一个asp.net的生成曲线图的过程

摘自：/article/4743090.html



这里是从Dataset里的数据生成曲线图.

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(new Rectangle(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.ContentType = "image/jpeg";


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




}


}