axmol/cocos2dx/actions/CCActionTween.cpp

/****************************************************************************
Copyright (c) 2010-2011 cocos2d-x.org
Copyright 2009 lhunath (Maarten Billemont)

http://www.cocos2d-x.org

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
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all copies or substantial portions of the Software.

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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
****************************************************************************/

#include "CCActionTween.h"

NS_CC_BEGIN

CCActionTween* CCActionTween::actionWithDuration(ccTime aDuration, const char* key, float from, float to)
{
    CCActionTween* pRet = new CCActionTween();
    if (pRet && pRet->initWithDuration(aDuration, key, from, to))
    {
        pRet->autorelease();
    }
    else
    {
        CC_SAFE_DELETE(pRet);
    }
    return pRet;
}

bool CCActionTween::initWithDuration(ccTime aDuration, const char* key, float from, float to)
{
    if (CCActionInterval::initWithDuration(aDuration)) 
    {
		m_strKey    = key;
		m_fTo       = to;
		m_fFrom     = from;
        return true;
	}

	return false;
}

void CCActionTween::startWithTarget(CCNode *pTarget)
{
    CCAssert(dynamic_cast<CCActionTweenDelegate*>(pTarget), "target must implement CCActionTweenDelegate");
    CCActionInterval::startWithTarget(pTarget);
	m_fDelta = m_fTo - m_fFrom;
}

void CCActionTween::update(ccTime dt)
{
    dynamic_cast<CCActionTweenDelegate*>(m_pTarget)->updateTweenAction(m_fTo  - m_fDelta * (1 - dt), m_strKey.c_str());
}

CCActionInterval* CCActionTween::reverse()
{
    return CCActionTween::actionWithDuration(m_fDuration, m_strKey.c_str(), m_fTo, m_fFrom);
}


NS_CC_END