//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.
//osgParticle - Copyright (C) 2002 Marco Jez

#ifndef OSGPARTICLE_PLACER_
#define OSGPARTICLE_PLACER_ 1

#include <osg/CopyOp>
#include <osg/Object>

namespace osgParticle
{

    class Particle;

    /**    An abstract base class for implementing <I>particle placers</I>. A placer is an object which take
        a particle as input, and places it somewhere by setting its position vector. Placer objects are
        used by the <CODE>ModularEmitter</CODE> class as part of the particle emission process.
    */
    class Placer: public osg::Object {
    public:
        inline Placer();
        inline Placer(const Placer &copy, const osg::CopyOp &copyop = osg::CopyOp::SHALLOW_COPY);

        virtual const char *libraryName() const { return "osgParticle"; }
        virtual const char *className() const { return "Placer"; }
        virtual bool isSameKindAs(const osg::Object *obj) const { return dynamic_cast<const Placer *>(obj) != 0; }

        /// Place a particle. Must be implemented in descendant classes.
        virtual void place(Particle *P) const = 0;

    protected:
        ~Placer() {}
        Placer &operator=(const Placer &) { return *this; }
    };
    
    // INLINE FUNCTIONS
    
    inline Placer::Placer()
    : osg::Object()
    {
    }
    
    inline Placer::Placer(const Placer &copy, const osg::CopyOp &copyop)
    : osg::Object(copy, copyop)
    {
    }

}

#endif