// -*-c++-*-

//C++ header - Open Scene Graph - Copyright (C) 1998-2002 Robert Osfield
//Distributed under the terms of the GNU Library General Public License (LGPL)
//as published by the Free Software Foundation.

#ifndef OSG_SEQUENCE
#define OSG_SEQUENCE 1

#include <osg/Switch>

namespace osg {

/** Sequence is a Group node which allows automatic, time based
    switching between children.
*/
class SG_EXPORT Sequence : public Switch
{
public :
        
    Sequence();

    /** Copy constructor using CopyOp to manage deep vs shallow copy.*/
    Sequence(const Sequence&, const CopyOp& copyop=CopyOp::SHALLOW_COPY);

    META_Node(osg, Sequence);

    virtual void traverse(NodeVisitor& nv);

    /** Set time in seconds for child */
    void setTime(int frame, float t);

    /** Get time for child */
    float getTime(int frame) const;

    /** Interval modes */
    enum LoopMode
    {
        LOOP,
        SWING
    };

    /** Set sequence mode & interval. */
    void setInterval(LoopMode mode, int begin, int end);

    /** Get sequence mode & interval. */
    inline void getInterval(LoopMode& mode, int& begin, int& end) const
    {
        mode = _loopMode;
        begin = _begin;
        end = _end;
    }

    /** Set duration: speed-up & number of repeats */
    void setDuration(float speed, int nreps = -1);

    /** Get duration */
    inline void getDuration(float& speed, int& nreps) const
    {
        speed = _speed;
        nreps = _nreps;
    }

    /** Sequence modes */
    enum SequenceMode
    {
        START,
        STOP,
        PAUSE,
        RESUME
    };

    /** Set sequence mode. Start/stop & pause/resume. */
    void setMode(SequenceMode mode);

    /** Get sequence mode. */
    inline SequenceMode getMode() const { return _mode; }

protected :
    
    virtual ~Sequence() {}

    float _last;
    std::vector<float> _frameTime;

    int _step;

    LoopMode _loopMode;
    int _begin, _end;

    float _speed;
    int _nreps, _nrepsremain;

    SequenceMode _mode;
};

}

#endif