asp.net 生成曲线图实现代码

  我的Dataset是从表Sendrec里读取的数据,分别有Id,Sendid(订单号),Sendtime(记录时间),Sendnum(单位时间发送量/我这里是五分钟)几个字段

  过程如下:

  public void draw(Page page,DataSet ds,int Tnum){}

  其中page是用来传递引用这个过程的页面,这样让页面是JPG方式直接向客户端输出生成的曲线图.

  ds就是取出来的数据集了

  Tnum只是我这里要用到的一个参数,不想让这个类去接触读取过程,所以把订单的总量直接取出后传递给它的.

  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)

  {

  //取得记录数量

  int count = ds.Tables[0].Rows.Count;

  //记算图表宽度

  int wd = 80 + 20 * (count - 1);

  //设置最小宽度为800

  if (wd < 800) wd = 800;

  //生成Bitmap对像

  Bitmap img=new Bitmap(wd,400);

  //生成绘图对像

  Graphics g = Graphics.FromImage(img);

  //定义黑色画笔

  Pen Bp = new Pen(Color.Black);

  //定义红色画笔

  Pen Rp = new Pen(Color.Red);

  //定义银灰色画笔

  Pen Sp = new Pen(Color.Silver);

  //定义大标题字体

  Font Bfont = new Font("Arial", 12, FontStyle.Bold);

  //定义一般字体

  Font font = new Font("Arial", 6);

  //定义大点的字体

  Font Tfont = new Font("Arial", 9);

  //绘制底色

  g.DrawRectangle(new Pen(Color.White, 400), 0, 0, img.Width, img.Height);

  //定义黑色过渡型笔刷

  LinearGradientBrush brush = new LinearGradientBrush(new Rectangle(0, 0,img.Width, img.Height), Color.Black, Color.Black, 1.2F, true);

  //定义蓝色过渡型笔刷

  LinearGradientBrush Bluebrush = new LinearGradientBrush(newRectangle(0, 0, img.Width, img.Height), Color.Blue, Color.Blue, 1.2F,true);

  //绘制大标题

  g.DrawString(ds.Tables[0].Rows[0]["sendid"].ToString() + "号订单发送情况曲线图", Bfont, brush, 40, 5);

  //取得当前发送量

  int nums=0;

  for (int i = 0; i < count; i++)

  {

  nums+=Convert.ToInt32(ds.Tables[0].Rows[i]["sendnum"]);

  }

  //绘制信息简报

  string info="订单发送时间:"+ds.Tables[0].Rows[0]["sendtime"].ToString()+" 曲线图生成时间:"+DateTime.Now.ToString()+" 订单总量:"+Tnum.ToString()+" 当前发送总量:"+nums.ToString();

  g.DrawString(info, Tfont, Bluebrush, 40, 25);

  //绘制图片边框

  g.DrawRectangle(Bp, 0, 0, img.Width - 1, img.Height - 1);

  //绘制竖坐标线

  for (int i = 0; i < count; i++)

  {

  g.DrawLine(Sp, 40+20 * i, 60, 40+20 * i, 360);

  }

  //绘制时间轴坐标标签

  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);

  }

  //绘制横坐标线

  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;

  //绘制发送量轴坐标标签

  g.DrawString(s.ToString(), font, brush, 10, 60 + 30 * i);

  }

  //绘制竖坐标轴

  g.DrawLine(Bp, 40, 55, 40, 360);

  //绘制横坐标轴

  g.DrawLine(Bp, 40, 360, 45 + 20 * (count - 1), 360);

  //定义曲线转折点

  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;

  }

  //绘制发送曲线

  g.DrawLines(Rp, p);

  for (int i = 0; i < count; i++)

  {

  //绘制发送记录点的发送量

  g.DrawString(ds.Tables[0].Rows[i]["sendnum"].ToString(), font, Bluebrush, p[i].X, p[i].Y - 10);

  //绘制发送记录点

  g.DrawRectangle(Rp, p[i].X - 1, p[i].Y - 1, 2, 2);

  }

  //绘制竖坐标标题

  g.DrawString("发送量", Tfont, brush, 5, 40);

  //绘制横坐标标题

  g.DrawString("发送时间", Tfont, brush, 40, 385);

  //保存绘制的图片

  MemoryStream stream = new MemoryStream();

  img.Save(stream, ImageFormat.Jpeg);

  //图片输出

  page.Response.Clear();

  page.Response.C;

  page.Response.BinaryWrite(stream.ToArray());

  }

  }