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| import java.awt.BorderLayout;
import java.awt.Canvas;
import java.awt.Color;
import java.awt.Component;
import java.awt.FlowLayout;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Paint;
import java.awt.Shape;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.awt.geom.Ellipse2D;
import java.awt.geom.Rectangle2D;
import javax.swing.DefaultComboBoxModel;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
public class DemoShape {
public static void main(String[] args) {
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel panel = new JPanel();
panel.setLayout(new BorderLayout());
frame.setContentPane(panel);
TestCanvas canvas = new TestCanvas();
panel.add(canvas, BorderLayout.CENTER);
panel.add(createControlPanel(canvas), BorderLayout.SOUTH);
frame.setSize(500,200);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
private static Component createControlPanel(final TestCanvas canvas) {
JPanel panel = new JPanel();
panel.setLayout(new FlowLayout());
// une combo pour choisir les shapes bouton pour afficher un rectangle
DefaultComboBoxModel<AbstractShape> comboModel = new DefaultComboBoxModel<>(createShapes());
JComboBox<AbstractShape> combo = new JComboBox<>(comboModel);
combo.addItemListener(new ItemListener() {
@Override
public void itemStateChanged(ItemEvent e) {
if ( e.getItem()!=null ) {
AbstractShape shapeCreator = (AbstractShape) e.getItem();
Shape shape = shapeCreator.create(10, 10, 100, 100);
canvas.setShape(shape);
}
else {
canvas.setShape(null);
}
}
});
panel.add(combo);
// une checkbox ou activer ou pas le foreground
final JCheckBox foregroundCheckbox = new JCheckBox("ForeGround");
// on initialise un foreground
foregroundCheckbox.setSelected(true);
canvas.setForeGroundPaint(Color.BLACK);
foregroundCheckbox.addChangeListener(new ChangeListener() {
@Override
public void stateChanged(ChangeEvent e) {
if ( foregroundCheckbox.isSelected() ) {
canvas.setForeGroundPaint(Color.BLACK);
}
else {
canvas.setForeGroundPaint(null);
}
}
});
panel.add ( foregroundCheckbox );
// une checkbox ou activer ou pas le background
final JCheckBox backgroundCheckbox = new JCheckBox("Background");
backgroundCheckbox.addChangeListener(new ChangeListener() {
@Override
public void stateChanged(ChangeEvent e) {
if ( backgroundCheckbox.isSelected() ) {
canvas.setBackGroundPaint(Color.ORANGE);
}
else {
canvas.setBackGroundPaint(null);
}
}
});
panel.add ( backgroundCheckbox );
return panel;
}
/**
* Méthode que tu peux enrichir avec de nouvelles shapes...
* @return
*/
private static AbstractShape[] createShapes() {
return new AbstractShape[] {
new AbstractShape("Aucun") {
@Override
public Shape create(double x, double y, double w,
double h) {
return null;
}
},
new AbstractShape("Rectangle") {
@Override
public Shape create(double x, double y, double w,
double h) {
return new Rectangle2D.Double(x, y, w, h);
}
},
new AbstractShape("Cercle") {
@Override
public Shape create(double x, double y, double w,
double h) {
return new Ellipse2D.Double(x, y, w, h);
}
},
};
}
private static class TestCanvas extends Canvas {
private Shape shape;
private Paint fg;
private Paint bg;
public TestCanvas() {
}
public void setShape(Shape shape) {
this.shape=shape;
repaint();
}
public void setForeGroundPaint(Paint fg) {
this.fg=fg;
repaint();
}
public void setBackGroundPaint(Paint bg) {
this.bg=bg;
repaint();
}
@Override
public void paint(Graphics g) {
super.paint(g);
if ( shape!=null ) {
Graphics2D g2d = (Graphics2D)g;
if ( bg!=null ) {
g2d.setPaint(bg);
g2d.fill(shape);
}
if ( fg!=null ) {
g2d.setPaint(fg);
g2d.draw(shape);
}
}
}
}
private static abstract class AbstractShape {
private String name;
public AbstractShape(String name) {
this.name=name;
}
public abstract Shape create(double x, double y, double w, double h);
public String toString() {
return name;
}
}
} |
