创建简单的柱状和饼状统计图

using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Drawing;
using System.Drawing.Imaging;
namespace aspCharts
{
    /**//// <summary>
    /// Chart 的摘要说明。
    /// </summary>
    public partial class Chart : System.Web.UI.Page
    {
        protected void Page_Load(object sender, System.EventArgs e)
        {

            Graphics objGraphics;//建立画板对象
            Bitmap objBitMap = new Bitmap(600,300);//建立位图对象
            objGraphics = Graphics.FromImage(objBitMap);//根据位图对象建立画板对象
            objGraphics.Clear(Color.White);//设置画板对象的背景色
            int[] arrValues={0,0,0,0,0,0};//数据数组
            arrValues[0]=50;
            arrValues[1]=70;
            arrValues[2]=90;
            arrValues[3]=100;
            arrValues[4]=140;
            arrValues[5]=220;
            string[] arrValueNames={"0","0","0","0","0","0"};//月份

            arrValueNames[0] = "一月";
            arrValueNames[1]="二月";
            arrValueNames[2] = "三月";
            arrValueNames[3]="四月";
            arrValueNames[4]="五月";
            arrValueNames[5]="六月";

            objGraphics.DrawString("上半年销售情况统计",new Font("宋体",16),Brushes.Black,new PointF(0,0));

            //创建图例文字
            PointF symbolLeg = new PointF(335,20);
            PointF descLeg = new PointF(360,16);

            //画出图例。利用objGraphics图形对象的三个方法画出图例：
            //FillRectangle()方法画出填充矩形，DrawRectangle()方法画出矩形的边框，
            //DrawString()方法画出说明文字。这三个图形对象的方法在 .NET 框架类库类库中均已重载，
            //可以很方便根据不同的参数来画出图形。

            for(int i=0;i<arrValueNames.Length;i++)//画出各个月的标示图形
            {
                objGraphics.FillRectangle(new SolidBrush(GetColor(i)),symbolLeg.X,symbolLeg.Y,20,10);

                objGraphics.DrawRectangle(Pens.Black,symbolLeg.X,symbolLeg.Y,20,10);

                objGraphics.DrawString(arrValueNames[i].ToString(),new Font("宋体",10),Brushes.Black,descLeg);

                symbolLeg.Y += 15;
                descLeg.Y += 15;
            }

            for(int j = 0;j<arrValues.Length;j++)//画矩形图
            {
                objGraphics.FillRectangle(new SolidBrush(GetColor(j)),(j*35)+15,200-arrValues[j],20,arrValues[j]+5);
                objGraphics.DrawRectangle(Pens.Black,(j*35)+15,200-arrValues[j],20,arrValues[j]+5);
            }

            float sglCurrentAngle;
            float sglTotalAngle=0;

            for(int a=0;a<arrValues.Length-1;a++)
            {
                sglTotalAngle += arrValues[a];//取得数据总量
            }

            for(int b=0;b<arrValues.Length;b++)
            {
                sglCurrentAngle = arrValues[b]/sglTotalAngle*360;//求出该数据所占总数据的百分比
                objGraphics.FillPie(new SolidBrush(GetColor(b)),220,95,100,100,sglTotalAngle,sglCurrentAngle);//画出椭圆
                sglTotalAngle+=sglCurrentAngle;
            }

            objBitMap.Save(Response.OutputStream,ImageFormat.Gif);//该位图对象以"GIF"格式输出


        }

        private Color GetColor(int itemIndex)
        {
            Color objColor = new Color();
            switch(itemIndex)
            {
                case 0:
                    objColor = Color.Blue;
                    break;
                case 1:
                    objColor = Color.Yellow;
                    break;
                case 2:
                    objColor = Color.Red;
                    break;
                case 3:
                    objColor = Color.Orange;
                    break;
                case 4:
                    objColor = Color.Purple;
                    break;
                case 5:
                    objColor = Color.Brown;
                    break;
                case 6:
                
                default:
                    objColor = Color.Blue;
                    break;
            }

            return objColor;
        }

        Web 窗体设计器生成的代码#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()
        {    
        }
        #endregion
    }
}

<%@ Page language="c#" Inherits="aspCharts.Chart" CodeFile="Chart.aspx.cs" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<HTML>
    <HEAD>
        <title>Chart</title>
        <meta name="GENERATOR" Content="Microsoft Visual Studio .NET 7.1">
        <meta name="CODE_LANGUAGE" Content="C#">
        <meta name="vs_defaultClientScript" content="JavaScript">
        <meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5">
    </HEAD>
    <body>
        <form id="Form1" method="post" runat="server">
            <FONT face="宋体"></FONT>
        </form>
    </body>
</HTML>