该程序实现各种图形图像的绘制，包括直线、折线、圆形、矩形、椭圆、随机线等的绘制，另外还可以添加文本，实现刷新等功能-The program to achieve a variety of graphics rendering, including straight line, polyline, circle, rectangle, ellipse, Draw random lines, etc., can also add text, and other functions to achiev