109 lines
3.1 KiB
C++
109 lines
3.1 KiB
C++
/* -*-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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//osgParticle - Copyright (C) 2002 Marco Jez
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#ifndef OSGPARTICLE_ACCELOPERATOR
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#define OSGPARTICLE_ACCELOPERATOR 1
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#include <osgParticle/ModularProgram>
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#include <osgParticle/Operator>
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#include <osgParticle/Particle>
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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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namespace osgParticle
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{
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/** An operator class that applies a constant acceleration to the particles.
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*/
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class AccelOperator: public Operator {
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public:
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inline AccelOperator();
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inline AccelOperator(const AccelOperator& copy, const osg::CopyOp& copyop = osg::CopyOp::SHALLOW_COPY);
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META_Object(osgParticle, AccelOperator);
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/// Get the acceleration vector.
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inline const osg::Vec3& getAcceleration() const;
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/// Set the acceleration vector.
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inline void setAcceleration(const osg::Vec3& v);
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/** Quickly set the acceleration vector to the gravity on earth (0, 0, -9.81).
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The acceleration will be multiplied by the <CODE>scale</CODE> parameter.
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*/
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inline void setToGravity(float scale = 1);
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/// Apply the acceleration to a particle. Do not call this method manually.
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inline void operate(Particle* P, double dt);
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/// Perform some initializations. Do not call this method manually.
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inline void beginOperate(Program *prg);
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protected:
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virtual ~AccelOperator() {}
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AccelOperator &operator=(const AccelOperator &) { return *this; }
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private:
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osg::Vec3 _accel;
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osg::Vec3 _xf_accel;
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};
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// INLINE FUNCTIONS
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inline AccelOperator::AccelOperator()
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: Operator(), _accel(0, 0, 0)
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{
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}
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inline AccelOperator::AccelOperator(const AccelOperator& copy, const osg::CopyOp& copyop)
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: Operator(copy, copyop), _accel(copy._accel)
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{
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}
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inline const osg::Vec3& AccelOperator::getAcceleration() const
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{
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return _accel;
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}
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inline void AccelOperator::setAcceleration(const osg::Vec3& v)
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{
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_accel = v;
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}
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inline void AccelOperator::setToGravity(float scale)
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{
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_accel.set(0, 0, -9.80665f * scale);
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}
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inline void AccelOperator::operate(Particle* P, double dt)
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{
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P->addVelocity(_xf_accel * dt);
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}
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inline void AccelOperator::beginOperate(Program *prg)
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{
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if (prg->getReferenceFrame() == ModularProgram::RELATIVE_RF) {
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_xf_accel = prg->rotateLocalToWorld(_accel);
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} else {
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_xf_accel = _accel;
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}
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}
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}
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#endif
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