FallDownEngine.java

import java.awt.*;
import java.util.*;
import javax.swing.*;

public class FallDownEngine
{
	public static final double GRAVITY = .5;
	public static final int WIDTH = 300;
	public static final int HEIGHT = 300;
	public static final int BRICK_LAYER_DELAY = 100;
	public static final int SPEED_UP_DELAY = 70;

	private Vector<Brick> bricks = new Vector();
	private Ball ball;
	private int brickSpeed = 2;
	private int brickDelay = 0;
	private int speedDelay = 0;
	private int points = -1;

	public FallDownEngine()
	{
		ball = new Ball(WIDTH/2, HEIGHT/2);
		createBrickLayer();
	}

	public void createBrickLayer()
	{
		int hole = (int)((WIDTH/Brick.WIDTH)*Math.random());
		for(int i = 0; i < (WIDTH/Brick.WIDTH); i++)
		{
			if(i != hole)
			{
				bricks.add(new Brick(i*Brick.WIDTH+Brick.WIDTH/2, HEIGHT+Brick.HEIGHT));
			}
		}
		points++;
	}

	public void removeOldBricks()
	{
		for(int i = 0; i < bricks.size(); i++)
		{
			if(bricks.get(i).getLocation().getY() < 0)
			{
				bricks.remove(i);
				i--;
			}
		}
	}

	public void moveBricks()
	{
		for(int i = 0; i < bricks.size(); i++)
		{
			bricks.add(i, bricks.get(i).move(0,-brickSpeed));
			bricks.remove(i+1);
		}
	}

	public void affectBall()
	{
		for(int i = 0; i < bricks.size(); i++)
		{
			ball = bricks.get(i).affect(ball);
		}
		ball = ball.accelerate(0, GRAVITY);
		if(ball.getLocation().getY() > HEIGHT)
			ball = ball.setPosition((int)ball.getLocation().getX(), HEIGHT);
	}

	public void moveLeft()
	{
		ball = ball.moveLeft();
		while(ball.getLocation().getX() < 0)
			ball = ball.moveRight();
	}

	public void moveRight()
	{
		ball = ball.moveRight();
		while(ball.getLocation().getX() > WIDTH)
			ball = ball.moveLeft();
	}

	public void update()
	{
		if(ball.getLocation().getY() >= -Ball.RADIUS)
		{
			ball = ball.move();
			moveBricks();
			removeOldBricks();
			brickDelay = brickDelay+brickSpeed;
			if(brickDelay > BRICK_LAYER_DELAY)
			{
				brickDelay = 0;
				speedDelay++;
				if(speedDelay > SPEED_UP_DELAY)
				{
					speedDelay = 0;
					brickSpeed++;
				}
				createBrickLayer();
			}
			affectBall();
		}
	}

	public void draw(Graphics g)
	{
		if(ball.getLocation().getY() < -Ball.RADIUS)
		{
			g.setColor(Color.BLUE);
			g.drawString("You Lose", WIDTH/2-27, HEIGHT/2);
		}
		else
			ball.draw(g);
		for(int i = 0; i < bricks.size(); i++)
			bricks.get(i).draw(g);
		g.setColor(Color.BLUE);
		g.drawString("Points: "+points, 10, 20);
	}
	public void draw(Graphics g, FallDownComponent component)
	{
		if (ball.getLocation().getY() < -Ball.RADIUS) {
			g.setColor(Color.BLUE);
			g.drawString("You Lose", WIDTH / 2 - 27, HEIGHT / 2);

			// Create and add buttons
			JButton replayButton = new JButton("Replay");
			JButton quitButton = new JButton("Quit");

			replayButton.setBounds(WIDTH / 2 - 50, HEIGHT / 2 + 30, 100, 30);
			quitButton.setBounds(WIDTH / 2 - 50, HEIGHT / 2 + 70, 100, 30);

			replayButton.addActionListener(e -> component.resetGame());
			quitButton.addActionListener(e -> System.exit(0));

			component.add(replayButton);
			component.add(quitButton);
			component.revalidate();
			component.repaint();
		} else {
			ball.draw(g);
			for (int i = 0; i < bricks.size(); i++) {
				bricks.get(i).draw(g);
			}
			g.setColor(Color.BLUE);
			g.drawString("Points: " + points, 10, 20);
		}
	}

}