[:7]

        if self._face_color is not None:
            if len(self._face_color) > 7:
                self._face_color = self._face_color[:7]
                # self._alpha = int(self._face_color[-2:], 16) / 255

        self._alpha = 0.75

        if alpha is not None:
            self._alpha = alpha

        self._visible = visible
        self._update = update

        # CNCJob object related arguments
        self._obj = obj
        self._gcode_parsed = gcode_parsed
        self._tool_tolerance = tool_tolerance
        self._tooldia = tooldia

        # if self._update:
        #     self.clear()

        try:
            for sh in shape:
                self.shape_id += 1
                self.shape_dict.update({
                    'color': self._color,
                    'face_color': self._face_color,
                    'linewidth': line_width,
                    'alpha': self._alpha,
                    'shape': sh
                })

                self._shapes.update({
                    self.shape_id: deepcopy(self.shape_dict)
                })
        except TypeError:
            self.shape_id += 1
            self.shape_dict.update({
                'color': self._color,
                'face_color': self._face_color,
                'linewidth': line_width,
                'alpha': self._alpha,
                'shape': shape
            })

            self._shapes.update({
                self.shape_id: deepcopy(self.shape_dict)
            })

        return self.shape_id

    def remove(self, shape_id, update=None):
        for k in list(self._shapes.keys()):
            if shape_id == k:
                self._shapes.pop(k, None)

        if update is True:
            self.redraw()

    def clear(self, update=None):
        """
        Clear the canvas of the shapes.

        :param update:
        :return: None
        """
        self._shapes.clear()
        self.shape_id = 0

        self.axes.cla()
        try:
            self.app.plotcanvas.auto_adjust_axes()
        except Exception as e:
            log.debug("ShapeCollectionLegacy.clear() --> %s" % str(e))

        if update is True:
            self.redraw()

    def redraw(self, update_colors=None):
        """
        This draw the shapes in the shapes collection, on canvas

        :return: None
        """

        path_num = 0
        local_shapes = deepcopy(self._shapes)

        try:
            obj_type = self.obj.kind
        except AttributeError:
            obj_type = 'utility'

        if self._visible:
            # if we don't use this then when adding each new shape, the old ones will be added again, too
            if obj_type == 'utility':
                self.axes.patches.clear()

            for element in local_shapes:
                if obj_type == 'excellon':
                    # Plot excellon (All polygons?)
                    if self.obj.options["solid"] and isinstance(local_shapes[element]['shape'], Polygon):
                        try:
                            patch = PolygonPatch(local_shapes[element]['shape'],
                                                 facecolor="#C40000",
                                                 edgecolor="#750000",
                                                 alpha=local_shapes[element]['alpha'],
                                                 zorder=3,
                                                 linewidth=local_shapes[element]['linewidth']
                                                 )
                            self.axes.add_patch(patch)
                        except Exception as e:
                            log.debug("ShapeCollectionLegacy.redraw() excellon poly --> %s" % str(e))
                    else:
                        try:
                            x, y = local_shapes[element]['shape'].exterior.coords.xy
                            self.axes.plot(x, y, 'r-', linewidth=local_shapes[element]['linewidth'])
                            for ints in local_shapes[element]['shape'].interiors:
                                x, y = ints.coords.xy
                                self.axes.plot(x, y, 'o-', linewidth=local_shapes[element]['linewidth'])
                        except Exception as e:
                            log.debug("ShapeCollectionLegacy.redraw() excellon no poly --> %s" % str(e))
                elif obj_type == 'geometry':
                    if type(local_shapes[element]['shape']) == Polygon:
                        try:
                            x, y = local_shapes[element]['shape'].exterior.coords.xy
                            self.axes.plot(x, y, local_shapes[element]['color'],
                                           linestyle='-',
                                           linewidth=local_shapes[element]['linewidth'])
                            for ints in local_shapes[element]['shape'].interiors:
                                x, y = ints.coords.xy
                                self.axes.plot(x, y, local_shapes[element]['color'],
                                               linestyle='-',
                                               linewidth=local_shapes[element]['linewidth'])
                        except Exception as e:
                            log.debug("ShapeCollectionLegacy.redraw() geometry poly --> %s" % str(e))
                    elif type(local_shapes[element]['shape']) == LineString or \
                            type(local_shapes[element]['shape']) == LinearRing:

                        try:
                            x, y = local_shapes[element]['shape'].coords.xy
                            self.axes.plot(x, y, local_shapes[element]['color'],
                                           linestyle='-',
                                           linewidth=local_shapes[element]['linewidth'])
                        except Exception as e:
                            log.debug("ShapeCollectionLegacy.redraw() geometry no poly --> %s" % str(e))
                elif obj_type == 'gerber':
                    if self.obj.options["multicolored"]:
                        linespec = '-'
                    else:
                        linespec = 'k-'

                    if self.obj.options["solid"]:
                        if update_colors:
                            gerber_fill_color = update_colors[0]
                            gerber_outline_color = update_colors[1]
                        else:
                            gerber_fill_color = local_shapes[element]['face_color']
                            gerber_outline_color = local_shapes[element]['color']

                        try:
                            patch = PolygonPatch(local_shapes[element]['shape'],
                                                 facecolor=gerber_fill_color,
                                                 edgecolor=gerber_outline_color,
                                                 alpha=local_shapes[element]['alpha'],
                                                 zorder=2,
                                                 linewidth=local_shapes[element]['linewidth'])
                            self.axes.add_patch(patch)
                        except AssertionError:
                            log.warning("A geometry component was not a polygon:")
                            log.warning(str(element))
                        except Exception as e:
                            log.debug(
                                "PlotCanvasLegacy.ShepeCollectionLegacy.redraw() gerber 'solid' --> %s" % str(e))
                    else:
                        try:
                            x, y = local_shapes[element]['shape'].exterior.xy
                            self.axes.plot(x, y, linespec, linewidth=local_shapes[element]['linewidth'])
                            for ints in local_shapes[element]['shape'].interiors:
                                x, y = ints.coords.xy
                                self.axes.plot(x, y, linespec, linewidth=local_shapes[element]['linewidth'])
                        except Exception as e:
                            log.debug("ShapeCollectionLegacy.redraw() gerber no 'solid' --> %s" % str(e))
                elif obj_type == 'cncjob':

                    if local_shapes[element]['face_color'] is None:
                        try:
                            linespec = '--'
                            linecolor = local_shapes[element]['color']
                            # if geo['kind'][0] == 'C':
                            #     linespec = 'k-'
                            x, y = local_shapes[element]['shape'].coords.xy
                            self.axes.plot(x, y, linespec, color=linecolor,
                                           linewidth=local_shapes[element]['linewidth'])
                        except Exception as e:
                            log.debug("ShapeCollectionLegacy.redraw() cncjob with face_color --> %s" % str(e))
                    else:
                        try:
                            path_num += 1
                            if self.obj.ui.annotation_cb.get_value():
                                if isinstance(local_shapes[element]['shape'], Polygon):
                                    self.axes.annotate(
                                        str(path_num),
                                        xy=local_shapes[element]['shape'].exterior.coords[0],
                                        xycoords='data', fontsize=20)
                                else:
                                    self.axes.annotate(
                                        str(path_num),
                                        xy=local_shapes[element]['shape'].coords[0],
                                        xycoords='data', fontsize=20)

                            patch = PolygonPatch(local_shapes[element]['shape'],
                                                 facecolor=local_shapes[element]['face_color'],
                                                 edgecolor=local_shapes[element]['color'],
                                                 alpha=local_shapes[element]['alpha'], zorder=2,
                                                 linewidth=local_shapes[element]['linewidth'])
                            self.axes.add_patch(patch)
                        except Exception as e:
                            log.debug("ShapeCollectionLegacy.redraw() cncjob no face_color --> %s" % str(e))
                elif obj_type == 'utility':
                    # not a FlatCAM object, must be utility
                    if local_shapes[element]['face_color']:
                        try:
                            patch = PolygonPatch(local_shapes[element]['shape'],
                                                 facecolor=local_shapes[element]['face_color'],
                                                 edgecolor=local_shapes[element]['color'],
                                                 alpha=local_shapes[element]['alpha'],
                                                 zorder=2,
                                                 linewidth=local_shapes[element]['linewidth'])

                            self.axes.add_patch(patch)
                        except Exception as e:
                            log.debug("ShapeCollectionLegacy.redraw() utility poly with face_color --> %s" % str(e))
                    else:
                        if isinstance(local_shapes[element]['shape'], Polygon):
                            try:
                                ext_shape = local_shapes[element]['shape'].exterior
                                if ext_shape is not None:
                                    x, y = ext_shape.xy
                                    self.axes.plot(x, y, local_shapes[element]['color'], linestyle='-',
                                                   linewidth=local_shapes[element]['linewidth'])
                                for ints in local_shapes[element]['shape'].interiors:
                                    if ints is not None:
                                        x, y = ints.coords.xy
                                        self.axes.plot(x, y, local_shapes[element]['color'], linestyle='-',
                                                       linewidth=local_shapes[element]['linewidth'])
                            except Exception as e:
                                log.debug("ShapeCollectionLegacy.redraw() utility poly no face_color --> %s" % str(e))
                        else:
                            try:
                                if local_shapes[element]['shape'] is not None:
                                    x, y = local_shapes[element]['shape'].coords.xy
                                    self.axes.plot(x, y, local_shapes[element]['color'], linestyle='-',
                                                   linewidth=local_shapes[element]['linewidth'])
                            except Exception as e:
                                log.debug("ShapeCollectionLegacy.redraw() utility lines no face_color --> %s" % str(e))
        self.app.plotcanvas.auto_adjust_axes()

    def set(self, text, pos, visible=True, font_size=16, color=None):
        """
        This will set annotations on the canvas.

        :param text: a list of text elements to be used as annotations
        :param pos: a list of positions for showing the text elements above
        :param visible: if True will display annotations, if False will clear them on canvas
        :param font_size: the font size or the annotations
        :param color: color of the annotations
        :return: None
        """
        if color is None:
            color = "#000000FF"

        if visible is not True:
            self.clear()
            return

        if len(text) != len(pos):
            self.app.inform.emit('[ERROR_NOTCL] %s' % _("Could not annotate due of a difference between the number "
                                                        "of text elements and the number of text positions."))
            return

        for idx in range(len(text)):
            try:
                self.axes.annotate(text[idx], xy=pos[idx], xycoords='data', fontsize=font_size, color=color)
            except Exception as e:
                log.debug("ShapeCollectionLegacy.set() --> %s" % str(e))

        self.app.plotcanvas.auto_adjust_axes()

    @property
    def visible(self):
        return self._visible

    @visible.setter
    def visible(self, value):
        if value is False:
            self.axes.cla()
            self.app.plotcanvas.auto_adjust_axes()
        else:
            if self._visible is False:
                self.redraw()
        self._visible = value

    @property
    def enabled(self):
        return self._visible

    @enabled.setter
    def enabled(self, value):
        if value is False:
            self.axes.cla()
            self.app.plotcanvas.auto_adjust_axes()
        else:
            if self._visible is False:
                self.redraw()
        self._visible = value

# class MplCursor(Cursor):
#     """
#     Unfortunately this gets attached to the current axes and if a new axes is added
#     it will not be showed until that axes is deleted.
#     Not the kind of behavior needed here so I don't use it anymore.
#     """
#     def __init__(self, axes, color='red', linewidth=1):
#
#         super().__init__(ax=axes, useblit=True, color=color, linewidth=linewidth)
#         self._enabled = True
#
#         self.axes = axes
#         self.color = color
#         self.linewidth = linewidth
#
#         self.x = None
#         self.y = None
#
#     @property
#     def enabled(self):
#         return True if self._enabled else False
#
#     @enabled.setter
#     def enabled(self, value):
#         self._enabled = value
#         self.visible = self._enabled
#         self.canvas.draw()
#
#     def onmove(self, event):
#         pass
#
#     def set_data(self, event, pos):
#         """Internal event handler to draw the cursor when the mouse moves."""
#         self.x = pos[0]
#         self.y = pos[1]
#
#         if self.ignore(event):
#             return
#         if not self.canvas.widgetlock.available(self):
#             return
#         if event.inaxes != self.ax:
#             self.linev.set_visible(False)
#             self.lineh.set_visible(False)
#
#             if self.needclear:
#                 self.canvas.draw()
#                 self.needclear = False
#             return
#         self.needclear = True
#         if not self.visible:
#             return
#         self.linev.set_xdata((self.x, self.x))
#
#         self.lineh.set_ydata((self.y, self.y))
#         self.linev.set_visible(self.visible and self.vertOn)
#         self.lineh.set_visible(self.visible and self.horizOn)
#
#         self._update()