画填充圆: Graphics gra = this.pictureBox1.CreateGraphics(); gra.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias; Brush bush = new SolidBrush(Color.Green);//填充的颜色 gra.FillEllipse(bush, , , , );//画填充椭圆的方法,x坐标.y坐标.宽.高,如果是100,则半径为50 画圆圈: Gra…