ASP.NET画柱状图和折线图
using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Drawing.Imaging;
using System.Drawing.Drawing2D;
namespace commonu
{
/**////
/// WebForm2 的摘要说明。
///
public class WebForm2 : System.Web.UI.Page
{
private void Page_Load(object sender, System.EventArgs e)
{
/**//*自写编码*/
int ImgWidth=600; //1.[总宽度] ***图宽度
int ImgHeight=300; //2.[总高度] ***图高度
int ItemNum=1; //3.[项目数量] ***图表划分的块
int ChildNum=6; //4.[块数] ***大块中划分的子项的数量
float ChildRate=0.6f; //5.[各块总占空间比率]
//int ChildSpace=15; //6.[各块间的间距]
int ChartLeft=80; //7.[图表左边距] ***图表距图的左边距离
int ChartRight=50; //8.[图表右边距] ***图表距图的右边距离
int ChartTop=50; //9.[图表顶边距] ***图表距图顶边距离
int ChartBottom=50; //10.[图表底边距] ***图表距图底边距离
int YMaxValue=5000; //11.[纵坐标标尺最大值] ***纵坐标标尺的最大值
int YItemNum=10; //12.[纵坐标标尺段数] ***纵坐标标尺的段数
int YTop=15; //13.[距纵轴顶端间隔]
int YStrStart=35; //14.[纵坐标标尺文字起始X坐标]
int XRight=15; //15.[距横轴右端间隔]
int XStrStart=20; //16.[横坐标标尺文字起始Y坐标]
//[图表总宽度]=[总宽度]-[图表左边距]-[图表右边距]-[距横轴右端间隔]
int chartwidth=ImgWidth-ChartLeft-ChartRight-XRight;
//[项目宽度]=[图表总宽度]/[项目数量]
int itemwidth=chartwidth/ItemNum;
//[各块总占空间比率的实际宽度]=[项目宽度]*[各块总占空间比率]
int factwidth=Convert.ToInt32(Math.Floor(itemwidth*ChildRate));
//[各块矩形宽度]=[各块总占空间比率的实际宽度]/[块数]
int rectanglewidth=factwidth/ChildNum;
//[各块间的间距]=([项目宽度]-[各块总占空间比率的实际宽度])/([块数]+1)
int childspace=Convert.ToInt32(Math.Floor((itemwidth-factwidth)/(ChildNum+1)));
Graphics objGps;//建立画板对象
Bitmap objBitMap = new Bitmap(ImgWidth,ImgHeight);//建立位图对象
objGps = Graphics.FromImage(objBitMap);//根据位图对象建立画板对象
objGps.Clear(Color.White);//设置画板对象的背景色
int[] arrValues={0,0,0,0,0,0};//数据数组
//arrValues[0]=500;
arrValues[0]=Convert.ToInt32(Math.Floor((ImgHeight-ChartBottom-ChartTop-YTop)*500/YMaxValue)); //处理显示数据，进行图表数值对应
arrValues[1]=Convert.ToInt32(Math.Floor((ImgHeight-ChartBottom-ChartTop-YTop)*700/YMaxValue));
arrValues[2]=Convert.ToInt32(Math.Floor((ImgHeight-ChartBottom-ChartTop-YTop)*900/YMaxValue));
arrValues[3]=Convert.ToInt32(Math.Floor((ImgHeight-ChartBottom-ChartTop-YTop)*1000/YMaxValue));
arrValues[4]=Convert.ToInt32(Math.Floor((ImgHeight-ChartBottom-ChartTop-YTop)*1400/YMaxValue));
arrValues[5]=Convert.ToInt32(Math.Floor((ImgHeight-ChartBottom-ChartTop-YTop)*2200/YMaxValue));
string[] arrValueNames={"0","0","0","0","0","0","0","0","0","0"};//月份
arrValueNames[0] = "一月";
arrValueNames[1]="二月";
arrValueNames[2] = "三月";
arrValueNames[3]="四月";
arrValueNames[4]="五月";
arrValueNames[5]="六月";
arrValueNames[6] = "七月";
arrValueNames[7]="八月";
arrValueNames[8]="九月";
arrValueNames[9]="十月";
//得出矩形宽度，和画图X轴位置
//[项目宽度]=[总宽度]/[项目数量]
//======[各块总占空间比率]=（[各块矩形宽度]+[各块间的间距]）/[项目宽度]
//[各块总占空间比率的实际宽度]=[项目宽度]*[各块总占空间比率]
//[各块矩形宽度]=（[各块总占空间比率的实际宽度]-[各块间的间距]*（[块数]））/[块数]
//[一边空余空间宽度]=（[项目宽度]-[各块所占空间比率的总宽度]）/2
System.Drawing.Point[] pi=new Point[arrValues.Length]; //定义折线点的对象数组
System.Drawing.Point[] pit=new Point[3]; //定义坐标三角点的对象数组
System.Drawing.Pen pe=new Pen(new SolidBrush(GetColor(7)),1f); //定义画直线的对象
//画纵轴
objGps.DrawLine(pe,new Point(ChartLeft,ImgHeight-ChartBottom),new Point(ChartLeft,ChartTop));
//画纵轴终点箭头
pit[0].X=ImgWidth-ChartRight; //确定三角形三点的位置
pit[0].Y=ImgHeight-ChartBottom-4;
pit[1].X=ImgWidth-ChartRight;
pit[1].Y=ImgHeight-ChartBottom+4;
pit[2].X=ImgWidth-ChartRight+10;
pit[2].Y=ImgHeight-ChartBottom;
objGps.FillPolygon(new SolidBrush(GetColor(7)),pit);
//画纵轴标尺和标尺描述
for(int i=1;i<=YItemNum;i++)
{
//画标尺
objGps.DrawLine(pe,new PointF(ChartLeft,ImgHeight-ChartBottom-(ImgHeight-ChartBottom-ChartTop-YTop)/YItemNum*i),new PointF(ChartLeft-5,ImgHeight-ChartBottom-(ImgHeight-ChartBottom-ChartTop-YTop)/YItemNum*i));
//画描述
objGps.DrawString(arrValueNames[i-1].ToString(),new Font("宋体",10),Brushes.Black,new Point(YStrStart,ImgHeight-ChartBottom-(ImgHeight-ChartBottom-ChartTop-YTop)/YItemNum*i-5));
}
//画横轴
objGps.DrawLine(pe,new Point(ChartLeft,ImgHeight-ChartBottom),new Point(ImgWidth-ChartRight,ImgHeight-ChartBottom));
//画横轴终点箭头
pit[0].X=ChartLeft-4; //确定三角形三点的位置
pit[0].Y=ChartTop;
pit[1].X=ChartLeft+4;
pit[1].Y=ChartTop;
pit[2].X=ChartLeft;
pit[2].Y=ChartTop-10;
objGps.FillPolygon(new SolidBrush(GetColor(7)),pit);
//画横轴标尺和标尺描述
for(int i=1;i<=ItemNum;i++)
{
objGps.DrawLine(pe,new PointF(ChartLeft+itemwidth*i,ImgHeight-ChartBottom),new PointF(ChartLeft+itemwidth*i,ImgHeight-ChartBottom+5));
objGps.DrawString(arrValueNames[i-1].ToString(),new Font("宋体",10),Brushes.Black,new Point(ChartLeft+childspace+itemwidth*(i-1),ImgHeight-ChartBottom+XStrStart));
}
for(int j = 0;j<arrValues.Length;j++)//画矩形图和折线图
{
objGps.FillRectangle(new SolidBrush(GetColor(j)),(j*(childspace+rectanglewidth))+childspace+ChartLeft,ImgHeight-ChartBottom-arrValues[j],rectanglewidth,arrValues[j]);
objGps.DrawRectangle(Pens.Black,(j*(childspace+rectanglewidth))+childspace+ChartLeft,ImgHeight-ChartBottom-arrValues[j],rectanglewidth,arrValues[j]);
pi[j].X=(j*(childspace+rectanglewidth))+childspace+ChartLeft;
pi[j].Y=ImgHeight-ChartBottom-arrValues[j];
pe.SetLineCap(System.Drawing.Drawing2D.LineCap.RoundAnchor,System.Drawing.Drawing2D.LineCap.RoundAnchor,System.Drawing.Drawing2D.DashCap.Round);
if(j>0)
{
objGps.DrawLine(pe,pi[j-1],pi[j]);
}
}
objBitMap.Save(Response.OutputStream,ImageFormat.Gif);//该位图对象以"GIF"格式输出
}
/**//// 系统定义的颜色，有效值0到7，分别为（Blue，Yellow，Red，Orange，Purple，Brown，Pink，Black）
///
public static Color GetColor(int itemIndex)
{
Color objColor = new Color();
switch(itemIndex)
{
case 0:
objColor = Color.Blue;
break;
case 1:
objColor = Color.Yellow;
break;
case 2:
objColor = Color.Red;
break;
case 3:
objColor = Color.Orange;
break;
case 4:
objColor = Color.Purple;
break;
case 5:
objColor = Color.Brown;
break;
case 6:
objColor = Color.Pink;
break;
default:
objColor = Color.Black;
break;
}
return objColor;
}
/**//// 自定义颜色红色分量值，有效值0到255
/// 自定义颜色绿色分量值，有效值0到255
/// 自定义颜色蓝色分量值，有效值0到255
///
public static Color GetColor(int red,int green,int blue)
{
Color objColor = new Color();
objColor = Color.FromArgb(red,green,blue);
return objColor;
}
