1 #!/usr/bin/env python

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

     3 

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

     5 #based on the plcopen standard. 

     6 #

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

     8 #

     9 #See COPYING file for copyrights details.

    10 #

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

    12 #modify it under the terms of the GNU General Public

    13 #License as published by the Free Software Foundation; either

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

    15 #

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

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

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

    19 #General Public License for more details.

    20 #

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

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

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

    24 

    25 import numpy

    26 import math

    27 

    28 import wx

    29 import wx.lib.plot as plot

    30 import wx.lib.buttons

    31 

    32 from graphics.GraphicCommons import MODE_SELECTION, MODE_MOTION

    33 from editors.DebugViewer import DebugViewer

    34 from editors.EditorPanel import EditorPanel

    35 from util.BitmapLibrary import GetBitmap

    36 

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

    38            'pink', 'grey']

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

    40 

    41 

    42 #-------------------------------------------------------------------------------

    43 #                       Debug Variable Graphic Viewer class

    44 #-------------------------------------------------------------------------------

    45 

    46 SECOND = 1000000000

    47 MINUTE = 60 * SECOND

    48 HOUR = 60 * MINUTE

    49 

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

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

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

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

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

    55 

    56 class GraphicViewer(EditorPanel, DebugViewer):

    57 

    58     def _init_Editor(self, prnt):

    59         self.Editor = wx.Panel(prnt)

    60         

    61         main_sizer = wx.FlexGridSizer(cols=1, hgap=0, rows=2, vgap=0)

    62         main_sizer.AddGrowableCol(0)

    63         main_sizer.AddGrowableRow(0)

    64         

    65         self.Canvas = plot.PlotCanvas(self.Editor, name='Canvas')

    66         def _axisInterval(spec, lower, upper):

    67             if spec == 'border':

    68                 if lower == upper:

    69                     return lower - 0.5, upper + 0.5

    70                 else:

    71                     border = (upper - lower) * 0.05

    72                     return lower - border, upper + border

    73             else:

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

    75         self.Canvas._axisInterval = _axisInterval

    76         self.Canvas.SetYSpec('border')

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

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

    79         self.Canvas.canvas.Bind(wx.EVT_MIDDLE_DOWN, self.OnCanvasMiddleDown)

    80         self.Canvas.canvas.Bind(wx.EVT_MIDDLE_UP, self.OnCanvasMiddleUp)

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

    82         self.Canvas.canvas.Bind(wx.EVT_SIZE, self.OnCanvasResize)

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

    84         

    85         range_sizer = wx.FlexGridSizer(cols=10, hgap=5, rows=1, vgap=0)

    86         range_sizer.AddGrowableCol(5)

    87         range_sizer.AddGrowableRow(0)

    88         main_sizer.AddSizer(range_sizer, 0, border=5, flag=wx.GROW|wx.ALL)

    89         

    90         range_label = wx.StaticText(self.Editor, label=_('Range:'))

    91         range_sizer.AddWindow(range_label, 0, border=0, flag=wx.ALIGN_CENTER_VERTICAL)

    92         

    93         self.CanvasRange = wx.ComboBox(self.Editor, 

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

    95         self.Bind(wx.EVT_COMBOBOX, self.OnRangeChanged, self.CanvasRange)

    96         range_sizer.AddWindow(self.CanvasRange, 0, border=0, flag=wx.ALIGN_CENTER_VERTICAL)

    97         

    98         zoom_label = wx.StaticText(self.Editor, label=_('Zoom:'))

    99         range_sizer.AddWindow(zoom_label, 0, border=0, flag=wx.ALIGN_CENTER_VERTICAL)

   100         

   101         self.CanvasZoom = wx.ComboBox(self.Editor, 

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

   103         self.Bind(wx.EVT_COMBOBOX, self.OnZoomChanged, self.CanvasZoom)

   104         range_sizer.AddWindow(self.CanvasZoom, 0, border=0, flag=wx.ALIGN_CENTER_VERTICAL)

   105         

   106         position_label = wx.StaticText(self.Editor, label=_('Position:'))

   107         range_sizer.AddWindow(position_label, 0, border=0, flag=wx.ALIGN_CENTER_VERTICAL)

   108         

   109         self.CanvasPosition = wx.ScrollBar(self.Editor, 

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

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

   112         self.CanvasPosition.Bind(wx.EVT_SCROLL_THUMBTRACK, 

   113               self.OnPositionChanging, self.CanvasPosition)

   114         self.CanvasPosition.Bind(wx.EVT_SCROLL_LINEUP, 

   115               self.OnPositionChanging, self.CanvasPosition)

   116         self.CanvasPosition.Bind(wx.EVT_SCROLL_LINEDOWN, 

   117               self.OnPositionChanging, self.CanvasPosition)

   118         self.CanvasPosition.Bind(wx.EVT_SCROLL_PAGEUP, 

   119               self.OnPositionChanging, self.CanvasPosition)

   120         self.CanvasPosition.Bind(wx.EVT_SCROLL_PAGEDOWN, 

   121               self.OnPositionChanging, self.CanvasPosition)

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

   123         

   124         self.ResetButton = wx.lib.buttons.GenBitmapButton(self.Editor, 

   125               bitmap=GetBitmap("reset"), size=wx.Size(28, 28), style=wx.NO_BORDER)

   126         self.ResetButton.SetToolTipString(_("Clear the graph values"))

   127         self.Bind(wx.EVT_BUTTON, self.OnResetButton, self.ResetButton)

   128         range_sizer.AddWindow(self.ResetButton, 0, border=0, flag=0)

   129         

   130         self.CurrentButton = wx.lib.buttons.GenBitmapButton(self.Editor, 

   131               bitmap=GetBitmap("current"), size=wx.Size(28, 28), style=wx.NO_BORDER)

   132         self.CurrentButton.SetToolTipString(_("Go to current value"))

   133         self.Bind(wx.EVT_BUTTON, self.OnCurrentButton, self.CurrentButton)

   134         range_sizer.AddWindow(self.CurrentButton, 0, border=0, flag=0)

   135         

   136         self.ResetZoomOffsetButton = wx.lib.buttons.GenBitmapButton(self.Editor, 

   137               bitmap=GetBitmap("fit"), size=wx.Size(28, 28), style=wx.NO_BORDER)

   138         self.ResetZoomOffsetButton.SetToolTipString(_("Reset zoom and offset"))

   139         self.Bind(wx.EVT_BUTTON, self.OnResetZoomOffsetButton, 

   140               self.ResetZoomOffsetButton)

   141         range_sizer.AddWindow(self.ResetZoomOffsetButton, 0, border=0, flag=0)

   142         

   143         self.ExportGraphButton = wx.lib.buttons.GenBitmapButton(self.Editor, 

   144               bitmap=GetBitmap("export_graph"), size=wx.Size(28, 28), style=wx.NO_BORDER)

   145         self.ExportGraphButton.SetToolTipString(_("Export graph values to clipboard"))

   146         self.Bind(wx.EVT_BUTTON, self.OnExportGraphButtonClick, 

   147                 self.ExportGraphButton)

   148         range_sizer.AddWindow(self.ExportGraphButton, 0, border=0, flag=0)

   149         

   150         self.Editor.SetSizer(main_sizer)

   151 

   152         self.Editor.Bind(wx.EVT_MOUSEWHEEL, self.OnCanvasMouseWheel)

   153 

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

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

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

   157         

   158         self.InstancePath = instancepath

   159         self.RangeValues = None

   160         self.CursorIdx = None

   161         self.LastCursor = None

   162         self.CurrentMousePos = None

   163         self.CurrentMotionValue = None

   164         self.Dragging = False

   165         

   166         # Initialize Viewer mode to Selection mode

   167         self.Mode = MODE_SELECTION

   168         

   169         self.Data = numpy.array([]).reshape(0, 2)

   170         self.StartTick = 0

   171         self.StartIdx = 0

   172         self.EndIdx = 0

   173         self.MinValue = None

   174         self.MaxValue = None

   175         self.YCenter = 0

   176         self.CurrentZoom = 1.0

   177         self.Fixed = False

   178         self.Ticktime = self.DataProducer.GetTicktime()

   179         self.RefreshCanvasRange()

   180         

   181         for zoom_txt, zoom in ZOOM_VALUES:

   182             self.CanvasZoom.Append(zoom_txt)

   183         self.CanvasZoom.SetSelection(0)

   184         

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

   186     

   187     def __del__(self):

   188         DebugViewer.__del__(self)

   189         self.RemoveDataConsumer(self)

   190     

   191     def GetTitle(self):

   192         if len(self.InstancePath) > 15:

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

   194         return self.InstancePath

   195     

   196     # Changes Viewer mode

   197     def SetMode(self, mode):

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

   199             if self.Mode == MODE_MOTION:

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

   201             self.Mode = mode

   202         if self.Mode == MODE_MOTION:

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

   204         

   205     def ResetView(self, register=False):

   206         self.Data = numpy.array([]).reshape(0, 2)

   207         self.StartTick = 0

   208         self.StartIdx = 0

   209         self.EndIdx = 0

   210         self.MinValue = None

   211         self.MaxValue = None

   212         self.CursorIdx = None

   213         self.Fixed = False

   214         self.Ticktime = self.DataProducer.GetTicktime()

   215         if register:

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

   217         self.ResetLastCursor()

   218         self.RefreshCanvasRange()

   219         self.RefreshView()

   220     

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

   222         self.RefreshView(*args, **kwargs)

   223         DebugViewer.RefreshNewData(self)

   224     

   225     def GetNearestData(self, tick, adjust):

   226         ticks = self.Data[:, 0]

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

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

   229             new_cursor -= 1

   230         elif adjust == 1 and ticks[new_cursor] < tick and new_cursor < len(ticks):

   231             new_cursor += 1

   232         return new_cursor

   233     

   234     def GetBounds(self):

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

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

   237             self.EndIdx = self.GetNearestData(self.StartTick + self.CurrentRange, 1)

   238     

   239     def ResetBounds(self):

   240         self.StartIdx = None

   241         self.EndIdx = None

   242     

   243     def RefreshCanvasRange(self):

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

   245             self.RangeValues = RANGE_VALUES

   246             self.CanvasRange.Clear()

   247             for text, value in RANGE_VALUES:

   248                 self.CanvasRange.Append(text)

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

   250             self.CurrentRange = RANGE_VALUES[0][1]

   251         elif self.RangeValues != TIME_RANGE_VALUES:

   252             self.RangeValues = TIME_RANGE_VALUES

   253             self.CanvasRange.Clear()

   254             for text, value in TIME_RANGE_VALUES:

   255                 self.CanvasRange.Append(text)

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

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

   258         

   259     def RefreshView(self, force=False):

   260         self.Freeze()

   261         if force or not self.Fixed or (len(self.Data) > 0 and self.StartTick + self.CurrentRange > self.Data[-1, 0]):

   262             if (self.MinValue is not None and 

   263                 self.MaxValue is not None and 

   264                 self.MinValue != self.MaxValue):

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

   266             else:

   267                 Yrange = 2. / self.CurrentZoom

   268             

   269             if not force and not self.Fixed and len(self.Data) > 0:

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

   271                                min(self.YCenter, 

   272                                    self.Data[-1, 1] + Yrange / 2))

   273             

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

   275             

   276             self.GetBounds()

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

   278                                                  legend=var_name, colour=colours[0])

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

   280             self.Canvas.Draw(self.GraphicsObject, 

   281                              xAxis=(self.StartTick, self.StartTick + self.CurrentRange),

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

   283         

   284             # Reset and draw cursor 

   285             self.ResetLastCursor()

   286             self.RefreshCursor()

   287         

   288         self.RefreshScrollBar()

   289         

   290         self.Thaw()

   291     

   292     def GetInstancePath(self):

   293         return self.InstancePath

   294     

   295     def IsViewing(self, tagname):

   296         return self.InstancePath == tagname

   297     

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

   299         value = {True:1., False:0.}.get(value, float(value))

   300         self.Data = numpy.append(self.Data, [[float(tick), value]], axis=0)

   301         if self.MinValue is None:

   302             self.MinValue = value

   303         else:

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

   305         if self.MaxValue is None:

   306             self.MaxValue = value

   307         else:

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

   309         if not self.Fixed or tick < self.StartTick + self.CurrentRange:

   310             self.GetBounds()

   311             while int(self.Data[self.StartIdx, 0]) < tick - self.CurrentRange:

   312                 self.StartIdx += 1

   313             self.EndIdx += 1

   314             self.StartTick = self.Data[self.StartIdx, 0]

   315         self.NewDataAvailable(None)

   316     

   317     def RefreshScrollBar(self):

   318         if len(self.Data) > 0:

   319             self.GetBounds()

   320             pos = int(self.Data[self.StartIdx, 0] - self.Data[0, 0])

   321             range = int(self.Data[-1, 0] - self.Data[0, 0])

   322         else:

   323             pos = 0

   324             range = 0

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

   326 

   327     def RefreshRange(self):

   328         if len(self.Data) > 0:

   329             if self.Fixed and self.Data[-1, 0] - self.Data[0, 0] < self.CurrentRange:

   330                 self.Fixed = False

   331             self.ResetBounds()

   332             if self.Fixed:

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

   334             else:

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

   336         self.RefreshView(True)

   337 

   338     def OnRangeChanged(self, event):

   339         try:

   340             if self.Ticktime == 0:

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

   342             else:

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

   344         except ValueError, e:

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

   346         wx.CallAfter(self.RefreshRange)

   347         event.Skip()

   348     

   349     def OnZoomChanged(self, event):

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

   351         wx.CallAfter(self.RefreshView, True)

   352         event.Skip()

   353     

   354     def OnPositionChanging(self, event):

   355         if len(self.Data) > 0:

   356             self.ResetBounds()

   357             self.StartTick = self.Data[0, 0] + event.GetPosition()

   358             self.Fixed = True

   359             self.NewDataAvailable(None, True)

   360         event.Skip()

   361 

   362     def OnResetButton(self, event):

   363         self.Fixed = False

   364         self.ResetView()

   365         event.Skip()

   366 

   367     def OnCurrentButton(self, event):

   368         if len(self.Data) > 0:

   369             self.ResetBounds()

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

   371             self.Fixed = False

   372             self.NewDataAvailable(None, True)

   373         event.Skip()

   374     

   375     def OnResetZoomOffsetButton(self, event):

   376         if len(self.Data) > 0:

   377             self.YCenter = (self.MaxValue + self.MinValue) / 2

   378         else:

   379             self.YCenter = 0.0

   380         self.CurrentZoom = 1.0

   381         self.CanvasZoom.SetSelection(0)

   382         wx.CallAfter(self.RefreshView, True)

   383         event.Skip()

   384     

   385     def OnExportGraphButtonClick(self, event):

   386         data_copy = self.Data[:]

   387         text = "tick;%s;\n" % self.InstancePath

   388         for tick, value in data_copy:

   389             text += "%d;%.3f;\n" % (tick, value)

   390         self.ParentWindow.SetCopyBuffer(text)

   391         event.Skip()

   392 

   393     def OnCanvasLeftDown(self, event):

   394         self.Fixed = True

   395         self.Canvas.canvas.CaptureMouse()

   396         if len(self.Data) > 0:

   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.Data[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 OnCanvasMiddleDown(self, event):

   418         self.Fixed = True

   419         self.Canvas.canvas.CaptureMouse()

   420         if len(self.Data) > 0:

   421             self.GetBounds()

   422             self.CurrentMousePos = event.GetPosition()

   423             self.CurrentMotionValue = self.Data[self.StartIdx, 0]

   424         event.Skip()

   425         

   426     def OnCanvasMiddleUp(self, event):

   427         self.CurrentMousePos = None

   428         self.CurrentMotionValue = None

   429         if self.Canvas.canvas.HasCapture():

   430             self.Canvas.canvas.ReleaseMouse()

   431         event.Skip()

   432         

   433     def OnCanvasMotion(self, event):

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

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

   436             graphics, xAxis, yAxis = self.Canvas.last_draw

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

   438             self.RefreshCursor()

   439         elif self.CurrentMousePos is not None and len(self.Data) > 0:

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

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

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

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

   444             self.ResetBounds()

   445             self.StartTick = max(self.Data[0, 0], min(self.CurrentMotionValue, self.Data[-1, 0] - self.CurrentRange))

   446             self.CurrentMousePos = event.GetPosition()

   447             self.NewDataAvailable(None, True)

   448         event.Skip()

   449 

   450     def OnCanvasMouseWheel(self, event):

   451         if self.CurrentMousePos is None:

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

   453             if event.ShiftDown():

   454                 current = self.CanvasRange.GetSelection()

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

   456                 if new != current:

   457                     if self.Ticktime == 0:

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

   459                     else:

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

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

   462                     wx.CallAfter(self.RefreshRange)

   463             else:

   464                 current = self.CanvasZoom.GetSelection()

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

   466                 if new != current:

   467                     self.CurrentZoom = ZOOM_VALUES[new][1]

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

   469                     wx.CallAfter(self.RefreshView, True)

   470         event.Skip()

   471 

   472     def OnCanvasResize(self, event):

   473         self.ResetLastCursor()

   474         wx.CallAfter(self.RefreshCursor)

   475         event.Skip()

   476 

   477     ## Reset the last cursor

   478     def ResetLastCursor(self):

   479         self.LastCursor = None

   480 

   481     ## Draw the cursor on graphic

   482     #  @param dc The draw canvas

   483     #  @param cursor The cursor parameters

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

   485         if self.StartTick <= cursor <= self.StartTick + self.CurrentRange:

   486             # Prepare temporary dc for drawing

   487             width = self.Canvas._Buffer.GetWidth()

   488             height = self.Canvas._Buffer.GetHeight()

   489             tmp_Buffer = wx.EmptyBitmap(width, height)

   490             dcs = wx.MemoryDC()

   491             dcs.SelectObject(tmp_Buffer)

   492             dcs.Clear()

   493             dcs.BeginDrawing()

   494             

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

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

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

   498             

   499             # Calculate clipping region

   500             graphics, xAxis, yAxis = self.Canvas.last_draw

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

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

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

   504             

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

   506             

   507             # Draw line cross drawing for diaplaying time cursor

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

   509             

   510             lines = ("X:%d\nY:%f" % (cursor, value)).splitlines()

   511             

   512             wtext = 0

   513             for line in lines:

   514                 w, h = dcs.GetTextExtent(line)

   515                 wtext = max(wtext, w)

   516             

   517             offset = 0

   518             for line in lines:

   519                 # Draw time cursor date

   520                 dcs.DrawText(line, min(px + 3, cx + cwidth - wtext), cy + 3 + offset)

   521                 w, h = dcs.GetTextExtent(line)

   522                 offset += h

   523             

   524             dcs.EndDrawing()

   525     

   526             #this will erase if called twice

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

   528     

   529     ## Refresh the variable cursor.

   530     #  @param dc The draw canvas

   531     def RefreshCursor(self, dc=None):

   532         if self:

   533             if dc is None:

   534                 dc = wx.BufferedDC(wx.ClientDC(self.Canvas.canvas), self.Canvas._Buffer)

   535             

   536             # Erase previous time cursor if drawn

   537             if self.LastCursor is not None:

   538                 self.DrawCursor(dc, *self.LastCursor)

   539             

   540             # Draw new time cursor

   541             if self.CursorIdx is not None:

   542                 self.LastCursor = self.Data[self.CursorIdx]

   543                 self.DrawCursor(dc, *self.LastCursor)