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149 lines
4.6 KiB
149 lines
4.6 KiB
/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 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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//osgParticle - Copyright (C) 2002 Marco Jez |
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#ifndef OSGPARTICLE_SECTOR_PLACER |
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#define OSGPARTICLE_SECTOR_PLACER 1 |
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#include <osgParticle/CenteredPlacer> |
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#include <osgParticle/Particle> |
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#include <osgParticle/range> |
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#include <osg/CopyOp> |
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#include <osg/Object> |
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#include <osg/Vec3> |
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#include <osg/Math> |
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namespace osgParticle |
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{ |
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/** A sector-shaped particle placer. |
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This placer sets the initial position of incoming particle by choosing a random position |
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within a circular sector; this sector is defined by three parameters: a <I>center point</I>, |
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which is inherited directly from <CODE>osgParticle::CenteredPlacer</CODE>, a range of values |
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for <I>radius</I>, and a range of values for the <I>central angle</I> (sometimes called <B>phi</B>). |
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*/ |
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class SectorPlacer: public CenteredPlacer { |
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public: |
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inline SectorPlacer(); |
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inline SectorPlacer(const SectorPlacer& copy, const osg::CopyOp& copyop = osg::CopyOp::SHALLOW_COPY); |
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/// Get the range of possible values for radius. |
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inline const rangef& getRadiusRange() const; |
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/// Set the range of possible values for radius. |
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inline void setRadiusRange(const rangef& r); |
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/// Set the range of possible values for radius. |
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inline void setRadiusRange(float r1, float r2); |
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/// Get the range of possible values for the central angle. |
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inline const rangef& getPhiRange() const; |
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/// Set the range of possible values for the central angle. |
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inline void setPhiRange(const rangef& r); |
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/// Set the range of possible values for the central angle. |
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inline void setPhiRange(float r1, float r2); |
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META_Object(osgParticle, SectorPlacer); |
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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 area of the sector |
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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 ~SectorPlacer() {} |
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SectorPlacer& operator=(const SectorPlacer&) { return *this; } |
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private: |
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rangef _rad_range; |
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rangef _phi_range; |
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}; |
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// INLINE FUNCTIONS |
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inline SectorPlacer::SectorPlacer() |
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: CenteredPlacer(), _rad_range(0, 1), _phi_range(0, osg::PI*2) |
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{ |
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} |
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inline SectorPlacer::SectorPlacer(const SectorPlacer& copy, const osg::CopyOp& copyop) |
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: CenteredPlacer(copy, copyop), _rad_range(copy._rad_range), _phi_range(copy._phi_range) |
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{ |
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} |
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inline const rangef& SectorPlacer::getRadiusRange() const |
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{ |
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return _rad_range; |
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} |
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inline const rangef& SectorPlacer::getPhiRange() const |
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{ |
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return _phi_range; |
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} |
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inline void SectorPlacer::setRadiusRange(const rangef& r) |
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{ |
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_rad_range = r; |
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} |
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inline void SectorPlacer::setRadiusRange(float r1, float r2) |
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{ |
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_rad_range.minimum = r1; |
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_rad_range.maximum = r2; |
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} |
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inline void SectorPlacer::setPhiRange(const rangef& r) |
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{ |
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_phi_range = r; |
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} |
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inline void SectorPlacer::setPhiRange(float r1, float r2) |
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{ |
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_phi_range.minimum = r1; |
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_phi_range.maximum = r2; |
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} |
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inline void SectorPlacer::place(Particle* P) const |
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{ |
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float rad = _rad_range.get_random_sqrtf(); |
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float phi = _phi_range.get_random(); |
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osg::Vec3 pos( |
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getCenter().x() + rad * cosf(phi), |
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getCenter().y() + rad * sinf(phi), |
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getCenter().z()); |
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P->setPosition(pos); |
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} |
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inline float SectorPlacer::volume() const |
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{ |
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return 0.5f * (_phi_range.maximum - _phi_range.minimum) * |
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(_rad_range.maximum*_rad_range.maximum - _rad_range.minimum*_rad_range.minimum); |
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} |
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inline osg::Vec3 SectorPlacer::getControlPosition() const |
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{ |
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return getCenter(); |
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} |
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} |
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#endif
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