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#!/usr/bin/env python

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# -*- coding: utf-8 -*-

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#This file is part of PLCOpenEditor, a library implementing an IEC 61131-3 editor

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#based on the plcopen standard. 

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#

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#Copyright (C) 2007: Edouard TISSERANT and Laurent BESSARD

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#

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#See COPYING file for copyrights details.

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#

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#This library is free software; you can redistribute it and/or

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#modify it under the terms of the GNU General Public

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#License as published by the Free Software Foundation; either

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#version 2.1 of the License, or (at your option) any later version.

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#

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#This library is distributed in the hope that it will be useful,

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#but WITHOUT ANY WARRANTY; without even the implied warranty of

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#MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

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#General Public License for more details.

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#

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#You should have received a copy of the GNU General Public

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#License along with this library; if not, write to the Free Software

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#Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

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import wx

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import wx.lib.plot as plot

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import numpy

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import math

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from graphics.GraphicCommons import DebugViewer, MODE_SELECTION, MODE_MOTION

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from controls import EditorPanel

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colours = ['blue', 'red', 'green', 'yellow', 'orange', 'purple', 'brown', 'cyan',

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           'pink', 'grey']

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markers = ['circle', 'dot', 'square', 'triangle', 'triangle_down', 'cross', 'plus', 'circle']

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    36

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#-------------------------------------------------------------------------------

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#                       Debug Variable Graphic Viewer class

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#-------------------------------------------------------------------------------

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    41

SECOND = 1000000000

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MINUTE = 60 * SECOND

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HOUR = 60 * MINUTE

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    45

ZOOM_VALUES = map(lambda x:("x %.1f" % x, x), [math.sqrt(2) ** i for i in xrange(8)])

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RANGE_VALUES = map(lambda x: (str(x), x), [25 * 2 ** i for i in xrange(6)])

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TIME_RANGE_VALUES = [("%ds" % i, i * SECOND) for i in (1, 2, 5, 10, 20, 30)] + \

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                    [("%dm" % i, i * MINUTE) for i in (1, 2, 5, 10, 20, 30)] + \

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                    [("%dh" % i, i * HOUR) for i in (1, 2, 3, 6, 12, 24)]

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    51

[ID_GRAPHICVIEWER, ID_GRAPHICVIEWERCANVAS, 

    52

 ID_GRAPHICVIEWERCANVASRANGE, ID_GRAPHICVIEWERCANVASZOOM, 

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 ID_GRAPHICVIEWERCANVASPOSITION, ID_GRAPHICVIEWERRESETBUTTON, 

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 ID_GRAPHICVIEWERCURRENTBUTTON, ID_GRAPHICVIEWERSTATICTEXT1, 

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 ID_GRAPHICVIEWERSTATICTEXT2, ID_GRAPHICVIEWERSTATICTEXT3, 

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] = [wx.NewId() for _init_ctrls in range(10)]

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class GraphicViewer(EditorPanel, DebugViewer):

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    60

    def _init_coll_MainGridSizer_Items(self, parent):

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        # generated method, don't edit

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        parent.AddWindow(self.Canvas, 0, border=0, flag=wx.GROW)

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        parent.AddSizer(self.RangeSizer, 0, border=0, flag=wx.GROW)

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    def _init_coll_MainGridSizer_Growables(self, parent):

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        # generated method, don't edit

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        parent.AddGrowableCol(0)

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        parent.AddGrowableRow(0)

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    def _init_coll_RangeSizer_Items(self, parent):

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        # generated method, don't edit

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        parent.AddWindow(self.staticbox1, 0, border=5, flag=wx.ALIGN_CENTER_VERTICAL|wx.ALL)

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        parent.AddWindow(self.CanvasRange, 0, border=5, flag=wx.ALL)

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        parent.AddWindow(self.staticbox3, 0, border=5, flag=wx.ALIGN_CENTER_VERTICAL|wx.ALL)

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        parent.AddWindow(self.CanvasZoom, 0, border=5, flag=wx.ALL)

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        parent.AddWindow(self.staticText2, 0, border=5, flag=wx.ALIGN_CENTER_VERTICAL|wx.ALL)

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        parent.AddWindow(self.CanvasPosition, 0, border=5, flag=wx.GROW|wx.ALL)

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        parent.AddWindow(self.ResetButton, 0, border=5, flag=wx.ALL)

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        parent.AddWindow(self.CurrentButton, 0, border=5, flag=wx.ALL)

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    def _init_coll_RangeSizer_Growables(self, parent):

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        # generated method, don't edit

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        parent.AddGrowableCol(3)

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        parent.AddGrowableRow(0)

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    def _init_sizers(self):

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        # generated method, don't edit

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        self.MainGridSizer = wx.FlexGridSizer(cols=1, hgap=0, rows=2, vgap=0)

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        self.RangeSizer = wx.FlexGridSizer(cols=8, hgap=0, rows=1, vgap=0)

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        self._init_coll_MainGridSizer_Items(self.MainGridSizer)

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        self._init_coll_MainGridSizer_Growables(self.MainGridSizer)

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        self._init_coll_RangeSizer_Items(self.RangeSizer)

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        self._init_coll_RangeSizer_Growables(self.RangeSizer)

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        self.Editor.SetSizer(self.MainGridSizer)

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    def _init_Editor(self, prnt):

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        self.Editor = wx.Panel(prnt, ID_GRAPHICVIEWER, wx.DefaultPosition, 

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                 wx.DefaultSize, 0)

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        self.Canvas = plot.PlotCanvas(id=ID_GRAPHICVIEWERCANVAS, 

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              name='Canvas', parent=self.Editor, pos=wx.Point(0, 0),

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              size=wx.Size(0, 0), style=0)

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        def _axisInterval(spec, lower, upper):

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            if spec == 'border':

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                if lower == upper:

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                    return lower - 0.5, upper + 0.5

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                else:

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                    border = (upper - lower) * 0.05

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                    return lower - border, upper + border

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            else:

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                return plot.PlotCanvas._axisInterval(self.Canvas, spec, lower, upper)

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        self.Canvas._axisInterval = _axisInterval

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        self.Canvas.SetYSpec('border')

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        self.Canvas.canvas.Bind(wx.EVT_LEFT_DOWN, self.OnCanvasLeftDown)

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        self.Canvas.canvas.Bind(wx.EVT_LEFT_UP, self.OnCanvasLeftUp)

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        self.Canvas.canvas.Bind(wx.EVT_MOTION, self.OnCanvasMotion)

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        self.Canvas.canvas.Bind(wx.EVT_MOUSEWHEEL, self.OnCanvasMouseWheel)

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        self.staticbox1 = wx.StaticText(id=ID_GRAPHICVIEWERSTATICTEXT1,

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              label=_('Range:'), name='staticText1', parent=self.Editor,

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              pos=wx.Point(0, 0), size=wx.DefaultSize, style=0)

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        self.CanvasRange = wx.ComboBox(id=ID_GRAPHICVIEWERCANVASRANGE,

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              name='CanvasRange', parent=self.Editor, pos=wx.Point(0, 0),

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              size=wx.Size(100, 28), style=wx.CB_READONLY)

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        self.Bind(wx.EVT_COMBOBOX, self.OnRangeChanged, id=ID_GRAPHICVIEWERCANVASRANGE)

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        self.staticbox3 = wx.StaticText(id=ID_GRAPHICVIEWERSTATICTEXT3,

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              label=_('Zoom:'), name='staticText3', parent=self.Editor,

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              pos=wx.Point(0, 0), size=wx.DefaultSize, style=0)

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        self.CanvasZoom = wx.ComboBox(id=ID_GRAPHICVIEWERCANVASZOOM,

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              name='CanvasZoom', parent=self.Editor, pos=wx.Point(0, 0),

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              size=wx.Size(70, 28), style=wx.CB_READONLY)

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        self.Bind(wx.EVT_COMBOBOX, self.OnZoomChanged, id=ID_GRAPHICVIEWERCANVASZOOM)

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        self.staticText2 = wx.StaticText(id=ID_GRAPHICVIEWERSTATICTEXT2,

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              label=_('Position:'), name='staticText2', parent=self.Editor,

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              pos=wx.Point(0, 0), size=wx.DefaultSize, style=0)

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        self.CanvasPosition = wx.ScrollBar(id=ID_GRAPHICVIEWERCANVASPOSITION,

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              name='Position', parent=self.Editor, pos=wx.Point(0, 0),

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              size=wx.Size(0, 16), style=wx.SB_HORIZONTAL)

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        self.CanvasPosition.SetScrollbar(0, 10, 100, 10)

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        self.CanvasPosition.Bind(wx.EVT_SCROLL_THUMBTRACK, self.OnPositionChanging, 

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              id = ID_GRAPHICVIEWERCANVASPOSITION)

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        self.CanvasPosition.Bind(wx.EVT_SCROLL_LINEUP, self.OnPositionChanging, 

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              id = ID_GRAPHICVIEWERCANVASPOSITION)

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        self.CanvasPosition.Bind(wx.EVT_SCROLL_LINEDOWN, self.OnPositionChanging, 

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              id = ID_GRAPHICVIEWERCANVASPOSITION)

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        self.CanvasPosition.Bind(wx.EVT_SCROLL_PAGEUP, self.OnPositionChanging, 

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              id = ID_GRAPHICVIEWERCANVASPOSITION)

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        self.CanvasPosition.Bind(wx.EVT_SCROLL_PAGEDOWN, self.OnPositionChanging, 

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              id = ID_GRAPHICVIEWERCANVASPOSITION)

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        self.ResetButton = wx.Button(id=ID_GRAPHICVIEWERRESETBUTTON, label='Reset',

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              name='ResetButton', parent=self.Editor, pos=wx.Point(0, 0),

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              size=wx.Size(72, 24), style=0)

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        self.Bind(wx.EVT_BUTTON, self.OnResetButton, id=ID_GRAPHICVIEWERRESETBUTTON)

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        self.CurrentButton = wx.Button(id=ID_GRAPHICVIEWERCURRENTBUTTON, label='Current',

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              name='CurrentButton', parent=self.Editor, pos=wx.Point(0, 0),

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              size=wx.Size(72, 24), style=0)

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        self.Bind(wx.EVT_BUTTON, self.OnCurrentButton, id=ID_GRAPHICVIEWERCURRENTBUTTON)

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   168

        self._init_sizers()

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   170

    def __init__(self, parent, window, producer, instancepath = ""):

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        EditorPanel.__init__(self, parent, "", window, None)

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        DebugViewer.__init__(self, producer, True, False)

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        self.InstancePath = instancepath

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        self.RangeValues = None

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        self.CursorIdx = None

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        self.LastCursor = None

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        self.CurrentMousePos = None

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        self.CurrentMotionValue = None

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        self.Dragging = False

   181

   182

        # Initialize Viewer mode to Selection mode

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        self.Mode = MODE_SELECTION

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   185

        self.Datas = []

   186

        self.StartTick = 0

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        self.EndTick = 0

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        self.StartIdx = 0

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        self.EndIdx = 0

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        self.MinValue = None

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        self.MaxValue = None

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        self.YCenter = 0

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        self.CurrentZoom = 1

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        self.Fixed = False

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        self.Ticktime = self.DataProducer.GetTicktime()

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        self.RefreshCanvasRange()

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   198

        for zoom_txt, zoom in ZOOM_VALUES:

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            self.CanvasZoom.Append(zoom_txt)

   200

        self.CanvasZoom.SetSelection(0)

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        self.AddDataConsumer(self.InstancePath.upper(), self)

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   204

    def __del__(self):

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        DebugViewer.__del__(self)

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        self.RemoveDataConsumer(self)

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   208

    def GetTitle(self):

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        if len(self.InstancePath) > 15:

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            return "..." + self.InstancePath[-12:]

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        return self.InstancePath

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   213

    # Changes Viewer mode

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    def SetMode(self, mode):

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        if self.Mode != mode or mode == MODE_SELECTION:    

   216

            if self.Mode == MODE_MOTION:

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                wx.CallAfter(self.Canvas.canvas.SetCursor, wx.NullCursor)

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            self.Mode = mode

   219

        if self.Mode == MODE_MOTION:

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            wx.CallAfter(self.Canvas.canvas.SetCursor, wx.StockCursor(wx.CURSOR_HAND))

   221

   222

    def ResetView(self, register=False):

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        self.Datas = []

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        self.StartTick = 0

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        self.EndTick = 0

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        self.StartIdx = 0

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        self.EndIdx = 0

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        self.Fixed = False

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        self.Ticktime = self.DataProducer.GetTicktime()

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        if register:

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            self.AddDataConsumer(self.InstancePath.upper(), self)

   232

        self.RefreshCanvasRange()

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        self.RefreshView()

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   235

    def RefreshNewData(self, *args, **kwargs):

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        self.RefreshView(*args, **kwargs)

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        DebugViewer.RefreshNewData(self)

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   239

    def GetNearestData(self, tick, adjust):

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        ticks = numpy.array(zip(*self.Datas)[0])

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        new_cursor = numpy.argmin(abs(ticks - tick))

   242

        if adjust == -1 and ticks[new_cursor] > tick and new_cursor > 0:

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            new_cursor -= 1

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        elif adjust == 1 and ticks[new_cursor] < tick and new_cursor < len(self.Datas):

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            new_cursor += 1

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        return new_cursor

   247

   248

    def GetBounds(self):

   249

        if self.StartIdx is None or self.EndIdx is None:

   250

            self.StartIdx = self.GetNearestData(self.StartTick, -1)

   251

            self.EndIdx = self.GetNearestData(self.EndTick, 1)

   252

   253

    def ResetBounds(self):

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        self.StartIdx = None

   255

        self.EndIdx = None

   256

   257

    def RefreshCanvasRange(self):

   258

        if self.Ticktime == 0 and self.RangeValues != RANGE_VALUES:

   259

            self.RangeValues = RANGE_VALUES

   260

            self.CanvasRange.Clear()

   261

            for text, value in RANGE_VALUES:

   262

                self.CanvasRange.Append(text)

   263

            self.CanvasRange.SetStringSelection(RANGE_VALUES[0][0])

   264

            self.CurrentRange = RANGE_VALUES[0][1]

   265

        elif self.RangeValues != TIME_RANGE_VALUES:

   266

            self.RangeValues = TIME_RANGE_VALUES

   267

            self.CanvasRange.Clear()

   268

            for text, value in TIME_RANGE_VALUES:

   269

                self.CanvasRange.Append(text)

   270

            self.CanvasRange.SetStringSelection(TIME_RANGE_VALUES[0][0])

   271

            self.CurrentRange = TIME_RANGE_VALUES[0][1] / self.Ticktime

   272

   273

    def RefreshView(self, force=True):

   274

        self.Freeze()

   275

        if force or not self.Fixed:

   276

            if (self.MinValue is not None and 

   277

                self.MaxValue is not None and 

   278

                self.MinValue != self.MaxValue):

   279

                Yrange = float(self.MaxValue - self.MinValue) / self.CurrentZoom

   280

            else:

   281

                Yrange = 2. / self.CurrentZoom

   282

   283

            if not self.Fixed and len(self.Datas) > 0:

   284

                self.YCenter = max(self.Datas[-1][1] - Yrange / 2, 

   285

                               min(self.YCenter, 

   286

                                   self.Datas[-1][1] + Yrange / 2))

   287

   288

            var_name = self.InstancePath.split(".")[-1]

   289

   290

            self.GetBounds()

   291

            self.VariableGraphic = plot.PolyLine(self.Datas[self.StartIdx:self.EndIdx + 1], 

   292

                                                 legend=var_name, colour=colours[0])

   293

            self.GraphicsObject = plot.PlotGraphics([self.VariableGraphic], _("%s Graphics") % var_name, _("Tick"), _("Values"))

   294

            datas_length = len(self.Datas)

   295

            if datas_length > 1:

   296

                start = self.Datas[self.StartIdx][0]

   297

            else:

   298

                start = 0.

   299

            self.Canvas.Draw(self.GraphicsObject, 

   300

                             xAxis=(start, start + self.CurrentRange),

   301

                             yAxis=(self.YCenter - Yrange * 1.1 / 2, self.YCenter + Yrange * 1.1 / 2))

   302

        self.RefreshScrollBar()

   303

   304

        # Reset and draw cursor 

   305

        self.ResetLastCursor()

   306

        self.RefreshCursor()

   307

   308

        self.Thaw()

   309

   310

    def GetInstancePath(self):

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        return self.InstancePath

   312

   313

    def IsViewing(self, tagname):

   314

        return self.InstancePath == tagname

   315

   316

    def NewValue(self, tick, value, forced=False):

   317

        self.Datas.append((float(tick), {True:1., False:0.}.get(value, float(value))))

   318

        if self.MinValue is None:

   319

            self.MinValue = value

   320

        else:

   321

            self.MinValue = min(self.MinValue, value)

   322

        if self.MaxValue is None:

   323

            self.MaxValue = value

   324

        else:

   325

            self.MaxValue = max(self.MaxValue, value)

   326

        if not self.Fixed:

   327

            self.GetBounds()

   328

            while int(self.Datas[self.StartIdx][0]) < tick - self.CurrentRange:

   329

                self.StartIdx += 1

   330

            self.EndIdx += 1

   331

            self.StartTick = self.Datas[self.StartIdx][0]

   332

            self.EndTick = self.StartTick + self.CurrentRange

   333

        self.NewDataAvailable()

   334

   335

    def RefreshScrollBar(self):

   336

        if len(self.Datas) > 0:

   337

            self.GetBounds()

   338

            pos = int(self.Datas[self.StartIdx][0] - self.Datas[0][0])

   339

            range = int(self.Datas[-1][0] - self.Datas[0][0])

   340

        else:

   341

            pos = 0

   342

            range = 0

   343

        self.CanvasPosition.SetScrollbar(pos, self.CurrentRange, range, self.CurrentRange)

   344

   345

    def RefreshRange(self):

   346

        if len(self.Datas) > 0:

   347

            if self.Fixed and self.Datas[-1][0] - self.Datas[0][0] < self.CurrentRange:

   348

                self.Fixed = False

   349

            self.ResetBounds()

   350

            if self.Fixed:

   351

                self.StartTick = min(self.StartTick, self.Datas[-1][0] - self.CurrentRange)

   352

            else:

   353

                self.StartTick = max(self.Datas[0][0], self.EndTick - self.CurrentRange - 1)

   354

            self.EndTick = self.StartTick + self.CurrentRange

   355

        self.NewDataAvailable(True)

   356

   357

    def OnRangeChanged(self, event):

   358

        try:

   359

            if self.Ticktime == 0:

   360

                self.CurrentRange = self.RangeValues[self.CanvasRange.GetSelection()][1]

   361

            else:

   362

                self.CurrentRange = self.RangeValues[self.CanvasRange.GetSelection()][1] / self.Ticktime

   363

        except ValueError, e:

   364

            self.CanvasRange.SetValue(str(self.CurrentRange))

   365

        wx.CallAfter(self.RefreshRange)

   366

        event.Skip()

   367

   368

    def OnZoomChanged(self, event):

   369

        self.CurrentZoom = ZOOM_VALUES[self.CanvasZoom.GetSelection()][1]

   370

        wx.CallAfter(self.NewDataAvailable, True)

   371

        event.Skip()

   372

   373

    def OnPositionChanging(self, event):

   374

        self.ResetBounds()

   375

        self.StartTick = self.Datas[0][0] + event.GetPosition()

   376

        self.EndTick = self.StartTick + self.CurrentRange

   377

        self.Fixed = True

   378

        self.NewDataAvailable(True)

   379

        event.Skip()

   380

   381

    def OnResetButton(self, event):

   382

        self.Fixed = False

   383

        self.ResetView()

   384

        event.Skip()

   385

   386

    def OnCurrentButton(self, event):

   387

        self.ResetBounds()

   388

        self.StartTick = max(self.Datas[0][0], self.Datas[-1][0] - self.CurrentRange)

   389

        self.EndTick = self.StartTick + self.CurrentRange

   390

        self.Fixed = False

   391

        self.NewDataAvailable(True)

   392

        event.Skip()

   393

   394

    def OnCanvasLeftDown(self, event):

   395

        self.Fixed = True

   396

        self.Canvas.canvas.CaptureMouse()

   397

        if self.Mode == MODE_SELECTION:

   398

            self.Dragging = True

   399

            pos = self.Canvas.PositionScreenToUser(event.GetPosition())

   400

            self.CursorIdx = self.GetNearestData(pos[0], -1)

   401

            self.RefreshCursor()

   402

        elif self.Mode == MODE_MOTION:

   403

            self.GetBounds()

   404

            self.CurrentMousePos = event.GetPosition()

   405

            self.CurrentMotionValue = self.Datas[self.StartIdx][0]

   406

        event.Skip()

   407

   408

    def OnCanvasLeftUp(self, event):

   409

        self.Dragging = False

   410

        if self.Mode == MODE_MOTION:

   411

            self.CurrentMousePos = None

   412

            self.CurrentMotionValue = None

   413

        if self.Canvas.canvas.HasCapture():

   414

            self.Canvas.canvas.ReleaseMouse()

   415

        event.Skip()

   416

   417

    def OnCanvasMotion(self, event):

   418

        if self.Mode == MODE_SELECTION and self.Dragging:

   419

            pos = self.Canvas.PositionScreenToUser(event.GetPosition())

   420

            graphics, xAxis, yAxis = self.Canvas.last_draw

   421

            self.CursorIdx = self.GetNearestData(max(xAxis[0], min(pos[0], xAxis[1])), -1)

   422

            self.RefreshCursor()

   423

        elif self.CurrentMousePos is not None:

   424

            oldpos = self.Canvas.PositionScreenToUser(self.CurrentMousePos)

   425

            newpos = self.Canvas.PositionScreenToUser(event.GetPosition())

   426

            self.CurrentMotionValue += oldpos[0] - newpos[0]

   427

            self.YCenter += oldpos[1] - newpos[1]

   428

            self.ResetBounds()

   429

            self.StartTick = self.CurrentMotionValue

   430

            self.EndTick = self.StartTick + self.CurrentRange

   431

            self.CurrentMousePos = event.GetPosition()

   432

            self.NewDataAvailable(True)

   433

        event.Skip()

   434

   435

    def OnCanvasMouseWheel(self, event):

   436

        if self.CurrentMousePos is None:

   437

            rotation = event.GetWheelRotation() / event.GetWheelDelta()

   438

            if event.ShiftDown():

   439

                current = self.CanvasRange.GetSelection()

   440

                new = max(0, min(current - rotation, len(self.RangeValues) - 1))

   441

                if new != current:

   442

                    if self.Ticktime == 0:

   443

                        self.CurrentRange = self.RangeValues[new][1]

   444

                    else:

   445

                        self.CurrentRange = self.RangeValues[new][1] / self.Ticktime

   446

                    self.CanvasRange.SetStringSelection(self.RangeValues[new][0])

   447

                    wx.CallAfter(self.RefreshRange)

   448

            else:

   449

                current = self.CanvasZoom.GetSelection()

   450

                new = max(0, min(current - rotation, len(ZOOM_VALUES) - 1))

   451

                if new != current:

   452

                    self.CurrentZoom = ZOOM_VALUES[new][1]

   453

                    self.CanvasZoom.SetStringSelection(ZOOM_VALUES[new][0])

   454

                    wx.CallAfter(self.NewDataAvailable, True)

   455

        event.Skip()

   456

   457

    ## Reset the last cursor

   458

    def ResetLastCursor(self):

   459

        self.LastCursor = None

   460

   461

    ## Draw the cursor on graphic

   462

    #  @param dc The draw canvas

   463

    #  @param cursor The cursor parameters

   464

    def DrawCursor(self, dc, cursor, value):

   465

        if self.StartTick <= cursor <= self.EndTick:

   466

            # Prepare temporary dc for drawing

   467

            width = self.Canvas._Buffer.GetWidth()

   468

            height = self.Canvas._Buffer.GetHeight()

   469

            tmp_Buffer = wx.EmptyBitmap(width, height)

   470

            dcs = wx.MemoryDC()

   471

            dcs.SelectObject(tmp_Buffer)

   472

            dcs.Clear()

   473

            dcs.BeginDrawing()

   474

   475

            dcs.SetPen(wx.Pen(wx.RED))

   476

            dcs.SetBrush(wx.Brush(wx.RED, wx.SOLID))

   477

            dcs.SetFont(self.Canvas._getFont(self.Canvas._fontSizeAxis))

   478

   479

            # Calculate clipping region

   480

            graphics, xAxis, yAxis = self.Canvas.last_draw

   481

            p1 = numpy.array([xAxis[0], yAxis[0]])

   482

            p2 = numpy.array([xAxis[1], yAxis[1]])

   483

            cx, cy, cwidth, cheight = self.Canvas._point2ClientCoord(p1, p2)

   484

   485

            px, py = self.Canvas.PositionUserToScreen((float(cursor), 0.))

   486

   487

            # Draw line cross drawing for diaplaying time cursor

   488

            dcs.DrawLine(px, cy + 1, px, cy + cheight - 1)

   489

   490

            text = "X:%d\nY:%f"%(cursor, value)

   491

            w, h = dcs.GetTextExtent(text)

   492

            # Draw time cursor date

   493

            dcs.DrawText(text, min(px + 3, cx + cwidth - w), cy + 3)

   494

   495

            dcs.EndDrawing()

   496

   497

            #this will erase if called twice

   498

            dc.Blit(0, 0, width, height, dcs, 0, 0, wx.EQUIV)  #(NOT src) XOR dst