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aspx1
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2008-02-22 16:17
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1#
ASP.NET的曲线图类
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; maxline = Math.Min(maxline,lines.Length);
//画图例边框 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);
//画图例
for(int i=0;i<maxline;i++) { SolidBrush fb =new SolidBrush(color); SolidBrush bl =new SolidBrush(Color.Black); //画图例方框 g.FillRectangle(fb,padding*2, (height-((sFont.Height+5)*maxline+2*padding))/2+(sFont.Height+5)*i+padding,sFont.Height, sFont.Height); //画图例文字 g.DrawString(lines, font, bl, padding*2+sFont.Height+2,(height-((sFont.Height+5)*maxline+2*padding))/2+(sFont.Height+5)*i+padding);
}
//画坐标 g.DrawLine(solid,left,top,left,bottom); //Y g.DrawLine(solid,left,bottom,right,bottom); //X
//画坐标箭头 g.DrawLine(solid,left,top,left-padding/3,top+padding/2); //Y箭头 g.DrawLine(solid,left,top,left+padding/3,top+padding/2);
g.DrawLine(solid,right,bottom,right-padding/2,bottom-padding/3); //X箭头 g.DrawLine(solid,right,bottom,right-padding/2,bottom+padding/3);
//画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; } }
//画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); } }
//画图片的边框线 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];
//画曲线
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) { Pen cp =new Pen(color); g.DrawLine(cp,px,py,cx,cy); }
px = cx; py = cy; ps =true;
if(points==1) { image.SetPixel((int)cx,(int)cy,color); } } catch { ps =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.Length>max.Length) { max = s; } }
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; } } }
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 =new Random();
System.Text.StringBuilder sb =new System.Text.StringBuilder();
sb.Append(data);
string[] b =new string[days];
for(int i=0;i<days;i++) { string[] a =new string[6];
a[0] = ((int)DateTime.Now.AddDays(-1*i).ToOADate()).ToString();
for(int j=1;j<6;j++) { System.Threading.Thread.Sleep(1);
a[j] = random.Next(100).ToString();
}
b =string.Join(",",a); }
sb.Append(string.Join(";",b));
data = sb.ToString();
Report.Chart chart =new Report.Chart();
chart.Data = data; chart.Width =800; chart.Height =200; chart.Padding =8; chart.Font =new System.Drawing.Font("楷体2312",8);
chart.Render();
}demo
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 aspx1 最后编辑于 2008-02-22 16:24:51
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