[C#(WebForm)] 生成业务数据图(柱状和饼状图)

来源：http://student.csdn.net/space.php?uid=39735&do=blog&id=891

using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;

using System.Drawing;

namespace WebApplication1
{
 publicpartialclass _Default : System.Web.UI.Page
 {
 privatestring[,] data =newstring[6, 2];

 protectedvoid Page_Load(object sender, EventArgs e)
 {
 DrawingAPic();
 }

 privatevoid DrawingAPic()
 {
 int i;
 // 实例化Bitmap对象
 Bitmap objbitmap;
 objbitmap =new Bitmap(400, 300);
 Graphics objGraphics;

 // 实例化Graphics类
 objGraphics = Graphics.FromImage(objbitmap);

 // 填充背景色 
 objGraphics.Clear(Color.White);

 // 画圆
 objGraphics.DrawRectangle(Pens.Black, 1, 1, 398, 298);

 // 写标题
 objGraphics.DrawString("本公司上半年营业额统计图", new Font("宋体", 16, FontStyle.Bold), Brushes.Black, new PointF(60, 5));

 // 获取数据，这里模拟出6个月的公司业务数据，实际应用可以从数据库读取
 getdata();

 PointF monthcolor =new PointF(260, 40);
 PointF fontinfor =new PointF(285, 36);

 for (i =0; i <=5; i++)
 {
 // 画出填充矩形
 objGraphics.FillRectangle(new SolidBrush(getcolor(i)), monthcolor.X, monthcolor.Y, 20, 10);

 //画出矩形边框。
 objGraphics.DrawRectangle(Pens.Black, monthcolor.X, monthcolor.Y, 20, 10);

 //画出图例说明文字－－data(i, 0)
 objGraphics.DrawString(data[i, 0], new Font("宋体", 10), Brushes.Black, fontinfor);

 //移动坐标位置，只移动Y方向的值即可。
 monthcolor.Y +=15;
 fontinfor.Y +=15;
 }

 // 遍历数据源的每一项数据，并根据数据的大小画出矩形图（即柱形图的柱）。
for (i =0; i <=5; i++)
 {
 //画出填充矩形。
 objGraphics.FillRectangle(new SolidBrush(getcolor(i)), (i *25) +35, 270- System.Convert.ToInt32(data[i, 1]), 15, System.Convert.ToInt32(data[i, 1]));

 //'画出矩形边框线。
 objGraphics.DrawRectangle(Pens.Black, (i *25) +35, 270- System.Convert.ToInt32(data[i, 1]), 15, System.Convert.ToInt32(data[i, 1]));
 }

 //画出示意坐标
 objGraphics.DrawLine(new Pen(Color.Blue, 1), 10, 0, 10, 320);
 objGraphics.DrawLine(new Pen(Color.Blue, 1), 10, 270, 200, 270);

 // 在示意坐标上添加数值标志，注意坐标的计算
for (i =0; i <=5; i++)
 {
 objGraphics.DrawLine(new Pen(Color.Blue, 1), 10, i *50+20, 20, i *50+20);
 objGraphics.DrawString((250- i *50).ToString(), new Font("宋体", 10), Brushes.Black, 12, i *50+8);
 }
 //统计总销售额
float scount =0;
 for (i =0; i <=5; i++)
 {
 scount +=float.Parse((data[i, 1]));
 }

 //定义画出扇形角度变量
float scg =0;
 float stg =0;
 for (i =0; i <=5; i++)
 {
 //计算当前角度值：当月销售额 / 总销售额 * 360，得到饼图中当月所占的角度大小。
float num =float.Parse(data[i, 1]);
 scg = (num / scount) *360;

 //画出填充圆弧。
 objGraphics.FillPie(new SolidBrush(getcolor(i)), 220, 150, 120, 120, stg, scg);

 //画出圆弧线。
 objGraphics.DrawPie(Pens.Black, 220, 150, 120, 120, stg, scg);

 // 把当前圆弧角度加到总角度上。
 stg += scg;
 }

 // 画出说明文字
 objGraphics.DrawString("柱状图", new Font("宋体", 15, FontStyle.Bold), Brushes.Blue, 50, 272);
 objGraphics.DrawString("饼状图", new Font("宋体", 15, FontStyle.Bold), Brushes.Blue, 250, 272);

 // 输出到客户端
 objbitmap.Save(Response.OutputStream, System.Drawing.Imaging.ImageFormat.Gif);

 }
 // 为数组赋值
 // 即生成模拟业务数据
privatevoid getdata()
 {
 data[0, 0] ="一月份";
 data[1, 0] ="二月份";
 data[2, 0] ="三月份";
 data[3, 0] ="四月份";
 data[4, 0] ="五月份";
 data[5, 0] ="六月份";
 data[0, 1] ="85";
 data[1, 1] ="135";
 data[2, 1] ="85";
 data[3, 1] ="110";
 data[4, 1] ="130";
 data[5, 1] ="200";
 }

 // 产生色彩值，便于显示区别
private Color getcolor(int i)
 {
 Color newcolor;
 i +=1;
 if (i ==1)
 {
 newcolor = Color.Blue;
 }
 elseif (i ==2)
 {
 newcolor = Color.ForestGreen;
 }
 elseif (i ==3)
 {
 newcolor = Color.Gainsboro;
 }
 elseif (i ==4)
 {
 newcolor = Color.Moccasin;
 }
 elseif (i ==5)
 {
 newcolor = Color.Indigo;
 }
 elseif (i ==6)
 {
 newcolor = Color.BurlyWood;
 }
 else
 newcolor = Color.Goldenrod;
 return newcolor;
 }
 }
}