一个VC双缓冲绘图例子,解决了屏幕闪烁的缺点,可以绘制鼠标轨迹任意曲线,另外可以实现打开,修改和保存图片等.-A double buffer drawing VC example, to solve the shortcomings of the screen flashes, you can draw any curve track the mouse, and can open, edit and save pictures.