waveform.py 文件源码

def draw_box(self):
        x1, x2 = self.plot._point2ClientCoord(*self.selected)[::2]
        dc = wx.ClientDC(self.plot.canvas)
        dc.SetLogicalFunction(wx.INVERT)
        dc.DrawRectangle(x1, 0, x2, dc.GetSize()[1])
        dc.SetLogicalFunction(wx.COPY)

    # def clear(self):
    #     # An experimental way to clear the canvas without redrawing the plot every time
    #     # dc.Blit() usage from SOF.
    #     if self.selection_drawn:
    #         self.draw_box()  # clear old
    #         self.selection_drawn = False
    #     dc = wx.ClientDC(self.plot.canvas)
    #     size = dc.GetSize()
    #     bmp = wx.Bitmap(size.width, size.height)
    #     prev_dc = wx.MemoryDC()
    #     prev_dc.SelectObject(bmp)
    #     prev_dc.Blit(
    #         0,  # Copy to this X coordinate
    #         0,  # Copy to this Y coordinate
    #         size.width,  # Copy this width
    #         size.height,  # Copy this height
    #         dc,  # From where do we copy?
    #         0,  # What's the X offset in the original DC?
    #         0  # What's the Y offset in the original DC?
    #     )
    #     prev_dc.SelectObject(wx.NullBitmap)
    #     dc.Clear()
    #     dc.DrawBitmap(bmp, 0, 0)
    #     # if self.plot.last_draw is not None:
    #     #     self.plot.Draw(self.plot.last_draw[0])