这是一个软件实习的作业程序，功能是给定三个顶点，画出三角形和其内切圆、外接圆，并且绘制坐标系、图例。 而且视图可以拖动、缩放。图形有不同颜色显示。-This is the job of a software internship program, the function is given three vertices, draw a triangle and its inscribed circle, circumscribed circle, and draw a coordinate