让精灵改变方向并前进

//让精灵动起来，并改变方向
void EnemyBase::changeDirection(float dt)  
{  
    auto curr = currPoint();  
    if(curr->getPositionX() > this->getPosition().x )  
    {  
        runAction( Animate::create(AnimationCache::getInstance()->getAnimation("runright"))) ;  
    }else{  
        runAction( Animate::create(AnimationCache::getInstance()->getAnimation("runleft"))  );  
    }  
}

//敌人前进的动画
void EnemyBase::runFllowPoint()  
{  
    auto point = currPoint();  
    setPosition(point->getPosition());  
    point = nextPoint();     
    if( point!= NULL ){  
        runAction(CCSequence::create(MoveTo::create(getRunSpeed(), point->getPosition())  
                                        , CallFuncN::create(CC_CALLBACK_0(EnemyBase::runFllowPoint, this))  
                                        , NULL));  
    }  
}