Scaling Methods
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;
import java.net.URL;
import javax.imageio.ImageIO;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.SwingUtilities;
/*
* ScalingMethods.java
*
* Created on May 1, 2007, 4:36 PM
*
* Copyright (c) 2007, Sun Microsystems, Inc
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
* * Neither the name of the TimingFramework project nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/**
*
* @author Chet
*/
public class ScalingMethods extends JComponent {
private static BufferedImage picture = null;
private static final int PADDING = 10;
private static final double SCALE_FACTOR = .05;
private int scaleW, scaleH;
/** Creates a new instance of ScalingMethods */
public ScalingMethods() {
try {
URL url = getClass().getResource("BB.jpg");
picture = ImageIO.read(url);
scaleW = (int)(SCALE_FACTOR * picture.getWidth());
scaleH = (int)(SCALE_FACTOR * picture.getHeight());
setPreferredSize(new Dimension(PADDING + (5 * (scaleW + PADDING)),
scaleH + (2 * PADDING)));
} catch (Exception e) {
System.out.println("Problem reading image file: " + e);
System.exit(0);
}
}
/**
* Draws the picture five times, using the five different scaling
* approaches described in the book. All five look the same, since
* all are using default (nearest neighbor) filtering during the
* scale operation.
*/
public void paintComponent(Graphics g) {
int x = PADDING;
int y = PADDING;
// Simplest approach
g.drawImage(picture, x, y, scaleW, scaleH, null);
// Subregion approach
x += scaleW + PADDING;
g.drawImage(picture, x, y, x + scaleW, y + scaleH,
0, 0, picture.getWidth(), picture.getHeight(), null);
// Graphics2D.scale approach
x += scaleW + PADDING;
Graphics2D g2d = (Graphics2D)g.create();
g2d.translate(x, y);
g2d.scale(SCALE_FACTOR, SCALE_FACTOR);
g2d.drawImage(picture, 0, 0, null);
g2d.dispose();
// AffineTransform.scale approach
x += scaleW + PADDING;
g2d = (Graphics2D)g.create();
AffineTransform at = new AffineTransform();
at.translate(x, y);
at.scale(SCALE_FACTOR, SCALE_FACTOR);
g2d.drawImage(picture, at, null);
g2d.dispose();
// getScaledInstance() approach
x += scaleW + PADDING;
Image scaledImg = picture.getScaledInstance(scaleW, scaleH,
Image.SCALE_DEFAULT);
g.drawImage(scaledImg, x, y, null);
}
private static void createAndShowGUI() {
JFrame f = new JFrame("ScalingMethods");
f.setLayout(new BorderLayout());
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
ScalingMethods test = new ScalingMethods();
f.add(test);
f.validate();
f.pack();
f.setVisible(true);
}
public static void main(String args[]) {
Runnable doCreateAndShowGUI = new Runnable() {
public void run() {
createAndShowGUI();
}
};
SwingUtilities.invokeLater(doCreateAndShowGUI);
}
}
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