chart.cs

using System;
using System.Drawing;namespace Report
{
    /// <summary>
    /// Chart 的摘要说明。
    /// ==================================================================================================
    /// 
    ///    ClassName  ：Report.Chart  
    ///    Intro      ：
    ///    Example    ：  
    ///    Ver        ：0.2
    ///     
    ///    Author     ：ttyp  
    ///    Email      ：ttyp@21cn.com  
    ///    Date       ：2007-7-30
    /// ==================================================================================================
    /// </summary>
    public class Chart
    {
        public Chart(){}private string    _data    = "";
        private int        _width    = 100;
        private int        _height    = 100;
        private int        _padding= 8;
        private Color    _grid_color        = Color.FromArgb(0x93,0xbe,0xe2);
        private Color    _border_color    = Color.FromArgb(0x93,0xbe,0xe2);
        private Font    _font            = new Font("Arial",8);public Font Font
        {
            get { return _font;}
            set { _font = value;}
        }public Color BorderColor
        {
            get { return _border_color;}
            set { _border_color = value;}
        }public Color GridColor
        {
            get { return _grid_color;}
            set { _grid_color = value;}
        }public int Padding
        {
            get { return _padding;}
            set { _padding = Math.Max(0,value);}
        }public int Width
        {
            get { return _width;}
            set { _width = Math.Max(0,value);}
        }public int Height
        {
            get { return _height;}
            set { _height = Math.Max(0,value);}
        }public string Data
        {
            get { return _data;}
            set { _data = value;}
        }public void Render()
        {
            int width        = this.Width;
            int height        = this.Height;
            int padding        = this.Padding;    
    
            
            System.Drawing.Bitmap image = new System.Drawing.Bitmap(width,height);    
            
            Graphics g = Graphics.FromImage(image);//清空图片背景色
            g.Clear(Color.White);//虚线画笔
            Pen dot                = new Pen(this.GridColor);
            dot.DashStyle    = System.Drawing.Drawing2D.DashStyle.Dot;//实线画笔
            Pen solid            = new Pen(this.BorderColor);//文字字体
            Font font            = this.Font;        
            try
            {                //冗余，去除最后的数据分割标记，防止空数据
                if(this.Data.EndsWith(";"))
                {
                    this.Data = this.Data.Substring(0,this.Data.Length-1);
                }string[] info = this.Data.Split(';');        //数据信息

                if(info.Length>=2)
                {
                string[] lines = info[0].Split(',');    //图例
                    string[] units = info[1].Split(',');    //单位和标题格式，a,b,c,d  a 纵坐标单位 b 纵坐标格式 N 数字 D 时间 后面是具体格式，c 横坐标单位 d 横坐标格式（同b）//曲线颜色表
                    Color[] color    = new Color[]{Color.Blue,Color.Green,Color.Red,Color.Gray,Color.Black,Color.Magenta,Color.Cyan,Color.Yellow,Color.DeepPink,Color.BurlyWood,Color.DarkRed,Color.Gold};//图例文字的大小
                    SizeF sFont            = GetMaxSize(lines,g,font);//获得刻度文字高度
                    int textHeight        = (int)(sFont.Height*3/2);//曲线点的个数
                    int points            = info.Length-2;//得到曲线点数组集合
                    string[,] curve = new string[info.Length-2,lines.Length+1];
                    for(int i=0;i<points;i++)
                    {
                        string[] l = info[i+2].Split(',');
                        int len = l.Length;
                                                
                        for(int j=0;j<=lines.Length;j++)
                        {
                            if(j<len)
                            {                        
                                curve[i,j] = l[j];
                            }
                            else
                            {
                                curve[i,j] = "N";            //非数据，不画线
                            }
                        }                
                    }        
        
                    //获得最大，最小值
                    double maxY,minY,maxX,minX;

                    GetMaxMin(curve,

使用方法

demo.cs

        private void Page_Load(object sender, System.EventArgs e)
        {string data = "Total,T1,T2,T3,T4;(kwh),N0.0,(day),Dyyyy-MM-dd;";int days = 50;
            DateTime start = DateTime.Now.AddDays(-1*days);

            System.Random random 

demo