====== Projekt: Sidescroller-Game (Stand vor der 3. Hausaufgabe) ======

Hier die Programmdateien Stand 31.03.2020:

==== Die Klasse Sidescroller ====
<code java>
World w = new World(800, 600);

new Sidescroller();


class Sidescroller extends Actor {

   Spaceship spaceship;
   Group bullets = new Group();
   Group enemies = new Group();
   
   int points = 0; 
   Text pointsText = new Text(5, 5, 40, "0 Punkte");

   int lives = 3; 
   Text livesText = new Text(795, 5, 40, lives + " Leben");
   
   Text großerText = new Text(400, 200, 60, "");
   Text kleinerText = new Text(400, 300, 40, "Press s to start!");
   
   // zustand == 0 bedeutet: Warten auf Spielbeginn
   // zustand == 1 bedeutet: im Spiel
   // zustand == 2 bedeutet: zwischen zwei Spielen
   int state = 0;
   

   public Sidescroller() {
      super();
      // Hier startet das Programm
      spaceship = new Spaceship(this);
      livesText.setAlignment(Alignment.right);
      großerText.setAlignment(Alignment.center);
      kleinerText.setAlignment(Alignment.center);
      setState(0);
   }
   
   public void onKeyTyped(String key) {
      if(key == "s" && state != 1) {
         setState(1); 
      }
   }
   
   
   public void addBullet(double x, double y, double vx, double vy, double radius) {
      Bullet b = new Bullet(x, y, vx, vy, radius);
      bullets.add(b);
   }

   public void act() {
      if(state == 1) { 
         generateEnemies();
         checkCollisionsBulletsWithEnemies();
         checkCollisionSpaceshipWithEnemies();
      }
   }

   private void checkCollisionSpaceshipWithEnemies() {
      Shape[] collidingEnemies = enemies.getCollidingShapes(spaceship);
      
      if(collidingEnemies.length > 0) {
         Enemy e =(Enemy)collidingEnemies[0]; 
        
         double le = Math.sqrt(e.getWidth() * e.getHeight());

         new Explosion(e.getCenterX(), e.getCenterY(), le / 50);
        
         e.destroy();
         lives--;
         updateText();
         
         if(lives == 0) {
            System.playSound(Sound.far_bomb);
            setState(2);
         } else {
            System.playSound(Sound.cannon_boom);
         }
         
      }
      
   }
   
   private void generateEnemies() {
      if(Math.random() < 0.05) {
         Enemy e = new Enemy();
         enemies.add(e);
      }
   }

   private void checkCollisionsBulletsWithEnemies() {
      
      CollisionPair[] pairs = bullets.getCollisionPairs(enemies, true);

      for(int i = 0; i < pairs.length; i++) {
         
         CollisionPair cp = pairs[i];
         cp.shapeA.destroy();

         Rectangle r =(Rectangle)cp.shapeB;

         double le = Math.sqrt(r.getWidth() * r.getHeight());

         new Explosion(r.getCenterX(), r.getCenterY(), le / 50);
         
         points += 10;
         updateText();
         
         cp.shapeB.destroy();

      }



   }
   

   public void updateText() {
      pointsText.setText(points + " Punkte");
      livesText.setText(lives + " Leben");
   }

   public void addPoints(int p) {
      points = points + p;
      updateText();
      
   }

   private void setState(int newState) {
   
      if(newState == 0) {
         spaceship.setVisible(false);
         großerText.setText("Spielname");
         großerText.setFillColor(Color.darkgreen);
         großerText.setVisible(true);
         kleinerText.setVisible(true);
      } else if(newState == 1) {
         spaceship.setVisible(true);
         lives = 3;
         points = 0;
         spaceship.setCenter(100, 300);
         updateText();
         großerText.setVisible(false);
         kleinerText.setVisible(false);
      } else if(newState == 2) {
         spaceship.setVisible(false);
         großerText.setText("Game over");
         großerText.setFillColor(Color.darkred);
         großerText.setVisible(true);
         kleinerText.setVisible(true);
      }
      
      state = newState;
   }  
}
</code>

==== Die Klasse Spaceship====
<code java>

class Spaceship extends Sprite {

   double v = 6;
   Sidescroller sidescroller;
   int timeSinceLastBullet = 0;

   public Spaceship(Sidescroller s) {

      super(80, 270, SpriteLibrary.Ship_Adrian, 2);
      scale(2);
      sidescroller = s;

   }

   public void act() {

      if(sidescroller.state != 1) return;

      if(isKeyDown(Key.ArrowUp)) {
         if(getCenterY() > 30) {
            move(0, -v);
         }
      }

      if(isKeyDown(Key.ArrowDown)) {
         if(getCenterY() < 570) {
            move(0, v);
         }
      }

      if(isKeyDown(Key.ArrowRight)) {
         if(getCenterX() < 370) {
            move(v, 0);
         }
      }

      if(isKeyDown(Key.ArrowLeft)) {
         if(getCenterX() > 80) {
            move(-v, 0);
         }
      }

      timeSinceLastBullet++; 
      if(isKeyDown(" ")) {
         if(timeSinceLastBullet > 5) {
            System.playSound(Sound.shoot);
            if(timeSinceLastBullet > 30) {
               sidescroller.addBullet(getCenterX() + 15, getCenterY(), 15, 0, 10);
            } else {
               sidescroller.addBullet(getCenterX() + 15, getCenterY(), 15, 0, 5);
            }
            timeSinceLastBullet = 0;
         }

      }
      

   }
}
</code>

==== Die Klasse Bullet ====
<code java>
class Bullet extends Circle {
   
   double vx;
   double vy;

   public Bullet(double x, double y, double vx1, double vy1, double radius) {
      
      super(x, y, radius);
      vx = vx1;
      vy = vy1;
      setFillColor(Color.white);

   }

   public void act() {
      move(vx, vy);
      if(isOutsideView()) {
         destroy();
      }
   }
}
</code>


==== Die Klasse Enemy ====
<code java>
class Enemy extends Rectangle {

   double vx; 
   double vy;
   double vw;

   public Enemy() {

      super(850, Math.random() * 600, Math.random() * 250 + 50, Math.random() * 250 + 50);
      
      vy = Math.random()*5 - 2.5;
      vx = -Math.random() * 5 - 5;
      vw = Math.random() * 10 - 5;

      int red = Math.floor(Math.random() * 200 + 56); 
      int green = Math.floor(Math.random() * 200 + 56); 
      int blue = Math.floor(Math.random() * 200 + 56); 

      setFillColor(Color.fromRGBA(red, green, blue, Math.random() * 0.7 + 0.3));


   }

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

      if(getCenterX() < - 1000) {
         destroy();
      }

   }
}
</code>

==== Die Klasse Explosion ====
<code java>
class Explosion extends Sprite {


   public Explosion(double x, double y, double size) {
            
      super(x, y, SpriteLibrary.Explosion_1, 0);

      playAnimation(0, 60, RepeatType.once, 20);

      scale(size);

   }
}
</code>