RunAction测试

源码:

//看看runAction

CCAction * CCNode::runAction(CCAction* action)

{

    CCAssert( action !=NULL, "Argument must be non-nil");

    m_pActionManager->addAction(action,this, !m_bRunning); //往ActionManager加入了该动作

    return action;

}

//看看ActionManager是做什么.....

void CCActionManager::addAction(CCAction *pAction,CCNode *pTarget, bool paused)

{

    CCAssert(pAction != NULL,"");

    CCAssert(pTarget != NULL,"");

    tHashElement *pElement = NULL;

    // we should convert it to CCObject*, because we save it as CCObject*

    CCObject *tmp = pTarget;

    HASH_FIND_INT(m_pTargets, &tmp, pElement);

    if (! pElement)

    {

        pElement = (tHashElement*)calloc(sizeof(*pElement),1);

        pElement->paused = paused;

        pTarget->retain();

        pElement->target = pTarget;

        HASH_ADD_INT(m_pTargets,target, pElement);

    }

     actionAllocWithHashElement(pElement);

 

     CCAssert(! ccArrayContainsObject(pElement->actions, pAction),"");

     ccArrayAppendObject(pElement->actions, pAction);

 

     pAction->startWithTarget(pTarget);     //执行动作

}

只要runAction 马上就会执行该动作, 与其他动作同时执行, 所以可能会产生预想不到的效果, 建议runAction前最好是stopAction先.

 //这段代码可以看出, moveBy2先执行完,而moveBy其实也是同时执行的(比较隐形)

CCActionInterval *moveBy = CCMoveBy::create(20, ccp(-size.width/2,-size.height/2));

CCActionInterval *moveBy2 = CCMoveBy::create(2, ccp(size.width/2,size.height/2));

CCSprite *spx = CCSprite::create("HelloWorld.png");

spx->setPosition(CCPointZero);

spx->runAction(moveBy);

spx->runAction(moveBy2);

this->addChild(spx);

  

//修改了moveBy时间, 发现图片不动, 说明runAction可以同时执行多个动作

CCActionInterval *moveBy = CCMoveBy::create(2, ccp(-size.width/2,-size.height/2));

CCActionInterval *moveBy2 = CCMoveBy::create(2, ccp(size.width/2,size.height/2));

CCSprite *spx = CCSprite::create("HelloWorld.png");

spx->setPosition(CCPointZero);

spx->runAction(moveBy);

spx->runAction(moveBy2);

this->addChild(spx);