default.aspx.cs

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using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

using System.Drawing;
using System.Drawing.Drawing2D;

public partial class _Default : System.Web.UI.Page 
{
    protected void Page_Load(object sender, EventArgs e)
    {
        Bitmap bitmap = new Bitmap(400, 150);
        Graphics g = Graphics.FromImage(bitmap);
        g.Clear(Color.White);
        Rectangle myRectangle = new Rectangle(40, 20, 90, 70);
        LinearGradientBrush LGBrush = new LinearGradientBrush(myRectangle, Color.Red, Color.YellowGreen, LinearGradientMode.ForwardDiagonal);
        g.FillEllipse(LGBrush, myRectangle);
        Point centerPoint = new Point(250, 60);
        GraphicsPath path = new GraphicsPath();
        int R = 20;
        path.AddEllipse(centerPoint.X - R, centerPoint.Y - R, 2 * R, 2 * R);
        path.AddEllipse(centerPoint.X - 2 * R, centerPoint.Y - 2 * R, 4 * R, 4 * R);
        path.AddEllipse(centerPoint.X - 3 * R, centerPoint.Y - 3 * R, 6 * R, 6 * R);
        PathGradientBrush brush = new PathGradientBrush(path);
        //指定路径中心点
        brush.CenterPoint = centerPoint;
        //指定路径中心点的颜色
        brush.CenterColor = Color.Gray;
        //Color类型的数组指定与路径上每个顶点对应的颜色
        brush.SurroundColors = new Color[] { Color.Red, Color.Green, Color.Snow};
        g.FillPath(brush, path);
        System.IO.MemoryStream ms = new System.IO.MemoryStream();
        bitmap.Save(ms, System.Drawing.Imaging.ImageFormat.Gif);
        Response.ClearContent();
        Response.ContentType = "image/Gif";
        Response.BinaryWrite(ms.ToArray());
    }
}