//---------------------------------------------------------------------------------
//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[i]);
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[i], 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[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;
}
}
}
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[i] =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