BPM - Space Invaders con Drools

Usando Drools en los juegos.

 
 
 
 rule "Reverse aliens if one reachs the edge of the screen"
 
     when
 
         $alien : AlienEntity()
 
         exists (AlienEntity(x < 10) or AlienEntity(x > 750))
 
     then
 
         $alien.setHorizontalMovement(-$alien.getHorizontalMovement());
 
         $alien.setY($alien.getY() + 10);
 
 end    
 
  
 rule "Process bullets hitting aliens"
 
     when
 
         $shot : ShotEntity()
 
         $alien : AlienEntity(this != $shot, eval($shot.collidesWith($alien)))
 
         $otherAlien : AlienEntity()
 
     then
 
         game.getEntities().remove($shot);
 
         game.getEntities().remove($alien);
 
         $otherAlien.setHorizontalMovement($otherAlien.getHorizontalMovement() * 1.04);
 
 end
 
  
 rule "End the game when all aliens are killed"
 
     salience 1
 
     when
 
         not AlienEntity()
 
         exists ShipEntity()
 
     then
 
         game.notifyWin();
 
         game.getEntities().clear();
 
 end
 
  
 rule "End the game when an alien reaches the bottom"
 
     when
 
         exists AlienEntity(y > 570)
 
     then
 
         game.notifyDeath();
 
         game.getEntities().clear();
 
 end
 
 
 
 
 
 ref:
 
 http://eis-blog.ucsc.edu/2010/02/space-invaders-enterprise-edition/