def Draw(self, dc, op = wx.COPY):
        if self.src.dragging or self.dst.dragging:
            return
        if self.flashcount:
            pen = wx.Pen("GOLD")
        else:
            pen = wx.Pen("BLUE")
        pen.SetWidth(4)
        dc.SetPen(pen)
        dc.DrawLine(self.src.model.pos[0], self.src.model.pos[1], self.dst.model.pos[0], self.dst.model.pos[1])