TestCpp里面常用代码摘抄<重力感应和动作管理类>

一、保证pos的位置在min,max内

#define FIX_POS(_pos, _min, _max) \    if (_pos < _min)        \    _pos = _min;        \else if (_pos > _max)   \    _pos = _max;        \

用法，保证一个CCSprite在屏幕内。

    FIX_POS(ptNext.x, (VisibleRect::left().x+ballSize.width / 2.0), (VisibleRect::right().x - ballSize.width / 2.0));    FIX_POS(ptNext.y, (VisibleRect::bottom().y+ballSize.height / 2.0), (VisibleRect::top().y - ballSize.height / 2.0));

二、设置CCLayer层的onEnter里面设置重力感应。设置了重力感应。如果是PC，没有重力感应，就是用方向键控制。

void xxxLayer::onEnter(){    CCLayer::onEnter();    setAccelerometerEnabled(true);}

当重力感应方向变化时候，会调用

void AccelerometerTest::didAccelerate(CCAcceleration* pAccelerationValue){    CCPoint ptNow  = m_pBall->getPosition();    CCPoint ptTemp = pDir->convertToUI(ptNow);    ptTemp.x += pAccelerationValue->x * 9.81f;    ptTemp.y -= pAccelerationValue->y * 9.81f;    CCPoint ptNext = pDir->convertToGL(ptTemp);}

pAccelerationValue包含x,y,z三个方向的重力值。

三、removeChild删除子控件不奔溃的处理办法。

void CrashTest::onEnter(){    ActionManagerTest::onEnter();    CCSprite* child = CCSprite::create(s_pPathGrossini);    child->setPosition( VisibleRect::center() );    addChild(child, 1);    //Sum of all action's duration is 1.5 second.    child->runAction(CCRotateBy::create(1.5f, 90));    child->runAction(CCSequence::create(                                            CCDelayTime::create(1.4f),                                            CCFadeOut::create(1.1f),                                            NULL)                    );        //After 1.5 second, self will be removed.    runAction( CCSequence::create(                                    CCDelayTime::create(1.4f),                                    CCCallFunc::create(this, callfunc_selector(CrashTest::removeThis)),                                    NULL)             );}void CrashTest::removeThis(){    m_pParent->removeChild(this, true);}

四、addAction最后一个参数设为ture暂停动作，然后resumeTarget恢复动作，3秒后执行移动动作。

void PauseTest::onEnter(){    //    // This test MUST be done in 'onEnter' and not on 'init'    // otherwise the paused action will be resumed at 'onEnter' time    //    ActionManagerTest::onEnter();        CCLabelTTF* l = CCLabelTTF::create("After 5 seconds grossini should move", "Thonburi", 16);    addChild(l);    l->setPosition( ccp(VisibleRect::center().x, VisibleRect::top().y-75) );            //    // Also, this test MUST be done, after [super onEnter]    //    CCSprite* grossini = CCSprite::create(s_pPathGrossini);    addChild(grossini, 0, kTagGrossini);    grossini->setPosition(VisibleRect::center() );        CCAction* action = CCMoveBy::create(1, ccp(150,0));    CCDirector* pDirector = CCDirector::sharedDirector();    pDirector->getActionManager()->addAction(action, grossini, true);    schedule( schedule_selector(PauseTest::unpause), 3); }void PauseTest::unpause(float dt){    unschedule( schedule_selector(PauseTest::unpause) );    CCNode* node = getChildByTag( kTagGrossini );    CCDirector* pDirector = CCDirector::sharedDirector();    pDirector->getActionManager()->resumeTarget(node);}

五、停止动作stopActionByTag。特别注意的是动作和CCSprite加了标志，比如setTag(kTagSequence)方便以后查找。下面代码是先用getChildByTab(kTagGrossini)获取节点。然后stopActionByTay(kTagSequence);

void RemoveTest::onEnter(){    ActionManagerTest::onEnter();    CCMoveBy* pMove = CCMoveBy::create(2, ccp(200, 0));    CCCallFunc* pCallback = CCCallFunc::create(this, callfunc_selector(RemoveTest::stopAction));    CCActionInterval* pSequence = CCSequence::create(pMove, pCallback, NULL);    pSequence->setTag(kTagSequence);    CCSprite* pChild = CCSprite::create(s_pPathGrossini);    pChild->setPosition( VisibleRect::center() );    addChild(pChild, 1, kTagGrossini);    pChild->runAction(pSequence);}void RemoveTest::stopAction(){    CCNode* pSprite = getChildByTag(kTagGrossini);    pSprite->stopActionByTag(kTagSequence);}

六、先暂停动作，然后pauseTager，然后runAction一个动作，这样resumeTager的话，就可以同时执行2个动作了。

void ResumeTest::onEnter(){    ActionManagerTest::onEnter();    CCSprite* pGrossini = CCSprite::create(s_pPathGrossini);    addChild(pGrossini, 0, kTagGrossini);    pGrossini->setPosition(VisibleRect::center());    pGrossini->runAction(CCScaleBy::create(2, 2));    CCDirector* pDirector = CCDirector::sharedDirector();    pDirector->getActionManager()->pauseTarget(pGrossini);    pGrossini->runAction(CCRotateBy::create(2, 360));    this->schedule(schedule_selector(ResumeTest::resumeGrossini), 3.0f);}void ResumeTest::resumeGrossini(float time){    this->unschedule(schedule_selector(ResumeTest::resumeGrossini));    CCNode* pGrossini = getChildByTag(kTagGrossini);    CCDirector* pDirector = CCDirector::sharedDirector();    pDirector->getActionManager()->resumeTarget(pGrossini);}

参考资料:cocos2d-x基础知识（四） 简单菜单及坐标系