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| public class MonDessin extends JFrame {
private JPanel monPanel;
private int xPressed, xDragged, yPressed, yDragged;
private boolean isActive = false;
private boolean drawing = false;
private BufferedImage bimage;
public MonDessin() {
this.setTitle("Test");
this.setSize(800, 800);
this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
JPanel container = new JPanel ();
bimage = new BufferedImage(150, 75, BufferedImage.TYPE_INT_RGB);
monPanel = new JPanel() {
@Override
public void paint(Graphics g) {
super.paint(g);
g.drawImage(bimage, 0, 0, null);
if ( drawing ) {
g.setColor(Color.RED);
g.drawLine(xPressed , yPressed , xDragged , yDragged );
g.fillOval(xDragged -3, yDragged -3, 6, 6);
}
}
};
monPanel.setPreferredSize(new Dimension(150, 75));
monPanel.setBackground(Color.WHITE);
resetImage();
monPanel.addMouseMotionListener(
new MouseMotionListener() {
public void mouseDragged(MouseEvent e) {
if (isActive) {
paintImage();
xPressed = xDragged;
yPressed = yDragged;
xDragged = e.getX();
yDragged = e.getY();
monPanel.repaint();
}
}
public void mouseMoved(MouseEvent e) {
isActive = true;
}
}
);
monPanel.addMouseListener(
new MouseListener() {
// Invoked when a mouse button has been pressed on a component.
public void mousePressed(MouseEvent e) {
if (isActive) {
drawing=true;
xPressed = e.getX();
yPressed = e.getY();
xDragged = xPressed;
yDragged = yPressed;
monPanel.repaint();
}
}
//Invoked when the mouse has been clicked on a component.
public void mouseClicked(MouseEvent e) {
}
//Invoked when a mouse button has been released on a component.
public void mouseReleased(MouseEvent e) {
drawing=false;
paintImage();
}
//Invoked when the mouse enters a component.
public void mouseEntered(MouseEvent e) {
isActive = true;
}
//Invoked when the mouse exits a component.
public void mouseExited(MouseEvent e) {
isActive = false;
}
}
);
container.add(monPanel);
JButton b_enregistrer = new JButton("Enregistrer");
b_enregistrer.setPreferredSize(new Dimension(200, 55));
b_enregistrer.addActionListener(
f -> {
try {
ImageIO.write(bimage, "JPEG", new File("MonDessin.jpg"));
// Desktop.getDesktop().open(new File("MonDessin.jpg")); // pour test visuel
} catch (IOException ex) {
ex.printStackTrace();
}
}
);
container.add(b_enregistrer);
JButton b_effacer = new JButton("Effacer");
b_effacer.setPreferredSize(new Dimension(200, 55));
b_effacer.addActionListener(
f -> {
resetImage();
monPanel.repaint();
}
);
container.add(b_enregistrer);
container.add(b_effacer);
this.setContentPane(container);
}
private void paintImage() {
Graphics2D g = bimage.createGraphics();
g.setColor(Color.BLACK);
g.drawLine(xPressed , yPressed , xDragged , yDragged );
g.dispose();
monPanel.repaint();
}
private void resetImage() {
Graphics2D g = bimage.createGraphics();
g.setColor(monPanel.getBackground());
g.fillRect(0, 0, monPanel.getPreferredSize().width, monPanel.getPreferredSize().height);
g.dispose();
}
public static void main(String[] args) {
new MonDessin().setVisible(true);
}
} |
