Lesson 4: Sounds and Explosions

Sounds

For sounds, we use JGT's SimpleClip. It is a simple wrapper around Java's javax.sound.sampled.Clip class. We give a file name to the constructor to load a sound, and use the play() method to play the sound.

We add three sounds to the game, and load them at the beginning.

public class MyGame extends BaseApp {
   
   SimpleClip _boom, _fire, _destroyed;
   
   (...)
   
   /** game entry point **/
   public void run() {
      try {
         // sound by "bliss" (on Freesound.iua.upf.edu)
         _boom = new SimpleClip("gamedata/boom.wav");
         _fire = new SimpleClip("gamedata/wuw1.wav");
         // sound by "meatball4u" (on Freesound.iua.upf.edu)
         _destroyed = new SimpleClip("gamedata/17226_meatball4u_explode4.wav");
         
         (...)

Now we want to play these sounds. We modify MyGame to play "_destroyed" when the player dies. As you can see, all we need to do is add a call to play():

   /** main game loop **/
   public void playLevel() {
        (...)
        collision =CollisionDetection.findCollisionListSlow(_enemyBullets,_shipList);
        if (null!=collision && !collision._a.isEmpty()) {
           System.out.println("Boom! You died");
           // done with the level
           _destroyed.play();
           return;
        }
   }

public class Enemy extends VisibleObject {
    (...)
    
    /** called when hit; returns true if the enemy should die **/
    public boolean hitKills() {
       _life--;
       if (_life==0) {
          // die
          _world._boom.play();
          _alive = false;
       }
       return !_alive;
    }
}

And finally the "_fire" should should play when we fire, so we modify the Ship class:

public class Ship extends VisibleObject {
   (...)
   
   public void fire() {
      _main._fire.play();
      _main._bullets.add( new Bullet(this) );
   }
}

Next: 10 - Explosions