asp.net 绘制曲线图

2022-07-15 80酷酷网 80kuku.com

　　asp.net

asp.net 绘制曲线图首先定义DrawClass类

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

/**//// <summary>
/// DrawClass 的摘要说明
/// </summary>
public class DrawClass
...{
    public DrawClass()
    ...{
        //
        // TODO: 在此处添加构造函数逻辑
        //
    }

    public MemoryStream draw(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]["sendmum"]);
        }
        //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]["sendmum"]) / 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]["sendmum"].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);
        return stream;

}
}

然后在页面文件中调用输出

DrawClass dc = new DrawClass();
        OracleConnection conn = new OracleConnection(con);
        string sql = "select * from atest";
        OracleDataAdapter da = new OracleDataAdapter(sql, conn);
        DataSet ds = new DataSet();
        da.Fill(ds, "atest");
        MemoryStream ss=dc.draw(ds, 6);
        Response.ContentType = "image/jpeg";
        Response.BinaryWrite(ss.ToArray());
图片输出到page页面中也有另外一种方式

        FileStream fs = new FileStream("c:Curve.jpg", FileMode.Open, FileAccess.Read);
        byte[] mydata = new byte[fs.Length];
        int Length = Convert.ToInt32(fs.Length);
        fs.Read(mydata, 0, Length);
        fs.Close();
        this.Response.OutputStream.Write(mydata, 0, Length);
        this.Response.End();

这样就行了。