1 using System;
2 using System.Collections.Generic;
3 using System.Linq;
4 using System.Text;
5
6 namespace MySystemManager.Utility
7 {
8 public class ImageTextAndPicter
9 {
10 /// <summary>
11 /// 生成缩略图
12 /// </summary>
13 /// <param name="originalImagePath">源图路径（物理路径）</param>
14 /// <param name="thumbnailPath">缩略图路径（物理路径）</param>
15 /// <param name="width">缩略图宽度</param>
16 /// <param name="height">缩略图高度</param>
17 /// <param name="mode">生成缩略图的方式</param>
18 public void MakeThumbnail(string originalImagePath, string thumbnailPath, int width, int height, string mode)
19 {
20 System.Drawing.Image originalImage = System.Drawing.Image.FromFile(originalImagePath);
21
22 int towidth = width;
23 int toheight = height;
24
25 int x = 0;
26 int y = 0;
27 int ow = originalImage.Width;
28 int oh = originalImage.Height;
29
30 switch (mode)
31 {
32 case "HW"://指定高宽缩放（可能变形）
33 break;
34 case "W"://指定宽，高按比例
35 toheight = originalImage.Height * width / originalImage.Width;
36 break;
37 case "H"://指定高，宽按比例
38 towidth = originalImage.Width * height / originalImage.Height;
39 break;
40 case "Cut"://指定高宽裁减（不变形）
41 if ((double)originalImage.Width / (double)originalImage.Height > (double)towidth / (double)toheight)
42 {
43 oh = originalImage.Height;
44 ow = originalImage.Height * towidth / toheight;
45 y = 0;
46 x = (originalImage.Width - ow) / 2;
47 }
48 else
49 {
50 ow = originalImage.Width;
51 oh = originalImage.Width * height / towidth;
52 x = 0;
53 y = (originalImage.Height - oh) / 2;
54 }
55 break;
56 default:
57 break;
58 }
59
60 //新建一个bmp图片
61 System.Drawing.Image bitmap = new System.Drawing.Bitmap(towidth, toheight);
62
63 //新建一个画板
64 System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bitmap);
65
66 //设置高质量插值法
67 g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
68
69 //设置高质量,低速度呈现平滑程度
70 g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
71
72 //清空画布并以透明背景色填充
73 g.Clear(System.Drawing.Color.Transparent);
74
75 //在指定位置并且按指定大小绘制原图片的指定部分
76 g.DrawImage(originalImage, new System.Drawing.Rectangle(0, 0, towidth, toheight),
77 new System.Drawing.Rectangle(x, y, ow, oh),
78 System.Drawing.GraphicsUnit.Pixel);
79
80 try
81 {
82 //以jpg格式保存缩略图
83 bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Jpeg);
84 }
85 catch (System.Exception e)
86 {
87 throw e;
88 }
89 finally
90 {
91 originalImage.Dispose();
92 bitmap.Dispose();
93 g.Dispose();
94 }
95 }
96 /// <summary>
97 /// 在图片上增加文字水印
98 /// </summary>
99 /// <param name="Path">原服务器图片路径</param>
100 /// <param name="Path_sy">生成的带文字水印的图片路径</param>
101 /// <param name="addText">文字水印内容</param>
102 public void AddWater(string Path, string Path_sy, string addText)
103 {
104
105 System.Drawing.Image image = System.Drawing.Image.FromFile(Path);
106 System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(image);
107 g.DrawImage(image, 0, 0, image.Width, image.Height);
108 System.Drawing.Font f = new System.Drawing.Font("Verdana", 20);//字体大小
109 System.Drawing.Brush b = new System.Drawing.SolidBrush(System.Drawing.Color.Green);
110 //位置定位
111 g.DrawString(addText, f, b, 15, 15);
112 g.Dispose();
113
114 image.Save(Path_sy);
115 image.Dispose();
116 }
117 /// <summary>
118 /// 在图片上生成图片水印
119 /// </summary>
120 /// <param name="Path">原服务器图片路径</param>
121 /// <param name="Path_syp">生成的带图片水印的图片路径</param>
122 /// <param name="Path_sypf">水印图片路径</param>
123 public void AddWaterPic(string Path, string Path_syp, string Path_sypf)
124 {
125 System.Drawing.Image image = System.Drawing.Image.FromFile(Path);
126 System.Drawing.Image copyImage = System.Drawing.Image.FromFile(Path_sypf);
127 System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(image);
128 g.DrawImage(copyImage, new System.Drawing.Rectangle(image.Width - copyImage.Width, image.Height - copyImage.Height, copyImage.Width, copyImage.Height), 0, 0, copyImage.Width, copyImage.Height, System.Drawing.GraphicsUnit.Pixel);
129 g.Dispose();
130
131 image.Save(Path_syp);
132 image.Dispose();
133 }
134
135 }
136 }
