之前的gdi+绘图,整理了一下,清晰了很多

柱状图

using System;
2

using System.IO;
3

using System.Data;
4

using System.Drawing;
5

using System.Drawing.Text;
6

using System.Drawing.Drawing2D;
7

using System.Drawing.Imaging;
8

namespace WanFangData.Chart
10

{
11

public class Bar
12

{
13

public void Render(string title, string subTitle, int width, int height, DataSet chartData, Stream target)
14

{
15

const int SIDE_LENGTH = 400;
16

const int CHART_TOP = 75;
17

const int CHART_HEIGHT = 200;
18

const int CHART_LEFT = 50;
19

const int CHART_WIDTH = 300;
20

DataTable dt = chartData.Tables[0];
21

//计算最高的点
23

float highPoint = 0;
24

foreach (DataRow dr in dt.Rows)
25

{
26

if (highPoint < Convert.ToSingle(dr[1]))
27

{
28

highPoint = Convert.ToSingle(dr[1]);
29

}
30

}
31

//建立一个Graphics对象实例
32

Bitmap bm = new Bitmap(width, height);
33

Graphics g = Graphics.FromImage(bm);
34

//设置条图图形和文字属性
35

g.ScaleTransform((Convert.ToSingle(width)) / SIDE_LENGTH, (Convert.ToSingle(height)) / SIDE_LENGTH);
36

g.SmoothingMode = SmoothingMode.Default;
37

g.TextRenderingHint = TextRenderingHint.AntiAlias;
38

//设定画布和边
40

g.Clear(Color.White);
41

g.DrawRectangle(Pens.Black, 0, 0, SIDE_LENGTH - 1, SIDE_LENGTH - 1);
42

//画大标题
43

g.DrawString(title, new Font("Tahoma", 24), Brushes.Black, new PointF(5, 5));
44

//画小标题
45

g.DrawString(subTitle, new Font("Tahoma", 14), Brushes.Black, new PointF(7, 35));
46

//画条形图
47

float barWidth = CHART_WIDTH / (dt.Rows.Count * 2);
48

PointF barOrigin = new PointF(CHART_LEFT + (barWidth / 2), 0);
49

float barHeight = dt.Rows.Count;
50

for (int i = 0; i < dt.Rows.Count; i++)
51

{
52

barHeight = Convert.ToSingle(dt.Rows[i][1]) * 200 / highPoint;
53

barOrigin.Y = CHART_TOP + CHART_HEIGHT - barHeight;
54

g.FillRectangle(new SolidBrush(Utils.GetChartItemColor(i)), barOrigin.X, barOrigin.Y, barWidth, barHeight);
55

barOrigin.X = barOrigin.X + (barWidth * 2);
56

}
57

//设置边
58

g.DrawLine(new Pen(Color.Black, 2), new Point(CHART_LEFT, CHART_TOP), new Point(CHART_LEFT, CHART_TOP + CHART_HEIGHT));
59

g.DrawLine(new Pen(Color.Black, 2), new Point(CHART_LEFT, CHART_TOP + CHART_HEIGHT), new Point(CHART_LEFT + CHART_WIDTH, CHART_TOP + CHART_HEIGHT));
60

//画图例框和文字
61

g.DrawRectangle(new Pen(Color.Black, 1), 200, 300, 199, 99);
62

g.DrawString("Legend", new Font("Tahoma", 12, FontStyle.Bold), Brushes.Black, new PointF(200, 300));
63

//画图例
65

PointF boxOrigin = new PointF(210, 330);
66

PointF textOrigin = new PointF(235, 326);
67

for (int i = 0; i < dt.Rows.Count; i++)
68

{
69

g.FillRectangle(new SolidBrush(Utils.GetChartItemColor(i)), boxOrigin.X, boxOrigin.Y, 20, 10);
70

g.DrawRectangle(Pens.Black, boxOrigin.X, boxOrigin.Y, 20, 10);
71

g.DrawString(dt.Rows[i][0].ToString() + " - " + dt.Rows[i][1].ToString(), new Font("Tahoma", 10), Brushes.Black, textOrigin);
72

boxOrigin.Y += 15;
73

textOrigin.Y += 15;
74

}
75

//输出图形
76

bm.Save(target, ImageFormat.Gif);
77

//资源回收
79

bm.Dispose();
80

g.Dispose();
81

}
82

}
83

}
84

饼状图

using System;
2

using System.IO;
3

using System.Data;
4

using System.Drawing;
5

using System.Drawing.Text;
6

using System.Drawing.Drawing2D;
7

using System.Drawing.Imaging;
8

namespace WanFangData.Chart
10

{
11

public class Pie
12

{
13

public void Render(string title, string subTitle, int width, int height, DataSet chartData, Stream target)
14

{
15

const int SIDE_LENGTH = 400;
16

const int PIE_DIAMETER = 200;
17

DataTable dt = chartData.Tables[0];
18

//通过输入参数，取得饼图中的总基数
20

float sumData = 0;
21

foreach (DataRow dr in dt.Rows)
22

{
23

sumData += Convert.ToSingle(dr[1]);
24

}
25

//产生一个image对象，并由此产生一个Graphics对象
26

Bitmap bm = new Bitmap(width, height);
27

Graphics g = Graphics.FromImage(bm);
28

//设置对象g的属性
29

g.ScaleTransform((Convert.ToSingle(width)) / SIDE_LENGTH, (Convert.ToSingle(height)) / SIDE_LENGTH);
30

g.SmoothingMode = SmoothingMode.Default;
31

g.TextRenderingHint = TextRenderingHint.AntiAlias;
32

//画布和边的设定
34

g.Clear(Color.White);
35

g.DrawRectangle(Pens.Black, 0, 0, SIDE_LENGTH - 1, SIDE_LENGTH - 1);
36

//画饼图标题
37

g.DrawString(title, new Font("Tahoma", 24), Brushes.Black, new PointF(5, 5));
38

//画饼图的图例
39

g.DrawString(subTitle, new Font("Tahoma", 14), Brushes.Black, new PointF(7, 35));
40

//画饼图
41

float curAngle = 0;
42

float totalAngle = 0;
43

for (int i = 0; i < dt.Rows.Count; i++)
44

{
45

curAngle = Convert.ToSingle(dt.Rows[i][1]) / sumData * 360;
46

g.FillPie(new SolidBrush(Utils.GetChartItemColor(i)), 100, 65, PIE_DIAMETER, PIE_DIAMETER, totalAngle, curAngle);
48

g.DrawPie(Pens.Black, 100, 65, PIE_DIAMETER, PIE_DIAMETER, totalAngle, curAngle);
49

totalAngle += curAngle;
50

}
51

//画图例框及其文字
52

g.DrawRectangle(Pens.Black, 200, 300, 199, 99);
53

g.DrawString("Legend", new Font("Tahoma", 12, FontStyle.Bold), Brushes.Black, new PointF(200, 300));
54

//画图例各项
56

PointF boxOrigin = new PointF(210, 330);
57

PointF textOrigin = new PointF(235, 326);
58

float percent = 0;
59

for (int i = 0; i < dt.Rows.Count; i++)
60

{
61

g.FillRectangle(new SolidBrush(Utils.GetChartItemColor(i)), boxOrigin.X, boxOrigin.Y, 20, 10);
62

g.DrawRectangle(Pens.Black, boxOrigin.X, boxOrigin.Y, 20, 10);
63

percent = Convert.ToSingle(dt.Rows[i][1]) / sumData * 100;
64

g.DrawString(dt.Rows[i][0].ToString() + " - " + dt.Rows[i][1].ToString() + " (" + percent.ToString("0") + "%)", new Font("Tahoma", 10), Brushes.Black, textOrigin);
65

boxOrigin.Y += 15;
66

textOrigin.Y += 15;
67

}
68

//通过Response.OutputStream，将图形的内容发送到浏览器
69

bm.Save(target, ImageFormat.Gif);
70

//回收资源
71

bm.Dispose();
72

g.Dispose();
73

}
74

}
75

}

工具

using System;
2

using System.Drawing;
3

namespace WanFangData.Chart
5

{
6

class Utils
7

{
8

public static Color GetChartItemColor(int itemIndex)
9

{
10

Color selectedColor;
11

switch (itemIndex)
12

{
13

case 0:
14

selectedColor = Color.Blue;
15

break;
16

case 1:
17

selectedColor = Color.Red;
18

break;
19

case 2:
20

selectedColor = Color.Yellow;
21

break;
22

case 3:
23

selectedColor = Color.Purple;
24

break;
25

default:
26

selectedColor = Color.Green;
27

break;
28

}
29

return selectedColor;
30

}
31

}
32

}

调用柱状图

using System;
2

using System.Data;
3

using WanFangData.Chart;
4

using WanFangData.Common;
5

namespace WanFangData.Web
7

{
8

public partial class CBar : WanFangData.Page.BasePage
9

{
10

protected void Page_Load(object sender, EventArgs e)
11

{
12

Bar p = new Bar();
13

p.Render("大标题", "小标题", 300, 300,WanFangData.Common.Database.ExecuteDataset(CommandType.Text, "select * from a"), Response.OutputStream);
14

}
15

}
16

}
17

调用饼状图

using System;
2

using System.Data;
3

using WanFangData.Chart;
4

using WanFangData.Common;
5

namespace WanFangData.Web
7

{
8

public partial class CPie : WanFangData.Page.BasePage
9

{
10

protected void Page_Load(object sender, EventArgs e)
11

{
12

Pie p = new Pie();
13

p.Render("大标题", "小标题", 400, 400, Database.ExecuteDataset(CommandType.Text, "select * from a"), Response.OutputStream);
14

}
15

}
16

}
17

DAL是使用的微软的DAAB

posted @ 2007-11-09 18:15 Scott Xu(南方小鬼) 阅读(311) 评论(1) 收藏举报

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之前的gdi+绘图,整理了一下,清晰了很多

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