一个经典的绘图软件代码，器界面酷似Auto CAD，可以实现绘制圆、三角形、矩形多边形等常用图形，还可以对这些图形进行各种不同的操作-A classical mapping software code interface like Auto CAD, can be drawn circle, triangle, rectangle and other commonly used polygonal graphics, these graphics can also conduct various