axmol/cocos2dx/actions/CCActionTween.h

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Copyright (c) 2010-2012 cocos2d-x.org
Copyright 2009 lhunath (Maarten Billemont)

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#ifndef __CCACTIONTWEEN_H__
#define __CCACTIONTWEEN_H__

#include "CCActionInterval.h"

NS_CC_BEGIN

/**
 * @addtogroup actions
 * @{
 */

class CC_DLL ActionTweenDelegate
{
public:
    virtual ~ActionTweenDelegate() {}
    virtual void updateTweenAction(float value, const char* key) = 0;
};

/** ActionTween

 ActionTween is an action that lets you update any property of an object.
 For example, if you want to modify the "width" property of a target from 200 to 300 in 2 seconds, then:

    id modifyWidth = [ActionTween actionWithDuration:2 key:@"width" from:200 to:300];
    [target runAction:modifyWidth];


 Another example: ScaleTo action could be rewritten using PropertyAction:

    // scaleA and scaleB are equivalents
    id scaleA = [ScaleTo actionWithDuration:2 scale:3];
    id scaleB = [ActionTween actionWithDuration:2 key:@"scale" from:1 to:3];


 @since v0.99.2
 */
class CC_DLL ActionTween : public ActionInterval
{
public:
    /** creates an initializes the action with the property name (key), and the from and to parameters. */
    static ActionTween* create(float duration, const char* key, float from, float to);
    /** initializes the action with the property name (key), and the from and to parameters. */
    bool initWithDuration(float duration, const char* key, float from, float to);

    // Overrides
    void startWithTarget(Node *target) override;
    void update(float dt) override;
    ActionTween* reverse() const override;
	ActionTween *clone() const override;

protected:
    std::string        _key;
    float            _from, _to;
    float            _delta;
};

// end of actions group
/// @}

NS_CC_END

#endif /* __CCACTIONTWEEN_H__ */