Thumbnail Generator : Image IO « 2D Graphics GUI « Java
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));
}
}
