Thumbnail Generator : Image IO « 2D Graphics GUI « Java

1. Java
2. 2D Graphics GUI
3. Image IO

Thumbnail Generator

     
/*
 *
 * Part of the InfoGlue Content Management Platform (www.infoglue.org)
 *
 * 
 *
 *  Copyright (C)
 * 
 * This program is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License version 2, as published by the
 * Free Software Foundation. See the file LICENSE.html for more information.
 * 
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY, including the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc. / 59 Temple
 * Place, Suite 330 / Boston, MA 02111-1307 / USA.
 *
 * 
 */


import java.awt.*;
import java.awt.image.*;
import java.io.*;

public class ThumbnailGenerator 
{
  public ThumbnailGenerator()
  {
  }
  
  public void transform(String originalFile, String thumbnailFile, int thumbWidth, int thumbHeight, int quality) throws Exception 
  {
    Image image = javax.imageio.ImageIO.read(new File(originalFile));
      
      double thumbRatio = (double)thumbWidth / (double)thumbHeight;
      int imageWidth    = image.getWidth(null);
      int imageHeight   = image.getHeight(null);
      double imageRatio = (double)imageWidth / (double)imageHeight;
      if (thumbRatio < imageRatio) 
      {
        thumbHeight = (int)(thumbWidth / imageRatio);
      } 
      else 
      {
          thumbWidth = (int)(thumbHeight * imageRatio);
      }
      
    if(imageWidth < thumbWidth && imageHeight < thumbHeight)
    {
      thumbWidth = imageWidth;
      thumbHeight = imageHeight;
    }
    else if(imageWidth < thumbWidth)
      thumbWidth = imageWidth;
    else if(imageHeight < thumbHeight)
      thumbHeight = imageHeight;

      BufferedImage thumbImage = new BufferedImage(thumbWidth, thumbHeight, BufferedImage.TYPE_INT_RGB);
      Graphics2D graphics2D = thumbImage.createGraphics();
      graphics2D.setBackground(Color.WHITE);
      graphics2D.setPaint(Color.WHITE); 
      graphics2D.fillRect(0, 0, thumbWidth, thumbHeight);
      graphics2D.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
      graphics2D.drawImage(image, 0, 0, thumbWidth, thumbHeight, null);
      
    javax.imageio.ImageIO.write(thumbImage, "JPG", new File(thumbnailFile));
  }
}

   
    
    
    
    
  

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