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/**
* @version 1.00 1999-09-11
* @author Cay Horstmann
*/
import java.awt.Container;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Shape;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.font.FontRenderContext;
import java.awt.font.TextLayout;
import java.awt.geom.AffineTransform;
import java.awt.geom.GeneralPath;
import java.awt.geom.Line2D;
import java.awt.geom.Point2D;
import javax.swing.ButtonGroup;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
public class ClipTest {
public static void main(String[] args) {
JFrame frame = new ClipTestFrame();
frame.show();
}
}
class ClipTestFrame extends JFrame implements ActionListener {
public ClipTestFrame() {
setTitle("ClipTest");
setSize(300, 300);
addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
Container contentPane = getContentPane();
canvas = new ClipPanel();
contentPane.add(canvas, "Center");
JPanel buttonPanel = new JPanel();
ButtonGroup group = new ButtonGroup();
noClipButton = new JRadioButton("No Clip", true);
buttonPanel.add(noClipButton);
group.add(noClipButton);
noClipButton.addActionListener(this);
clipButton = new JRadioButton("Clip", false);
buttonPanel.add(clipButton);
group.add(clipButton);
clipButton.addActionListener(this);
contentPane.add(buttonPanel, "North");
}
public void actionPerformed(ActionEvent event) {
Object source = event.getSource();
if (source == clipButton)
canvas.setClip(true);
else if (source == noClipButton)
canvas.setClip(false);
}
private JRadioButton clipButton;
private JRadioButton noClipButton;
private ClipPanel canvas;
}
class ClipPanel extends JPanel {
public void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2 = (Graphics2D) g;
if (clip) {
FontRenderContext context = g2.getFontRenderContext();
Font f = new Font("Serif", Font.PLAIN, 100);
GeneralPath clipShape = new GeneralPath();
TextLayout layout = new TextLayout("Hello", f, context);
AffineTransform transform = AffineTransform.getTranslateInstance(0,
100);
Shape outline = layout.getOutline(transform);
clipShape.append(outline, false);
layout = new TextLayout("World", f, context);
transform = AffineTransform.getTranslateInstance(0, 200);
outline = layout.getOutline(transform);
clipShape.append(outline, false);
g2.draw(clipShape);
g2.clip(clipShape);
}
final int NLINES = 50;
Point2D p = new Point2D.Double(0, 0);
for (int i = 0; i < NLINES; i++) {
double x = (2 * getWidth() * i) / NLINES;
double y = (2 * getHeight() * (NLINES - 1 - i)) / NLINES;
Point2D q = new Point2D.Double(x, y);
g2.draw(new Line2D.Double(p, q));
}
}
public void setClip(boolean c) {
clip = c;
repaint();
}
private boolean clip;
}
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