150 lines
4.4 KiB
C++
150 lines
4.4 KiB
C++
/* -*-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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