Asp.Net 使用 GDI 绘制3D饼图入门篇源码

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

topn3dpie.aspx.cs
-----------------
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
}
}