100 lines
3.8 KiB
C++
100 lines
3.8 KiB
C++
/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield
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*
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* This library is open source and may be redistributed and/or modified under
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* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
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* (at your option) any later version. The full license is in LICENSE file
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* included with this distribution, and on the openscenegraph.org website.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* OpenSceneGraph Public License for more details.
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*/
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#ifndef OSGUTIL_LINESEGMENTINTERSECTOR
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#define OSGUTIL_LINESEGMENTINTERSECTOR 1
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#include <osgUtil/IntersectionVisitor>
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namespace osgUtil
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{
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/** Concrent class for implementing line intersections with the scene graph.
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* To be used in conjunction with IntersectionVisitor. */
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class OSGUTIL_EXPORT LineSegmentIntersector : public Intersector
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{
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public:
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/** Construct a LineSegmentIntersector the runs between the secified start and end points in MODEL coordinates. */
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LineSegmentIntersector(const osg::Vec3d& start, const osg::Vec3d& end);
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/** Construct a LineSegmentIntersector the runs between the secified start and end points in the specified coordinate frame. */
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LineSegmentIntersector(CoordinateFrame cf, const osg::Vec3d& start, const osg::Vec3d& end);
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/** Convinience constructor for supporting picking in WINDOW, or PROJECTION coorindates
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* In WINDOW coordinates creates a start value of (x,y,0) and end value of (x,y,1).
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* In PROJECTION coordinates (clip space cube) creates a start value of (x,y,-1) and end value of (x,y,1).
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* In VIEW and MODEL coordinates creates a start value of (x,y,0) and end value of (x,y,1).*/
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LineSegmentIntersector(CoordinateFrame cf, double x, double y);
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struct Intersection
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{
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Intersection():
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ratio(-1.0),
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primitiveIndex(0) {}
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bool operator < (const Intersection& rhs) const { return ratio < rhs.ratio; }
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typedef std::vector<unsigned int> IndexList;
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double ratio;
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osg::NodePath nodePath;
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osg::ref_ptr<osg::Drawable> drawable;
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osg::ref_ptr<osg::RefMatrix> matrix;
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osg::Vec3d localIntersectionPoint;
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osg::Vec3 localIntersectionNormal;
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IndexList indexList;
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unsigned int primitiveIndex;
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};
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typedef std::multiset<Intersection> Intersections;
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inline void insertIntersection(const Intersection& intersection) { getIntersections().insert(intersection); }
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inline Intersections& getIntersections() { return _parent ? _parent->_intersections : _intersections; }
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inline Intersection getFirstIntersection() { Intersections& intersections = getIntersections(); return intersections.empty() ? Intersection() : *(intersections.begin()); }
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public:
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virtual Intersector* clone(osgUtil::IntersectionVisitor& iv);
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virtual bool enter(const osg::Node& node);
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virtual void leave();
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virtual void intersect(osgUtil::IntersectionVisitor& iv, osg::Drawable* drawable);
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virtual void reset();
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virtual bool containsIntersections() { return !_intersections.empty(); }
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protected:
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bool intersects(const osg::BoundingSphere& bs);
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bool intersectAndClip(osg::Vec3d& s, osg::Vec3d& e,const osg::BoundingBox& bb);
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LineSegmentIntersector* _parent;
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osg::Vec3d _start;
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osg::Vec3d _end;
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Intersections _intersections;
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};
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}
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#endif
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