在vc++中使用鼠标移动的方式， 绘制指出各种颜色，各种线形，各种粗细曲线，且曲线随这鼠标的移动而绘制，当鼠标停止移动时，绘制曲线的功能也随着消失。-In vc++ in a way to use mouse and draw that a variety of colors, a variety of linear, various thickness of the curve, and the curve with the mouse movement and drawing, when t