uqac-java-pigeon/src/com/rthoni/uqac/pigeon/Game.java

package com.rthoni.uqac.pigeon;

import javax.swing.*;
import javax.swing.Timer;
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import java.util.List;

/**
 * Created by ZHAJOR on 30/10/2016.
 */
public class Game extends JPanel implements MouseListener, ActionListener
{

    private List<Pigeon> pigeons;
    private List<Food> foods;

    /**
     * Initialize the game and create some pigeons
     */
    public Game(int nb){
        addMouseListener(this);
        this.pigeons = new ArrayList<Pigeon>();
        this.foods = new ArrayList<Food>();
        for(int i = 0; i < nb; ++i){
            Pigeon p = new Pigeon(""+i, this);
            this.pigeons.add(p);
            p.start();
        }
        this.createTimer();
    }

    /**
     * Paint the scene
     * @param g The graphics
     */
    @Override
    public void paint(Graphics g) {
        Graphics2D g2d = (Graphics2D) g;
        g2d.setColor(Color.RED);
        // Draw piegons
        for (Pigeon pigeon : this.pigeons) {
            g2d.fillOval(pigeon.getX(), pigeon.getY(), 30, 30);
        }
        g2d.setColor(Color.BLUE);
        // Draw foods
        synchronized (this) {
            for (Food food : this.foods) {
                g2d.fillRect(food.getX(), food.getY(), 15, 15);
            }
        }
    }

    @Override
    public void mouseClicked(MouseEvent e) {

    }

    @Override
    public synchronized void mousePressed(MouseEvent e) {
        this.foods.add(new Food(e.getX(), e.getY()));
    }

    @Override
    public void mouseReleased(MouseEvent e) {

    }

    @Override
    public void mouseEntered(MouseEvent e) {

    }

    @Override
    public void mouseExited(MouseEvent e) {

    }

    public List<Food> getFoods(){
        return this.foods;
    }

    public synchronized void removeFood(Food food){
        this.foods.remove(food);
    }

    private void createTimer(){
        new Timer(50, this).start();
    }
    @Override
    public void actionPerformed(ActionEvent e) {
        repaint();
    }
}