Pong.java

/*
 * Created classic game to work with swing and graphics
 * and play around with the game logic.
 */

import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;

import javax.swing.JFrame;
import javax.swing.Timer;

public class Pong implements ActionListener, KeyListener {

	public static Pong pong;

	public int width = 700, height = 700;

	public Renderer renderer;

	public Paddle player1;

	public Paddle player2;

	public Ball ball;

	
	public boolean bot = false, selectingDifficulty;

	public boolean w, s, up, down;

	public int gameStatus = 0, scoreLimit = 3, playerWon; 
	// gameStatus: 0 = Stopped, 1 = Paused, // 2 = Playing, 3 = Game over

	private int botMoves = 0;
	private int botCooldown;
	private int botDifficulty;

	public Pong() {

		Timer timer = new Timer(20, this);
		JFrame jframe = new JFrame("Pong");

		renderer = new Renderer();

		jframe.setSize(width, height);
		jframe.setVisible(true);
		jframe.setResizable(false);
		jframe.setLocationRelativeTo(null);
		jframe.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		jframe.add(renderer);
		jframe.addKeyListener(this);

		timer.start();

	}

	public void start() {

		player1 = new Paddle(this, 1);
		player2 = new Paddle(this, 2);
		ball = new Ball(this);
				
		gameStatus = 2;
		
	}

	public void update() {
		
		if (player1.score >= scoreLimit) {
			playerWon = 1;
			gameStatus = 3;
		
		} else if (player2.score >= scoreLimit) {
			playerWon = 2;
			gameStatus = 3;
		}
			
		if (w) {
			player1.move(true);

		} else if (s) {
			player1.move(false);
		}

		if (!bot) {
			if (up) {
				player2.move(true);

			} else if (down) {
				player2.move(false);
			}

		} else {
			if (botCooldown > 0) {
				botCooldown--;

				if (botCooldown == 0) {
					botMoves = 0;
				}
			}

			if (botMoves < 10) {
				if (player2.y + player2.height / 2 < ball.y) {
					player2.move(false);
					botMoves++;
				}

				if (player2.y + player2.height / 2 > ball.y) {
					player2.move(true);
					botMoves++;
				}

				switch (botDifficulty) {
				case 0:
					botCooldown = 20;
					break;
				case 1:
					botCooldown = 15;
					break;
				case 2:
					botCooldown = 10;
				}
			}

		}

	}

	public void render(Graphics2D g) {

		g.setColor(Color.BLACK);
		g.fillRect(0, 0, width, height);
		g.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
				RenderingHints.VALUE_ANTIALIAS_ON);

		if (gameStatus == 0) {
			g.setColor(Color.WHITE);
			g.setFont(new Font("Arial", 1, 100));
			g.drawString("Pong", width / 2 - 125, 200);

			if (!selectingDifficulty) {
				g.setFont(new Font("Arial", 1, 30));
				g.drawString("Press Space to Play", width / 2 - 140, 400);
				g.drawString("Press Shift to Play with Bot", width / 2 - 190,
						450);
				g.drawString("<< Score Limit: " + scoreLimit + " >>",
						width / 2 - 140, 500);

			}
		}

		if (selectingDifficulty) {
			String string = botDifficulty == 0 ? "Easy"
					: (botDifficulty == 1 ? "Medium" : "Hard");

			g.setFont(new Font("Arial", 1, 30));
			g.drawString("<< Bot Difficulty: " + string + " >>",
					width / 2 - 170, 400);
			g.drawString("Press Space to Play", width / 2 - 140, 500);
		}

		if (gameStatus == 1) {
			g.setColor(Color.WHITE);
			g.setFont(new Font("Arial", 1, 100));
			g.drawString("PAUSED", width / 2 - 207, 300);
		}

		if (gameStatus == 1 || gameStatus == 2) {

			// Draw field
			g.setColor(Color.WHITE);
			g.setStroke(new BasicStroke(5f));
			g.drawLine(width / 2, 0, width / 2, height);
			g.setStroke(new BasicStroke(2f));
			g.drawOval(width / 2 - 150, height / 2 - 150, 300, 300);

			// Player score
			g.setFont(new Font("Arial", 1, 50));
			g.drawString(String.valueOf(player1.score), width / 2 - 70, 75);
			g.drawString(String.valueOf(player2.score), width / 2 + 50, 75);

			player1.render(g);
			player2.render(g);
			ball.render(g);
		}

		if (gameStatus == 3) {

			g.setColor(Color.WHITE);
			g.setFont(new Font("Arial", 1, 100));
			g.drawString("Pong", width / 2 - 125, 200);

			if (bot && playerWon == 2) {
				g.setFont(new Font("Arial", 1, 50));
				g.drawString("The Bot Wins!", width / 2  - 170, 350);
			} else {
				g.setFont(new Font("Arial", 1, 50));
				g.drawString("Player " + playerWon + " Wins!", width / 2 - 165,
						350);
			}

			g.setFont(new Font("Arial", 1, 30));

			g.drawString("Press Space to Play Again", width / 2 - 185, 450);
			g.drawString("Press ESC for Menu", width / 2 - 140, 500);

		}

	}

	@Override
	public void actionPerformed(ActionEvent e) {

		if (gameStatus == 2) {
			update();
			ball.update(player1, player2);
		}

		renderer.repaint();

	}

	@Override
	public void keyPressed(KeyEvent e) {

		int id = e.getKeyCode();

		if (id == KeyEvent.VK_W) {
			w = true;

		} else if (id == KeyEvent.VK_S) {
			s = true;

		} else if (id == KeyEvent.VK_UP) {
			up = true;

		} else if (id == KeyEvent.VK_DOWN) {
			down = true;

		} else if (id == KeyEvent.VK_RIGHT) {
			if (selectingDifficulty) {
				if (botDifficulty < 2) {
					botDifficulty++;

				} else {
					botDifficulty = 0;
				}
			} else if (gameStatus == 0) {
				scoreLimit++;
			}

		} else if (id == KeyEvent.VK_LEFT) {
			if (selectingDifficulty) {
				if (botDifficulty > 0) {
					botDifficulty--;

				} else {
					botDifficulty = 2;
				}
			} else if (gameStatus == 0 && scoreLimit > 1) {
				scoreLimit--;
			}

		} else if (id == KeyEvent.VK_SHIFT && gameStatus == 0) {
			bot = true;
			selectingDifficulty = true;

		} else if (id == KeyEvent.VK_SPACE) {
			if (gameStatus == 0) {
				start();
			} else if (gameStatus == 1) {
				gameStatus = 2;
			} else if (gameStatus == 2) {
				gameStatus = 1;
			} else { //(gameStatus == 3)
				start();
			}

		} else if (id == KeyEvent.VK_ESCAPE) {
			gameStatus = 0;
			bot = false;
			selectingDifficulty = false;
		}
	}

	@Override
	public void keyReleased(KeyEvent e) {

		int id = e.getKeyCode();

		if (id == KeyEvent.VK_W) {
			w = false;
		}

		if (id == KeyEvent.VK_S) {
			s = false;
		}

		if (id == KeyEvent.VK_UP) {
			up = false;
		}

		if (id == KeyEvent.VK_DOWN) {
			down = false;
		}
	}

	@Override
	public void keyTyped(KeyEvent e) {

	}

	public static void main(String[] args) {

		pong = new Pong();
	}
}