Asp.NET生成饼状图
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;
public partial class Admin_Drawing_Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
Response.ContentType = "image/jpeg";
const int width = 180, height = 150;
int x = 30, y = 50;
int pieWidth = 120, pieHeight = 50, pieShadow = 20;
int[] arrVote = { 100, 50, 100,60,50};
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);
objGraphics.Dispose();
objBitmap.Dispose();
}
}