图形学中的扫描线填充算法，用VC6.0的MFC实现，较为精炼。使用Getpixel函数和setpixel对像素点颜色取反。-Graphics of the scan line fill algorithm, the MFC with VC6.0 achieve more refined. Setpixel use Getpixel function and color of pixel anti-access.