关于vc里画图形的程序。包括画多边形，错切，裁剪，旋转，变换，填充等等的操作。还包括中点画线算法等。-on vc Lane painting graphics procedures. Polygon, including painting, wrong cutting, cutting, rotating, transform, filled out the operation. Also included were dotted line algorithm.

vc++版本多边形裁剪算法，十分有用，适合初学者