功能强大，使用操作方便的二维CAD画图软件源码，能支持基本的图形，颜色设置，鼠标控制放大缩小和选择等，具有很好的参考意义。-Powerful, easy to use two-dimensional CAD drawing software source code, can support the basic graphics, color settings, mouse control zoom and selection, etc., with a good reference.