public void CollidesWithHostile(Player p)
 {
     //Behaviour for Asteroids
     foreach (Asteroid a in _asteroids)
     {
         //Check player + asteroid collision
         if (SwinGame.CircleTriangleCollision(a.Shape, p.Shape) && p.Collision)
         {
             p.Destroy();
         }
         //Check player missle + asteroid collision
         foreach (Missile playerMissile in p.Missiles._missles)
         {
             if (SwinGame.CircleCircleCollision(a.Shape, playerMissile.Shape))
             {
                 SwinGame.PlaySoundEffect(SwinGame.SoundEffectNamed("hitEnemy"));
                 a.Active             = false;
                 playerMissile.Active = false;
                 playerMissile.AddScore();
             }
         }
     }
     //Behaviour for aliens
     foreach (Alien a in _aliens)
     {
         //Check player + alien collision
         if (SwinGame.CircleTriangleCollision(a.Shape, p.Shape) && p.Collision)
         {
             p.Destroy();
         }
         //Check player + alien missiles collision
         a.Missiles.PlayerCollidesWithMissile(p);
         //Check player missle + alien collision
         foreach (Missile playerMissile in p.Missiles._missles)
         {
             if (SwinGame.CircleCircleCollision(a.Shape, playerMissile.Shape) && a.Collision)
             {
                 a.Destroy();
                 playerMissile.Active = false;
                 playerMissile.AddScore();
             }
         }
     }
 }