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| public class AbsoluteImagePanel extends JPanel {
private final Timer timer;
private double angle;
public AbsoluteImagePanel() {
super();
setLayout(null);
timer = new Timer(30, new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
moveImages();
}
});
}
private final static double ANGLE = Math.PI/20;
private final static double PIx2 = 2*Math.PI;
private void moveImages() {
Point point = getMousePosition();
if ( point==null ) {
point = MouseInfo.getPointerInfo().getLocation();
SwingUtilities.convertPointFromScreen(point, this);
}
double cx = getWidth()/2d;
double cy = getHeight()/2d;
double speed = Point.distance(cx, cy, point.x, point.y)/50;
angle+=ANGLE*speed;
if ( angle>PIx2 ) angle -= PIx2;
for(Component component : getComponents()) {
Rectangle bounds = component.getBounds();
double x = bounds.getCenterX();
double y = bounds.getCenterY();
double dist = Point.distance(x, y, cx, cy);
x = cx + dist*Math.sin(angle);
y = cy + dist*Math.cos(angle);
component.setLocation((int)(x-bounds.getWidth()/2),(int)(y-bounds.getHeight()/2));
}
}
public void startAnimation() {
timer.start();
}
public void addImage(Image image, int x, int y, int width, int height) {
JLabel label = new JLabel(new ImageIcon(image));
label.setBounds(x, y, width, height);
add(label);
setComponentZOrder(label, 0); // pour que le dernier s'affiche au dessus
}
@Override
public void paint(Graphics g) {
super.paint(g);
g.setColor(Color.RED);
g.setFont(getFont().deriveFont(Font.BOLD));
if ( getLayout()==null ) {
g.drawString("Pas de layout manager", 5 , g.getFontMetrics().getHeight() );
}
else {
g.drawString("Avec " + getLayout().getClass().getSimpleName(), 5, g.getFontMetrics().getHeight());
}
}
public static void main(String[] args) throws IOException {
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
final AbsoluteImagePanel panel = new AbsoluteImagePanel();
frame.getContentPane().add(panel);
final Random random = new Random();
final Image image = ImageIO.read(new File("suricate.png"));
for(int i=0; i<10; i++) {
addImage( panel, image, random );
}
panel.addMouseListener(new MouseAdapter() {
@Override
public void mousePressed(MouseEvent e) {
switch(e.getButton()) {
case MouseEvent.BUTTON1:
addImage( panel , image, random );
panel.repaint();
break;
case MouseEvent.BUTTON3:
if ( panel.getLayout()==null ) {
panel.setLayout(new FlowLayout());
panel.revalidate();
panel.repaint();
}
else {
panel.setLayout(null);
for(Component component : panel.getComponents()) {
Rectangle bounds = randomBounds(random);
component.setBounds(bounds);
}
panel.repaint();
}
break;
}
}
});
frame.setSize(300, 200);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
panel.startAnimation();
}
private static void addImage(AbsoluteImagePanel panel, Image image, Random random) {
Rectangle rectangle = randomBounds(random);
panel.addImage(image, rectangle.x, rectangle.y, rectangle.width, rectangle.height);
}
private static Rectangle randomBounds(Random random) {
int x = random.nextInt(200);
int y = random.nextInt(150);
int width = 10 + random.nextInt(90);
int height = 10 + random.nextInt(90);
return new Rectangle(x, y, width, height);
}
} |
