CCFollow和ActionCallFunc

CCFollow动作，可以让一个节点跟随另一个节点做位移。

CCFollow经常用来设置layer跟随sprite，可以实现类似摄像机跟拍的效果

效果是精灵在地图上移动，地图也会跟着移动，但是精灵仍然是在整个界面的中心位置

CCSize s = CCDirector::sharedDirector()->getWinSize();
        pSprite->setPosition(ccp(-200, s.height / 2));
        CCActionInterval* move      = CCMoveBy::create(2, ccp(s.width * 3, 0));
        CCActionInterval* move_back = move->reverse();
        CCFiniteTimeAction* seq       = CCSequence::create(move, move_back, NULL);
        CCAction* rep               = CCRepeatForever::create((CCActionInterval*)seq);

        pSprite->runAction(rep);

        this->runAction(CCFollow::create(pSprite, CCRectMake(0, 0, s.width * 2 - 100, s.height)));

//三个动作都绑定一个函数，三个动作同时执行，执行完后响应函数

void ActionCallFunc::onEnter()
{
    ActionsDemo::onEnter();

    centerSprites(3);

    CCFiniteTimeAction*  action = CCSequence::create(
        CCMoveBy::create(2, ccp(200,0)),
        CCCallFunc::create(this, callfunc_selector(ActionCallFunc::callback1)), 
        NULL);

    CCFiniteTimeAction*  action2 = CCSequence::create(
        CCScaleBy::create(2 ,  2),
        CCFadeOut::create(2),
        CCCallFuncN::create(this, callfuncN_selector(ActionSequence2::callback2)), 
        NULL);

    CCFiniteTimeAction*  action3 = CCSequence::create(
        CCRotateBy::create(3 , 360),
        CCFadeOut::create(2),
        CCCallFuncND::create(this, callfuncND_selector(ActionSequence2::callback3), (void*)0xbebabeba), 
        NULL);

    m_grossini->runAction(action);
    m_tamara->runAction(action2);
    m_kathia->runAction(action3);
}


void ActionCallFunc::callback1()
{
    CCSize s = CCDirector::sharedDirector()->getWinSize();
    CCLabelTTF *label = CCLabelTTF::create("callback 1 called", "Marker Felt", 16);
    label->setPosition(ccp( s.width/4*1,s.height/2));

    addChild(label);
}

void ActionCallFunc::callback2(CCNode* pSender)
{
    CCSize s = CCDirector::sharedDirector()->getWinSize();
    CCLabelTTF *label = CCLabelTTF::create("callback 2 called", "Marker Felt", 16);
    label->setPosition(ccp( s.width/4*2,s.height/2));

    addChild(label);
}

void ActionCallFunc::callback3(CCNode* pTarget, void* data)
{
    CCSize s = CCDirector::sharedDirector()->getWinSize();
    CCLabelTTF *label = CCLabelTTF::create("callback 3 called", "Marker Felt", 16);
    label->setPosition(ccp( s.width/4*3,s.height/2));
    addChild(label);
}