def on_paint(self, e=None):
dc = BufferedPaintDC(self)
# Draw empty background
b = wx.WHITE_BRUSH #Brush(Color(40, 40, 40)) @UndefinedVariable
#b.SetStipple(self.stipple)
dc.Brush = b
dc.Pen = wx.TRANSPARENT_PEN #@UndefinedVariable
dc.DrawRectangle(0, 0, *self.Size)
# Draw the bitmap
self.paint_bitmap(dc)
# Draw the picker square
dc.Brush = wx.TRANSPARENT_BRUSH #@UndefinedVariable
dc.Pen = wx.RED_PEN #@UndefinedVariable
x, y = self.middle
x -= self.picksize[0] / 2
y -= self.picksize[1] / 2
dc.SetLogicalFunction(wx.INVERT)
dc.DrawRectangle(x, y, self.picksize[0], self.picksize[1])
