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77 lines
2.7 KiB
77 lines
2.7 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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#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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_carryOver(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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_carryOver(copy._carryOver) |
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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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