05年电子设计竞赛中，悬挂画圆，画直线，画方框。本人在校期间将其实现，效果不错，可惜当时没参加比赛，有信心进入国家赛啊。有详细代码注释！-Electronic Design Contest in 2005, hanging circle, draw a straight line, a rectangle. I am in school to achieve good results, but unfortunately it did not participate in the competi