绘制 饼状图形

//后台 代码using System;using System.Data;using System.Configuration;using System.Collections;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.Imaging;using System.Drawing.Text;using System.Text;using System.Drawing;public partial class Default4 : System.Web.UI.Page{ protected void Page_Load(object sender, EventArgs e) { Bitmap objBitmap; Graphics objGraphics; //建立画布 objBitmap = new Bitmap(400, 440); objGraphics = Graphics.FromImage(objBitmap); //填充背景 objGraphics.Clear(Color.White); //绘制饼状图 Pen p = new Pen(Color.Yellow, 0); Rectangle rect = new Rectangle(10, 10, 380, 380); objGraphics.DrawEllipse(p, rect); //填充饼状图 Brush b1 = new SolidBrush(Color.Red); Brush b2 = new SolidBrush(Color.Green); Brush b3 = new SolidBrush(Color.Blue); objGraphics.FillPie(b1, rect, 0f, 120f); objGraphics.FillPie(b2, rect, 120f, 120f); objGraphics.FillPie(b3, rect, 240f, 120f); //绘制文字 FontFamily fontfml = new FontFamily(GenericFontFamilies.Serif); Font font = new Font(fontfml, 20); SolidBrush brush = new SolidBrush(Color.Blue); objGraphics.DrawString("ASP.NET 绘图示例", font, brush, 50, 400); //输出并保存图象 objBitmap.Save(Response.OutputStream, ImageFormat.Gif); objBitmap.Save(Server.MapPath("x.jpg"), ImageFormat.Jpeg); //结束绘制 objBitmap.Dispose(); objGraphics.Dispose(); }}