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/**
* @version 1.00 1999-09-11
* @author Cay Horstmann
*/
import java.awt.Color;
import java.awt.Container;
import java.awt.Graphics;
import java.awt.Graphics2D;
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.geom.Rectangle2D;
import javax.swing.ButtonGroup;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
public class TransformTest {
public static void main(String[] args) {
JFrame frame = new TransformTestFrame();
frame.show();
}
}
class TransformTestFrame extends JFrame implements ActionListener {
public TransformTestFrame() {
setTitle("TransformTest");
setSize(300, 300);
addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
Container contentPane = getContentPane();
canvas = new TransformPanel();
contentPane.add(canvas, "Center");
JPanel buttonPanel = new JPanel();
ButtonGroup group = new ButtonGroup();
rotateButton = new JRadioButton("Rotate", true);
buttonPanel.add(rotateButton);
group.add(rotateButton);
rotateButton.addActionListener(this);
translateButton = new JRadioButton("Translate", false);
buttonPanel.add(translateButton);
group.add(translateButton);
translateButton.addActionListener(this);
scaleButton = new JRadioButton("Scale", false);
buttonPanel.add(scaleButton);
group.add(scaleButton);
scaleButton.addActionListener(this);
shearButton = new JRadioButton("Shear", false);
buttonPanel.add(shearButton);
group.add(shearButton);
shearButton.addActionListener(this);
contentPane.add(buttonPanel, "North");
}
public void actionPerformed(ActionEvent event) {
Object source = event.getSource();
if (source == rotateButton)
canvas.setRotate();
else if (source == translateButton)
canvas.setTranslate();
else if (source == scaleButton)
canvas.setScale();
else if (source == shearButton)
canvas.setShear();
}
private TransformPanel canvas;
private JRadioButton rotateButton;
private JRadioButton translateButton;
private JRadioButton scaleButton;
private JRadioButton shearButton;
}
class TransformPanel extends JPanel {
public TransformPanel() {
square = new Rectangle2D.Double(-50, -50, 100, 100);
t = new AffineTransform();
setRotate();
}
public void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2 = (Graphics2D) g;
g2.translate(getWidth() / 2, getHeight() / 2);
g2.setPaint(Color.gray);
g2.draw(square);
g2.transform(t);
/*
* we don't use setTransform because we want to compose with the current
* translation
*/
g2.setPaint(Color.black);
g2.draw(square);
}
public void setRotate() {
t.setToRotation(Math.toRadians(30));
repaint();
}
public void setTranslate() {
t.setToTranslation(20, 15);
repaint();
}
public void setScale() {
t.setToScale(2.0, 1.5);
repaint();
}
public void setShear() {
t.setToShear(-0.2, 0);
repaint();
}
private Rectangle2D square;
private AffineTransform t;
}
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