76 lines
2.6 KiB
Plaintext
76 lines
2.6 KiB
Plaintext
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/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2005 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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#ifndef OSGPARTICLE_CONSTANTRATECOUNTER
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#define OSGPARTICLE_CONSTANTRATECOUNTER 1
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#include <osgParticle/Counter>
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#include <osg/Object>
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#include <osg/Math>
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namespace osgParticle
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{
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class ConstantRateCounter: public Counter {
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public:
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ConstantRateCounter():
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Counter(),
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_minimumNumberOfParticlesToCreate(0),
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_numberOfParticlesPerSecondToCreate(0)
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{
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}
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ConstantRateCounter(const ConstantRateCounter& copy, const osg::CopyOp& copyop = osg::CopyOp::SHALLOW_COPY):
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Counter(copy, copyop),
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_minimumNumberOfParticlesToCreate(copy._minimumNumberOfParticlesToCreate),
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_numberOfParticlesPerSecondToCreate(copy._numberOfParticlesPerSecondToCreate)
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{
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}
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META_Object(osgParticle, ConstantRateCounter);
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void setMinimumNumberOfParticlesToCreate(int minNumToCreate) { _minimumNumberOfParticlesToCreate = minNumToCreate; }
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int getMinimumNumberOfParticlesToCreate() const { return _minimumNumberOfParticlesToCreate; }
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void setNumberOfParticlesPerSecondToCreate(double numPerSecond) { _numberOfParticlesPerSecondToCreate = numPerSecond; }
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double getNumberOfParticlesPerSecondToCreate() const { return _numberOfParticlesPerSecondToCreate; }
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/// Return the number of particles to be created in this frame
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virtual int numParticlesToCreate(double dt) const
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{
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double v = (dt*_numberOfParticlesPerSecondToCreate);
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int i = (int)(v);
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_carryOver += (v-(double)i);
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if (_carryOver>1.0)
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{
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++i;
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_carryOver -= 1.0;
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}
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return osg::maximum(_minimumNumberOfParticlesToCreate, i);
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}
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protected:
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virtual ~ConstantRateCounter() {}
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int _minimumNumberOfParticlesToCreate;
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double _numberOfParticlesPerSecondToCreate;
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mutable double _carryOver;
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};
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}
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#endif
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