squaremap.py 文件源码

def OnSize(self, event):
        # The buffer is initialized in here, so that the buffer is always
        # the same size as the Window.
        if event is None:
            return 0,0
        width, height = self.GetClientSize()
        if width <= 0 or height <=0:
            return 0,0
        # Make new off-screen bitmap: this bitmap will always have the
        # current drawing in it, so it can be used to save the image to
        # a file, or whatever.
        if width and height:
            # Macs can generate events with 0-size values
            self._buffer = wx.Bitmap(width, height)
            self.UpdateDrawing()