asp.net GDI+ 绘制椭圆 ，弧线，扇形

 1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Web;
 5 using System.Web.UI;
 6 using System.Web.UI.WebControls;
 7 using System.Drawing;
 8 using System.Drawing.Drawing2D;
 9 
10 public partial class _Default : System.Web.UI.Page
11 {
12     protected void Page_Load(object sender, EventArgs e)
13     {
14         Bitmap bitmap = new Bitmap(360, 260);
15         Graphics g = Graphics.FromImage(bitmap);
16         g.Clear(Color.White);
17         Pen pen = new Pen(Color.Blue, 2);
18         Rectangle[] rects = { new Rectangle(10, 10, 100, 200), new Rectangle(100, 200, 250, 50), new Rectangle(100, 50, 150, 150) };
19         g.DrawEllipse(pen, rects[0]);//绘制椭圆
20         pen.Color = Color.Red;
21         g.DrawArc(pen, rects[1], -60, 180);//绘制弧线
22         pen.Color = Color.Turquoise;
23         g.DrawPie(pen, rects[2], 60, -120);//绘制扇形
24         System.IO.MemoryStream ms = new System.IO.MemoryStream();
25         bitmap.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
26         Response.ClearContent();
27         Response.ContentType = "image/Jpeg";
28         Response.BinaryWrite(ms.ToArray());
29     }
30 }