一个画笔程序的例子，有很多种画图的例子，值得推荐-Examples of a brush, there are many examples of drawing, it is recommended

这是我用Edraw专业绘图工具画的物理结构图的源文件（需使用Edraw打开）。-This is my drawing tools with Edraw major draw of the physical structure of the source file (to use Edraw to open).