Mega Code Archive
Scales down an image into a box of maxSideLenght x maxSideLength
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import java.awt.*;
import java.awt.image.BufferedImage;
/*
* This file is part of the Caliph and Emir project: http://www.SemanticMetadata.net.
*
* Caliph & Emir is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Caliph & Emir is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even 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 Caliph & Emir; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Copyright statement:
* --------------------
* (c) 2002-2006 by Mathias Lux (mathias@juggle.at)
* http://www.juggle.at, http://www.SemanticMetadata.net
*/
/**
* Some little helper methods.<br>
* This file is part of the Caliph and Emir project: http://www.SemanticMetadata.net
* <br>Date: 02.02.2006
* <br>Time: 23:33:36
*
* @author Mathias Lux, mathias@juggle.at
*/
public class ImageUtils {
/**
* Scales down an image into a box of maxSideLenght x maxSideLength.
* @param image the image to scale down. It remains untouched.
* @param maxSideLength the maximum side length of the scaled down instance. Has to be > 0.
* @return the scaled image, the
*/
public static BufferedImage scaleImage(BufferedImage image, int maxSideLength) {
assert(maxSideLength > 0);
double originalWidth = image.getWidth();
double originalHeight = image.getHeight();
double scaleFactor = 0.0;
if (originalWidth > originalHeight) {
scaleFactor = ((double) maxSideLength / originalWidth);
}
else {
scaleFactor = ((double) maxSideLength / originalHeight);
}
// create smaller image
BufferedImage img = new BufferedImage((int) (originalWidth * scaleFactor), (int) (originalHeight * scaleFactor), BufferedImage.TYPE_INT_RGB);
// fast scale (Java 1.4 & 1.5)
Graphics g = img.getGraphics();
g.drawImage(image, 0, 0, img.getWidth(), img.getHeight(), null);
return img;
}
}
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