125 lines
3.6 KiB
Plaintext
125 lines
3.6 KiB
Plaintext
//C++ header - Open Scene Graph - Copyright (C) 1998-2002 Robert Osfield
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//Distributed under the terms of the GNU Library General Public License (LGPL)
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//as published by the Free Software Foundation.
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//osgParticle - Copyright (C) 2002 Marco Jez
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#ifndef OSGPARTICLE_SECTORPLACER_
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#define OSGPARTICLE_SECTORPLACER_ 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 ©, const osg::CopyOp ©op = 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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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 ©, const osg::CopyOp ©op)
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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_.min = r1;
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rad_range_.max = 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_.min = r1;
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phi_range_.max = 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();
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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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}
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#endif
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