asp net生成饼状图

1、asp net生成饼状图生成饼状图2011年05月25日最近在看知识类的网站,大家觉得这两个网站都不错:99or知识堂 english:hotaskinfo 搜索:baidu 朋友最近做的几个聚合类网站，看看 1sjk聚合 9ashop文章 国外google:google 几个在博客园的朋友:程序人生.NET 数据库天地 WEB开发狂 从事.NET开发已经3年,现专注于PHP的程序开发。PHP的要求更高,但是.NET让我无法放手。 一下为cs文件内容，数据库自己建，很简单的 using System.Collections.Generic; using System.Linq; 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.WebCont

2、rols; using System.Web.UI.HtmlControls; using System.Drawing.Imaging; using System.Data.SqlClient; using System.Configuration; public partial class _Default : System.Web.UI.Page protected void Page_Load(object sender, EventArgs e) string connectionstring = ConfigurationManager.ConnectionStringsgwDBConnec tionString.ConnectionString; /gwDBConnectionString为config中连接数据库的name属性 SqlConnection conn = new SqlConnection(connectionstring); string com = select Sell_Sales,Sell_Quarter from tb_Sells order b

3、y Sell_Id; SqlCommand cmd = new SqlCommand(com, conn); conn.Open(); SqlDataReader mysqlDR = cmd.ExecuteReader(); int sales = new int4; string quarter = new string4; int index = 0; while (mysqlDR.Read() salesindex = mysqlDR.GetInt32(0); quarterindex =第+ mysqlDR.GetInt32(1).ToString() + 季度：; index+; conn.Close(); mysqlDR.Close(); Bitmap bm = new Bitmap(600, 300); /创建一个长度为600，宽带为300的Bitmap实例 Graphics g = Graphics.FromImage(bm); /由此Bitmap实例创建Graphic实例 g.Clear(Color.White); g.DrawString(年度销售情况一览表, ne

4、w Font(华文行楷, 16), Brushes.Blue, new Point(5, 5); Point myRec = new Point(500, 30); Point myDec = new Point(520, 30); Point myTxt = new Point(570, 30); g.DrawString(单位：万元, new Font(宋体, 9), Brushes.Black, new Point(515, 12); for (int i = 0; i quarter.Length; i+) g.FillRectangle(new SolidBrush(getColor(i), myRec.X, myRec.Y, 20, 10); /填充小方块 g.DrawRectangle(Pens.Black, myRec.X, myRec.Y, 20, 10); /绘制小方块 g.DrawString(quarteri.ToString(), new Font(宋体, 9), Brushes.Black, myDec); /绘制小方块右边的文字 g.DrawString(

5、salesi.ToString(), new Font(宋体, 9), Brushes.Black, myTxt); myRec.Y += 15; myDec.Y += 15; myTxt.Y += 15; int total = 0; float fCurrentAngle = 0; float fStartAngle = 0; for (int i = 0; i sales.Length; i+) total = total + salesi; for (int i = 0; i sales.Length; i+) /以下代码是获得要绘制扇型的开始角度 if (i = sales.Length - 1) fCurrentAngle = 360 - fStartAngle; else int iTemp = salesi; fCurrentAngle = (iTemp * 360) / total; /根据参数绘制扇型 g.DrawPie(Pens.WhiteSmoke, 100, 40, 250, 250, fStartAngle, fCurrentAngle); /以指定色彩填充

6、绘制的扇型 g.FillPie(new SolidBrush(getColor(i), 100, 40, 250, 250, fStartAngle, fCurrentAngle); fStartAngle += fCurrentAngle; /画出图片的边框 Pen p = new Pen(Color.Black, 1); g.DrawRectangle(p, 1, 1, 598, 298); /向客户端输出数据流，并以此数据流形成Jpeg图片 bm.Save(Response.OutputStream, ImageFormat.Jpeg); private Color getColor(int itemIndex) Color MyColor; int i = itemIndex; switch (i) case 0: MyColor = Color.DarkGray; return MyColor; case 1: MyColor = Color.CadetBlue; return MyColor; case 2: MyColor = Color.Yellow; return MyColor; case 3: MyColor = Color.Peru; return MyColor; default: MyColor = Color.Green; return MyColor; 预览如下图：

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