基础知识
ellipse(100,100,100,100);//绘制椭圆(x,y,宽,高)
triangle(150,150,150,200,200,200);//绘制三角形(x1,y1,x2,y2,x3,y3)
quad(180,100,200,150,270,150,250,100);//绘制四边形(x1,y1,x2,y2,x3,y3,x4,y4)
rect(30, 20, 50, 50);//绘制矩形(x,y,宽,高)
line(0,0,100,100);//绘制线段(x1,y1,x2,y2)起点至终点
arc(200, 50, 50, 50, 0, HALF_PI);//绘制弧(x,y,宽,高,起始角度,终止角度)
## 代码