Java BufferedImage Crop cropScale(BufferedImage source, int width, int height)

Description

This function crops the image to the aspect ratio of the width and height and then scales the image to the given values

License

Open Source License

Parameter

Parameter	Description
source	is the image to resize
width	is the wanted width
height	is the wanted height

Return

a new image with the specified width and height

Declaration

public static BufferedImage cropScale(BufferedImage source, int width, int height) 

Method Source Code

//package com.java2s;
/*//from   w  ww  .j  av a2  s .com
 * The MIT License (MIT)
 *
 * Copyright (c) 2015 Ziver Koc
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

import java.awt.*;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;

public class Main {
    /**
     * This function crops the image to the aspect ratio of 
     * the width and height and then scales the image to the 
     * given values 
     *
     * @param               source          is the image to resize
     * @param               width           is the wanted width
     * @param               height          is the wanted height
     * @return                        a new image with the specified width and height
     */
    public static BufferedImage cropScale(BufferedImage source, int width, int height) {
        float aspect = width / height;
        BufferedImage tmp = cropToAspectRatio(source, aspect);
        tmp = scale(tmp, width, height, false);
        return tmp;
    }

    /**
     * Crops a image to a specific aspect ration
     *
     * @param      image      is the actual image to crop
     * @param      aspect      is the aspect ratio to convert the image to
     * @return               a new image with the specified aspect ratio
     */
    public static BufferedImage cropToAspectRatio(BufferedImage image, float aspect) {
        int x = 0, y = 0;
        int width = image.getWidth();
        int height = image.getHeight();

        // Check if the width is larger than the heigth
        if (width > height) {
            width = (int) (height * aspect);
            x = image.getWidth() / 2 - width / 2;
        } else {
            height = (int) (width * aspect);
            y = image.getHeight() / 2 - height / 2;
        }

        return image.getSubimage(x, y, width, height);
    }

    /**
     * Resizes a BufferedImage
     * 
     * @param       source       is the image to resize
     * @param       width       is the wanted width
     * @param       height       is the wanted height
     * @param       keep_aspect is if the aspect ratio of the image should be kept
     * @return       the       resized image
     */
    public static BufferedImage scale(BufferedImage source, int width, int height, boolean keep_aspect) {
        double scale_width = (double) width / source.getWidth();
        double scale_height = (double) height / source.getHeight();

        // aspect calculation
        if (keep_aspect) {
            if (scale_width * source.getHeight() > height) {
                scale_width = scale_height;
            } else {
                scale_height = scale_width;
            }
        }

        BufferedImage tmp = new BufferedImage((int) (scale_width * source.getWidth()),
                (int) (scale_height * source.getHeight()), BufferedImage.TYPE_INT_RGB);
        Graphics2D g2d = tmp.createGraphics();

        AffineTransform at = AffineTransform.getScaleInstance(scale_width, scale_height);
        g2d.drawRenderedImage(source, at);
        g2d.dispose();
        return tmp;
    }
}

Related

1. cropImage(BufferedImage src, int x, int y, int w, int h)
2. cropImage(BufferedImage src, int x, int y, int w, int h)
3. cropImage(final BufferedImage img, int x, int y, int w, int h, double xScale, double yScale)
4. cropImageRelative(BufferedImage image, double leftCropFactor, double rightCropFactor, double topCropFactor, double bottomCropFactor)
5. croppedCopy(BufferedImage image, int startX, int startY, int endX, int endY)
6. cropToAspectRatio(BufferedImage image, float aspect)
7. cropToBeSameSize(BufferedImage image1, BufferedImage image2)
8. divideImage(BufferedImage bi, int rows, int cols, int width, int height)
9. doCrop(BufferedImage bufferedImage, int cropX, int cropY, int width, int height)