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 // Created by: Anastasia BORISOVA
 // Copyright (c) 2016 OPEN CASCADE SAS
 //
 // This file is part of Open CASCADE Technology software library.
 //
 // This library is free software; you can redistribute it and/or modify it under
 // the terms of the GNU Lesser General Public License version 2.1 as published
 // by the Free Software Foundation, with special exception defined in the file
 // OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
 // distribution for complete text of the license and disclaimer of any warranty.
 //
 // Alternatively, this file may be used under the terms of Open CASCADE
 // commercial license or contractual agreement.
 
 #ifndef _AIS_Animation_HeaderFile
 #define _AIS_Animation_HeaderFile
 
 #include <AIS_AnimationTimer.hxx>
 #include <NCollection_Sequence.hxx>
 #include <TCollection_AsciiString.hxx>
 
 //! Structure defining current animation progress.
 struct AIS_AnimationProgress
 {
   Standard_Real Pts;             //!< global presentation timestamp
   Standard_Real LocalPts;        //!< presentation within current animation
   Standard_Real LocalNormalized; //!< normalized position within current animation within 0..1 range
 
   AIS_AnimationProgress() : Pts (-1.0), LocalPts (-1.0), LocalNormalized (-1.0) {}
 };
 
 DEFINE_STANDARD_HANDLE(AIS_Animation, Standard_Transient)
 
 //! Class represents a basic animation class.
 //! AIS_Animation can be used as:
 //!
 //! - Animation Implementor
 //!   Sub-classes should override method AIS_Animation::update() to perform specific animation.
 //!   AIS package provides limited number of such animation atoms - classes AIS_AnimationObject and AIS_AnimationCamera, which could be enough for defining a simple animation.
 //!   In general case, application is expected defining own AIS_Animation sub-classes implementing application-specific animation logic
 //!   (e.g. another interpolation or another kind of transformations - like color transition and others).
 //!   The basic conception of AIS_Animation::update() is defining an exact scene state for the current presentation timestamp,
 //!   providing a smooth and continuous animation well defined at any time step and in any direction.
 //!   So that a time difference between two sequential drawn Viewer frames can vary from frame to frame without visual artifacts,
 //!   increasing rendering framerate would not lead to animation being executed too fast
 //!   and low framerate (on slow hardware) would not lead to animation played longer than defined duration.
 //!   Hence, implementation should avoid usage of incremental step logic or should apply it very carefully.
 //!
 //! - Animation Container
 //!   AIS_Animation (no sub-classing) can be used to aggregate a sequence of Animation items (children).
 //!   Each children should be defined with its own duration and start time (presentation timestamp).
 //!   It is possible defining collection of nested AIS_Animation items, so that within each container level
 //!   children define start playback time relative to its holder.
 //!
 //! - Animation playback Controller
 //!   It is suggested that application would define a single AIS_Animation instance (optional sub-classing) for controlling animation playback as whole.
 //!   Such controller should be filled in by other AIS_Animation as children objects,
 //!   and will be managed by application by calling StartTimer(), UpdateTimer() and IsStopped() methods.
 //!
 //! Note, that AIS_Animation::StartTimer() defines a timer calculating an elapsed time, not a multimedia timer executing Viewer updates at specific intervals!
 //! Application should avoid using implicit and immediate Viewer updates to ensure that AIS_Animation::UpdateTimer() is called before each redrawing of a Viewer content.
 //! Redrawing logic should be also managed at application level for managing a smooth animation
 //! (by defining a multimedia timer provided by used GUI framework executing updates at desired framerate, or as continuous redraws in loop).
 class AIS_Animation : public Standard_Transient
 {
   DEFINE_STANDARD_RTTIEXT(AIS_Animation, Standard_Transient)
 public:
 
   //! Creates empty animation.
   Standard_EXPORT AIS_Animation (const TCollection_AsciiString& theAnimationName);
 
   //! Destruct object, clear arguments
   Standard_EXPORT virtual ~AIS_Animation();
 
   //! Animation name.
   const TCollection_AsciiString& Name() const { return myName; }
 
 public:
 
   //! @return start time of the animation in the timeline
   Standard_Real StartPts() const { return myPtsStart; }
 
   //! Sets time limits for animation in the animation timeline
   void SetStartPts (const Standard_Real thePtsStart) { myPtsStart = thePtsStart; }
 
   //! @return duration of the animation in the timeline
   Standard_Real Duration() const { return Max (myOwnDuration, myChildrenDuration); }
 
   //! Update total duration considering all animations on timeline.
   Standard_EXPORT void UpdateTotalDuration();
 
   //! Return true if duration is defined.
   Standard_Boolean HasOwnDuration() const { return myOwnDuration > 0.0; }
 
   //! @return own duration of the animation in the timeline
   Standard_Real OwnDuration() const { return myOwnDuration; }
 
   //! Defines duration of the animation.
   void SetOwnDuration (const Standard_Real theDuration) { myOwnDuration = theDuration; }
 
   //! Add single animation to the timeline.
   //! @param theAnimation input animation
   Standard_EXPORT void Add (const Handle(AIS_Animation)& theAnimation);
 
   //! Clear animation timeline - remove all animations from it.
   Standard_EXPORT void Clear();
 
   //! Return the child animation with the given name.
   Standard_EXPORT Handle(AIS_Animation) Find (const TCollection_AsciiString& theAnimationName) const;
 
   //! Remove the child animation.
   Standard_EXPORT Standard_Boolean Remove (const Handle(AIS_Animation)& theAnimation);
 
   //! Replace the child animation.
   Standard_EXPORT Standard_Boolean Replace (const Handle(AIS_Animation)& theAnimationOld,
                                             const Handle(AIS_Animation)& theAnimationNew);
 
   //! Clears own children and then copy child animations from another object.
   //! Copy also Start Time and Duration values.
   Standard_EXPORT void CopyFrom (const Handle(AIS_Animation)& theOther);
 
   //! Return sequence of child animations.
   const NCollection_Sequence<Handle(AIS_Animation)>& Children() const { return myAnimations; }
 
 public:
 
   //! Start animation with internally defined timer instance.
   //! Calls ::Start() internally.
   //!
   //! Note, that this method initializes a timer calculating an elapsed time (presentation timestamps within AIS_Animation::UpdateTimer()),
   //! not a multimedia timer executing Viewer updates at specific intervals!
   //! Viewer redrawing should be managed at application level, so that AIS_Animation::UpdateTimer() is called once right before each redrawing of a Viewer content.
   //!
   //! @param theStartPts    starting timer position (presentation timestamp)
   //! @param thePlaySpeed   playback speed (1.0 means normal speed)
   //! @param theToUpdate    flag to update defined animations to specified start position
   //! @param theToStopTimer flag to pause timer at the starting position
   Standard_EXPORT virtual void StartTimer (const Standard_Real    theStartPts,
                                            const Standard_Real    thePlaySpeed,
                                            const Standard_Boolean theToUpdate,
                                            const Standard_Boolean theToStopTimer = Standard_False);
 
   //! Update single frame of animation, update timer state
   //! @return current time of timeline progress.
   Standard_EXPORT virtual Standard_Real UpdateTimer();
 
   //! Return elapsed time.
   Standard_Real ElapsedTime() const { return !myTimer.IsNull() ? myTimer->ElapsedTime() : 0.0; }
 
   //! Return playback timer.
   const Handle(Media_Timer)& Timer() const { return myTimer; }
 
   //! Set playback timer.
   void SetTimer (const Handle(Media_Timer)& theTimer) { myTimer = theTimer; }
 
 public:
 
   //! Start animation. This method changes status of the animation to Started.
   //! This status defines whether animation is to be performed in the timeline or not.
   //! @param theToUpdate call Update() method
   Standard_EXPORT virtual void Start (const Standard_Boolean theToUpdate);
 
   //! Pause the process timeline.
   Standard_EXPORT virtual void Pause();
 
   //! Stop animation. This method changed status of the animation to Stopped.
   //! This status shows that animation will not be performed in the timeline or it is finished.
   Standard_EXPORT virtual void Stop();
 
   //! Check if animation is to be performed in the animation timeline.
   //! @return True if it is stopped of finished.
   bool IsStopped() { return myState != AnimationState_Started; }
 
   //! Update single frame of animation, update timer state
   //! @param thePts [in] the time moment within [0; Duration()]
   //! @return True if timeline is in progress
   Standard_EXPORT virtual Standard_Boolean Update (const Standard_Real thePts);
 
 protected:
 
   //! Process one step of the animation according to the input time progress, including all children.
   //! Calls also ::update() to update own animation.
   Standard_EXPORT virtual void updateWithChildren (const AIS_AnimationProgress& thePosition);
 
   //! Update the own animation to specified position - should be overridden by sub-class.
   virtual void update (const AIS_AnimationProgress& theProgress) { (void )theProgress; }
 
 protected:
 
   //! Defines animation state.
   enum AnimationState
   {
     AnimationState_Started, //!< animation is in progress
     AnimationState_Stopped, //!< animation is finished, force stopped or not started
     AnimationState_Paused   //!< animation is paused and can be started from the pause moment
   };
 
 protected:
 
   Handle(Media_Timer) myTimer;
 
   TCollection_AsciiString myName;           //!< animation name
   NCollection_Sequence<Handle(AIS_Animation)>
                         myAnimations;       //!< sequence of child animations
 
   AnimationState        myState;            //!< animation state - started, stopped of paused
   Standard_Real         myPtsStart;         //!< time of start in the timeline
   Standard_Real         myOwnDuration;      //!< duration of animation excluding children
   Standard_Real         myChildrenDuration; //!< duration of animation including children
 
 };
 
 #endif // _AIS_Animation_HeaderFile

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