縮圖
using System;
using System.Drawing;
using System.IO;
/// <summary>
/// 縮圖
/// </summary>
public class ResizeImage
{
public string ImgSrc;
public string ImgOut;
public string copyrsrc;
public string Width;
public string Height;
public string cut;
public string ThumbRatio;
public void Do()
{
string strExtension = System.IO.Path.GetExtension(FC.VirtualFolder + ImgSrc);
if ((strExtension.ToUpper() == ".JPG") | (strExtension.ToUpper() == ".GIF"))
{
if (string.IsNullOrEmpty(ImgOut)) { ImgOut = ImgSrc; }
ImgSrc = FC.VirtualFolder + ImgSrc;
ImgOut = FC.VirtualFolder + ImgOut;
ImgSrc = ImgSrc.Replace("//", "/");
ImgOut = ImgOut.Replace("//", "/");
System.Drawing.Image imageToBeResized = System.Drawing.Image.FromFile(ImgSrc);
int imageHeight = imageToBeResized.Height;
int imageWidth = imageToBeResized.Width;
int maxHeight = int.Parse(Width);
int maxWidth = int.Parse(Height);
imageHeight = (imageHeight * maxWidth) / imageWidth;
imageWidth = maxWidth;
if (imageHeight > maxHeight)
{
imageWidth = (imageWidth * maxHeight) / imageHeight;
imageHeight = maxHeight;
}
Bitmap bitmap = new Bitmap(imageToBeResized, imageWidth, imageHeight);
imageToBeResized.Dispose();
if (File.Exists(ImgOut) == true)
{
FileInfo fi = new FileInfo(ImgOut);
fi.Delete();
}
bitmap.Save(ImgOut, System.Drawing.Imaging.ImageFormat.Jpeg);
bitmap.Dispose();
}
}
// 計算維持比例的縮圖大小
private int[] getThumbnailImageScale(int maxWidth, int maxHeight, int oldWidth, int oldHeight)
{
int[] result = new int[] { 0, 0 };
float widthDividend, heightDividend, commonDividend;
widthDividend = (float)oldWidth / (float)maxWidth;
heightDividend = (float)oldHeight / (float)maxHeight;
commonDividend = (heightDividend > widthDividend) ? heightDividend : widthDividend;
result[0] = (int)(oldWidth / commonDividend);
result[1] = (int)(oldHeight / commonDividend);
return result;
}
}
