1 | /* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield |
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2 | * |
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3 | * This library is open source and may be redistributed and/or modified under |
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4 | * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or |
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5 | * (at your option) any later version. The full license is in LICENSE file |
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6 | * included with this distribution, and on the openscenegraph.org website. |
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7 | * |
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8 | * This library is distributed in the hope that it will be useful, |
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9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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11 | * OpenSceneGraph Public License for more details. |
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12 | */ |
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13 | //osgParticle - Copyright (C) 2002 Marco Jez |
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14 | |
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15 | #ifndef OSGPARTICLE_MULTISEGMENT_PLACER |
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16 | #define OSGPARTICLE_MULTISEGMENT_PLACER 1 |
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17 | |
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18 | #include <osgParticle/Export> |
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19 | #include <osgParticle/Placer> |
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20 | #include <osgParticle/Particle> |
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21 | |
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22 | #include <vector> |
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23 | #include <utility> |
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24 | |
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25 | #include <osg/Notify> |
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26 | #include <osg/CopyOp> |
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27 | #include <osg/Object> |
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28 | #include <osg/Vec3> |
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29 | |
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30 | namespace osgParticle { |
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31 | |
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32 | /** A polyline-shaped particle placer. |
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33 | This placer class sets the position of incoming particles by choosing a random point on the |
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34 | specified sequence of connected segments. |
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35 | */ |
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36 | class OSGPARTICLE_EXPORT MultiSegmentPlacer: public Placer { |
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37 | public: |
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38 | MultiSegmentPlacer(); |
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39 | MultiSegmentPlacer(const MultiSegmentPlacer& copy, const osg::CopyOp& copyop = osg::CopyOp::SHALLOW_COPY); |
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40 | |
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41 | META_Object(osgParticle, MultiSegmentPlacer); |
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42 | |
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43 | /// Get the number of vertices which define the segments. |
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44 | inline int numVertices() const; |
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45 | |
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46 | /// Get a vertex. |
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47 | inline const osg::Vec3& getVertex(int i) const; |
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48 | |
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49 | /// Set a vertex. |
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50 | inline void setVertex(int i, const osg::Vec3& v); |
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51 | |
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52 | /// Set a vertex. |
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53 | inline void setVertex(int i, float x, float y, float z); |
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54 | |
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55 | /// Add a vertex. |
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56 | inline void addVertex(const osg::Vec3& v); |
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57 | |
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58 | /// Add a vertex. |
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59 | inline void addVertex(float x, float y, float z); |
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60 | |
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61 | /// Remove a vertex. |
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62 | inline void removeVertex(int i); |
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63 | |
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64 | /// Place a partice. Called automatically by <CODE>ModularEmitter</CODE>, do not call this method manually. |
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65 | void place(Particle* P) const; |
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66 | |
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67 | /// return the length of the multi-segment |
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68 | inline float volume() const; |
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69 | |
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70 | /// return the control position |
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71 | inline osg::Vec3 getControlPosition() const; |
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72 | |
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73 | protected: |
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74 | virtual ~MultiSegmentPlacer() {} |
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75 | MultiSegmentPlacer& operator=(const MultiSegmentPlacer&) { return *this; } |
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76 | |
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77 | private: |
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78 | typedef std::pair<osg::Vec3, float> Vertex_data; |
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79 | typedef std::vector<Vertex_data> Vertex_vector; |
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80 | |
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81 | Vertex_vector _vx; |
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82 | float _total_length; |
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83 | |
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84 | void recompute_length(); |
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85 | }; |
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86 | |
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87 | // INLINE FUNCTIONS |
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88 | |
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89 | |
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90 | inline int MultiSegmentPlacer::numVertices() const |
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91 | { |
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92 | return static_cast<int>(_vx.size()); |
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93 | } |
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94 | |
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95 | inline const osg::Vec3& MultiSegmentPlacer::getVertex(int i) const |
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96 | { |
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97 | return _vx[i].first; |
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98 | } |
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99 | |
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100 | inline void MultiSegmentPlacer::setVertex(int i, const osg::Vec3& v) |
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101 | { |
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102 | _vx[i].first = v; |
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103 | recompute_length(); |
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104 | } |
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105 | |
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106 | inline void MultiSegmentPlacer::setVertex(int i, float x, float y, float z) |
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107 | { |
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108 | _vx[i].first.set(x, y, z); |
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109 | recompute_length(); |
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110 | } |
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111 | |
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112 | inline void MultiSegmentPlacer::addVertex(const osg::Vec3& v) |
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113 | { |
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114 | float l = 0; |
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115 | if (_vx.size() > 0) { |
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116 | l = (v - _vx.back().first).length(); |
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117 | } |
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118 | _total_length += l; |
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119 | _vx.push_back(std::make_pair(v, _total_length)); |
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120 | } |
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121 | |
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122 | inline void MultiSegmentPlacer::addVertex(float x, float y, float z) |
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123 | { |
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124 | addVertex(osg::Vec3(x, y, z)); |
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125 | } |
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126 | |
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127 | inline void MultiSegmentPlacer::removeVertex(int i) |
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128 | { |
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129 | _vx.erase(_vx.begin()+i); |
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130 | recompute_length(); |
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131 | } |
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132 | |
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133 | inline float MultiSegmentPlacer::volume() const |
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134 | { |
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135 | return _total_length; |
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136 | } |
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137 | |
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138 | inline osg::Vec3 MultiSegmentPlacer::getControlPosition() const |
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139 | { |
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140 | return _vx.empty() ? osg::Vec3(0.0f,0.0f,0.0f) : _vx[0].first; |
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141 | } |
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142 | |
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143 | } |
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144 | #endif |
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