Java lernen durch Ausprobieren!

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====== Programmzustand nach der Weiterentwicklung ======


<HTML>

<div class="java-online" style="height: 400px; width: 100%" data-java-online="{'withBottomPanel': true, 'id': 'spacedebris3'}">

<script type="text/plain" title="SpaceDebrisGame.java">
new SpaceDebrisGame();


class SpaceDebrisGame extends Actor {
   
   Spaceship spaceship;

   Group debrisGroup = new Group();

   Group bullets = new Group();

   double debrisRate = 0.06;

   int ships = 3;
   Text shipsText;
   Text bigText;
   
   Text punkteAnzeige;
   int punkte = 0;

   String zustand = "";
   int lastTimeFired = 0;

   int spielzeit = 0;   // spielzeit in 1/30 s


   SpaceDebrisGame() {
      super();
      spaceship = new Spaceship();
      shipsText = new Text(10, 10, 40, "3");
      bigText = new Text(400, 200, 80, "");
      bigText.setAlignment(Alignment.center);

      punkteAnzeige = new Text(750, 10, 40, "0");
      punkteAnzeige.setAlignment(Alignment.right);

      setZustand("startScreen");
   }

   public void act() {

      spielzeit++;
      
      spaceship.v = 4 + 4 * spielzeit / 9000.0;

      if(isKeyDown(" ")) {
         if(zustand == "startScreen") {
            setZustand("gameRunning");
         } else if(zustand == "gameOver") {
            setZustand("startScreen");
         }
      }

      if(zustand != "gameRunning") {
         return;
      }

      if(Math.random() < debrisRate + debrisRate * (spielzeit / 6000.0)) {

         double factor = 1 + spielzeit / 9000.0;

         double vx = (-5 - Math.random() * 10) * factor;
         double vy = (Math.random() * 10 - 5) * factor;

         Debris debris = new Debris(vx, vy);
         debrisGroup.add(debris);
      }

      if(isKeyDown(" ") && System.currentTimeMillis() - lastTimeFired > 300) {
         Bullet b = new Bullet(spaceship.getCenterX(), spaceship.getCenterY());
         bullets.add(b);
         lastTimeFired = System.currentTimeMillis();
      }

      CollisionPair[] pairs = bullets.getCollisionPairs(debrisGroup, true);
      for(int i = 0; i < pairs.length; i++) {
         CollisionPair pair = pairs[i];
         Debris debris = (Debris)pair.shapeB;
         debris.explode();

         double fläche = debris.getWidth() * debris.getHeight();
         punkte = punkte - Math.round(0.0024 * (fläche - 2500)) + 100;
         punkteAnzeige.setText(punkte + "");

         pair.shapeA.destroy();
         pair.shapeB.destroy();
      }

      Shape[] collidingDebris = debrisGroup.getCollidingShapes(spaceship);

      for(int i = 0; i < collidingDebris.length; i++) {
         Debris debris = (Debris)collidingDebris[i];
         debris.explode();
         debris.destroy();
         ships--;
         shipsText.setText(ships + "");
         if(ships == 0) {
            setZustand("gameOver");
         }
      }



   }


   void setZustand(String neuerZustand) {
      
      if(neuerZustand == "startScreen") {
         debrisGroup.destroyAllChildren();
         spaceship.setVisible(false);
         bullets.destroyAllChildren();
         bigText.setVisible(true);
         bigText.setText("Space Debris-Game");
      } else if(neuerZustand == "gameRunning") {
         spielzeit = 0;
         punkte = 0;
         punkteAnzeige.setText("0");
         spaceship.setVisible(true);
         bigText.setVisible(false);
         ships = 3;
         shipsText.setText(ships + ""); 
      } else if(neuerZustand == "gameOver") {
         debrisGroup.destroyAllChildren();
         spaceship.setVisible(false);
         bullets.destroyAllChildren();
         bigText.setVisible(true);
         bigText.setText("Game Over");
      }


      zustand = neuerZustand;
   }



}
</script>
<script type="text/plain" title="Bullet.java">
class Bullet extends Circle {

   Bullet(double x, double y) {
      super(x, y, 5);
   }

   public void act() {
      move(30, 0);
      if(isOutsideView()) {
         destroy();
      }
   }
   
}
</script>
<script type="text/plain" title="Debris.java">
class Debris extends Rectangle {
   
   double w = Math.random() * 10 - 5;
   double vx;
   double vy;

   Debris(double vx, double vy) {
      
      super(830, Math.random() * 500 + 50, Math.random() * 150 + 50, Math.random() * 150 + 50);

      this.vx = vx;
      this.vy = vy;

      setFillColor(Color.randomColor(50));
      setAlpha(Math.random() * 0.5 + 0.5);

   }

   
   public void act() {
      move(vx, vy);
      rotate(w);

      if(getCenterX() < 100 && isOutsideView()) {
         destroy();
      }
   }

   void explode() {
      Sprite explosion = new Sprite(getCenterX(), getCenterY(), SpriteLibrary.Explosion_1, 0, ScaleMode.linear);
      explosion.scale(8 * getWidth() * getHeight() / 40000);
      explosion.playAnimation(0, 55, RepeatType.once, 30);
      Sound.playSound(Sound.far_bomb);
   }

}
</script>
<script type="text/plain" title="Spaceship.java">
new Spaceship();


class Spaceship extends Sprite {
   
   double v = 4.0;

   Spaceship() {
      super(50, 300, SpriteLibrary.Ship_1, 0, ScaleMode.nearest_neighbour);
      scale(1.5);
   }

   public void act() {
      
      double vx = 0;
      double vy = 0;

      if(isKeyDown(Key.ArrowUp) && getCenterY() > 20) {
         vy = -v;
      }
      if(isKeyDown(Key.ArrowDown) && getCenterY() < getWorld().getHeight() - 20) {
         vy = v;
      }
      if(isKeyDown(Key.ArrowLeft) && getCenterX() > 45) {
         vx = -v;
      }
      if(isKeyDown(Key.ArrowRight) && getCenterX() < getWorld().getWidth() / 2) {
         vx = v;
      }

      double l = Math.sqrt(vx * vx + vy * vy);
      if(l > 0) {
         vx = vx / l * v;
         vy = vy / l * v;
         move(vx, vy);
      }

   }


}
</script>

</div>

</HTML>