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

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1/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2010 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// Written by Wang Rui, (C) 2010
14
15#ifndef OSGPARTICLE_ORBITOPERATOR
16#define OSGPARTICLE_ORBITOPERATOR
17
18#include <osgParticle/ModularProgram>
19#include <osgParticle/Operator>
20#include <osgParticle/Particle>
21
22namespace osgParticle
23{
24
25
26/** An orbit operator forces particles in the orbit around a point.
27    Refer to David McAllister's Particle System API (http://www.particlesystems.org)
28*/
29class OrbitOperator : public Operator
30{
31public:
32    OrbitOperator()
33    : Operator(), _magnitude(1.0f), _epsilon(1e-3), _maxRadius(FLT_MAX)
34    {}
35
36    OrbitOperator( const OrbitOperator& copy, const osg::CopyOp& copyop = osg::CopyOp::SHALLOW_COPY )
37    :   Operator(copy, copyop), _center(copy._center), _magnitude(copy._magnitude),
38        _epsilon(copy._epsilon), _maxRadius(copy._maxRadius)
39    {}
40
41    META_Object( osgParticle, OrbitOperator );
42
43    /// Set the center of orbit
44    void setCenter( const osg::Vec3& c ) { _center = c; }
45
46    /// Get the center of orbit
47    const osg::Vec3& getCenter() const { return _center; }
48
49    /// Set the acceleration scale
50    void setMagnitude( float mag ) { _magnitude = mag; }
51
52    /// Get the acceleration scale
53    float getMagnitude() const { return _magnitude; }
54
55    /// Set the acceleration epsilon
56    void setEpsilon( float eps ) { _epsilon = eps; }
57
58    /// Get the acceleration epsilon
59    float getEpsilon() const { return _epsilon; }
60
61    /// Set max radius between the center and the particle
62    void setMaxRadius( float max ) { _maxRadius = max; }
63
64    /// Get max radius between the center and the particle
65    float getMaxRadius() const { return _maxRadius; }
66
67    /// Apply the acceleration to a particle. Do not call this method manually.
68    inline void operate( Particle* P, double dt );
69
70    /// Perform some initializations. Do not call this method manually.
71    inline void beginOperate( Program* prg );
72
73protected:
74    virtual ~OrbitOperator() {}
75    OrbitOperator& operator=( const OrbitOperator& ) { return *this; }
76
77    osg::Vec3 _center;
78    osg::Vec3 _xf_center;
79    float _magnitude;
80    float _epsilon;
81    float _maxRadius;
82};
83
84// INLINE METHODS
85
86inline void OrbitOperator::operate( Particle* P, double dt )
87{
88    osg::Vec3 dir = _xf_center - P->getPosition();
89    float length = dir.length();
90    if ( length<_maxRadius )
91    {
92        P->addVelocity( dir * ((_magnitude * dt) /
93                        (length * (_epsilon+length*length))) );
94    }
95}
96
97inline void OrbitOperator::beginOperate( Program* prg )
98{
99    if ( prg->getReferenceFrame()==ModularProgram::RELATIVE_RF )
100    {
101        _xf_center = prg->transformLocalToWorld(_center);
102    }
103    else
104    {
105        _xf_center = _center;
106    }
107}
108
109
110}
111
112#endif
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