asp.net GDI+把图片绘制成自定义的椭圆形状

 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(400, 200);
15         Graphics g = Graphics.FromImage(bitmap);
16         g.Clear(Color.White);
17         TextureBrush mytextbrush = new TextureBrush(System.Drawing.Image.FromFile(Server.MapPath("~/images/001aa.jpg")));
18         g.FillEllipse(mytextbrush,0,0,400,200);
19         System.IO.MemoryStream ms=new System.IO.MemoryStream();
20         bitmap.Save(ms,System.Drawing.Imaging.ImageFormat.Jpeg);
21         Response.ClearContent();
22         Response.ContentType = "image/Jpeg";
23         Response.BinaryWrite(ms.ToArray());
24     }
25 }