//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_EMITTER_
#define OSGPARTICLE_EMITTER_ 1

#include <osgParticle/Export>
#include <osgParticle/ParticleProcessor>
#include <osgParticle/Particle>

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

namespace osgParticle
{

    /**    An abstract base class for particle emitters.
        Descendant classes must override the <CODE>emit()</CODE> method to generate new particles by
        calling the <CODE>ParticleSystem::createParticle()</CODE> method on the particle system associated
        to the emitter.
    */
    class OSGPARTICLE_EXPORT Emitter: public ParticleProcessor {
    public:
        Emitter();
        Emitter(const Emitter &copy, const osg::CopyOp &copyop = osg::CopyOp::SHALLOW_COPY);

        virtual const char *libraryName() const { return "osgParticle"; }
        virtual const char *className() const { return "Emitter"; }
        virtual bool isSameKindAs(const osg::Object *obj) const { return dynamic_cast<const Emitter*>(obj) != 0; }
        virtual void accept(osg::NodeVisitor& nv) { if (nv.validNodeMask(*this)) { nv.pushOntoNodePath(this); nv.apply(*this); nv.popFromNodePath(); } }
        
        /// Get the particle template.
        inline const Particle &getParticleTemplate() const;
        
        /// Set the particle template (particle is copied).
        inline void setParticleTemplate(const Particle &p);
        
        /// Return whether the particle system's default template should be used.
        inline bool getUseDefaultTemplate() const;
        
        /** Set whether the default particle template should be used.
            When this flag is true, the particle template is ignored, and the
            particle system's default template is used instead.
        */
        inline void setUseDefaultTemplate(bool v);

    protected:
        virtual ~Emitter() {}
        Emitter &operator=(const Emitter &) { return *this; }
        
        inline void process(double dt);
        
        virtual void emit(double dt) = 0;
        
    private:        
        bool usedeftemp_;
        Particle ptemp_;
    };

    // INLINE FUNCTIONS

    inline const Particle &Emitter::getParticleTemplate() const
    {
        return ptemp_;
    }

    inline void Emitter::setParticleTemplate(const Particle &p)
    {
        ptemp_ = p;
        usedeftemp_ = false;
    }

    inline bool Emitter::getUseDefaultTemplate() const
    {
        return usedeftemp_;
    }

    inline void Emitter::setUseDefaultTemplate(bool v)
    {
        usedeftemp_ = v;
    }

    inline void Emitter::process(double dt)
    {
        emit(dt);
    }


}


#endif