本程序介绍的是拖曳法中的橡皮条法,是鼠标交互式制图的一部分,本程序使用函数设置绘图模式并且通过正确处理鼠标移动消息实现橡皮条法绘图-This procedure is the introduction of rubber drag law and law is an interactive graphics as part of the mouse, the procedures set graphics mode using the function and correct handling