105 lines
3.1 KiB
C++
105 lines
3.1 KiB
C++
/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2010 Robert Osfield
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*
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* This library is open source and may be redistributed and/or modified under
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* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
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* (at your option) any later version. The full license is in LICENSE file
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* included with this distribution, and on the openscenegraph.org website.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* OpenSceneGraph Public License for more details.
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*/
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// Written by Wang Rui, (C) 2010
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#ifndef OSGPARTICLE_COMPOSITEPLACER
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#define OSGPARTICLE_COMPOSITEPLACER
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#include <osgParticle/Placer>
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#include <osgParticle/Particle>
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namespace osgParticle
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{
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/** A composite particle placer which allows particles to be generated from a union of placers. */
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class CompositePlacer : public Placer
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{
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public:
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CompositePlacer() : Placer() {}
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CompositePlacer( const CompositePlacer& copy, const osg::CopyOp& copyop = osg::CopyOp::SHALLOW_COPY )
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: Placer(copy, copyop), _placers(copy._placers) {}
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META_Object( osgParticle, CompositePlacer );
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// Set a child placer at specific index
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void setPlacer( unsigned int i, Placer* p )
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{
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if (i<_placers.size()) _placers[i] = p;
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else addPlacer(p);
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}
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/// Add a child placer
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void addPlacer( Placer* p ) { _placers.push_back(p); }
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/// Remove a child placer
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void removePlacer( unsigned int i )
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{ if (i<_placers.size()) _placers.erase(_placers.begin()+i); }
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/// Get a child placer
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Placer* getPlacer( unsigned int i ) { return _placers[i].get(); }
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const Placer* getPlacer( unsigned int i ) const { return _placers[i].get(); }
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/// Get number of placers
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unsigned int getNumPlacers() const { return _placers.size(); }
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/// Place a particle. Do not call it manually.
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inline void place( Particle* P ) const;
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/// return the volume of the box
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inline float volume() const;
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/// return the control position
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inline osg::Vec3 getControlPosition() const;
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protected:
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virtual ~CompositePlacer() {}
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CompositePlacer& operator=( const CompositePlacer& ) { return *this; }
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typedef std::vector< osg::ref_ptr<Placer> > PlacerList;
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PlacerList _placers;
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};
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// INLINE METHODS
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inline void CompositePlacer::place( Particle* P ) const
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{
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rangef sizeRange( 0.0f, volume() );
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float current = 0.0f, selected = sizeRange.get_random();
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for ( PlacerList::const_iterator itr=_placers.begin(); itr!=_placers.end(); ++itr )
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{
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current += (*itr)->volume();
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if ( selected<=current ) (*itr)->place( P );
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}
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}
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inline float CompositePlacer::volume() const
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{
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float total_size = 0.0f;
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for ( PlacerList::const_iterator itr=_placers.begin(); itr!=_placers.end(); ++itr )
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total_size += (*itr)->volume();
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return total_size;
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}
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inline osg::Vec3 CompositePlacer::getControlPosition() const
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{
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if ( !_placers.size() ) return osg::Vec3();
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return _placers.front()->getControlPosition();
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}
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}
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#endif
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