root/OpenSceneGraph/trunk/include/osgParticle/AccelOperator @ 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_ACCELOPERATOR
16#define OSGPARTICLE_ACCELOPERATOR 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 acceleration to the particles.
30    */
31    class AccelOperator: public Operator {
32    public:
33        inline AccelOperator();
34        inline AccelOperator(const AccelOperator& copy, const osg::CopyOp& copyop = osg::CopyOp::SHALLOW_COPY);
35
36        META_Object(osgParticle, AccelOperator);
37
38        /// Get the acceleration vector.
39        inline const osg::Vec3& getAcceleration() const;
40
41        /// Set the acceleration vector.
42        inline void setAcceleration(const osg::Vec3& v);
43
44        /** Quickly set the acceleration vector to the gravity on earth (0, 0, -9.81).
45            The acceleration will be multiplied by the <CODE>scale</CODE> parameter.
46        */
47        inline void setToGravity(float scale = 1);
48
49        /// Apply the acceleration to a particle. Do not call this method manually.
50        inline void operate(Particle* P, double dt);
51
52        /// Perform some initializations. Do not call this method manually.
53        inline void beginOperate(Program *prg);
54
55    protected:
56        virtual ~AccelOperator() {}
57        AccelOperator &operator=(const AccelOperator &) { return *this; }
58
59    private:
60        osg::Vec3 _accel;
61        osg::Vec3 _xf_accel;
62    };
63
64    // INLINE FUNCTIONS
65
66    inline AccelOperator::AccelOperator()
67    : Operator(), _accel(0, 0, 0)
68    {
69    }
70
71    inline AccelOperator::AccelOperator(const AccelOperator& copy, const osg::CopyOp& copyop)
72    : Operator(copy, copyop), _accel(copy._accel)
73    {
74    }
75
76    inline const osg::Vec3& AccelOperator::getAcceleration() const
77    {
78        return _accel;
79    }
80
81    inline void AccelOperator::setAcceleration(const osg::Vec3& v)
82    {
83        _accel = v;
84    }
85
86    inline void AccelOperator::setToGravity(float scale)
87    {
88        _accel.set(0, 0, -9.80665f * scale);
89    }
90
91    inline void AccelOperator::operate(Particle* P, double dt)
92    {
93        P->addVelocity(_xf_accel * dt);
94    }
95
96    inline void AccelOperator::beginOperate(Program *prg)
97    {
98        if (prg->getReferenceFrame() == ModularProgram::RELATIVE_RF) {
99            _xf_accel = prg->rotateLocalToWorld(_accel);
100        } else {
101            _xf_accel = _accel;
102        }
103    }
104
105}
106
107
108#endif
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