画图，提供一般的画图功能，包括（点，直线，矩形，椭圆，多边形等）-drawing for the general drawing functions, including (point, line, rectangle, ellipse, polygon, etc.)

这是国内的一个关于多边形裁剪的算法，虽然它没有实际的代码,但是说明很清楚.分析很精辟,很有特点.-This is a domestic polygon clipping of the algorithm, although it does not have the actual code, But note very clearly. analysis is very brilliant and very unique.

多边形的绘制！主要使用VC6.0实现！已调试，可以实现！-Polygon drawing! The main use VC6.0 achieve! Debugging can be achieved!