Scales down an image into a box of maxSideLenght x maxSideLength. : Image « 2D Graphics GUI « Java






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

Scales down an image into a box of maxSideLenght x maxSideLength.

 



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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