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115 lines
4.1 KiB
115 lines
4.1 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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//osgParticle - Copyright (C) 2002 Marco Jez |
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#ifndef OSGPARTICLE_OPERATOR |
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#define OSGPARTICLE_OPERATOR 1 |
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#include <osgParticle/Program> |
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#include <osg/CopyOp> |
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#include <osg/Object> |
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#include <osg/Matrix> |
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namespace osgParticle |
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{ |
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// forward declaration to avoid including the whole header file |
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class Particle; |
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/** An abstract base class used by <CODE>ModularProgram</CODE> to perform operations on particles before they are updated. |
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To implement a new operator, derive from this class and override the <CODE>operate()</CODE> method. |
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You should also override the <CODE>beginOperate()</CODE> method to query the calling program for the reference frame |
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used, and initialize the right transformations if needed. |
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*/ |
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class Operator: public osg::Object { |
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public: |
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inline Operator(); |
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inline Operator(const Operator& copy, const osg::CopyOp& copyop = osg::CopyOp::SHALLOW_COPY); |
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virtual const char* libraryName() const { return "osgParticle"; } |
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virtual const char* className() const { return "Operator"; } |
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virtual bool isSameKindAs(const osg::Object* obj) const { return dynamic_cast<const Operator* >(obj) != 0; } |
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/// Get whether this operator is enabled. |
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inline bool isEnabled() const; |
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/// Enable or disable this operator. |
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inline void setEnabled(bool v); |
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/** Do something on all emitted particles. |
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This method is called by <CODE>ModularProgram</CODE> objects to perform some operations |
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on the particles. By default, it will call the <CODE>operate()</CODE> method for each particle. |
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You must override it in descendant classes. |
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*/ |
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virtual void operateParticles(ParticleSystem* ps, double dt) |
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{ |
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int n = ps->numParticles(); |
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for (int i=0; i<n; ++i) |
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{ |
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Particle* P = ps->getParticle(i); |
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if (P->isAlive() && isEnabled()) operate(P, dt); |
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} |
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} |
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/** Do something on a particle. |
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You must override it in descendant classes. Common operations |
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consist of modifying the particle's velocity vector. The <CODE>dt</CODE> parameter is |
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the time elapsed from last operation. |
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*/ |
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virtual void operate(Particle* P, double dt) = 0; |
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/** Do something before processing particles via the <CODE>operate()</CODE> method. |
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Overriding this method could be necessary to query the calling <CODE>Program</CODE> object |
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for the current reference frame. If the reference frame is RELATIVE_RF, then your |
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class should prepare itself to do all operations in local coordinates. |
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*/ |
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virtual void beginOperate(Program *) {} |
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/// Do something after all particles have been processed. |
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virtual void endOperate() {} |
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protected: |
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virtual ~Operator() {} |
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Operator &operator=(const Operator &) { return *this; } |
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private: |
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bool _enabled; |
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}; |
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// INLINE FUNCTIONS |
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inline Operator::Operator() |
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: osg::Object(), _enabled(true) |
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{ |
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} |
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inline Operator::Operator(const Operator& copy, const osg::CopyOp& copyop) |
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: osg::Object(copy, copyop), _enabled(copy._enabled) |
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{ |
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} |
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inline bool Operator::isEnabled() const |
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{ |
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return _enabled; |
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} |
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inline void Operator::setEnabled(bool v) |
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{ |
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_enabled = v; |
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} |
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} |
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#endif
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