1
/// <summary>
2
/// 按比例缩放图片
3/// </summary>
4/// <param name="imgUrl">图片的路径</param>
5/// <param name="imgHeight">图片的高度</param>
6/// <param name="imgWidth">图片的宽度</param>
7
/// <returns></returns>
8
public
static
string GetImageSize(
string imgUrl,
int imgHeight,
int imgWidth)
9
{
10string fileName = System.Web.HttpContext.Current.Server.MapPath(imgUrl);
11string strResult = string.Empty;
12if(System.IO.File.Exists(fileName) && imgHeight != 0 && imgWidth != 0)
13
{
14decimal desWidth;decimal desHeight; //目标宽高
15 System.Drawing.Image objImage = System.Drawing.Image.FromFile(fileName);
16decimal radioAct = (decimal)objImage.Width/(decimal)objImage.Height; //原始图片的宽高比
17 decimal radioLoc = (decimal)imgWidth/(decimal)imgHeight; //图片位的宽高比
18 if(radioAct > radioLoc) //原始图片比图片位宽
19 {
20decimal dcmZoom = (decimal)imgWidth/(decimal)objImage.Width;
21 desHeight = objImage.Height*dcmZoom;
22 desWidth = imgWidth;
23
}
24else
25{
26decimal dcmZoom = (decimal)imgHeight/(decimal)objImage.Height;
27 desWidth = objImage.Width*dcmZoom;
28 desHeight = imgHeight;
29 }
30 objImage.Dispose(); //释放资源
31 strResult = "width=\"" + Convert.ToString((int)desWidth) + "\" height=\""
32 + Convert.ToString((int)desHeight) + "\" ";
33 }
34return strResult;
35 }
/// <summary>2
/// 按比例缩放图片3
/// </summary>4
/// <param name="imgUrl">图片的路径</param>5
/// <param name="imgHeight">图片的高度</param>6
/// <param name="imgWidth">图片的宽度</param>7
/// <returns></returns>
8
public
static
string GetImageSize(
string imgUrl,
int imgHeight,
int imgWidth)
9
{
10
string fileName = System.Web.HttpContext.Current.Server.MapPath(imgUrl);11
string strResult = string.Empty;12
if(System.IO.File.Exists(fileName) && imgHeight != 0 && imgWidth != 0)13
{14
decimal desWidth;decimal desHeight; //目标宽高15
System.Drawing.Image objImage = System.Drawing.Image.FromFile(fileName);16
decimal radioAct = (decimal)objImage.Width/(decimal)objImage.Height; //原始图片的宽高比17
decimal radioLoc = (decimal)imgWidth/(decimal)imgHeight; //图片位的宽高比18
if(radioAct > radioLoc) //原始图片比图片位宽19
{ 20
decimal dcmZoom = (decimal)imgWidth/(decimal)objImage.Width;21
desHeight = objImage.Height*dcmZoom;22
desWidth = imgWidth;23
}24
else25
{26
decimal dcmZoom = (decimal)imgHeight/(decimal)objImage.Height;27
desWidth = objImage.Width*dcmZoom;28
desHeight = imgHeight;29
}30
objImage.Dispose(); //释放资源31
strResult = "width=\"" + Convert.ToString((int)desWidth) + "\" height=\""32
+ Convert.ToString((int)desHeight) + "\" ";33
}34
return strResult;35
}
本文转自高海东博客园博客，原文链接：http://www.cnblogs.com/ghd258/archive/2005/11/07/270447.html，如需转载请自行联系原作者
