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- /* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield
- *
- * This library is open source and may be redistributed and/or modified under
- * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
- * (at your option) any later version. The full license is in LICENSE file
- * included with this distribution, and on the openscenegraph.org website.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * OpenSceneGraph Public License for more details.
- */
- //osgParticle - Copyright (C) 2002 Marco Jez
- #ifndef OSGPARTICLE_MULTISEGMENT_PLACER
- #define OSGPARTICLE_MULTISEGMENT_PLACER 1
- #include <osgParticle/Export>
- #include <osgParticle/Placer>
- #include <osgParticle/Particle>
- #include <vector>
- #include <utility>
- #include <osg/Notify>
- #include <osg/CopyOp>
- #include <osg/Object>
- #include <osg/Vec3>
- namespace osgParticle {
- /** A polyline-shaped particle placer.
- This placer class sets the position of incoming particles by choosing a random point on the
- specified sequence of connected segments.
- */
- class OSGPARTICLE_EXPORT MultiSegmentPlacer: public Placer {
- public:
- MultiSegmentPlacer();
- MultiSegmentPlacer(const MultiSegmentPlacer& copy, const osg::CopyOp& copyop = osg::CopyOp::SHALLOW_COPY);
- META_Object(osgParticle, MultiSegmentPlacer);
- /// Get the number of vertices which define the segments.
- inline int numVertices() const;
- /// Get a vertex.
- inline const osg::Vec3& getVertex(int i) const;
- /// Set a vertex.
- inline void setVertex(int i, const osg::Vec3& v);
- /// Set a vertex.
- inline void setVertex(int i, float x, float y, float z);
- /// Add a vertex.
- inline void addVertex(const osg::Vec3& v);
- /// Add a vertex.
- inline void addVertex(float x, float y, float z);
- /// Remove a vertex.
- inline void removeVertex(int i);
- /// Place a partice. Called automatically by <CODE>ModularEmitter</CODE>, do not call this method manually.
- void place(Particle* P) const;
- /// return the length of the multi-segment
- inline float volume() const;
- /// return the control position
- inline osg::Vec3 getControlPosition() const;
- protected:
- virtual ~MultiSegmentPlacer() {}
- MultiSegmentPlacer& operator=(const MultiSegmentPlacer&) { return *this; }
- private:
- typedef std::pair<osg::Vec3, float> Vertex_data;
- typedef std::vector<Vertex_data> Vertex_vector;
- Vertex_vector _vx;
- float _total_length;
- void recompute_length();
- };
- // INLINE FUNCTIONS
- inline int MultiSegmentPlacer::numVertices() const
- {
- return static_cast<int>(_vx.size());
- }
- inline const osg::Vec3& MultiSegmentPlacer::getVertex(int i) const
- {
- return _vx[i].first;
- }
- inline void MultiSegmentPlacer::setVertex(int i, const osg::Vec3& v)
- {
- _vx[i].first = v;
- recompute_length();
- }
- inline void MultiSegmentPlacer::setVertex(int i, float x, float y, float z)
- {
- _vx[i].first.set(x, y, z);
- recompute_length();
- }
- inline void MultiSegmentPlacer::addVertex(const osg::Vec3& v)
- {
- float l = 0;
- if (_vx.size() > 0) {
- l = (v - _vx.back().first).length();
- }
- _total_length += l;
- _vx.push_back(std::make_pair(v, _total_length));
- }
- inline void MultiSegmentPlacer::addVertex(float x, float y, float z)
- {
- addVertex(osg::Vec3(x, y, z));
- }
- inline void MultiSegmentPlacer::removeVertex(int i)
- {
- _vx.erase(_vx.begin()+i);
- recompute_length();
- }
- inline float MultiSegmentPlacer::volume() const
- {
- return _total_length;
- }
- inline osg::Vec3 MultiSegmentPlacer::getControlPosition() const
- {
- return _vx.empty() ? osg::Vec3(0.0f,0.0f,0.0f) : _vx[0].first;
- }
- }
- #endif
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