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using System.Data;3
using System.Configuration;4
using System.Collections;5
using System.Web;6
using System.Web.Security;7
using System.Web.UI;8
using System.Web.UI.WebControls;9
using System.Web.UI.WebControls.WebParts;10
using System.Web.UI.HtmlControls;11
using System.Drawing;12
using System.IO;13

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public partial class WebForm3: System.Web.UI.Page15

{16
private string[,] data = new string[6, 2];17

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private void Page_Load(object sender, System.EventArgs e)19

{20
DrawingAPic();21
}22

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private void DrawingAPic()24

{25
int i;26
// 实例化Bitmap对象27
Bitmap objbitmap;28
objbitmap = new Bitmap(400, 300);29
Graphics objGraphics;30

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// 实例化Graphics类32
objGraphics = Graphics.FromImage(objbitmap);33

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// 填充背景色 35
objGraphics.Clear(Color.White);36

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// 画圆38
objGraphics.DrawRectangle(Pens.Black, 1, 1, 398, 298);39

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// 写标题41
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));42

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// 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44
getdata();45

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PointF monthcolor = new PointF(260, 40);47
PointF fontinfor = new PointF(285, 36);48

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for (i = 0; i <= 5; i++)50

{51
// 画出填充矩形52
objGraphics.FillRectangle(new SolidBrush(getcolor(i)), monthcolor.X, monthcolor.Y, 20, 10);53

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//画出矩形边框。55
objGraphics.DrawRectangle(Pens.Black, monthcolor.X, monthcolor.Y, 20, 10);56

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//画出图例说明文字--data(i, 0)58
objGraphics.DrawString(data[i, 0], new Font("宋体", 10), Brushes.Black, fontinfor);59

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//移动坐标位置,只移动Y方向的值即可。61
monthcolor.Y += 15;62
fontinfor.Y += 15;63
}64

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// 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)。66
for (i = 0; i <= 5; i++)67

{68
//画出填充矩形。69
objGraphics.FillRectangle(new SolidBrush(getcolor(i)), (i * 25) + 35, 270 - System.Convert.ToInt32(data[i, 1]), 15, System.Convert.ToInt32(data[i, 1]));70

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//'画出矩形边框线。72
objGraphics.DrawRectangle(Pens.Black, (i * 25) + 35, 270 - System.Convert.ToInt32(data[i, 1]), 15, System.Convert.ToInt32(data[i, 1]));73
}74

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//画出示意坐标76
objGraphics.DrawLine(new Pen(Color.Blue, 1), 10, 0, 10, 320);77
objGraphics.DrawLine(new Pen(Color.Blue, 1), 10, 270, 200, 270);78

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// 在示意坐标上添加数值标志,注意坐标的计算80
for (i = 0; i <= 5; i++)81

{82
objGraphics.DrawLine(new Pen(Color.Blue, 1), 10, i * 50 + 20, 20, i * 50 + 20);83
objGraphics.DrawString((250 - i * 50).ToString(), new Font("宋体", 10), Brushes.Black, 12, i * 50 + 8);84
}85
//统计总销售额86
float scount = 0;87
for (i = 0; i <= 5; i++)88

{89
scount += float.Parse((data[i, 1]));90
}91

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//定义画出扇形角度变量93
float scg = 0;94
float stg = 0;95
for (i = 0; i <= 5; i++)96

{97
//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。98
float num = float.Parse(data[i, 1]);99
scg = (num / scount) * 360;100

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//画出填充圆弧。102
objGraphics.FillPie(new SolidBrush(getcolor(i)), 220, 150, 120, 120, stg, scg);103

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//画出圆弧线。105
objGraphics.DrawPie(Pens.Black, 220, 150, 120, 120, stg, scg);106

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// 把当前圆弧角度加到总角度上。108
stg += scg;109
}110

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// 画出说明文字112
objGraphics.DrawString("柱状图", new Font("宋体", 15, FontStyle.Bold), Brushes.Blue, 50, 272);113
objGraphics.DrawString("饼状图", new Font("宋体", 15, FontStyle.Bold), Brushes.Blue, 250, 272);114

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// 输出到客户端116
objbitmap.Save(Response.OutputStream, System.Drawing.Imaging.ImageFormat.Gif);117

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}119
// 为数组赋值120
// 即生成模拟业务数据121
private void getdata()122

{123
data[0, 0] = "一月份";124
data[1, 0] = "二月份";125
data[2, 0] = "三月份";126
data[3, 0] = "四月份";127
data[4, 0] = "五月份";128
data[5, 0] = "六月份";129
data[0, 1] = "85";130
data[1, 1] = "135";131
data[2, 1] = "85";132
data[3, 1] = "110";133
data[4, 1] = "130";134
data[5, 1] = "200";135
}136

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// 产生色彩值,便于显示区别138
private Color getcolor(int i)139

{140
Color newcolor;141
i += 1;142
if (i == 1)143

{144
newcolor = Color.Blue;145
}146
else if (i == 2)147

{148
newcolor = Color.ForestGreen;149
}150
else if (i == 3)151

{152
newcolor = Color.Gainsboro;153
}154
else if (i == 4)155

{156
newcolor = Color.Moccasin;157
}158
else if (i == 5)159

{160
newcolor = Color.Indigo;161
}162
else if (i == 6)163

{164
newcolor = Color.BurlyWood;165
}166
else167
newcolor = Color.Goldenrod;168
return newcolor;169
}170
}171

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