简单的图形绘制软件包示例程序：要求能实现画文本、画线、三角形、矩形和点的绘制及菜单。-Simple drawing package sample program: Request to draw text, draw lines, triangles, rectangles, and points to draw menu

根据外接矩形画圆，用的opengl程序画图的代码，可自行修改使用~-According circle enclosing rectangle, with the opengl drawing code program can modify to use ~