root/OpenSceneGraph/trunk/include/osgParticle/MultiSegmentPlacer @ 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_MULTISEGMENT_PLACER
16#define OSGPARTICLE_MULTISEGMENT_PLACER 1
17
18#include <osgParticle/Export>
19#include <osgParticle/Placer>
20#include <osgParticle/Particle>
21
22#include <vector>
23#include <utility>
24
25#include <osg/Notify>
26#include <osg/CopyOp>
27#include <osg/Object>
28#include <osg/Vec3>
29
30namespace osgParticle {
31
32    /** A polyline-shaped particle placer.
33        This placer class sets the position of incoming particles by choosing a random point on the
34        specified sequence of connected segments.
35    */
36    class OSGPARTICLE_EXPORT MultiSegmentPlacer: public Placer {
37    public:
38        MultiSegmentPlacer();
39        MultiSegmentPlacer(const MultiSegmentPlacer& copy, const osg::CopyOp& copyop = osg::CopyOp::SHALLOW_COPY);
40
41        META_Object(osgParticle, MultiSegmentPlacer);
42
43        /// Get the number of vertices which define the segments.
44        inline int numVertices() const;
45
46        /// Get a vertex.
47        inline const osg::Vec3& getVertex(int i) const;
48
49        /// Set a vertex.
50        inline void setVertex(int i, const osg::Vec3& v);
51
52        /// Set a vertex.
53        inline void setVertex(int i, float x, float y, float z);
54
55        /// Add a vertex.
56        inline void addVertex(const osg::Vec3& v);
57
58        /// Add a vertex.
59        inline void addVertex(float x, float y, float z);
60
61        /// Remove a vertex.
62        inline void removeVertex(int i);
63
64        /// Place a partice. Called automatically by <CODE>ModularEmitter</CODE>, do not call this method manually.
65        void place(Particle* P) const;
66
67        /// return the length of the multi-segment
68        inline float volume() const;
69
70        /// return the control position
71        inline osg::Vec3 getControlPosition() const;
72
73    protected:
74        virtual ~MultiSegmentPlacer() {}
75        MultiSegmentPlacer& operator=(const MultiSegmentPlacer&) { return *this; }
76
77    private:
78        typedef std::pair<osg::Vec3, float> Vertex_data;
79        typedef std::vector<Vertex_data> Vertex_vector;
80
81        Vertex_vector _vx;
82        float _total_length;
83
84        void recompute_length();
85    };
86
87    // INLINE FUNCTIONS
88
89
90    inline int MultiSegmentPlacer::numVertices() const
91    {
92        return static_cast<int>(_vx.size());
93    }
94
95    inline const osg::Vec3& MultiSegmentPlacer::getVertex(int i) const
96    {
97        return _vx[i].first;
98    }
99
100    inline void MultiSegmentPlacer::setVertex(int i, const osg::Vec3& v)
101    {
102        _vx[i].first = v;
103        recompute_length();
104    }
105
106    inline void MultiSegmentPlacer::setVertex(int i, float x, float y, float z)
107    {
108        _vx[i].first.set(x, y, z);
109        recompute_length();
110    }
111
112    inline void MultiSegmentPlacer::addVertex(const osg::Vec3& v)
113    {
114        float l = 0;
115        if (_vx.size() > 0) {
116            l = (v - _vx.back().first).length();
117        }
118        _total_length += l;
119        _vx.push_back(std::make_pair(v, _total_length));
120    }
121
122    inline void MultiSegmentPlacer::addVertex(float x, float y, float z)
123    {
124        addVertex(osg::Vec3(x, y, z));
125    }
126
127    inline void MultiSegmentPlacer::removeVertex(int i)
128    {
129        _vx.erase(_vx.begin()+i);
130        recompute_length();
131    }
132
133    inline float MultiSegmentPlacer::volume() const
134    {
135        return _total_length;
136    }
137
138    inline osg::Vec3 MultiSegmentPlacer::getControlPosition() const
139    {
140        return _vx.empty() ? osg::Vec3(0.0f,0.0f,0.0f) : _vx[0].first;
141    }
142
143}
144#endif
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