Problème Casse-Brique Java

Bonjour, je me suis récemment lancé dans un projet de casse brique en java et je suis en proie à un bug que je n'arrive pas à identifier/réctifier. (Au passage, je commence tout juste la programmation par moi-même, je n'ai pas pris de cours en java).
Je vous présente mon problème :
Lorsque la balle arrive en dessous d'une brique, au milieu de celle-ci, elle réagit normalement: casse la brique et repart. Mais lorsqu'elle atteint une brique dans l'extrémité, elle casse la brique mais ne repart pas donc casse une deuxième brique et il se peut qu'elle se fasse un chemin à travers les briques alors que ce n'est normalement pas possible.
voici mon code :
Code:
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import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.event.KeyEvent;
import javax.swing.JFrame;
import javax.swing.JPanel;
import java.awt.event.KeyListener;
 
public class Game extends JPanel{
	//int mapNbBriqueW = 15;
	//int mapNbBriqueH = 30;
	int mapNbBriqueW = 30;						//Nombre briques en longueur
	int mapNbBriqueH = 45;						//Nombre briques en hauteur
	int mapBriqueW = 45;						//Longueur d'une brique
	int mapBriqueH = 15;						//Hauteur d'une brique
	int mapW = mapNbBriqueW*mapBriqueW;			//Longueur de la fenêtre
	int mapH = mapNbBriqueH*mapBriqueH;			//Hauteur de la fenêtre
	int longT = 100;							//Longueur de la raquette
	int xr = mapW/2-longT/2;						//Placement raquette
	int xr2 = xr;
	//int yr = mapH/2;
	int x = 100;									//Initialisation de la balle en (0; 0)
	int y = 150;
	int incX = 1;								//Incrément des vitesses
	int incVitesse = (int)(mapW/600*1.2);
	//int incVitesse = 1;
	int incXVitesse = incVitesse;
	int incY = 1;
	int incYVitesse = incVitesse;
	int gameOver = 0;
	int trait2 = 0;
	int touche = KeyEvent.VK_UNDEFINED;
	int map[][]={								//"dessin" de la carte
 
			//map #1
			{1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
			{1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
			{1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
			{1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
			{1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
			{1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
			{1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
			{1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
			{1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
			{1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
			{1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
			{1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
			{1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
			{1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
			{1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
			{1,1,1,6,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
			{1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
			{1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
			{1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
			{1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
			{1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
			{1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
			{1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
			{1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
			{1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
			{1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
			{1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
			{1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
			{1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
			{1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
	};
 
 
	public Game(JFrame pFrame) {				//Réception des touches
		pFrame.setSize(mapW+19, mapH+48+50);
		addKeyListener(new KeyListener() {
			@Override
			public void keyTyped(KeyEvent e) {
			}
 
			@Override
			public void keyReleased(KeyEvent e) {
				touche = KeyEvent.VK_UNDEFINED;
			}
 
			@Override
			public void keyPressed(KeyEvent e) {
				touche = e.getKeyCode();
			}
		});
		setFocusable(true);
	}
 
	public void trait_move() {					//Propriétés raquette
		if (touche == KeyEvent.VK_LEFT)
			xr-= 10*incVitesse/4;
		if (touche == KeyEvent.VK_RIGHT)
			xr+= 10*incVitesse/4;
		/*if (touche == KeyEvent.VK_UP)
			yr-= 10*incVitesse/4;
		if (touche == KeyEvent.VK_DOWN)
			yr+= 10*incVitesse/4;*/
		if(xr >= mapW-longT)
			xr = mapW-longT;
		if(xr <= 0)
			xr = 0;
	}
 
	public void trait2_move() {					
		if (touche == KeyEvent.VK_RIGHT)
			xr2-= 10*incVitesse/4;
		if (touche == KeyEvent.VK_LEFT)
			xr2+= 10*incVitesse/4;
		/*if (touche == KeyEvent.VK_UP)
			yr-= 10*incVitesse/4;
		if (touche == KeyEvent.VK_DOWN)
			yr+= 10*incVitesse/4;*/
		if(xr2 >= mapW-longT)
			xr2 = mapW-longT;
		if(xr2 <= 0)
			xr2 = 0;
	}
 
	@Override
	public void paint(Graphics g) {				//Formes et couleurs
		super.paint(g);
		Graphics2D g2d = (Graphics2D) g;
		g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
				RenderingHints.VALUE_ANTIALIAS_ON);
		for (int i=0; i<map.length; i++) {
			for (int j=0; j<map[i].length; j++) {
				Color briqueColor = Color.RED;
				switch (map[i][j]) {
					case 1:
						briqueColor = Color.RED;
						break;
					case 2:
						briqueColor = Color.YELLOW;
						break;
					case 3:
						briqueColor = Color.BLUE;
						break;
					case 4:
						briqueColor = Color.GRAY;
						break;
					case 5:
						briqueColor = Color.MAGENTA;
						break;
					case 6:
						briqueColor = Color.GREEN;
						break;
				}
				g2d.setColor(briqueColor);				//Briques
				if (map[i][j]>0)
					g2d.fillRect(i*mapBriqueW, j*mapBriqueH, mapBriqueW-1, mapBriqueH-1);
				}
		}		
 
		g2d.setColor(Color.BLUE);				//Balle
		g2d.fillOval(x, y, 15, 15);
		g2d.setColor(Color.DARK_GRAY);				//Raquette
		g2d.fillRect(xr, /*yr*/mapH-15, longT, 3);
		g2d.setColor(Color.MAGENTA);			//Contours de la map
		g2d.drawRect(0, 0, mapW, mapH);
		g2d.setColor(Color.BLACK);
 
		//Légende
		g2d.setColor(Color.RED);
		g2d.fillRect(500, mapH+48-40, mapBriqueW, mapBriqueH);
		g2d.setColor(Color.YELLOW);
		g2d.fillRect(500, mapH+48-25/2, mapBriqueW, mapBriqueH);
		g2d.setColor(Color.BLUE);
		g2d.fillRect(750, mapH+48-40, mapBriqueW, mapBriqueH);
		g2d.setColor(Color.DARK_GRAY);
		g2d.fillRect(750, mapH+48-25/2, mapBriqueW, mapBriqueH);
		g2d.setColor(Color.MAGENTA);
		g2d.fillRect(1000, mapH+48-40, mapBriqueW, mapBriqueH);
		g2d.setColor(Color.GREEN);
		g2d.fillRect(1000, mapH+48-25/2, mapBriqueW, mapBriqueH);
		g2d.setColor(Color.DARK_GRAY);
		g2d.drawString("Brique '1'", 500+mapBriqueW, mapH+48-40+10);
		g2d.drawString("Brique '2'", 500+mapBriqueW, mapH+48-25/2+10);
		g2d.drawString("Brique '3'", 750+mapBriqueW, mapH+48-40+10);
		g2d.drawString("Malus (Raquette /2)", 750+mapBriqueW, mapH+48-25/2+10);
		g2d.drawString("Bonus (Raquette *2)", 1000+mapBriqueW, mapH+48-40+10);
		g2d.drawString("Fin du niveau", 1000+mapBriqueW, mapH+48-25/2+10);
		String result = String.format("coordonnées de la balle : %d,%d", x, y);
		g2d.drawString(result, 10, mapH+48-25);
		result = String.format("coordonnées de la balle (briques) : %d,%d", x/mapBriqueW, y/mapBriqueH);
		g2d.drawString(result, 10, mapH+48-25/2);
		/*result = String.format("map.length = %d, map[0].length = %d", map.length, map[0].length);
		g2d.drawString(result, 200, mapH+48-25);*/
 
		if (gameOver==1) {
			g2d.setColor(Color.DARK_GRAY);
			g.setFont(new Font("TimesRoman", Font.BOLD, 50)); 
			g2d.drawString("Fin du jeu", mapW/2-75, mapH/2);
		}
 
		if (gameOver==2) {
			g2d.setColor(Color.DARK_GRAY);
			g.setFont(new Font("TimesRoman", Font.PLAIN, 50)); 
			g2d.drawString("Niveau terminé", mapW/2-125, mapH/2);
		}
 
		if (trait2==0) {
		}
 
		if (trait2==1) {
			g2d.setColor(Color.RED);
			g2d.fillRect(xr2, /*yr*/mapH-15, longT, 3);
		}
 
	}
 
	public void balle_move() throws InterruptedException {					//Propriétés balle
		if(y < mapH) {
			if(map[x/mapBriqueW][y/mapBriqueH]>0 && map[x/mapBriqueW][y/mapBriqueH]<4) {
				map[x/mapBriqueW][y/mapBriqueH]--;
				incY = incY*-1;
			}
			else if(map[x/mapBriqueW][y/mapBriqueH]==4) {
				map[x/mapBriqueW][y/mapBriqueH]=0;
				if (trait2==0) {
					longT = longT/2;
					incY = incY*-1;
					//Thread.sleep(5000);
					//longT = 100;
				}
				else {
					trait2 = 0;
				}
			}
			else if(map[x/mapBriqueW][y/mapBriqueH]==5) {
				map[x/mapBriqueW][y/mapBriqueH]=0;
				trait2 = 1;
				incY = incY*-1;
			}
			else if(map[x/mapBriqueW][y/mapBriqueH]==6) {
				map[x/mapBriqueW][y/mapBriqueH]=0;
				incVitesse = 0;
				gameOver=2;
			}
			if(x+incX*incXVitesse*incVitesse <= 0 || x+incX*incXVitesse*incVitesse >= mapW-15)
				incX = incX*-1;
			if(y+incY*incYVitesse*incVitesse <= 0 /*|| y+incYVitesse*incVitesse >= mapH-15*/)
				incY = incY*-1;
			if(y+incY*incYVitesse*incVitesse >= mapH-30+3 && (x+incX*incXVitesse*incVitesse+15/2 >= xr && x+incX*incXVitesse*incVitesse+15/2 <= xr+longT)) {
				if(x+incX*incXVitesse*incVitesse+15/2 >= xr+longT/4 && x+incX*incXVitesse*incVitesse+15/2 <= xr+longT/2+longT/4) {
					incXVitesse = incVitesse;
					System.out.print("vitesse normale\nok\n");
				}
				else if(x+incX*incXVitesse*incVitesse+15/2 <= xr+longT/10 || x+incX*incXVitesse*incVitesse+15/2 >= xr+longT/2+4*longT/10) {
					if(incX<0 && x+incX*incXVitesse*incVitesse+15/2 >= xr+longT/2+4*longT/10) {
						incXVitesse = 2*incVitesse;
						incX = -1;
						System.out.print("vitesse x2\nretour\nok\n");
					}
					else if(incX<0 && x+incX*incXVitesse*incVitesse+15/2 <= xr+longT/10) {
						incXVitesse = 2*incVitesse;
						System.out.print("vitesse x2\nretour\nok\n");
					}
					else if(incX>0 && x+incX*incXVitesse*incVitesse+15/2 >= xr+longT/2+4*longT/10) {
						incXVitesse = 2*incVitesse;
						System.out.print("vitesse x2\nretour\nok\n");
					}
					else if(incX>0 && x+incX*incXVitesse*incVitesse+15/2 <= xr+longT/10) {
						incXVitesse = 2*incVitesse;
						incX = -1;
						System.out.print("vitesse x2\nretour\nok\n");
					}
				}
				else{
					incXVitesse = 2*incVitesse;
					System.out.print("vitesse x2\nok\n");
				}
				incY = -1;
			}
			if (trait2==1) {
				if(y+incY*incYVitesse*incVitesse >= mapH-30+3 && (x+incX*incXVitesse*incVitesse+15/2 >= xr2 && x+incX*incXVitesse*incVitesse+15/2 <= xr2+longT)) {
					if(x+incX*incXVitesse*incVitesse+15/2 >= xr2+longT/4 && x+incX*incXVitesse*incVitesse+15/2 <= xr2+longT/2+longT/4) {
						incXVitesse = incVitesse;
						System.out.print("vitesse normale\nok\n");
					}
					else if(x+incX*incXVitesse*incVitesse+15/2 <= xr2+longT/10 || x+incX*incXVitesse*incVitesse+15/2 >= xr2+longT/2+4*longT/10) {
						if(incX<0 && x+incX*incXVitesse*incVitesse+15/2 >= xr2+longT/2+4*longT/10) {
							incXVitesse = 2*incVitesse;
							incX = -1;
							System.out.print("vitesse x2\nretour\nok\n");
						}
						else if(incX<0 && x+incX*incXVitesse*incVitesse+15/2 <= xr2+longT/10) {
							incXVitesse = 2*incVitesse;
							System.out.print("vitesse x2\nretour\nok\n");
						}
						else if(incX>0 && x+incX*incXVitesse*incVitesse+15/2 >= xr2+longT/2+4*longT/10) {
							incXVitesse = 2*incVitesse;
							System.out.print("vitesse x2\nretour\nok\n");
						}
						else if(incX>0 && x+incX*incXVitesse*incVitesse+15/2 <= xr2+longT/10) {
							incXVitesse = 2*incVitesse;
							incX = -1;
							System.out.print("vitesse x2\nretour\nok\n");
						}
					}
					else{
						incXVitesse = 2*incVitesse;
						System.out.print("vitesse x2\nok\n");
					}
					incY = -1;
				}
			}
			x = x+incX*incXVitesse*incVitesse;
			y = y+incY*incYVitesse*incVitesse;
		}
		else {									//Perdu
			gameOver = 1;
			incVitesse = 0;
			//System.out.println("Fin du jeu");
		}
	}
 
	public static void main(String[] args) throws InterruptedException {
		JFrame frame = new JFrame("Jeu");
		Game jeu = new Game(frame);
		frame.add(jeu);
		frame.setLocationRelativeTo(null);
		frame.setVisible(true);
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 
		while(true){
			jeu.balle_move();
			jeu.trait_move();
			jeu.trait2_move();
			jeu.repaint();
			Thread.sleep(10);
		}
	}
}
Les collisions de ma balle sont codés à la ligne 213 jusqu'à la ligne 317.
Voici mon problème :
Pièce jointe 455008

Merci d'avance pour votre aide et votre temps.
Cordialement
Paul