代码：
private void button1_Click(object sender, System.EventArgs e)
{
Graphics g = this.CreateGraphics();
g.Clear(Color.White);
//g.InterpolationMode = InterpolationMode.HighQualityBicubic;
g.CompositingQuality = CompositingQuality.HighQuality;
g.SmoothingMode = SmoothingMode.HighQuality;
int radius = 200;
CircularTextualLayout ctl = new CircularTextualLayout();
ctl.Radius = radius;
Point location = new Point(50, 20);
//ctl.CenterPoint = new Point(location.X + radius, location.Y + radius);
ctl.TextDrawing = "方正姚体方正姚体方正姚体方正姚体";
float arcAngle = 270;
ctl.ArcAngle = arcAngle;
ctl.AngleStart = -arcAngle/2 + arcAngle/2/ctl.TextDrawing.Length;
ctl.TextFontInner = new Font("方正姚体", radius/3.2f);
ctl.RatioX = 0.6f;
ctl.BorderWidth = (int)(ctl.Radius / 40);
//ctl.IsBold = false;
ctl.Location = location;
ctl.WordsColor = Color.FromArgb(250, Color.Red);
ctl.BorderColor = Color.FromArgb(250, Color.Red);
ctl.RectColor = Color.FromArgb(250, Color.Red);
ctl.Draw(g);
g.Dispose();
}
