axmol/cocos2dx/actions/CCAction.h

/****************************************************************************
Copyright (c) 2010-2012 cocos2d-x.org
Copyright (c) 2008-2010 Ricardo Quesada
Copyright (c) 2011      Zynga Inc.

http://www.cocos2d-x.org

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****************************************************************************/

#ifndef __ACTIONS_CCACTION_H__
#define __ACTIONS_CCACTION_H__

#include "CCObject.h"
#include "CCGeometry.h"

NS_CC_BEGIN

enum {
    //! Default tag
    kCCActionTagInvalid = -1,
};

/** 
@brief Base class for CCAction objects.
 */
class CC_DLL CCAction : public CCObject 
{
public:
    CCAction(void);
    virtual ~CCAction(void);

    const char* description();

    virtual CCObject* copyWithZone(CCZone *pZone);

    //! return true if the action has finished
    virtual bool isDone(void);

    //! called before the action start. It will also set the target.
    virtual void startWithTarget(CCNode *pTarget);

    /** 
    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(void);

    //! called every frame with it's delta time. DON'T override unless you know what you are doing.
    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
    */
    virtual void update(float time);
    
    inline CCNode* getTarget(void) { return m_pTarget; }
    /** The action will modify the target properties. */
    inline void setTarget(CCNode *pTarget) { m_pTarget = pTarget; }
    
    inline CCNode* getOriginalTarget(void) { return m_pOriginalTarget; } 
    /** 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 CCActionManager, you should NOT call this method.
    The target is 'assigned', it is not 'retained'.
    @since v0.8.2
    */
    inline void setOriginalTarget(CCNode *pOriginalTarget) { m_pOriginalTarget = pOriginalTarget; }

    inline int getTag(void) { return m_nTag; }
    inline void setTag(int nTag) { m_nTag = nTag; }

public:
    /** Allocates and initializes the action 
    @warning: This interface will be deprecated in future.
    */
    static CCAction* action();

    /** Create an action */
    static CCAction* create();
protected:
    CCNode    *m_pOriginalTarget;
    /** 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'.
    */
    CCNode    *m_pTarget;
    /** The action tag. An identifier of the action */
    int     m_nTag;
};

/** 
@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 CCFiniteTimeAction : public CCAction
{
public:
    CCFiniteTimeAction()
        : m_fDuration(0)
    {}
    virtual ~CCFiniteTimeAction(){}
    //! get duration in seconds of the action
    inline float getDuration(void) { return m_fDuration; }
    //! set duration in seconds of the action
    inline void setDuration(float duration) { m_fDuration = duration; }

    /** returns a reversed action */
    virtual CCFiniteTimeAction* reverse(void);
protected:
    //! duration in seconds
    float m_fDuration;
};

class CCActionInterval;
class CCRepeatForever;

/** 
 @brief Changes the speed of an action, making it take longer (speed>1)
 or less (speed<1) time.
 Useful to simulate 'slow motion' or 'fast forward' effect.
 @warning This action can't be Sequenceable because it is not an CCIntervalAction
 */
class CC_DLL CCSpeed : public CCAction
{
public:
    CCSpeed()
        : m_fSpeed(0.0)
        , m_pInnerAction(NULL)
    {}
    virtual ~CCSpeed(void);

    inline float getSpeed(void) { return m_fSpeed; }
    /** alter the speed of the inner function in runtime */
    inline void setSpeed(float fSpeed) { m_fSpeed = fSpeed; }

    /** initializes the action */
    bool initWithAction(CCActionInterval *pAction, float fSpeed);

    virtual CCObject* copyWithZone(CCZone *pZone);
    virtual void startWithTarget(CCNode* pTarget);
    virtual void stop();
    virtual void step(float dt);
    virtual bool isDone(void);
    virtual CCActionInterval* reverse(void);

    void setInnerAction(CCActionInterval *pAction);

    inline CCActionInterval* getInnerAction()
    {
        return m_pInnerAction;
    }

public:
    /** creates the action 
    @warning: This interface will be deprecated in future.
    */
    static CCSpeed* actionWithAction(CCActionInterval *pAction, float fSpeed);
    
    /** create the action */
    static CCSpeed* create(CCActionInterval* pAction, float fSpeed);
protected:
    float m_fSpeed;
    CCActionInterval *m_pInnerAction;
};

/** 
@brief CCFollow is an action that "follows" a node.

Eg:
layer->runAction(CCFollow::actionWithTarget(hero));

Instead of using CCCamera as a "follower", use this action instead.
@since v0.99.2
*/
class CC_DLL CCFollow : public CCAction
{
public:
    CCFollow()
        : m_pobFollowedNode(NULL)
        , m_bBoundarySet(false)
        , m_bBoundaryFullyCovered(false)        
        , m_fLeftBoundary(0.0)
        , m_fRightBoundary(0.0)
        , m_fTopBoundary(0.0)
        , m_fBottomBoundary(0.0)
    {}
    virtual ~CCFollow(void);
    
    inline bool isBoundarySet(void) { return m_bBoundarySet; }
    /** alter behavior - turn on/off boundary */
    inline void setBoudarySet(bool bValue) { m_bBoundarySet = bValue; }

    /** initializes the action with a set boundary */
    bool initWithTarget(CCNode *pFollowedNode, const CCRect& rect = CCRectZero);

    virtual CCObject* copyWithZone(CCZone *pZone);
    virtual void step(float dt);
    virtual bool isDone(void);
    virtual void stop(void);

public:
    /** creates the action with a set boundary,
        It will work with no boundary if @param rect is equal to CCRectZero.
    @warning: This interface will be deprecated in future.
    */
    static CCFollow* actionWithTarget(CCNode *pFollowedNode, const CCRect& rect = CCRectZero);
    /** creates the action with a set boundary,
    It will work with no boundary if @param rect is equal to CCRectZero.
    */
    static CCFollow* create(CCNode *pFollowedNode, const CCRect& rect = CCRectZero);
protected:
    // node to follow
    CCNode *m_pobFollowedNode;

    // whether camera should be limited to certain area
    bool m_bBoundarySet;

    // if screen size is bigger than the boundary - update not needed
    bool m_bBoundaryFullyCovered;

    // fast access to the screen dimensions
    CCPoint m_obHalfScreenSize;
    CCPoint m_obFullScreenSize;

    // world boundaries
    float m_fLeftBoundary;
    float m_fRightBoundary;
    float m_fTopBoundary;
    float m_fBottomBoundary;
};

NS_CC_END

#endif // __ACTIONS_CCACTION_H__