text: //
  //  AtomMinusContactVisitor.h
  //  ColorAtom
  //
  //  Created by 杨萧玉 on 14-4-18.
  //  Copyright (c) 2014年 杨萧玉. All rights reserved.
  //
  
  #import "ContactVisitor.h"
  
  @interface AtomMinusNodeContactVisitor : ContactVisitor
  /*Atom访问了Atom，同类碰撞*/
  -(void) visitAtomPlusNode:(SKPhysicsBody*) anotherAtomBody;
  -(void) visitAtomMinusNode:(SKPhysicsBody*) anotherAtomBody;
  /*Atom访问了边界，也就是球撞墙上了*/
  -(void) visitPlayFieldScene:(SKPhysicsBody*) playfieldBody;
  /*撞上了sharp*/
  -(void) visitAtomSharpNode:(SKPhysicsBody*) anotherAtomBody;
  @end
  