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| import java.awt.AlphaComposite;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.JComponent;
import javax.swing.JFrame;
public class testimage extends JComponent implements MouseListener,
MouseMotionListener {
private static final long serialVersionUID = 7774248752982522933L;
private BufferedImage image = null;
private Point porig = null;
private Point pmove = null;
public static void main(String args[]) {
final JFrame f = new JFrame("Selection Demo");
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setSize(800, 600);
f.setLocationRelativeTo(null);
try {
f.setContentPane(new testimage(new File("d:/test.bmp")));
} catch (final IOException e) {
e.printStackTrace();
}
f.setVisible(true);
}
public testimage(final File image) throws IOException {
this.image = ImageIO.read(image);
porig = null;
pmove = null;
// ajout des listeners
addMouseListener(this);
addMouseMotionListener(this);
}
@Override
public void paintComponent(final Graphics g) {
super.paintComponent(g);
final Graphics2D g2 = (Graphics2D) g;
if (image != null) {
// dessine l'image en haut à gauche
// fleme de faire mieux
g2
.drawImage(image, 0, 0, image.getWidth(),
image.getHeight(), this);
}
if (pmove != null && porig != null) {
g2.setColor(Color.BLACK);
// calcul de la selection
final Rectangle rect = new Rectangle((pmove.x > porig.x) ? porig.x : pmove.x,
(pmove.y > porig.y) ? porig.y : pmove.y,
(pmove.x > porig.x) ? pmove.x - porig.x : porig.x
- pmove.x, (pmove.y > porig.y) ? pmove.y
- porig.y : porig.y - pmove.y);
// dessine le fond de la selection avec un effet de transparence
g2.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER, .2f));
g2.fillRect(rect.x, rect.y, rect.width, rect.height);
// suppression de la transparence pour dessiner la bordure
g2.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER, 1f));
g2.drawRect(rect.x, rect.y, rect.width, rect.height);
}
}
public void mousePressed(final MouseEvent e) {
porig = e.getPoint(); // récupération du point d'origine
// repaint du composant
repaint();
}
public void mouseReleased(final MouseEvent e) {
// cleanup de l'affichage, mais tu peux faire la découpe ici
pmove = null;
porig = null;
// repaint du composant
repaint();
}
public void mouseDragged(final MouseEvent e) {
pmove = e.getPoint(); // récupération du point en déplacement
// repaint du composant
repaint();
}
public void mouseClicked(final MouseEvent e) { }
public void mouseEntered(final MouseEvent e) { }
public void mouseExited(final MouseEvent e) { }
public void mouseMoved(final MouseEvent e) { }
} |
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