会画折线图的进来瞅瞅啊

nvlixxzhong 2007-11-21 12:39:36



using System;

using System.Data;

using System.Configuration;

using System.Collections;

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;

using System.Drawing.Imaging;



public partial class Estate_ZheXianTu : System.Web.UI.Page

{

    protected void Page_Load(object sender, EventArgs e)

    {

        //存月

        string[] month = new string[6] { "2007.01", "2007.02", "2007.03", "2007.04", "2007.05", "2007.06" };

        float[] d = new float[6] { 7000, 7219, 7500, 11000, 7000, 7650 }; //图中的点的数据



        int Max_d2 = MaxNum(d); //点最大值

        



        //画图初始化

        System.Drawing.Bitmap bmap = new System.Drawing.Bitmap(325,265);

        Graphics gph = Graphics.FromImage(bmap);

        gph.Clear(Color.White);

        PointF cpt = new PointF(40, 200);//中心点



        //画x轴

        gph.DrawLine(Pens.Black, cpt.X, cpt.Y, cpt.Y+100, cpt.Y);

        gph.DrawString("月份", new Font("宋体", 12), Brushes.Black, new PointF(cpt.Y + 80, cpt.Y + 10));



        //画y轴

        gph.DrawLine(Pens.Black, cpt.X, cpt.Y, cpt.X, cpt.X);      

        gph.DrawString("单位(元)", new Font("宋体", 12), Brushes.Black, new PointF(0, 7));



        //画y轴刻度

        int r = (int)Math.Ceiling(Convert.ToDecimal(Max_d2 / 1000));

        for (int i = 1; i <= r + 1; i++)

        {            

            if (i <= 6)

            {

                gph.DrawString(Convert.ToString((r + 1) * 1000 - (6 - i) * 1000), new Font("宋体", 11), Brushes.Black, new PointF(cpt.X - 40, cpt.Y - (i - 1) * 30 - 5));

                gph.DrawLine(Pens.Black, cpt.X - 3, cpt.Y - (i - 1) * 30, cpt.X, cpt.Y - (i - 1) * 30);

            }

        }



        //画x轴项目

        for (int j = 1; j <= 6; j++)

        {           

            gph.DrawString(month[j - 1].Substring(5, 2), new Font("宋体", 11), Brushes.Black, new PointF(cpt.X + j * 40 - 5, cpt.Y + 5));



            //画点

            Pen pen2 = new Pen(Color.Orange, 6);

            gph.DrawEllipse(pen2, cpt.X + j * 40 - 1.5f, cpt.Y - d[j - 1], 3, 3);         

            string price = (d[j - 1]).ToString();

            gph.DrawString(price, new Font("宋体", 12), Brushes.Black, new PointF(cpt.X + j * 40 - 1.5f, 0));           

        }

        //输出到浏览器

        System.IO.MemoryStream ms = new System.IO.MemoryStream();

        bmap.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);

        Response.ClearContent();

        Response.ContentType = "image/Gif";

        Response.BinaryWrite(ms.ToArray());

        gph.Dispose();

        bmap.Dispose();

    }



    public int MinNum(float[] str)

    {

        int min = Int32.Parse(str[0].ToString());

        for (int i = 0; i < str.Length; i++)

        {

            if (min > Int32.Parse(str[i].ToString()))

            {

                min = Int32.Parse(str[i].ToString());

            }

        }

        return min;

    }

    public int MaxNum(float[] str)

    {

        int max = Int32.Parse(str[0].ToString());

        for (int i = 0; i < str.Length; i++)

        {

            if (max < Int32.Parse(str[i].ToString()))

            {

                max = Int32.Parse(str[i].ToString());

            }

        }

        return max;

    }

}