天志（六子）的曲线走势图

€下面是写的一个画曲线走势图的自定义控件Curve.ascx的源代码，放在这儿，以免忘记了。
画出的图片如下：

下面是代码：

/**//// <copyright>天志（六子）  1989-2006</copyright>
/// <version>1.0</version>
/// <author>天志</author>
/// <email></email>
/// <log date="2006-11-10">创建</log>

namespace MyBank.UI
{
    using System;
    using System.Data;
    using System.Drawing;
    using System.Drawing.Imaging;
    using System.Web;
    using System.Web.UI.WebControls;
    using System.Web.UI.HtmlControls;

    using DOTNET.Utils;

    using Data;
    using Business.Interface;

    /**//// <summary>
    ///    天志（六子）的曲线走势图。
    /// </summary>
    /// <author>天志</author>
    /// <log date="2006-11-10">创建</log>
    public class Curve : System.Web.UI.UserControl
    {

        private void Page_Load(object sender, System.EventArgs e)
        {
            // 绘制曲线走势图
            InitializeGraph();
        }

        /**//// <summary>
        /// 画图板的宽度。
        /// </summary>
        /// <author>天志</author>
        /// <log date="2006-11-10">创建</log>
        int Width 
        {
            get
            {
                return (5*widthNum) + 200;
            }
        }

        /**//// <summary>
        /// 画图板的高度。
        /// </summary>
        /// <author>天志</author>
        /// <log date="2006-11-10">创建</log>
        int Height = 520;

        /**//// <summary>
        /// 曲线图的节点数。
        /// </summary>
        /// <author>天志</author>
        /// <log date="2006-11-10">创建</log>
        int widthNum
        {
            get
            {
                return 164;
            }
        }

        /**//// <summary>
        /// 画图板中的纵轴刻度数。
        /// </summary>
        /// <author>天志</author>
        /// <log date="2006-11-10">创建</log>
        int heigthNum = 300;

        /**//// <summary>
        /// 绘制曲线走势图。
        /// </summary>
        /// <author>天志</author>
        /// <log date="2006-11-10">创建</log>
        private void InitializeGraph()
        {
            
            // 根据给定的高度和宽度创建一个位图图像
            Bitmap objBitmap = new Bitmap(Width, Height);

            // 从指定的 objBitmap 对象创建 objGraphics 对象 (即在objBitmap对象中画图)
            Graphics objGraphics = Graphics.FromImage(objBitmap);

            // 设置画图板边框颜色
            objGraphics.DrawRectangle
                (
                new Pen(Color.Green, 1),
                0,
                0,
                Width,
                Height
                );

            // 填充画图板
            objGraphics.FillRectangle
                (new SolidBrush(Color.LightSteelBlue),
                1,
                1,
                (Width - 2),
                (Height - 2)
                );

            // 在某一高度画一条横线
            objGraphics.DrawLine
                (
                new Pen(new SolidBrush(Color.Aqua), 1),
                100,
                (Height - 100),
                (Width - 75),
                (Height - 100)
                );

            // 在某一处画一条直立的直线
            objGraphics.DrawLine
                (
                new Pen(new SolidBrush(Color.Aqua), 1),
                100,
                (Height - 100),
                100,
                75);

            初始化轴线说明文字#region 初始化轴线说明文字

            string YAxisText = "曲线走势图的纵轴刻度";

            // 在指定的地方写指定的字符串
            objGraphics.DrawString
                (
                "曲线走势图的横轴刻度",
                new Font("宋体", 10),
                new SolidBrush(Color.Black),
                ((Width/2) - 50),
                (Height - 50));

            // 每间隔20个像素，写一个
            int X = 30;
            int Y = (Height/2) - 50;
            for(int i = 0; i < YAxisText.Length; i++)
            {
                objGraphics.DrawString
                    (
                    YAxisText[i].ToString(),
                    new Font("宋体",10),
                    new SolidBrush(Color.Black),
                    X,
                    Y
                    );
                Y += 15;
            }
            #endregion

            // 初始化X轴上的刻度和文字
            SetXAxis(ref objGraphics);

            // 初始化Y轴上的刻度和文字
            SetYAxis(ref objGraphics);

            // 初始化标题
            CreateTitle(ref objGraphics);

            DrawContent(ref objGraphics);

            // 将objGraphics对象以指定的图形格式（这里是Gif）保存到指定的Stream对象，并输出到客户端。 
            objBitmap.Save(HttpContext.Current.Response.OutputStream, ImageFormat.Gif);
            
        }

        

        /**//// <summary>
        /// 设置画图板横轴的刻度。
        /// </summary>
        /// <param name="objGraphics"></param>
        /// <author>天志</author>
        /// <log date="2006-11-10">创建</log>
        private  void SetXAxis(ref Graphics objGraphics)
        {
            int x1 = 100;
            int y1 = Height - 110;
            int x2 = 100;
            int y2 = Height - 90;

            // 判断是否为7的标记
            int iCount = 0;

            // 刻度尺的纵轴坐标点
            float Scale = 0;

            // 取得每个刻度的大小
            int iWidth = Width - 200;

            // 画出横轴开始点
            objGraphics.DrawString
                (
                "开始",
                new Font("宋体", 8),
                new SolidBrush(Color.Blue),
                85,
                (Height-90)
                );

            // 设置横轴的刻度
            for(int i = 0; i <= widthNum; i++)
            {
                // 如果横轴等于7（间隔一周），则画一个长刻度
                if(iCount == 7)
                {
                    // 画出刻度
                    objGraphics.DrawLine
                        (
                        new Pen(new SolidBrush(Color.Red)),
                        (x1 + Scale),
                        y1,
                        (x2 +Scale),
                        y2
                        );

                    // 画上刻度标记
                    objGraphics.DrawString
                        (
                        i.ToString(),
                        new Font("宋体", 8),
                        new SolidBrush(Color.Black),
                        (x1 + Scale - 15),
                        y2
                        );

                    iCount = 0;
                }
                else
                {
                    // 画一个短刻度
                    objGraphics.DrawLine
                        (
                        new Pen(new SolidBrush(Color.Red)),
                        (x1 + Scale),
                        (y1 + 5),
                        (x2 + Scale),
                        (y2 - 5)
                        );
                }
                
                iCount++;
                Scale += 5;
            }
        }    

        /**//// <summary>
        /// 设置画图板纵轴的刻度。
        /// </summary>
        /// <param name="objGraphics"></param>
        /// <author>天志</author>
        /// <log date="2006-11-10">创建</log>
        private void SetYAxis(ref Graphics objGraphics)
        {
            int x1 = 95; 
            int y1 = Height - 100;
            int x2 = 105;
            int y2 = Height - 100;
            int iCount = 1;
            float Scale = 0;            

            // 画出纵轴的开始点
            objGraphics.DrawString
                (
                "开始",
                new Font("宋体", 10),
                new SolidBrush(Color.Blue),
                60,
                (Height - 110)
                );

            for(int i = 0; i < heigthNum; i++)
            {
                // 如果纵轴等于10，则画一个长刻度
                if (iCount == 10)
                {
                    // 画出刻度
                    objGraphics.DrawLine
                        (
                        new Pen(new SolidBrush(Color.Red)),
                        (x1 - 5),
                        (y1 - Scale),
                        (x2 + 5),
                        (y2 - Scale)
                        );

                    iCount = 0;
                }
                else
                {                    
                    // 画出刻度
                    objGraphics.DrawLine
                        (
                        new Pen(new SolidBrush(Color.Red)),
                        (x1 + 5),
                        (y1-Scale),
                        (x2 - 5),
                        (y2 - Scale)
                        );

                    if (iCount == 1)
                    {                        
                        // 画上刻度标记
                        objGraphics.DrawString
                            (
                            Convert.ToString((i + "")),
                            new Font("宋体", 8),
                            new SolidBrush(Color.Black),
                            60,
                            (y1 - Scale)
                            );
                    }
                }
                iCount++;
                Scale += 1;
            }
        }

        

        /**//// <summary>
        /// 设置图片标题。
        /// </summary>
        /// <param name="objGraphics"></param>
        /// <author>天志</author>
        /// <log date="2006-11-10">创建</log>
        private void CreateTitle(ref Graphics objGraphics)
        {
            // 设置图片标题
            objGraphics.DrawString(
                "天志（六子）的曲线走势图",
                new Font("宋体",16),
                new SolidBrush(Color.Blue),
                new Point(5,5));
        }        

        /**//// <summary>
        /// 绘制曲线图。
        /// </summary>
        /// <param name="objGraphics"></param>
        /// <author>天志</author>
        /// <log date="2006-11-10">创建</log>
        private void DrawContent(ref Graphics objGraphics)
        {
            // 存储曲线上的节点数组
            float[] floatArr = new float[164];

            // 取得一个随机数 
            Random Seed = new Random();
　　　　    int randomNum = Seed.Next(1, 100);

            // 给节点数组赋值 
            for (int i = 0; i < 164; i++)
            {
                randomNum = Seed.Next(1, 10);
                floatArr[i] = (randomNum*10) + 150;
            }

            // 设置绘制画笔  
            Pen CurvePen = new Pen(Color.Red, 1);
            PointF[] CurvePointF = new PointF[widthNum];

            // 开始的画板横轴
            float keys = 0;

            // 节点纵轴位置
            float values = 0;

            // 开始的画板纵轴
            float Offset1 = Height - 100;

            for(int i = 0;i < widthNum; i++)
            {
                // 设置画板横轴位置
                keys = (5*i) + 100;

                // 取得节点纵轴位置
                values = Offset1 - floatArr[i];

                // 设置绘制节点
                CurvePointF[i] = new PointF(keys, values);
            }

            // 绘制曲线
            objGraphics.DrawCurve
                (
                CurvePen,
                CurvePointF,
                1.0F
                );
        }

        Web 窗体设计器生成的代码#region Web 窗体设计器生成的代码
        override protected void OnInit(EventArgs e)
        {
            //
            // CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。
            //
            InitializeComponent();
            base.OnInit(e);
        }
        
        /**//// <summary>
        ///        设计器支持所需的方法 - 不要使用代码编辑器
        ///        修改此方法的内容。
        /// </summary>
        private void InitializeComponent()
        {
            this.Load += new System.EventHandler(this.Page_Load);

        }
        #endregion
    }
}

本源代码参照种玉堂的《先发个绘制曲线图的：用ASP.NET with C# 绘制曲线图（Curve图） 》[URL：http://www.cnblogs.com/KenBlove/archive/2006/10/23/461082.html#537662]