可以实现铅笔、画刷、颜色选择、多边形及其多种状态、撤销、橡皮等多功能，几乎涵盖了所有windows自带的画图板功能-Can be achieved pencils, paint brushes, color choices, and a variety of polygons, and revocation, rubber and other multi-functional, almost covered all the windows, bringing the drawing board