123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149 |
- /* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield
- *
- * This library is open source and may be redistributed and/or modified under
- * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
- * (at your option) any later version. The full license is in LICENSE file
- * included with this distribution, and on the openscenegraph.org website.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * OpenSceneGraph Public License for more details.
- */
- //osgParticle - Copyright (C) 2002 Marco Jez
- #ifndef OSGPARTICLE_SECTOR_PLACER
- #define OSGPARTICLE_SECTOR_PLACER 1
- #include <osgParticle/CenteredPlacer>
- #include <osgParticle/Particle>
- #include <osgParticle/range>
- #include <osg/CopyOp>
- #include <osg/Object>
- #include <osg/Vec3>
- #include <osg/Math>
- namespace osgParticle
- {
- /** A sector-shaped particle placer.
- This placer sets the initial position of incoming particle by choosing a random position
- within a circular sector; this sector is defined by three parameters: a <I>center point</I>,
- which is inherited directly from <CODE>osgParticle::CenteredPlacer</CODE>, a range of values
- for <I>radius</I>, and a range of values for the <I>central angle</I> (sometimes called <B>phi</B>).
- */
- class SectorPlacer: public CenteredPlacer {
- public:
- inline SectorPlacer();
- inline SectorPlacer(const SectorPlacer& copy, const osg::CopyOp& copyop = osg::CopyOp::SHALLOW_COPY);
- /// Get the range of possible values for radius.
- inline const rangef& getRadiusRange() const;
- /// Set the range of possible values for radius.
- inline void setRadiusRange(const rangef& r);
- /// Set the range of possible values for radius.
- inline void setRadiusRange(float r1, float r2);
- /// Get the range of possible values for the central angle.
- inline const rangef& getPhiRange() const;
- /// Set the range of possible values for the central angle.
- inline void setPhiRange(const rangef& r);
- /// Set the range of possible values for the central angle.
- inline void setPhiRange(float r1, float r2);
- META_Object(osgParticle, SectorPlacer);
- /// Place a particle. Do not call it manually.
- inline void place(Particle* P) const;
- /// return the area of the sector
- inline float volume() const;
- /// return the control position
- inline osg::Vec3 getControlPosition() const;
- protected:
- virtual ~SectorPlacer() {}
- SectorPlacer& operator=(const SectorPlacer&) { return *this; }
- private:
- rangef _rad_range;
- rangef _phi_range;
- };
- // INLINE FUNCTIONS
- inline SectorPlacer::SectorPlacer()
- : CenteredPlacer(), _rad_range(0, 1), _phi_range(0, osg::PI*2)
- {
- }
- inline SectorPlacer::SectorPlacer(const SectorPlacer& copy, const osg::CopyOp& copyop)
- : CenteredPlacer(copy, copyop), _rad_range(copy._rad_range), _phi_range(copy._phi_range)
- {
- }
- inline const rangef& SectorPlacer::getRadiusRange() const
- {
- return _rad_range;
- }
- inline const rangef& SectorPlacer::getPhiRange() const
- {
- return _phi_range;
- }
- inline void SectorPlacer::setRadiusRange(const rangef& r)
- {
- _rad_range = r;
- }
- inline void SectorPlacer::setRadiusRange(float r1, float r2)
- {
- _rad_range.minimum = r1;
- _rad_range.maximum = r2;
- }
- inline void SectorPlacer::setPhiRange(const rangef& r)
- {
- _phi_range = r;
- }
- inline void SectorPlacer::setPhiRange(float r1, float r2)
- {
- _phi_range.minimum = r1;
- _phi_range.maximum = r2;
- }
- inline void SectorPlacer::place(Particle* P) const
- {
- float rad = _rad_range.get_random_sqrtf();
- float phi = _phi_range.get_random();
- osg::Vec3 pos(
- getCenter().x() + rad * cosf(phi),
- getCenter().y() + rad * sinf(phi),
- getCenter().z());
- P->setPosition(pos);
- }
- inline float SectorPlacer::volume() const
- {
- return 0.5f * (_phi_range.maximum - _phi_range.minimum) *
- (_rad_range.maximum*_rad_range.maximum - _rad_range.minimum*_rad_range.minimum);
- }
- inline osg::Vec3 SectorPlacer::getControlPosition() const
- {
- return getCenter();
- }
- }
- #endif
|