axmol/cocos/2d/CCAction.h

/****************************************************************************
Copyright (c) 2008-2010 Ricardo Quesada
Copyright (c) 2010-2012 cocos2d-x.org
Copyright (c) 2011      Zynga Inc.
Copyright (c) 2013-2016 Chukong Technologies Inc.
Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.

http://www.cocos2d-x.org

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#ifndef __ACTIONS_CCACTION_H__
#define __ACTIONS_CCACTION_H__

#include "base/CCRef.h"
#include "math/CCMath.h"
#include "base/CCScriptSupport.h"

NS_CC_BEGIN

class Node;

enum
{
    kActionUpdate
};

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

/**
 * @brief Base class for Action objects.
 */
class CC_DLL Action : public Ref, public Clonable
{
public:
    /** Default tag used for all the actions. */
    static const int INVALID_TAG = -1;
    /**
     * @js NA
     * @lua NA
     */
    virtual std::string description() const;

    /** Returns a clone of action.
     *
     * @return A clone action.
     */
    virtual Action* clone() const
    {
        CC_ASSERT(0);
        return nullptr;
    }

    /** Returns a new action that performs the exact reverse of the action.
     *
     * @return A new action that performs the exact reverse of the action.
     * @js NA
     */
    virtual Action* reverse() const
    {
        CC_ASSERT(0);
        return nullptr;
    }

    /** Return true if the action has finished.
     *
     * @return Is true if the action has finished.
     */
    virtual bool isDone() const;

    /** Called before the action start. It will also set the target.
     *
     * @param target A certain target.
     */
    virtual void startWithTarget(Node* target);

    /**
     * Called after the action has finished. It will set the 'target' to nil.
     * IMPORTANT: You should never call "Action::stop()" manually. Instead, use: "target->stopAction(action);".
     */
    virtual void stop();

    /** Called every frame with it's delta time, dt in seconds. DON'T override unless you know what you are doing.
     *
     * @param dt In seconds.
     */
    virtual void step(float dt);

    /**
     * Called once per frame. time a value between 0 and 1.

     * For example:
     * - 0 Means that the action just started.
     * - 0.5 Means that the action is in the middle.
     * - 1 Means that the action is over.
     *
     * @param time A value between 0 and 1.
     */
    virtual void update(float time);
    /** Return certain target.
     *
     * @return A certain target.
     */
    Node* getTarget() const { return _target; }
    /** The action will modify the target properties.
     *
     * @param target A certain target.
     */
    void setTarget(Node* target) { _target = target; }
    /** Return a original Target.
     *
     * @return A original Target.
     */
    Node* getOriginalTarget() const { return _originalTarget; }
    /**
     * Set the original target, since target can be nil.
     * Is the target that were used to run the action. Unless you are doing something complex, like ActionManager, you
     * should NOT call this method. The target is 'assigned', it is not 'retained'.
     * @since v0.8.2
     *
     * @param originalTarget Is 'assigned', it is not 'retained'.
     */
    void setOriginalTarget(Node* originalTarget) { _originalTarget = originalTarget; }
    /** Returns a tag that is used to identify the action easily.
     *
     * @return A tag.
     */
    int getTag() const { return _tag; }
    /** Changes the tag that is used to identify the action easily.
     *
     * @param tag Used to identify the action easily.
     */
    void setTag(int tag) { _tag = tag; }
    /** Returns a flag field that is used to group the actions easily.
     *
     * @return A tag.
     */
    unsigned int getFlags() const { return _flags; }
    /** Changes the flag field that is used to group the actions easily.
     *
     * @param flags Used to group the actions easily.
     */
    void setFlags(unsigned int flags) { _flags = flags; }

    CC_CONSTRUCTOR_ACCESS : Action();
    virtual ~Action();

protected:
    Node* _originalTarget;
    /**
     * The "target".
     * The target will be set with the 'startWithTarget' method.
     * When the 'stop' method is called, target will be set to nil.
     * The target is 'assigned', it is not 'retained'.
     */
    Node* _target;
    /** The action tag. An identifier of the action. */
    int _tag;
    /** The action flag field. To categorize action into certain groups.*/
    unsigned int _flags;

private:
    CC_DISALLOW_COPY_AND_ASSIGN(Action);
};

/** @class FiniteTimeAction
 * @brief
 * Base class actions that do have a finite time duration.
 * Possible actions:
 * - An action with a duration of 0 seconds.
 * - An action with a duration of 35.5 seconds.
 * Infinite time actions are valid.
 */
class CC_DLL FiniteTimeAction : public Action
{
public:
    /** Get duration in seconds of the action.
     *
     * @return The duration in seconds of the action.
     */
    float getDuration() const { return _duration; }
    /** Set duration in seconds of the action.
     *
     * @param duration In seconds of the action.
     */
    void setDuration(float duration) { _duration = duration; }

    //
    // Overrides
    //
    virtual FiniteTimeAction* reverse() const override
    {
        CC_ASSERT(0);
        return nullptr;
    }
    virtual FiniteTimeAction* clone() const override
    {
        CC_ASSERT(0);
        return nullptr;
    }

    CC_CONSTRUCTOR_ACCESS : FiniteTimeAction() : _duration(0) {}
    virtual ~FiniteTimeAction() {}

protected:
    //! Duration in seconds.
    float _duration;

private:
    CC_DISALLOW_COPY_AND_ASSIGN(FiniteTimeAction);
};

class ActionInterval;
class RepeatForever;

/** @class Speed
 * @brief Changes the speed of an action, making it take longer (speed>1)
 * or shorter (speed<1) time.
 * Useful to simulate 'slow motion' or 'fast forward' effect.
 * @warning This action can't be Sequenceable because it is not an IntervalAction.
 */
class CC_DLL Speed : public Action
{
public:
    /** Create the action and set the speed.
     *
     * @param action An action.
     * @param speed The action speed.
     */
    static Speed* create(ActionInterval* action, float speed);
    /** Return the speed.
     *
     * @return The action speed.
     */
    float getSpeed() const { return _speed; }
    /** Alter the speed of the inner function in runtime.
     *
     * @param speed Alter the speed of the inner function in runtime.
     */
    void setSpeed(float speed) { _speed = speed; }

    /** Replace the interior action.
     *
     * @param action The new action, it will replace the running action.
     */
    void setInnerAction(ActionInterval* action);
    /** Return the interior action.
     *
     * @return The interior action.
     */
    ActionInterval* getInnerAction() const { return _innerAction; }

    //
    // Override
    //
    virtual Speed* clone() const override;
    virtual Speed* reverse() const override;
    virtual void startWithTarget(Node* target) override;
    virtual void stop() override;
    /**
     * @param dt in seconds.
     */
    virtual void step(float dt) override;
    /** Return true if the action has finished.
     *
     * @return Is true if the action has finished.
     */
    virtual bool isDone() const override;

    CC_CONSTRUCTOR_ACCESS : Speed();
    virtual ~Speed();
    /** Initializes the action. */
    bool initWithAction(ActionInterval* action, float speed);

protected:
    float _speed;
    ActionInterval* _innerAction;

private:
    CC_DISALLOW_COPY_AND_ASSIGN(Speed);
};

/** @class Follow
 * @brief Follow is an action that "follows" a node.
 * Eg:
 * @code
 * layer->runAction(Follow::create(hero));
 * @endcode
 * Instead of using Camera as a "follower", use this action instead.
 * @since v0.99.2
 */
class CC_DLL Follow : public Action
{
public:
    /**
     * Creates the action with a set boundary or with no boundary.
     *
     * @param followedNode  The node to be followed.
     * @param rect  The boundary. If \p rect is equal to Rect::ZERO, it'll work
     *              with no boundary.
     */

    static Follow* create(Node* followedNode, const Rect& rect = Rect::ZERO);

    /**
     * Creates the action with a set boundary or with no boundary with offsets.
     *
     * @param followedNode  The node to be followed.
     * @param rect  The boundary. If \p rect is equal to Rect::ZERO, it'll work
     *              with no boundary.
     * @param xOffset The horizontal offset from the center of the screen from which the
     *               node  is to be followed.It can be positive,negative or zero.If
     *               set to zero the node will be horizontally centered followed.
     *  @param yOffset The vertical offset from the center of the screen from which the
     *                 node is to be followed.It can be positive,negative or zero.
     *                 If set to zero the node will be vertically centered followed.
     *   If both xOffset and yOffset are set to zero,then the node will be horizontally and vertically centered
     * followed.
     */

    static Follow* createWithOffset(Node* followedNode, float xOffset, float yOffset, const Rect& rect = Rect::ZERO);

    /** Return boundarySet.
     *
     * @return Return boundarySet.
     */
    bool isBoundarySet() const { return _boundarySet; }
    /** Alter behavior - turn on/off boundary.
     *
     * @param value Turn on/off boundary.
     */
    void setBoundarySet(bool value) { _boundarySet = value; }

    //
    // Override
    //
    virtual Follow* clone() const override;
    virtual Follow* reverse() const override;
    /**
     * @param dt in seconds.
     * @js NA
     */
    virtual void step(float dt) override;
    virtual bool isDone() const override;
    virtual void stop() override;

    CC_CONSTRUCTOR_ACCESS :
        /**
         * @js ctor
         */
        Follow()
        : _followedNode(nullptr)
        , _boundarySet(false)
        , _boundaryFullyCovered(false)
        , _leftBoundary(0.0)
        , _rightBoundary(0.0)
        , _topBoundary(0.0)
        , _bottomBoundary(0.0)
        , _offsetX(0.0)
        , _offsetY(0.0)
        , _worldRect(Rect::ZERO)
    {}
    /**
     * @js NA
     * @lua NA
     */
    virtual ~Follow();

    /**
     * Initializes the action with a set boundary or with no boundary.
     *
     * @param followedNode  The node to be followed.
     * @param rect  The boundary. If \p rect is equal to Rect::ZERO, it'll work
     *              with no boundary.
     */
    bool initWithTarget(Node* followedNode, const Rect& rect = Rect::ZERO);

    /**
     * Initializes the action with a set boundary or with no boundary with offsets.
     *
     * @param followedNode  The node to be followed.
     * @param rect  The boundary. If \p rect is equal to Rect::ZERO, it'll work
     *              with no boundary.
     * @param xOffset The horizontal offset from the center of the screen from which the
     *                node  is to be followed.It can be positive,negative or zero.If
     *                set to zero the node will be horizontally centered followed.
     * @param yOffset The vertical offset from the center of the screen from which the
     *                node is to be followed.It can be positive,negative or zero.
     *                If set to zero the node will be vertically centered followed.
     *   If both xOffset and yOffset are set to zero,then the node will be horizontally and vertically centered
     followed.

     */
    bool initWithTargetAndOffset(Node* followedNode, float xOffset, float yOffset, const Rect& rect = Rect::ZERO);

protected:
    /** Node to follow. */
    Node* _followedNode;

    /** Whether camera should be limited to certain area. */
    bool _boundarySet;

    /** If screen size is bigger than the boundary - update not needed. */
    bool _boundaryFullyCovered;

    /** Fast access to the screen dimensions. */
    Vec2 _halfScreenSize;
    Vec2 _fullScreenSize;

    /** World boundaries. */
    float _leftBoundary;
    float _rightBoundary;
    float _topBoundary;
    float _bottomBoundary;

    /** Horizontal (x) and vertical (y) offset values. */
    float _offsetX;
    float _offsetY;

    Rect _worldRect;

private:
    CC_DISALLOW_COPY_AND_ASSIGN(Follow);
};

// end of actions group
/// @}

NS_CC_END

#endif  // __ACTIONS_CCACTION_H__