chart.cs
using System;
using System.Drawing;
namespace Report
{
/// <summary>
/// Chart 的摘要說明。
/// ==================================================================================================
///
/// ClassName ：Report.Chart
/// Intro ：
/// Example ：
/// Ver ：0.2
///
/// Author ：ttyp
/// Email ：[email protected]
/// 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);
//清空圖片背景色
g.Clear(Color.White);
//虛線畫筆
Pen dot = new Pen(this.GridColor);
dot.DashStyle = System.Drawing.Drawing2D.DashStyle.Dot;
//實線畫筆
Pen solid = new Pen(this.BorderColor);
//文字字體
Font font = this.Font;
try
{
//冗余，去除最後的數據分割標記，防止空數據
if(this.Data.EndsWith(";"))
{
this.Data = this.Data.Substring(0,this.Data.Length-1);
}
string[] info = this.Data.Split(';'); //數據信息
if(info.Length>=2)
{
string[] lines = info[0].Split(','); //圖例
string[] units = info[1].Split(','); //單位和標題格式，a,b,c,d a 縱坐標單位 b 縱坐標格式 N 數字 D 時間 後面是具體格式，c 橫坐標單位 d 橫坐標格式（同b）
//曲線顏色表
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};
//圖例文字的大小
SizeF sFont = GetMaxSize(lines,g,font);
//獲得刻度文字高度
int textHeight = (int)(sFont.Height*3/2);
//曲線點的個數
int points = info.Length-2;
//得到曲線點數組集合
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"; //非數據，不畫線
}
}
}
//獲得最大，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;
}
}
}
//獲取坐標框的上下左右
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;
//獲取曲線框的寬度和高度（比坐標框略小）
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;
//---------------------------------------------------------------------------------
//獲取最大行
int maxrow = (int)(yWidth/(sFont.Height/2*3));
maxrow = Math.Max(maxrow,1);
//獲取Y步進值
float stepYv = (float)((maxY-minY)/(maxrow));
if(units[1].Length>1)
{
//整數分割，調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);
//---------------------------------------------------------------------------------
//得到最大的網格列（最多10列）
int maxcol = points;
maxcol = Math.Min(points,maxcol);
maxcol = Math.Max(maxcol,1);
//獲取X步進值
float stepXv = (float)((maxX-minX)/(maxcol));
if(units[3].Length>1)
{
//整數分割，調整最大和最小值，以及步進
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);
}
}
//獲得最大顯示列數
int dispcol = (int)((xWidth)/(GetMaxSize(units[3].Substring(1),g,font).Width+padding));
dispcol = Math.Max(dispcol,1);
//如果最大顯示列小於最大列，則應該縮減
if(dispcol<maxcol)
{
stepXv = (float)Math.Ceiling((maxX-minX)/dispcol);
maxcol = (int)((maxX-minX)/stepXv);
}
float stepx = (float)((xWidth/(maxX-minX))*stepXv);
//獲得最大的曲線數目
int maxline = color.Length;
maxline = Math.Min(maxline,lines.Length);
//畫圖例邊框
g.DrawRectangle(solid, padding, (height-((sFont.Height+5)*maxline+2*padding))/2,padding*2+sFont.Height+2 + sFont.Width, (sFont.Height+5)*maxline+2*padding);
//畫圖例
for(int i=0;i<maxline;i++)
{
SolidBrush fb = new SolidBrush(color[i]);
SolidBrush bl = new SolidBrush(Color.Black);
//畫圖例方框
g.FillRectangle(fb,padding*2, (height-((sFont.Height+5)*maxline+2*padding))/2+(sFont.Height+5)*i+padding,sFont.Height, sFont.Height);
//畫圖例文字
g.DrawString(lines[i], font, bl, padding*2+sFont.Height+2,(height-((sFont.Height+5)*maxline+2*padding))/2+(sFont.Height+5)*i+padding);
}
//畫坐標
g.DrawLine(solid,left,top,left,bottom); //Y
g.DrawLine(solid,left,bottom,right,bottom); //X
//畫坐標箭頭
g.DrawLine(solid,left,top,left-padding/3,top+padding/2); //Y箭頭
g.DrawLine(solid,left,top,left+padding/3,top+padding/2);
g.DrawLine(solid,right,bottom,right-padding/2,bottom-padding/3); //X箭頭
g.DrawLine(solid,right,bottom,right-padding/2,bottom+padding/3);
//畫X刻度
for(int i=0;i<=maxcol;i++)
{
SolidBrush bl = new SolidBrush(Color.Black);
if(i>0)
{
g.DrawLine(dot,left+i*stepx,top+padding,left+i*stepx,bottom);
}
string text = "";
switch(units[3].Substring(0,1).ToString())
{
case "N":
text = (minX+stepXv*i).ToString(units[3].Substring(1));
break;
case "D":
text = DateTime.FromOADate((int)(minX+stepXv*i)).ToString(units[3].Substring(1));
break;
}
SizeF xf = GetMaxSize(text,g,font);
g.DrawString(text, font, bl, left+i*stepx-xf.Width/2,bottom+xf.Height/2);
if(i==0)
{
g.DrawString(units[2], font, bl, right-GetMaxSize(units[2],g,font).Width,bottom);
}
if(points<=1)
{
break;
}
}
//畫Y刻度
for(int i=0;i<=maxrow;i++)
{
SolidBrush bl = new SolidBrush(Color.Black);
if(i>0)
{
g.DrawLine(dot,left,bottom-i*stepy,right-padding,bottom-i*stepy);
}
string text = "";
switch(units[1].Substring(0,1).ToString())
{
case "N":
text = (minY+i*stepYv).ToString(units[1].Substring(1));
break;
case "D":
text = DateTime.FromOADate(int.Parse(curve[i,0])).ToString(units[1].Substring(1));
break;
}
SizeF xf = GetMaxSize(text,g,font);
g.DrawString(text, font, bl, left-xf.Width,bottom-stepy*i-xf.Height/2);
if(i==0)
{
g.DrawString(units[0], font, bl, left-GetMaxSize(units[0],g,font).Width-3,top);
}
}
//畫圖片的邊框線
g.DrawRectangle(solid, 0, 0, image.Width - 1, image.Height - 1);
float[] px = new float[maxline];
float[] py = new float[maxline];
bool[] ps = new bool[maxline];
//畫曲線
for(int j=0;j<points;j++)
{
float v = float.Parse(curve[j,0]);
float cx = (float)(left+(xWidth)*(v-minX)/(maxX-minX));
for(int i=0;i<maxline;i++)
{
try
{
float w = float.Parse(curve[j,i+1]);
float cy = (float)(bottom - (yWidth)*(w-minY)/(maxY-minY));
if(ps[i])
{
Pen cp = new Pen(color[i]);
g.DrawLine(cp,px[i],py[i],cx,cy);
}
px[i] = cx;
py[i] = cy;
ps[i] = true;
if(points==1)
{
image.SetPixel((int)cx,(int)cy,color[i]);
}
}
catch
{
ps[i] = false;
}
}
}
}
else
{
string msg = "no data";
g.DrawString(msg,font,new SolidBrush(Color.Black), (width - GetMaxSize(msg,g,font).Width)/2,(height-GetMaxSize(msg,g,font).Height)/2);
}
System.Web.HttpContext.Current.Response.ClearContent();
System.Web.HttpContext.Current.Response.ContentType="image/Gif";
image.Save(System.Web.HttpContext.Current.Response.OutputStream,System.Drawing.Imaging.ImageFormat.Gif);
}
finally
{
g.Dispose();
image.Dispose();
}
}
private SizeF GetMaxSize(string[] s,Graphics g,Font f)
{
string max = "";
for(int i=0;i<s.Length;i++)
{
if(s[i].Length>max.Length)
{
max = s[i];
}
}
return g.MeasureString(max,f);
}
private SizeF GetMaxSize(string s,Graphics g,Font f)
{
return g.MeasureString(s,f);
}
private void GetMaxMin(string[,] data,out double maxY,out double minY,out double maxX,out double minX)
{
int row = 0;
int col = 0;
double m =double.MinValue,n=double.MaxValue;
double p =double.MinValue,q=double.MaxValue;
row = data.GetLength(0);
col = data.GetLength(1);
for(int i=0;i<row;i++)
{
for(int j=0;j<col;j++)
{
double v = 0;
try
{
v = double.Parse(data[i,j]);
if(j>0)
{
if(v>m)
{
m = v;
}
if(v<n)
{
n = v;
}
}
else
{
if(v>p)
{
p = v;
}
if(v<q)
{
q = v;
}
}
}
catch{}
}
}
maxY = m;
minY = n;
maxX = p;
minX = q;
}
}
}
