我们从Python开源项目中，提取了以下7个代码示例，用于说明如何使用wx.GCDC。
def Clear(self): """Erase the window.""" self.last_PointLabel = None # reset pointLabel dc = wx.BufferedDC(wx.ClientDC(self.canvas), self._Buffer) bbr = wx.Brush(self.GetBackgroundColour(), wx.SOLID) dc.SetBackground(bbr) dc.SetBackgroundMode(wx.SOLID) dc.Clear() if self._antiAliasingEnabled: try: dc = wx.GCDC(dc) except Exception: pass dc.SetTextForeground(self.GetForegroundColour()) dc.SetTextBackground(self.GetBackgroundColour()) self.last_draw = None
def OnTimer(self, event): if self.World is not None: # Graphics Update self.bdc = wx.BufferedDC(self.cdc, self.bmp) self.gcdc = wx.GCDC(self.bdc) self.gcdc.Clear() self.gcdc.SetPen(wx.Pen('white')) self.gcdc.SetBrush(wx.Brush('white')) self.gcdc.DrawRectangle(0,0,640,640) for ag in [self.World.A]: ag.Draw(self.gcdc) self.World.BBox.Draw(self.gcdc) self.World.Course.Draw(self.gcdc)
def OnPaint(self, event): # All that is needed here is to draw the buffer to screen if self.last_PointLabel != None: self._drawPointLabel(self.last_PointLabel) # erase old self.last_PointLabel = None dc = wx.BufferedPaintDC(self.canvas, self._Buffer) if self._antiAliasingEnabled: try: dc = wx.GCDC(dc) except Exception: pass
def OnPrintPage(self, page): dc = self.GetDC() # allows using floats for certain functions # Note PPIScreen does not give the correct number # Calulate everything for printer and then scale for preview PPIPrinter = self.GetPPIPrinter() # printer dots/inch (w,h) # PPIScreen= self.GetPPIScreen() # screen dots/inch (w,h) dcSize = dc.GetSize() # DC size if self.graph._antiAliasingEnabled and not isinstance(dc, wx.GCDC): try: dc = wx.GCDC(dc) except Exception: pass else: if self.graph._hiResEnabled: # high precision - each logical unit is 1/20 of a point dc.SetMapMode(wx.MM_TWIPS) pageSize = self.GetPageSizePixels() # page size in terms of pixcels clientDcSize = self.graph.GetClientSize() # find what the margins are (mm) margLeftSize, margTopSize = self.graph.pageSetupData.GetMarginTopLeft() margRightSize, margBottomSize = self.graph.pageSetupData.GetMarginBottomRight() # calculate offset and scale for dc pixLeft = margLeftSize * PPIPrinter[0] / 25.4 # mm*(dots/in)/(mm/in) pixRight = margRightSize * PPIPrinter[0] / 25.4 pixTop = margTopSize * PPIPrinter[1] / 25.4 pixBottom = margBottomSize * PPIPrinter[1] / 25.4 plotAreaW = pageSize[0] - (pixLeft + pixRight) plotAreaH = pageSize[1] - (pixTop + pixBottom) # ratio offset and scale to screen size if preview if self.IsPreview(): ratioW = float(dcSize[0]) / pageSize[0] ratioH = float(dcSize[1]) / pageSize[1] pixLeft *= ratioW pixTop *= ratioH plotAreaW *= ratioW plotAreaH *= ratioH # rescale plot to page or preview plot area self.graph._setSize(plotAreaW, plotAreaH) # Set offset and scale dc.SetDeviceOrigin(pixLeft, pixTop) # Thicken up pens and increase marker size for printing ratioW = float(plotAreaW) / clientDcSize[0] ratioH = float(plotAreaH) / clientDcSize[1] aveScale = (ratioW + ratioH) / 2 if self.graph._antiAliasingEnabled and not self.IsPreview(): scale = dc.GetUserScale() dc.SetUserScale( scale[0] / self.graph._pointSize[0], scale[1] / self.graph._pointSize[1]) self.graph._setPrinterScale(aveScale) # tickens up pens for printing self.graph._printDraw(dc) # rescale back to original self.graph._setSize() self.graph._setPrinterScale(1) self.graph.Redraw() # to get point label scale and shift correct return True #----------------------------------------------------------------------
def OnPaint(self, event): dc = wx.BufferedPaintDC(self) dc.Clear() dc.BeginDrawing() gc = wx.GCDC(dc) width, height = self.GetClientSize() gc.SetPen(wx.Pen(wx.NamedColour("GREY"), 3)) gc.SetBrush(wx.GREY_BRUSH) gc.DrawLines(ArrowPoints(wx.TOP, width * 0.75, width * 0.5, 2, (width + height) / 4 - 3)) gc.DrawLines(ArrowPoints(wx.TOP, width * 0.75, width * 0.5, 2, (width + height) / 4 + 3)) gc.DrawLines(ArrowPoints(wx.BOTTOM, width * 0.75, width * 0.5, 2, (height * 3 - width) / 4 + 3)) gc.DrawLines(ArrowPoints(wx.BOTTOM, width * 0.75, width * 0.5, 2, (height * 3 - width) / 4 - 3)) thumb_rect = self.GetThumbRect() exclusion_rect = wx.Rect(thumb_rect.x, thumb_rect.y, thumb_rect.width, thumb_rect.height) if self.Parent.IsMessagePanelTop(): exclusion_rect.y, exclusion_rect.height = width, exclusion_rect.y + exclusion_rect.height - width if self.Parent.IsMessagePanelBottom(): exclusion_rect.height = height - width - exclusion_rect.y if exclusion_rect != thumb_rect: colour = wx.NamedColour("LIGHT GREY") gc.SetPen(wx.Pen(colour)) gc.SetBrush(wx.Brush(colour)) gc.DrawRectangle(exclusion_rect.x, exclusion_rect.y, exclusion_rect.width, exclusion_rect.height) gc.SetPen(wx.GREY_PEN) gc.SetBrush(wx.GREY_BRUSH) gc.DrawPolygon(ArrowPoints(wx.TOP, width, width, 0, 0)) gc.DrawPolygon(ArrowPoints(wx.BOTTOM, width, width, 0, height)) gc.DrawRectangle(thumb_rect.x, thumb_rect.y, thumb_rect.width, thumb_rect.height) dc.EndDrawing() event.Skip()
def draw(self, drawDC=None): """ Render the figure. """ # Render figure using agg FigureCanvasAgg.draw(self) # Get bitmap of figure rendered self.bitmap = _convert_agg_to_wx_bitmap(self.get_renderer(), None) if wx.VERSION < (3, 0, 0): self.bitmap.UseAlpha() # Create DC for rendering graphics in bitmap destDC = wx.MemoryDC() destDC.SelectObject(self.bitmap) # Get Graphics Context for DC, for anti-aliased and transparent # rendering destGC = wx.GCDC(destDC) destGC.BeginDrawing() # Get canvas size and figure bounding box in canvas width, height = self.GetSize() bbox = self.GetAxesBoundingBox() # If highlight to display is resize, draw thick grey line at bottom # side of canvas if self.Highlight == HIGHLIGHT_RESIZE: destGC.SetPen(HIGHLIGHT_RESIZE_PEN) destGC.SetBrush(HIGHLIGHT_RESIZE_BRUSH) destGC.DrawRectangle(0, height - 5, width, 5) # If highlight to display is merging graph, draw 50% transparent blue # rectangle on left or right part of figure depending on highlight type elif self.Highlight in [HIGHLIGHT_LEFT, HIGHLIGHT_RIGHT]: destGC.SetPen(HIGHLIGHT_DROP_PEN) destGC.SetBrush(HIGHLIGHT_DROP_BRUSH) x_offset = (bbox.width / 2 if self.Highlight == HIGHLIGHT_RIGHT else 0) destGC.DrawRectangle(bbox.x + x_offset, bbox.y, bbox.width / 2, bbox.height) # Draw other Viewer common elements self.DrawCommonElements(destGC, self.GetButtons()) destGC.EndDrawing() self._isDrawn = True self.gui_repaint(drawDC=drawDC)
def RefreshViewer(self): """ Method that refresh the content displayed by Viewer """ # Create buffered DC for drawing in panel width, height = self.GetSize() bitmap = wx.EmptyBitmap(width, height) dc = wx.BufferedDC(wx.ClientDC(self), bitmap) dc.Clear() # Get Graphics Context for DC, for anti-aliased and transparent # rendering gc = wx.GCDC(dc) gc.BeginDrawing() # Get first item item = self.ItemsDict.values()[0] # Get item variable path masked according Debug Variable Panel mask item_path = item.GetVariable( self.ParentWindow.GetVariableNameMask()) # Draw item variable path at Viewer left side w, h = gc.GetTextExtent(item_path) gc.DrawText(item_path, 20, (height - h) / 2) # Update 'Release' button state and text color according to item forced # flag value item_forced = item.IsForced() self.Buttons[1].Enable(item_forced) self.RefreshButtonsPosition() if item_forced: gc.SetTextForeground(wx.BLUE) # Draw item current value at right side of Viewer item_value = item.GetValue() w, h = gc.GetTextExtent(item_value) gc.DrawText(item_value, width - 40 - w, (height - h) / 2) # Draw other Viewer common elements self.DrawCommonElements(gc) gc.EndDrawing()
