Java Image Scale getScaledImage(Image image, int maxWidth, int maxHeight)

Description

get Scaled Image

License

Open Source License

Declaration

public static java.awt.Image getScaledImage(Image image, int maxWidth, int maxHeight) 

Method Source Code

//package com.java2s;
/*/*from  www. j  a  v a  2s . co m*/
 * JStock - Free Stock Market Software
 * Copyright (C) 2012 Yan Cheng CHEOK <yccheok@yahoo.com>
 *
 * This program 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.
 *
 * This program 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 this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

import java.awt.Image;

import javax.swing.ImageIcon;

public class Main {
    public static java.awt.Image getScaledImage(Image image, int maxWidth, int maxHeight) {
        // This code ensures that all the pixels in the image are loaded
        image = new ImageIcon(image).getImage();

        final int imgWidth = image.getWidth(null);
        final int imgHeight = image.getHeight(null);

        final int preferredWidth = Math.min(imgWidth, maxWidth);
        final int preferredHeight = Math.min(imgHeight, maxHeight);

        final double scaleX = (double) preferredWidth / (double) imgWidth;
        final double scaleY = (double) preferredHeight / (double) imgHeight;

        final double bestScale = Math.min(scaleX, scaleY);

        return image.getScaledInstance((int) ((double) imgWidth * bestScale),
                (int) ((double) imgHeight * bestScale), Image.SCALE_SMOOTH);
    }
}

Related

1. getScaledIcon(final Image image, final double scale)
2. getScaledImage(final ImageIcon icon, final int newMaxWidth, final int newMaxHeight, final boolean maintainRatio)
3. getScaledImage(Image imagen, double scaleW, double scaleH)
4. getScaledImage(Image srcImg, int w, int h)
5. getScaledImage(ImageIcon icon, int w, int h)
6. getScaledImage(ImageIcon srcImg, int h, int maxWidth)