C#使用Graphics画圆写字

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, 10, 10, 100, 100);//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：

Graphics gra = this.pictureBox1.CreateGraphics();

gra.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;

Pen pen = new Pen(Color.Pink);//画笔颜色

gra.DrawEllipse(pen, 250, 10, 100, 100);//画椭圆的方法，x坐标、y坐标、宽、高，如果是100，则半径为50

写字：

Graphics gra = this.pictureBox1.CreateGraphics();

Font myFont = new Font("宋体", 60, FontStyle.Bold);

Brush bush = new SolidBrush(Color.Red);//填充的颜色

gra.DrawString("堵塞！", myFont, bush, 100, 100);

http://www.cnblogs.com/sosoft/