Add second year
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import java.awt.*;
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import java.awt.event.*;
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import javax.swing.*;
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import java.awt.image.*;
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import java.util.*;
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public class InvadersApplication extends JFrame implements Runnable, KeyListener {
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// member data
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private static String workingDirectory = System.getProperty("user.dir");
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private static boolean isGraphicsInitialised = false;
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private Image alienImage;
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private Image altAlienImage;
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private Image playerImage;
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private Image bulletImage;
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private static final Dimension WindowSize = new Dimension(800, 600);
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private static final int NUMALIENS = 30;
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private Alien[] aliensArray = new Alien[NUMALIENS]; // arraylist of all the currently extant bullets
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private ArrayList<PlayerBullet> bullets = new ArrayList<PlayerBullet>();
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boolean right = true; // boolean to tell which direction the aliens are moving
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private Player player;
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private BufferStrategy strategy;
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// variable to hold how far the player should be moving in the x axis per frame - default 0.
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private int dx = 0;
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public boolean gameOver = false; // boolean to tell what state the game is in
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private long score = 0; // player's score
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private long bestScore = 0; // the best score the player has achieved
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// constructor
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public InvadersApplication() {
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// set up window
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setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
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// adding a key listener
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addKeyListener(this);
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// display the window. centred on the screen
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Dimension screensize = java.awt.Toolkit.getDefaultToolkit().getScreenSize();
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int x = screensize.width/2 - WindowSize.width/2; int y = screensize.height/2 - WindowSize.height/2;
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setBounds(x, y, WindowSize.width, WindowSize.height);
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// load image from disk
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ImageIcon alienIcon = new ImageIcon(workingDirectory + "/alien_ship_1.png");
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ImageIcon altAlienIcon = new ImageIcon(workingDirectory + "/alien_ship_2.png");
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ImageIcon playerIcon = new ImageIcon(workingDirectory + "/player_ship.png");
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ImageIcon bulletIcon = new ImageIcon(workingDirectory + "/bullet.png");
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alienImage = alienIcon.getImage();
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altAlienImage = altAlienIcon.getImage();
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playerImage = playerIcon.getImage();
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bulletImage = bulletIcon.getImage();
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// creating a player icon & setting it's position
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player = new Player(playerImage);
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player.setPosition(270, 550);
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setVisible(true);
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createBufferStrategy(2);
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strategy = getBufferStrategy();
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// create a new thread & start it
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Thread t = new Thread(this);
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t.start();
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isGraphicsInitialised = true;
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}
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// thread's entry point
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public void run() {
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while (true) {
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// repainting
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try {
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this.repaint();
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Thread.sleep(20);
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} catch (InterruptedException e) {
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e.printStackTrace();
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}
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}
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}
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@Override
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public void keyPressed(KeyEvent e) {
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// what to do on keypress if the player is alive (game is being played)
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if (player.isAlive) {
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// getting the keycode of the event
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int key = e.getKeyCode();
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// if right key pressed, making the distance to be moved 10px to the right
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if (key == KeyEvent.VK_RIGHT) {
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dx = 5;
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}
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// if left key pressed, making the distance to be moved 10px to the left
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if (key == KeyEvent.VK_LEFT) {
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dx = -5;
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}
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}
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// what to do on keypress if the player is not alive (game is over)
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else {
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// resetting everything so that the game can be restarted
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resetAll();
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}
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}
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@Override
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public void keyReleased(KeyEvent e) {
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// getting the keycode of the event
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int key = e.getKeyCode();
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// if the key released was the left or right arrow, setting dx back to 0
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if (key == KeyEvent.VK_RIGHT || key == KeyEvent.VK_LEFT) {
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dx = 0;
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}
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// if space key released "firing" a bullet (creating one)
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if (key == KeyEvent.VK_SPACE) { // firing bullets on release so that the player can't just hold down space to fire
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bullets.add(new PlayerBullet(player, bulletImage));
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}
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}
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@Override
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public void keyTyped(KeyEvent e) {
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}
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// method to reset everything so that a new game may be started
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public void resetAll() {
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Alien.framesDrawn = 0;
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Alien.aliensKilled = 0;
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Alien.stepSize = 0;
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newWave();
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//aliensArray = null;
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player.setPosition(270, 550);
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player.isAlive = true;
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}
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// gameplay method
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public void gameplay(Graphics g) {
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// checking if any of the aliens hit the edge when they were moved
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for (Alien a : aliensArray) {
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// changing direction & moving down if edge is hit
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if (a.getX() > 750) {
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right = false;
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// looping through all the aliens and moving them down
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for (Alien alien : aliensArray) {
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alien.moveDown();
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}
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break;
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}
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else if (a.getX() < 0) {
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right = true;
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// looping through all the aliens and moving them down
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for (Alien alien : aliensArray) {
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alien.moveDown();
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}
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break;
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}
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}
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// looping through each bullet, moving it, and calling its paint method if it has not collided, removing it and the alien it collided with if it has
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// using an iterator so that bullets can be removed from the list as we loop through
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Iterator bulletsIterator = bullets.iterator();
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while (bulletsIterator.hasNext()) {
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PlayerBullet b = (PlayerBullet) bulletsIterator.next();
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b.move();
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// bullets will be removed to save memory, but aliens will not be removed until a wave is over to preserve correct movement
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for (Alien a : aliensArray) {
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// only checking for collisions if the alien is alive
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if (a.isAlive) {
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// if the bullet collides with an alien, removing the bullet & hiding the alien
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// the aliens dimensions are 50x32
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// the bullets dimensions are 6x16
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if (
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( (a.getX() < b.getX() && a.getX()+50 > b.getX()) || (b.getX() < a.getX() && b.getX()+6 > a.getX()) ) &&
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( (a.getY() < b.getY() && a.getY()+32 > b.getY()) || (b.getY() < a.getY() && b.getY()+16 > a.getY()))
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) {
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bulletsIterator.remove();
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a.kill();
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score = score + 10; // increasing the score once the alien is killed
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b.kill(); // "killing" the bullet so it's not painted before it's been removed
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}
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}
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}
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// painting the bullet if it is "alive"
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if (b.isAlive) {
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b.paint(g);
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}
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}
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// looping through each alien to see if it has collided with the player
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for (Alien a : aliensArray) {
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// checking to see if any of the (alive) aliens have collided with the player
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if (a.isAlive) {
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if (
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// the player's dimensions are 54 x 32
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( (a.getX() < player.getX() && a.getX()+50 > player.getX()) || (player.getX() < a.getX() && player.getX()+54 > a.getX()) )
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&&
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( (a.getY() < player.getY() && a.getY()+32 > player.getY()) || (player.getY() < a.getY() && player.getY()+32 > a.getY()))
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) {
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player.kill(); // "killing" the player
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return;
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}
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}
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}
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// moving the player dx pixels - should be 0 if no key is being pressed
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player.move(dx);
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// iterating through each sprite, moving it, and calling its paint method
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for (Alien a : aliensArray) {
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a.move(right);
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// only painting the alien if it is alive
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if (a.isAlive) {
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a.paint(g);
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}
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}
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// calling the Player's paint method
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player.paint(g);
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}
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// application's paint method
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public void paint(Graphics g) {
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// making sure that the graphics are initialised before painting
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if (isGraphicsInitialised) {
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g = strategy.getDrawGraphics();
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// draw a black rectangle on the whole canvas
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g.setColor(Color.BLACK);
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g.fillRect(0, 0, 800, 600);
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Font f = new Font("Times", Font.PLAIN, 50);
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g.setColor(Color.WHITE);
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// calculating score
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score = Alien.aliensKilled * 10;
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// displaying score and best score
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String scorebar = "Score: " + score + " Best: " + bestScore;
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g.drawString(scorebar, 50, 50);
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// if the game is not over, playing the game. else, displaying a gameover screen.
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if (player.isAlive) {
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// checking if all the aliens are dead, and if so, spawning a new wave
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boolean noAliens = true;
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for (Alien a : aliensArray) {
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if (a != null && a.isAlive) {
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noAliens = false;
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break;
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}
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}
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if (noAliens) {
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newWave();
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}
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gameplay(g);
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}
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else {
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if (score > bestScore) {
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bestScore = score;
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}
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String scores = "Score: " + score + " Best Score: " + bestScore;
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g.drawString("GAME OVER", 400, 300);
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g.drawString(scores, 400, 350);
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g.drawString("Press any key to continue", 400, 400);
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}
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strategy.show();
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}
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}
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// method to spawn a new wave of aliens
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public void newWave() {
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// deleting any existing bullets so the aliens don't spawn on top of them
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bullets.clear();
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// speeding up the aliens
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Alien.speedUp();
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// initial x and y coordinates for the aliens
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int alienx = 200;
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int alieny = 25;
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int column = 0; // keeps track of which column the alien is in
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for (int i = 0; i < NUMALIENS; i++) {
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aliensArray[i] = new Alien(alienImage, altAlienImage);
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aliensArray[i].setPosition(alienx, alieny);
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alienx += 60;
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column++;
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// go onto a new line every 5 aliens
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if (column >= 6) {
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column = 0;
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alienx = 200;
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alieny += 60;
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}
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}
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}
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// application entry point
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public static void main(String[] args) {
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InvadersApplication ia = new InvadersApplication();
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}
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}
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