anchor.diff:      this.friction = friction;
       this.restitution = restitution;
       this.isSensor = isSensor;
  +
  +    this.linearVelocity = linearVelocity;
  +    this.angularVelocity = angularVelocity;
  +    this.angularDampening = angularDampening;
     }
   
     Object tag;
   
  -  PhysicsShape shape;
  +  final PhysicsShape shape;
   
     PhysicsBodyType type;
   
  
positive.code: 
      if (_body == null)
        return;
      for(box2d.Fixture f = _body.getFixtureList(); f != null; f = f.getNext()) {
        f.setFriction(friction);
      }
    }
  
negative.code: 
      if (_body == null)
        return;
      for (box2d.Fixture f = _body.getFixtureList(); f != null; f = f.getNext()) {
        f.setRestitution(restitution);
      }
    }
  