91 lines
3.4 KiB
Plaintext
91 lines
3.4 KiB
Plaintext
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/* -*-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_POLYTOPEINTERSECTOR
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#define OSGUTIL_POLYTOPEINTERSECTOR 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 polytope intersections with the scene graph.
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* To be used in conjunction with IntersectionVisitor. */
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class OSGUTIL_EXPORT PolytopeIntersector : public Intersector
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{
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public:
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/** Construct a PolytopeIntersector using speified polytope in MODEL coordinates.*/
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PolytopeIntersector(const osg::Polytope& polytope);
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/** Construct a PolytopeIntersector using speified polytope in specified coordinate frame.*/
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PolytopeIntersector(CoordinateFrame cf, const osg::Polytope& polytope);
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/** Convinience constructor for supporting picking in WINDOW, or PROJECTION coorindates
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* In WINDOW coordinates (clip space cube) creates a five sided polytope box that has a front face at 0.0 and sides around box xMin, yMin, xMax, yMax.
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* In PROJECTION coordinates (clip space cube) creates a five sided polytope box that has a front face at -1 and sides around box xMin, yMin, xMax, yMax.
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* In VIEW and MODEL coordinates (clip space cube) creates a five sided polytope box that has a front face at 0.0 and sides around box xMin, yMin, xMax, yMax.*/
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PolytopeIntersector(CoordinateFrame cf, double xMin, double yMin, double xMax, double yMax);
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struct Intersection
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{
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Intersection() {}
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bool operator < (const Intersection& rhs) const
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{
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if (nodePath < rhs.nodePath) return true;
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if (rhs.nodePath < nodePath ) return false;
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return (drawable < rhs.drawable);
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}
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osg::NodePath nodePath;
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osg::ref_ptr<osg::Drawable> drawable;
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};
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typedef std::set<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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PolytopeIntersector* _parent;
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osg::Polytope _polytope;
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Intersections _intersections;
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};
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}
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#endif
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