asp.net图表统计类

前段时间项目需要,写了一个简单的图标统计类.决定以后写点东西到Blog来.

 

using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.Drawing.Drawing2D;



namespace CrystalReportsDemo
...{
    /**//// <summary>
    /// createReport绘制图形报表-柱图。
    /// </summary>
    public class createReport
    ...{

        public createReport()
        ...{
            //
            // TODO: 在此处添加构造函数逻辑
            //
        }

        public Bitmap CreatePictureReport(string[] x,int[] y,string ReportName)
        ...{
            if(x.Length != y.Length)
            ...{
                throw new Exception("X和Y数目不一致");
            }
            int colNum=y.Length;
            int colScale=880/(colNum+1);


            Bitmap bmp = new Bitmap(900,700,PixelFormat.Format24bppRgb);
            Graphics dc = Graphics.FromImage(bmp);
            dc.FillRectangle(new SolidBrush(Color.White),0,0,900,700);

            Pen scalePen = new Pen(Color.Black,2);
            Pen gridPen = new Pen(Color.Black,1);
        

            dc.DrawLine(scalePen,20,680,880,680);
            dc.DrawLine(scalePen,20,680,20,20);

            dc.DrawLine(gridPen,20,20,880,20);
            dc.DrawLine(gridPen,880,20,880,680);

            Point drawPoint;
            int XPoint;
            int YHeight;
            if(colNum==0)
            ...{
                throw new Exception("无数据值,colNum值为0作为除数,抛出异常");
                    
            }
            int drawWidth=880/(4*colNum);
            //int drawWidth=580/(4*colNum+1);//4*colNum+1  确保colNum不为0.否则580/(4*0);的话会异常.0不能作为除数
            int maxNum=getMaxNum(y);
            Rectangle rct;
            Random rnd = new Random();
            int red,green,blue;

            for(int i=20;i<680;i=i+96)
            ...{
                dc.DrawLine(gridPen,20,i,880,i);
            }

            for(int i=0;i<colNum;i++)
            ...{
                red=rnd.Next(0,255);
                green=rnd.Next(0,255);
                blue=rnd.Next(0,255);
                SolidBrush brush=new SolidBrush(Color.FromArgb(red,green,blue));
                XPoint=20+((i+1)*colScale)-drawWidth;
                YHeight=y[i]*650/maxNum;
                drawPoint=new Point(XPoint,680-YHeight);
                rct=new Rectangle(drawPoint,new Size(drawWidth*2,YHeight));
                dc.FillRectangle(brush,rct);
                dc.DrawRectangle(gridPen,rct);
            
                //绘制X数值
                dc.DrawString(x[i],new Font("宋体",9),new SolidBrush(Color.OrangeRed),new PointF((float)(XPoint+drawWidth/2),680-YHeight/2));
                //绘制Y数值 
                dc.DrawString(y[i].ToString(), new Font("宋体", 9), new SolidBrush(Color.Black), new PointF((float)(XPoint + drawWidth / 2), 680 - YHeight-15)); 
            }
            
            
            dc.DrawString(ReportName,new Font("宋体",10),Brushes.Black,3,3);
            
            return bmp;

            }
        private int getMaxNum(int[] arr)
        ...{
            int max=arr[0];
            for(int i=1;i<arr.Length;i++)
            ...{
                if(arr[i]>max)
                ...{
                    max=arr[i];
                }

            }
            return max;
        
        }
    
    }
}

 调用这个类的方法.贴一下
createReport crpt= new createReport();
string[] x ={"1月","2月","3月"};

int[] y = {25,17,29};

Bitmap bmp = crpt.CreatePictureReport(x,y,"ReportTitle");
String fname="Bar.png";
bmp.Save(Server.MapPath(fname),ImageFormat.Png);
this.Image1.ImageUrl=fname;