這里是從Dataset里的數據生成曲線圖.
我的Dataset是從表Sendrec里讀取的數據,分別有Id,Sendid(訂單號),Sendtime(記錄時間),Sendnum(單位時間發送量/我這里是五分鐘)幾個字段

過程如下:
public void draw(Page page,DataSet ds,int Tnum){}
其中page是用來傳遞引用這個過程的頁面,這樣讓頁面是JPG方式直接向客戶端輸出生成的曲線圖.
ds就是取出來的數據集了
Tnum只是我這里要用到的一個參數,不想讓這個類去接觸讀取過程,所以把訂單的總量直接取出后傳遞給它的.
using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;

using System.Web.UI.HtmlControls;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;
using System.Drawing;
using System.IO;

public class imgdraw
{
    public imgdraw()
    {
       
    }
    public void draw(Page page,DataSet ds,int Tnum)
    {
        //取得記錄數量
        int count = ds.Tables[0].Rows.Count;
        //記算圖表寬度
        int wd = 80 + 20 * (count - 1);
        //設置最小寬度為800
        if (wd < 800) wd = 800;
        //生成Bitmap對像
        Bitmap img=new Bitmap(wd,400);
        //生成繪圖對像
        Graphics g = Graphics.FromImage(img);
        //定義黑色畫筆
        Pen Bp = new Pen(Color.Black);
        //定義紅色畫筆
        Pen Rp = new Pen(Color.Red);
        //定義銀灰色畫筆
        Pen Sp = new Pen(Color.Silver);
        //定義大標題字體
        Font Bfont = new Font("Arial", 12, FontStyle.Bold);
        //定義一般字體
        Font font = new Font("Arial", 6);
        //定義大點的字體
        Font Tfont = new Font("Arial", 9);
        //繪制底色
        g.DrawRectangle(new Pen(Color.White, 400), 0, 0, img.Width, img.Height);
        //定義黑色過渡型筆刷
        LinearGradientBrush brush = new LinearGradientBrush(new Rectangle(0, 0, img.Width, img.Height), Color.Black, Color.Black, 1.2F, true);
        //定義藍色過渡型筆刷
        LinearGradientBrush Bluebrush = new LinearGradientBrush(new Rectangle(0, 0, img.Width, img.Height), Color.Blue, Color.Blue, 1.2F, true);
        //繪制大標題
        g.DrawString(ds.Tables[0].Rows[0]["sendid"].ToString() + "號訂單發送情況曲線圖", Bfont, brush, 40, 5);
        //取得當前發送量
        int nums=0;
        for (int i = 0; i < count; i++)
        {
            nums+=Convert.ToInt32(ds.Tables[0].Rows[i]["sendnum"]);
        }
        //繪制信息簡報
        string info="訂單發送時間："+ds.Tables[0].Rows[0]["sendtime"].ToString()+"  曲線圖生成時間："+DateTime.Now.ToString()+"  訂單總量："+Tnum.ToString()+"  當前發送總量："+nums.ToString();
        g.DrawString(info, Tfont, Bluebrush, 40, 25);
        //繪制圖片邊框
        g.DrawRectangle(Bp, 0, 0, img.Width - 1, img.Height - 1);

        //繪制豎坐標線      
        for (int i = 0; i < count; i++)
        {
            g.DrawLine(Sp, 40+20 * i, 60, 40+20 * i, 360);
        }
        //繪制時間軸坐標標簽
        for (int i = 0; i < count; i+=2)
        {
            string st = Convert.ToDateTime(ds.Tables[0].Rows[i]["sendtime"]).ToString("hh:mm");
            g.DrawString(st, font, brush, 30 + 20 * i, 370);
        }
        //繪制橫坐標線
        for (int i = 0; i < 10; i++)
        {
            g.DrawLine(Sp, 40, 60+30*i, 40+20*(count-1), 60+30*i);
            int s = 2500 - 50 * i * 5;
            //繪制發送量軸坐標標簽
            g.DrawString(s.ToString(), font, brush, 10, 60 + 30 * i);
        }
       
        //繪制豎坐標軸
        g.DrawLine(Bp, 40, 55, 40, 360);
        //繪制橫坐標軸
        g.DrawLine(Bp, 40, 360, 45 + 20 * (count - 1), 360);

        //定義曲線轉折點
        Point[] p = new Point[count];
        for (int i = 0; i < count; i++)
        {
            p[i].X = 40 + 20 * i;
            p[i].Y = 360- Convert.ToInt32(ds.Tables[0].Rows[i]["sendnum"]) / 5*3/5;
        }
        //繪制發送曲線
        g.DrawLines(Rp, p);

        for (int i = 0; i < count; i++)
        {
            //繪制發送記錄點的發送量
            g.DrawString(ds.Tables[0].Rows[i]["sendnum"].ToString(), font, Bluebrush, p[i].X, p[i].Y - 10);
            //繪制發送記錄點
            g.DrawRectangle(Rp, p[i].X - 1, p[i].Y - 1, 2, 2);
        }
        //繪制豎坐標標題
        g.DrawString("發送量", Tfont, brush, 5, 40);
        //繪制橫坐標標題
        g.DrawString("發送時間", Tfont, brush, 40, 385);

        //保存繪制的圖片
        MemoryStream stream = new MemoryStream();
        img.Save(stream, ImageFormat.Jpeg);
        //圖片輸出
        page.Response.Clear();
        page.Response.ContentType = "image/jpeg";
        page.Response.BinaryWrite(stream.ToArray());

    }
}
嘿嘿!發表這個,就是一個圖片的繪制方法的記錄了.這里面還有很多不當之久,望指教.
http://m.survivalescaperooms.com/aowind/archive/2006/11/23/569536.html