AffineTransform demo
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Container;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GridLayout;
import java.awt.Image;
import java.awt.MediaTracker;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.geom.AffineTransform;
import java.awt.image.AffineTransformOp;
import java.awt.image.BufferedImage;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
public class AffineTransformApp extends JFrame {
DisplayPanel displayPanel;
JComboBox scaleXval, scaleYval, shearXval, shearYval;
String[] scaleValues = { "0.10", "0.25", "0.50", "0.75", "1.00", "1.25",
"1.50", "1.75", "2.00" };
String[] shearValues = { "0.00", "0.25", "0.50", "0.75", "1.00" };
public AffineTransformApp() {
super();
Container container = getContentPane();
displayPanel = new DisplayPanel();
container.add(displayPanel);
JPanel panel = new JPanel();
panel.setLayout(new GridLayout(2, 4, 5, 5));
scaleXval = new JComboBox(scaleValues);
scaleXval.setSelectedItem("1.00");
scaleXval.addActionListener(new ComboBoxListener());
scaleYval = new JComboBox(scaleValues);
scaleYval.setSelectedItem("1.00");
scaleYval.addActionListener(new ComboBoxListener());
shearXval = new JComboBox(shearValues);
shearXval.setSelectedItem("0.00");
shearXval.addActionListener(new ComboBoxListener());
shearYval = new JComboBox(shearValues);
shearYval.setSelectedItem("0.00");
shearYval.addActionListener(new ComboBoxListener());
panel.add(new JLabel("Scale X value:"));
panel.add(scaleXval);
panel.add(new JLabel("Scale Y value:"));
panel.add(scaleYval);
panel.add(new JLabel("Shear X value:"));
panel.add(shearXval);
panel.add(new JLabel("Shear Y value:"));
panel.add(shearYval);
container.add(BorderLayout.SOUTH, panel);
addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
setSize(displayPanel.getWidth(), displayPanel.getHeight() + 10);
setVisible(true);
}
public static void main(String arg[]) {
new AffineTransformApp();
}
class ComboBoxListener implements ActionListener {
public void actionPerformed(ActionEvent e) {
JComboBox temp = (JComboBox) e.getSource();
if (temp == scaleXval) {
displayPanel.scalex = Double.parseDouble((String) temp
.getSelectedItem());
displayPanel.applyValue(true, false);
displayPanel.applyFilter();
displayPanel.repaint();
} else if (temp == scaleYval) {
displayPanel.scaley = Double.parseDouble((String) temp
.getSelectedItem());
displayPanel.applyValue(true, false);
displayPanel.applyFilter();
displayPanel.repaint();
} else if (temp == shearXval) {
displayPanel.shearx = Double.parseDouble((String) temp
.getSelectedItem());
displayPanel.applyValue(false, true);
displayPanel.applyFilter();
displayPanel.repaint();
} else if (temp == shearYval) {
displayPanel.sheary = Double.parseDouble((String) temp
.getSelectedItem());
displayPanel.applyValue(false, true);
displayPanel.applyFilter();
displayPanel.repaint();
}
}
}
}
class DisplayPanel extends JLabel {
Image displayImage;
BufferedImage biSrc, biDest;
BufferedImage bi;
Graphics2D big;
AffineTransform transform;
double scalex = 1.0;
double scaley = 1.0;
double shearx = 1.0;
double sheary = 1.0;
DisplayPanel() {
setBackground(Color.black);
loadImage();
setSize(displayImage.getWidth(this), displayImage.getWidth(this)); // panel
createBufferedImages();
transform = new AffineTransform();
}
public void loadImage() {
displayImage = Toolkit.getDefaultToolkit().getImage(
"largeJava2sLogo.jpg");
MediaTracker mt = new MediaTracker(this);
mt.addImage(displayImage, 1);
try {
mt.waitForAll();
} catch (Exception e) {
System.out.println("Exception while loading.");
}
if (displayImage.getWidth(this) == -1) {
System.out.println(" Missing .jpg file");
System.exit(0);
}
}
public void createBufferedImages() {
biSrc = new BufferedImage(displayImage.getWidth(this), displayImage
.getHeight(this), BufferedImage.TYPE_INT_RGB);
big = biSrc.createGraphics();
big.drawImage(displayImage, 0, 0, this);
bi = biSrc;
biDest = new BufferedImage(displayImage.getWidth(this), displayImage
.getHeight(this), BufferedImage.TYPE_INT_RGB);
}
public void applyValue(boolean scale, boolean shear) {
if (scale) {
transform.setToScale(scalex, scaley);
scale = false;
} else if (shear) {
transform.setToShear(shearx, sheary);
shear = false;
}
}
public void applyFilter() {
AffineTransformOp op = new AffineTransformOp(transform, null);
Graphics2D biDestG2D = biDest.createGraphics();
biDestG2D
.clearRect(0, 0, biDest.getWidth(this), biDest.getHeight(this));
op.filter(biSrc, biDest);
bi = biDest;
}
public void reset() {
big.setColor(Color.black);
big.clearRect(0, 0, bi.getWidth(this), bi.getHeight(this));
big.drawImage(displayImage, 0, 0, this);
}
public void update(Graphics g) {
g.clearRect(0, 0, getWidth(), getHeight());
paintComponent(g);
}
public void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2D = (Graphics2D) g;
g2D.drawImage(bi, 0, 0, this);
}
}
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