C#编写，实现windows画图程序的所有功能，并且有撤销功能（支持50次），此外还可能对图形进行旋转、缩放、平移、裁剪。曲线为Bezier曲线-All functions written in C#, windows Paint program, and the Undo function (support 50) In addition, the graphics may rotate, zoom, pan, cutting. Curve for Bezier curves