Java ByteBuffer Size fitToSize(BufferedImage source, int targetWidth, int targetHeight)

Description

Scale the image with original aspect ratio, then cut to fit the target size if necessary.

License

Apache License

Parameter

Parameter	Description
source	Source image.
targetWidth	Width in pixel.
targetHeight	Height in pixel.

Return

The image with exactly the size.

Declaration

public static BufferedImage fitToSize(BufferedImage source, int targetWidth, int targetHeight) 

Method Source Code

//package com.java2s;
//License from project: Apache License 

import java.awt.Graphics2D;

import java.awt.image.BufferedImage;

public class Main {
    /**//from  w w w  . ja v a 2s  .  co m
     * Scale the image with original aspect ratio, then cut to fit the target
     * size if necessary.
     * 
     * @param source
     *            Source image.
     * @param targetWidth
     *            Width in pixel.
     * @param targetHeight
     *            Height in pixel.
     * @return The image with exactly the size.
     */
    public static BufferedImage fitToSize(BufferedImage source, int targetWidth, int targetHeight) {
        int sourceWidth = source.getWidth();
        int sourceHeight = source.getHeight();
        if (sourceWidth == targetWidth && sourceHeight == targetHeight) {
            return source;
        }
        // scale:
        int sx1 = 0;
        int sy1 = 0;
        int sx2 = sourceWidth;
        int sy2 = sourceHeight;
        if (sourceWidth * targetHeight < sourceHeight * targetWidth) {
            // cut height:
            int newHeight = (int) ((float) sourceWidth * targetHeight / targetWidth);
            sy1 = (sourceHeight - newHeight) / 2;
            sy2 = sy1 + newHeight;
        } else if (sourceWidth * targetHeight > sourceHeight * targetWidth) {
            // cut width:
            int newWidth = (int) ((float) sourceHeight * targetWidth / targetHeight);
            sx1 = (sourceWidth - newWidth) / 2;
            sx2 = sx1 + newWidth;
        }
        BufferedImage target = new BufferedImage(targetWidth, targetHeight, source.getType());
        Graphics2D g = target.createGraphics();
        g.drawImage(source, 0, 0, targetWidth, targetHeight, sx1, sy1, sx2, sy2, null);
        g.dispose();
        return target;
    }
}

Related

1. enhance(int size, ByteBuffer bbuf)
2. ensureBufferCapacity(final int width, final int height, BufferedImage img)
3. erodeImage(final BufferedImage img, int structElementWidth, int structElementHeight, final int rgbForegroundColor, final int rgbBackgroundColor)
4. findNewHeight(BufferedImage origImage, double newWidth)
5. FindResolution(BufferedImage img, double print_width, double print_height)
6. generateScaledImage(final BufferedImage bufImg, @SuppressWarnings("unused") final Object hintsArg, final int size)
7. makeBrighterRectangleOnImage(BufferedImage image, int leftPosition, int topPosition, int width, int height, double scaleFactor, Color borderColor, Stroke borderStroke)
8. makeOval(BufferedImage input, int width, int height)
9. makeTarget(BufferedImage image, int x, int y, int width, int height)