Problème d'affichage de Balle(s) à l'écran sur la fenêtre d'une appli java sous NetBeans
Bonjour,
Je souhaite afficher la vue d'une balle blanche sur un écran noir sur ma fenêtre de mon application java sous NetBeans au clic de la souris.
J'ai 3 fichiers :
Main.java :
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| package balles;
import javax.swing.*;
public class Main {
public static void main(String[] args)
{
JFrame frame = new JFrame("Balles");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().setLayout(new BoxLayout(frame.getContentPane(),BoxLayout.Y_AXIS));
Balles ballCanvas = new Balles();
frame.getContentPane().add(ballCanvas);
frame.pack();
frame.setVisible(true);
ballCanvas.start();
}
} |
Balles.java :
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| /*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package balles;
import java.awt.Dimension;
import java.awt.Canvas;
import java.awt.RenderingHints;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Color;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionListener;
import java.awt.image.BufferStrategy;
import java.util.Random;
/**
*
* @author
*/
public class Balles extends Canvas {
// Rendering / Buffer objects
private BufferStrategy strategy;
private Graphics2D g2;
// Ball objects
private Ball[] balls = new Ball[5000];
private Ball tempBall;
private Ball currentBall;
private int ballCount = 0;
public Balles() {
setPreferredSize(new Dimension(800, 600));
setIgnoreRepaint(true);
// Evénement(s) clic
MouseHandler mouseHandler = new MouseHandler();
addMouseMotionListener(mouseHandler);
addMouseListener(mouseHandler);
}
public void start()
{
mainStart();
}
public void mainStart()
{
lance();
}
public void generateBalls(int numBalls)
{
Random rand = new Random();
for (int i = 0; i < numBalls; i++)
{
Ball tempBall = new Ball(rand.nextInt(10) + getWidth()/2, rand.nextInt(10) + getHeight()/2, 10);
balls[ballCount] = tempBall;
ballCount++;
}
}
public void lance()
{
if (strategy == null || strategy.contentsLost())
{
// Creation BufferStrategy pour affichage
createBufferStrategy(2);
strategy = getBufferStrategy();
Graphics g = strategy.getDrawGraphics();
this.g2 = (Graphics2D) g;
}
this.g2.setRenderingHint (RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
// Affichage arrière plan
this.g2.setColor(Color.BLACK);
this.g2.fillRect(0, 0, getWidth(), getHeight());
// Affichage des objets
for(int i = 0; i < ballCount; i++)
{
balls[i].draw(this.g2);
}
Ball tempBall = currentBall;
if (tempBall != null) tempBall.draw(this.g2);
if (!strategy.contentsLost()) strategy.show();
}
private class MouseHandler extends MouseAdapter implements MouseMotionListener
{
public void mousePressed(MouseEvent e)
{
Ball tempBall = new Ball(e.getX(), e.getY(), 15);
}
public void mouseReleased(MouseEvent e)
{
balls[ballCount] = tempBall;
ballCount++;
}
}
public class Ball implements Comparable<Ball>{
public Vector2d position;
private float radius;
public Ball(float x, float y, float radius)
{
this.position = new Vector2d(x, y);
this.setRadius(radius);
}
public void draw(Graphics2D g2)
{
g2.setColor(new Color(255, 255, 255));
g2.fillOval( (int) (position.getX() - getRadius()), (int) (position.getY() - getRadius()), (int) (2 * getRadius()) , (int) (2 * getRadius()) );
}
public void setRadius(float radius) {
this.radius = radius;
}
public float getRadius() {
return radius;
}
public int compareTo(Ball ball) {
if (this.position.getX() - this.getRadius() > ball.position.getX() - ball.getRadius())
{
return 1;
}
else if (this.position.getX() - this.getRadius() < ball.position.getX() - ball.getRadius())
{
return -1;
}
else
{
return 0;
}
}
}
} |
Vector2d.java :
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| package balles;
public class Vector2d {
private float x;
private float y;
public Vector2d(float x, float y)
{
this.setX(x);
this.setY(y);
}
public void setX(float x) {
this.x = x;
}
public float getX() {
return x;
}
public void setY(float y) {
this.y = y;
}
public float getY() {
return y;
}
} |
Le programme ne m'affiche pas d'erreur(s) à l'écran ni sur le terminal de sortie.
Mais il n'y a pas de balle blanche au clic de la souris.
Merci pour votre aide
