root/OpenSceneGraph/trunk/include/osgParticle/ForceOperator @ 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_FORCEOPERATOR
16#define OSGPARTICLE_FORCEOPERATOR 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 that applies a constant force to the particles.
30      * Remember that if the mass of particles is expressed in kg and the lengths are
31      * expressed in meters, then the force should be expressed in Newtons.
32    */
33    class ForceOperator: public Operator {
34    public:
35        inline ForceOperator();
36        inline ForceOperator(const ForceOperator& copy, const osg::CopyOp& copyop = osg::CopyOp::SHALLOW_COPY);
37
38        META_Object(osgParticle, ForceOperator);
39
40        /// Get the force vector.
41        inline const osg::Vec3& getForce() const;
42
43        /// Set the force vector.
44        inline void setForce(const osg::Vec3& f);
45
46        /// Apply the force to a particle. Do not call this method manually.
47        inline void operate(Particle* P, double dt);
48
49        /// Perform some initialization. Do not call this method manually.
50        inline void beginOperate(Program *prg);
51
52    protected:
53        virtual ~ForceOperator() {};
54        ForceOperator& operator=(const ForceOperator&) { return *this; }
55
56    private:
57        osg::Vec3 _force;
58        osg::Vec3 _xf_force;
59    };
60
61    // INLINE FUNCTIONS
62
63    inline ForceOperator::ForceOperator()
64    : Operator(), _force(0, 0, 0)
65    {
66    }
67
68    inline ForceOperator::ForceOperator(const ForceOperator& copy, const osg::CopyOp& copyop)
69    : Operator(copy, copyop), _force(copy._force)
70    {
71    }
72
73    inline const osg::Vec3& ForceOperator::getForce() const
74    {
75        return _force;
76    }
77
78    inline void ForceOperator::setForce(const osg::Vec3& v)
79    {
80        _force = v;
81    }
82
83    inline void ForceOperator::operate(Particle* P, double dt)
84    {
85        P->addVelocity(_xf_force * (P->getMassInv() * dt));
86    }
87
88    inline void ForceOperator::beginOperate(Program *prg)
89    {
90        if (prg->getReferenceFrame() == ModularProgram::RELATIVE_RF) {
91            _xf_force = prg->rotateLocalToWorld(_force);
92        } else {
93            _xf_force = _force;
94        }
95    }
96}
97
98#endif
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