Fit Image : Image « 2D Graphics GUI « Java

Fit Image


//  Ahy - A pure java CMS.
//  Copyright (C) 2010 Sidney Leal (
//  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 3 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
//  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, see <>.


import java.awt.Graphics2D;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;

import javax.imageio.ImageIO;

public final class ImageUtil {
    public static ByteArrayOutputStream fit(ByteArrayInputStream bais, int width, int height) throws IOException { 
        BufferedImage src =;
        int newWidth;
        int newHeight;
        Float scale;
        if (src.getWidth() > src.getHeight()) {
            scale = Float.valueOf(width) / Float.valueOf(src.getWidth());
        } else {
            scale = Float.valueOf(height) / Float.valueOf(src.getHeight());
        newWidth = Float.valueOf(src.getWidth() * scale).intValue();
        newHeight = Float.valueOf(src.getHeight() * scale).intValue();

       // System.out.println("--- " + src.getWidth() + " - " + width);
       // System.out.println("--- " + src.getHeight() + " - " + height);
       // System.out.println("--- " + scale + " -- " + Float.valueOf(src.getWidth() * scale).intValue() + " -- " + Float.valueOf(src.getHeight() * scale).intValue());
        BufferedImage temp = scale(src, newWidth, newHeight);

        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        ImageIO.write(temp,"JPG", baos);
        return baos;
    public static ByteArrayOutputStream scale(ByteArrayInputStream bais, int width, int height) throws IOException {
        BufferedImage src =;
        BufferedImage dest = scale(src, width, height);
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        ImageIO.write(dest,"JPG", baos);
        return baos;

public static BufferedImage scale(BufferedImage src, int width, int height) throws IOException {
    BufferedImage dest = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
    Graphics2D g = dest.createGraphics();
    AffineTransform at = AffineTransform.getScaleInstance(
    return dest;


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