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C#图片按比例缩放:
1 // 按比例缩放图片
2 public Image ZoomPicture(Image SourceImage, int TargetWidth, int TargetHeight)
3 {
4 int IntWidth; //新的图片宽
5 int IntHeight; //新的图片高
6 try
7 {
8 System.Drawing.Imaging.ImageFormat format = SourceImage.RawFormat;
9 System.Drawing.Bitmap SaveImage = new System.Drawing.Bitmap(TargetWidth, TargetHeight);
10 Graphics g = Graphics.FromImage(SaveImage);
11 g.Clear(Color.White);
12
13 //计算缩放图片的大小 http://www.cnblogs.com/roucheng/
14
15 if (SourceImage.Width > TargetWidth && SourceImage.Height <= TargetHeight)//宽度比目的图片宽度大,长度比目的图片长度小
16 {
17 IntWidth = TargetWidth;
18 IntHeight = (IntWidth * SourceImage.Height) / SourceImage.Width;
19 }
20 else if (SourceImage.Width <= TargetWidth && SourceImage.Height > TargetHeight)//宽度比目的图片宽度小,长度比目的图片长度大
21 {
22 IntHeight = TargetHeight;
23 IntWidth = (IntHeight * SourceImage.Width) / SourceImage.Height;
24 }
25 else if (SourceImage.Width <= TargetWidth && SourceImage.Height <= TargetHeight) //长宽比目的图片长宽都小
26 {
27 IntHeight = SourceImage.Width;
28 IntWidth = SourceImage.Height;
29 }
30 else//长宽比目的图片的长宽都大
31 {
32 IntWidth = TargetWidth;
33 IntHeight = (IntWidth * SourceImage.Height) / SourceImage.Width;
34 if (IntHeight > TargetHeight)//重新计算
35 {
36 IntHeight = TargetHeight;
37 IntWidth = (IntHeight * SourceImage.Width) / SourceImage.Height;
38 }
39 }
40
41 g.DrawImage(SourceImage, (TargetWidth - IntWidth) / 2, (TargetHeight - IntHeight) / 2, IntWidth, IntHeight);
42 SourceImage.Dispose();
43
44 return SaveImage;
45 }
46 catch (Exception ex)
47 {
48
49 }
50
51 return null;
52 }
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