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1using System;
2using Sy***m.Data;
3using Sy***m.Configuration;
4using Sy***m.Web;
5using Sy***m.Web.Security;
6using Sy***m.Web.UI;
7using Sy***m.Web.UI.WebControls;
8using Sy***m.Web.UI.WebControls.WebParts;
9using Sy***m.Web.UI.HtmlControls;
10using Sy***m.Drawing;
11namespace WebHelper
12{
13
14 /**////
15 /// ImageHelper 的摘要说明
16 ///
17 public class ImageHelper
18 {
19 public ImageHelper()
20 {
21 //
22 // TODO: 在此处添加构造函数逻辑
23 //
24 }
25 Image水印#region Image水印
26 /**////
27 /// 写入图像水印
28 ///
29 /// 水印字符串
30 /// 原图片位置
31 /// 水印加入后的位置
32 ///
33 public string CreateBackImage(Sy***m.Web.UI.Page pageCurrent, string str, string filePath, string savePath, int x, int y)
34 {
35 Sy***m.Drawing.Image img = Sy***m.Drawing.Image.FromFile(pa***urrent.MapPath(filePath));
36 //创建图片
37 Graphics graphics = Gr***ics.FromImage(img);
38 //指定要绘制的面积
39 gr***ics.DrawImage(img, 0, 0, im***idth, im***eight);
40 //定义字段和画笔
41 Font font = new Font("黑体", 16);
42 Brush brush = new SolidBrush(Co***.Yellow);
43 gr***ics.DrawString(str, font, brush, x, y);
44 //保存并输出图片
45 img.Save(pa***urrent.MapPath(savePath), Sy***m.Drawing.Imaging.ImageFormat.Jpeg);
46 return savePath;
47
48 }
49 #endregion
50 Image自动缩小#region Image自动缩小
51 /**////
52 /// 缩小图片到指定的大小
53 ///
54 ///
55 /// 原图片的位置
56 ///
57 ///
58 /// 缩小后的图片位置
59 ///
60 ///
61 /// 宽度
62 ///
63 ///
64 /// 高度
65 ///
66 public void SmallPic(string strOldPic, string strNewPic, int intWidth, int intHeight)
67 {
68
69 Sy***m.Drawing.Bitmap objPic, objNewPic;
70 try
71 {
72 objPic = new Sy***m.Drawing.Bitmap(strOldPic);
73 objNewPic = new Sy***m.Drawing.Bitmap(objPic, intWidth, intHeight);
74 ob***wPic.Save(strNewPic);
75
76 }
77 catch (Exception exp) { throw exp; }
78 finally
79 {
80 objPic = null;
81 objNewPic = null;
82 }
83 }
84
85 public void SmallPic(string strOldPic, string strNewPic, int intWidth)
86 {
87
88 Sy***m.Drawing.Bitmap objPic, objNewPic;
89 try
90 {
91 objPic = new Sy***m.Drawing.Bitmap(strOldPic);
92 int intHeight = Co***rt.ToInt32(((intWidth * 1.0) / (ob***c.Width * 1.0)) * ob***c.Height);
93 objNewPic = new Sy***m.Drawing.Bitmap(objPic, intWidth, intHeight);
94 ob***wPic.Save(strNewPic, ob***c.RawFormat);
95
96 }
97 catch (Exception exp) { throw exp; }
98 finally
99 {
100 objPic = null;
101 objNewPic = null;
102 }
103 }
104
105 //public void SmallPic(string strOldPic, string strNewPic, int intHeight)
106 //{
107
108 // Sy***m.Drawing.Bitmap objPic, objNewPic;
109 // try
110 // {
111 // objPic = new Sy***m.Drawing.Bitmap(strOldPic);
112 // int intWidth = Co***rt.ToInt32(((intHeight * 1.0) / ob***c.Height) * ob***c.Width);
113 // objNewPic = new Sy***m.Drawing.Bitmap(objPic, intWidth, intHeight);
114 // ob***wPic.Save(strNewPic, ob***c.RawFormat);
115
116 // }
117 // catch (Exception exp) { throw exp; }
118 // finally
119 // {
120 // objPic = null;
121 // objNewPic = null;
122 // }
123 //}
124 #endregion
125
126 }
127}
http://www.cnblogs.com/chu888chu888/archive/2007/01/09/615803.html
