Asp.Net 使用 GDI+ 绘制3D饼图入门篇源码

topn3dpie.aspx
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<%@ Page language="c#" CodeBehind="topn3dpie.aspx.cs" AutoEventWireup="false" Inherits="Yeefly.topn3dpie" %>

topn3dpie.aspx.cs
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using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Drawing.Imaging;
using System.Drawing.Drawing2D;
using System.IO;

namespace Yeefly
{
 /// <summary>
 /// Graph 的摘要说明。
 /// </summary>
 public class topn3dpie : System.Web.UI.Page
 {
  private void Page_Load(object sender, System.EventArgs e)
  {
   Response.ContentType = "image/jpeg";
   const int width = 300, height = 300;
   int x = 30, y = 50;

   int pieWidth = 120, pieHeight = 40, pieShadow = 15;
   int[] arrVote = {70,90,80,20,60,40};
   Random oRan = new Random();
 

   Bitmap objBitmap = new Bitmap(width, height);
   Graphics objGraphics = Graphics.FromImage(objBitmap);
   objGraphics.DrawRectangle(new Pen(Color.Black),0,0,width,height);
   objGraphics.FillRectangle(new SolidBrush(Color.White), 1, 1,width - 2, height - 2);
   SolidBrush objBrush = new SolidBrush(Color.Blue);
   objGraphics.SmoothingMode = SmoothingMode.AntiAlias;
 
   int iCurrentPos   = 0;

   Color[] arrColor = {Color.Red,Color.Red,Color.Red,Color.Red,Color.Red,Color.Red};

   for(int i = arrVote.Length - 1 ; i >= 0; i--)
   {
    arrColor[i] = Color.FromArgb(oRan.Next(255), oRan.Next(255), oRan.Next(255));
   }

   for(int i = arrVote.Length - 1 ; i >= 0; i--)
   {
    objBrush.Color = arrColor[i];
    for(int iLoop2 = 0; iLoop2 < pieShadow; iLoop2++)
     objGraphics.FillPie(new HatchBrush(HatchStyle.Percent50,objBrush.Color),x, y + iLoop2, pieWidth, pieHeight, iCurrentPos, arrVote[i]);
    iCurrentPos += arrVote[i];
   }

   iCurrentPos  = 0;
   for(int i = arrVote.Length - 1 ; i >= 0;i--)
   {
    objBrush.Color = arrColor[i];
    objGraphics.FillPie(objBrush,x, y, pieWidth, pieHeight, iCurrentPos, arrVote[i]);
    iCurrentPos += arrVote[i];
   }

   objBitmap.Save(Response.OutputStream, ImageFormat.Jpeg);
   // clean up...
   objGraphics.Dispose();
   objBitmap.Dispose();
  }

  #region Web 窗体设计器生成的代码
  override protected void OnInit(EventArgs e)
  {
   //
   // CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。
   //
   InitializeComponent();
   base.OnInit(e);
  }
 
  /// <summary>
  /// 设计器支持所需的方法 - 不要使用代码编辑器修改
  /// 此方法的内容。
  /// </summary>
  private void InitializeComponent()
  {   
   this.Load += new System.EventHandler(this.Page_Load);
  }
  #endregion
 }
}