Ball.java

package game.pong;

import java.awt.*;

public class Ball {

    private int ballSize = 15;

    private int x = Game.WIDTH / 2;
    private int y = Game.HEIGHT / 2;

    private int xVelocity = -2;
    private int yVelocity = -2;

    public void update() {

        x = x + xVelocity;
        y = y + yVelocity;

        if(x < 0){
            xVelocity = 3;
        }else if(x + ballSize + 5 > 600){
            xVelocity = -3;
        }

        if(y < 0){
            yVelocity = 3;
        }else if(y + ballSize * 2 + 10 > 400){
            yVelocity = -3;
        }
}

    public void paint(Graphics g){
        g.setColor(Color.WHITE);
        g.fillOval(x, y, ballSize, ballSize);
    }

    private void reverseVelocity(){
        xVelocity = -xVelocity + 2;
    }

    public void hasCollided(Player player){
        if(this.x > player.getX() && this.x < player.getX() + player.getWidth()){
            if(this.y > player.getY() && this.y < player.getY() + player.getHeight()){
                reverseVelocity();
            }
        }
    }

    public void hasCollided(Computer computer){
        if(this.x > computer.getX() && this.x < computer.getX() + computer.getWidth()){
            if(this.y > computer.getY() && this.y < computer.getY() + computer.getHeight()){
                reverseVelocity();
            }
        }
    }

    public int getY() {
        return y;
    }
}