root/OpenSceneGraph/trunk/include/osgParticle/AngularAccelOperator @ 13041

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1/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield
2 *
3 * This library is open source and may be redistributed and/or modified under
4 * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
5 * (at your option) any later version.  The full license is in LICENSE file
6 * included with this distribution, and on the openscenegraph.org website.
7 *
8 * This library is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
11 * OpenSceneGraph Public License for more details.
12*/
13//osgParticle - Copyright (C) 2002 Marco Jez
14
15#ifndef OSGPARTICLE_ANGULARACCELOPERATOR
16#define OSGPARTICLE_ANGULARACCELOPERATOR 1
17
18#include <osgParticle/ModularProgram>
19#include <osgParticle/Operator>
20#include <osgParticle/Particle>
21
22#include <osg/CopyOp>
23#include <osg/Object>
24#include <osg/Vec3>
25
26namespace osgParticle
27{
28
29    /**    An operator class that applies a constant angular acceleration to
30     *     the particles.
31     */
32    class AngularAccelOperator: public Operator {
33    public:
34        inline AngularAccelOperator();
35        inline AngularAccelOperator(const AngularAccelOperator& copy, const osg::CopyOp& copyop = osg::CopyOp::SHALLOW_COPY);
36
37        META_Object(osgParticle, AngularAccelOperator);
38
39        /// Get the angular acceleration vector.
40        inline const osg::Vec3& getAngularAcceleration() const;
41
42        /// Set the angular acceleration vector.
43        inline void setAngularAcceleration(const osg::Vec3& v);
44
45        /// Apply the angular acceleration to a particle. Do not call this method manually.
46        inline void operate(Particle* P, double dt);
47
48        /// Perform some initializations. Do not call this method manually.
49        inline void beginOperate(Program *prg);
50
51    protected:
52        virtual ~AngularAccelOperator() {}
53        AngularAccelOperator& operator=(const AngularAccelOperator& ) { return *this; }
54
55    private:
56        osg::Vec3 _angul_araccel;
57        osg::Vec3 _xf_angul_araccel;
58    };
59
60    // INLINE FUNCTIONS
61
62    inline AngularAccelOperator::AngularAccelOperator()
63    : Operator(), _angul_araccel(0, 0, 0)
64    {
65    }
66
67    inline AngularAccelOperator::AngularAccelOperator(const AngularAccelOperator& copy, const osg::CopyOp& copyop)
68    : Operator(copy, copyop), _angul_araccel(copy._angul_araccel)
69    {
70    }
71
72    inline const osg::Vec3& AngularAccelOperator::getAngularAcceleration() const
73    {
74        return _angul_araccel;
75    }
76
77    inline void AngularAccelOperator::setAngularAcceleration(const osg::Vec3& v)
78    {
79        _angul_araccel = v;
80    }
81
82    inline void AngularAccelOperator::operate(Particle* P, double dt)
83    {
84        P->addAngularVelocity(_xf_angul_araccel * dt);
85    }
86
87    inline void AngularAccelOperator::beginOperate(Program *prg)
88    {
89        if (prg->getReferenceFrame() == ModularProgram::RELATIVE_RF) {
90            _xf_angul_araccel = prg->rotateLocalToWorld(_angul_araccel);
91        } else {
92            _xf_angul_araccel = _angul_araccel;
93        }
94    }
95
96}
97
98
99#endif
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