root/OpenSceneGraph/trunk/include/osgParticle/Placer @ 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_PLACER
16#define OSGPARTICLE_PLACER 1
17
18#include <osg/CopyOp>
19#include <osg/Object>
20#include <osg/Vec3>
21
22namespace osgParticle
23{
24
25    class Particle;
26
27    /**    An abstract base class for implementing <I>particle placers</I>. A placer is an object which take
28        a particle as input, and places it somewhere by setting its position vector. Placer objects are
29        used by the <CODE>ModularEmitter</CODE> class as part of the particle emission process.
30    */
31    class Placer: public osg::Object {
32    public:
33        inline Placer();
34        inline Placer(const Placer& copy, const osg::CopyOp& copyop = osg::CopyOp::SHALLOW_COPY);
35
36        virtual const char* libraryName() const { return "osgParticle"; }
37        virtual const char* className() const { return "Placer"; }
38        virtual bool isSameKindAs(const osg::Object* obj) const { return dynamic_cast<const Placer *>(obj) != 0; }
39
40        /// Place a particle. Must be implemented in descendant classes.
41        virtual void place(Particle* P) const = 0;
42
43        /// Volume of the placer. Can be implemented in descendant classes.
44        virtual float volume() const { return 1.0f; }
45
46        /// Return the control position of particles that placer will generate. Must be implemented in descendant classes.
47        virtual osg::Vec3 getControlPosition() const = 0;
48
49    protected:
50        ~Placer() {}
51        Placer& operator=(const Placer& ) { return *this; }
52    };
53
54    // INLINE FUNCTIONS
55
56    inline Placer::Placer()
57    : osg::Object()
58    {
59    }
60
61    inline Placer::Placer(const Placer& copy, const osg::CopyOp& copyop)
62    : osg::Object(copy, copyop)
63    {
64    }
65
66}
67
68#endif
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