axmol/cocos/2d/CCActionTween.cpp

/****************************************************************************
Copyright (c) 2009      lhunath (Maarten Billemont)
Copyright (c) 2010-2012 cocos2d-x.org
Copyright (c) 2013-2016 Chukong Technologies Inc.
Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.

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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#include "2d/CCActionTween.h"

NS_CC_BEGIN

ActionTween* ActionTween::create(float duration, std::string_view key, float from, float to)
{
    ActionTween* ret = new ActionTween();
    if (ret->initWithDuration(duration, key, from, to))
    {
        ret->autorelease();
        return ret;
    }

    delete ret;
    return nullptr;
}

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

    return false;
}

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

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);
}

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

NS_CC_END