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【ttyp】ASP.NET图形化的曲线图类

上一篇 / 下一篇 2008-07-23 13:56:47 / 个人分类：.net

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,out maxY,out minY,out maxX,out minX);
                    //冗余最大最小值
                    if(maxY==minY)
                    {
                        if(maxY==0)
                        {
                            maxY = 10;
                            minY = -10;
                        }
                        else
                        {
                            if(maxY>0)
                            {
                                maxY = maxY*2;
                                minY = 0;
                            }
                            else
                            {
                                maxY = 0;
                                minY = maxY*2;
                            }
                        }
                    }

                    if(maxX==minX)
                    {
                        if(maxX==0)
                        {
                            maxX = 10;
                            minX = -10;
                        }
                        else
                        {
                            if(maxX>0)
                            {
                                maxX = maxX*2;
                                minY = 0;
                            }
                            else
                            {
                                maxX = 0;
                                minX = maxX*2;
                            }
                        }
                    }

                    //获取坐标框的上下左右
                    float left        = (padding*2+sFont.Height+2 + sFont.Width + padding+GetMaxSize(units[1],g,font).Width+padding);
                    float bottom    = height-padding-textHeight;
                    float top        = padding;
                    float right        = width -padding;

                    //获取曲线框的宽度和高度（比坐标框略小）
                    float yWidth = bottom-top-GetMaxSize(units[0],g,font).Height*3/2-padding;
                    float xWidth = right-left-GetMaxSize(units[3],g,font).Width/2 - sFont.Width -padding;

                    //---------------------------------------------------------------------------------

                    //获取最大行
                    int maxrow    = (int)(yWidth/(sFont.Height/2*3));
                    maxrow    = Math.Max(maxrow,1);

                    //获取Y步进值
                    float stepYv = (float)((maxY-minY)/(maxrow));

                    if(units[1].Length>1)
                    {
                        //整数分割，调整最大行和最大最小值
                        if(units[1].Substring(0,1).ToLower()=="d")
                        {
                            maxY    = Math.Ceiling(maxY);
                            minY    = Math.Floor(minY);
                            stepYv    = (float)Math.Ceiling((maxY-minY)/maxrow);
                            maxrow    = (int)((maxY-minY)/stepYv);
                        }
                    }

                    float stepy        = (float)((yWidth/(maxY-minY))*stepYv);


                    //---------------------------------------------------------------------------------

                    //得到最大的网格列（最多10列）
                    int maxcol    = points;
                    maxcol        = Math.Min(points,maxcol);
                    maxcol        = Math.Max(maxcol,1);

                    //获取X步进值
                    float stepXv = (float)((maxX-minX)/(maxcol));

                    if(units[3].Length>1)
                    {
                        //整数分割，调整最大和最小值，以及步进
                        if(units[3].Substring(0,1).ToLower()=="d")
                        {
                            maxX    = Math.Ceiling(maxX);
                            minX    = Math.Floor(minX);
                            stepXv    = (float)Math.Ceiling((maxX-minX)/maxcol);
                            maxcol    = (int)((maxX-minX)/stepXv);
                        }
                    }

                    //获得最大显示列数
                    int dispcol = (int)((xWidth)/(GetMaxSize(units[3].Substring(1),g,font).Width+padding));
                    dispcol = Math.Max(dispcol,1);

                    //如果最大显示列小于最大列，则应该缩减
                    if(dispcol<maxcol)
                    {
                        stepXv    = (float)Math.Ceiling((maxX-minX)/dispcol);
                        maxcol    = (int)((maxX-minX)/stepXv);
                    }

                    float stepx = (float)((xWidth/(maxX-minX))*stepXv);

                    //获得最大的曲线数目
                    int maxline    = color.Length;   &nbs