axmol/cocos/2d/CCActionTween.cpp

/****************************************************************************
Copyright (c) 2009      lhunath (Maarten Billemont)
Copyright (c) 2010-2012 cocos2d-x.org
CopyRight (c) 2013-2014 Chukong Technologies Inc.
 
http://www.cocos2d-x.org

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The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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****************************************************************************/

#include "2d/CCActionTween.h"

NS_CC_BEGIN

ActionTween* ActionTween::create(float aDuration, const std::string& key, float from, float to)
{
    ActionTween* ret = new ActionTween();
    if (ret && ret->initWithDuration(aDuration, key, from, to))
    {
        ret->autorelease();
    }
    else
    {
        CC_SAFE_DELETE(ret);
    }
    return ret;
}

bool ActionTween::initWithDuration(float duration, const std::string& key, float from, float to)
{
    if (ActionInterval::initWithDuration(duration))
    {
        _key    = key;
        _to       = to;
        _from     = from;
        return true;
    }

    return false;
}

ActionTween *ActionTween::clone() const
{
	// no copy constructor	
	auto a = new ActionTween();
	a->initWithDuration(_duration, _key.c_str(), _from, _to);
	a->autorelease();
	return a;
}

void ActionTween::startWithTarget(Node *target)
{
    CCASSERT(dynamic_cast<ActionTweenDelegate*>(target), "target must implement ActionTweenDelegate");
    ActionInterval::startWithTarget(target);
    _delta = _to - _from;
}

void ActionTween::update(float dt)
{
    dynamic_cast<ActionTweenDelegate*>(_target)->updateTweenAction(_to  - _delta * (1 - dt), _key.c_str());
}

ActionTween* ActionTween::reverse() const
{
    return ActionTween::create(_duration, _key.c_str(), _to, _from);
}


NS_CC_END