一个类Windows画图板的源代码，这个代码功能有所加强，增加了滤镜功能，工具箱里的工具也丰富很多，但也有一些小问题，如复制、粘贴好像有问题。喜欢的朋友大家自己修改一下吧。-Windows drawing board of a class' s source code, the code function has been enhanced, an increase of filter functions, the tool kit is also rich in many, but th