142 lines
5.3 KiB
C++
142 lines
5.3 KiB
C++
/* -*-c++-*- */
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/* osgEarth - Geospatial SDK for OpenSceneGraph
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* Copyright 2020 Pelican Mapping
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* http://osgearth.org
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*
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* osgEarth is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>
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*/
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#ifndef OSGEARTH_PRIMITIVE_INTERSECTOR_H
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#define OSGEARTH_PRIMITIVE_INTERSECTOR_H 1
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#include <osgUtil/IntersectionVisitor>
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#include <osgEarth/Common>
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namespace osgEarth { namespace Util
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{
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/** Concrete 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 OSGEARTH_EXPORT PrimitiveIntersector : public osgUtil::Intersector
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{
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public:
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/** Convenience constructor for supporting picking in WINDOW, or PROJECTION coordinates
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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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PrimitiveIntersector(CoordinateFrame cf, double x, double y, double thickness);
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/** Constructor for initializing with full start and end vectors. */
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PrimitiveIntersector(CoordinateFrame cf, const osg::Vec3d& start, const osg::Vec3d& end, double thickness, bool overlayIgnore=false);
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struct OSGEARTH_EXPORT 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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Intersection(const Intersection &rhs)
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{
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ratio = rhs.ratio;
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nodePath = rhs.nodePath;
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drawable = rhs.drawable;
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matrix = rhs.matrix;
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localIntersectionPoint = rhs.localIntersectionPoint;
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localIntersectionNormal = rhs.localIntersectionNormal;
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indexList = rhs.indexList;
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ratioList = rhs.ratioList;
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primitiveIndex = rhs.primitiveIndex;
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}
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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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typedef std::vector<double> RatioList;
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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::Vec3d localIntersectionNormal;
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IndexList indexList;
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RatioList ratioList;
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unsigned int primitiveIndex;
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const osg::Vec3d& getLocalIntersectPoint() const { return localIntersectionPoint; }
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osg::Vec3d getWorldIntersectPoint() const { return matrix.valid() ? localIntersectionPoint * (*matrix) : localIntersectionPoint; }
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const osg::Vec3d& getLocalIntersectNormal() const { return localIntersectionNormal; }
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osg::Vec3d getWorldIntersectNormal() const { return matrix.valid() ? osg::Matrix::transform3x3(osg::Matrix::inverse(*matrix),localIntersectionNormal) : localIntersectionNormal; }
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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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inline void setStart(const osg::Vec3d& start) { _start = start; }
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inline const osg::Vec3d& getStart() const { return _start; }
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inline void setEnd(const osg::Vec3d& end) { _end = end; }
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inline const osg::Vec3d& getEnd() const { return _end; }
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void setThickness(double thickness);
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inline double getThickness() const { return _thicknessVal; }
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inline bool getOverlayIgnore() const { return _overlayIgnore; }
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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 !getIntersections().empty(); }
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protected:
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// Internal constructor used for clone request
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PrimitiveIntersector();
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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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unsigned int findPrimitiveIndex(osg::Drawable* drawable, unsigned int index);
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PrimitiveIntersector* _parent;
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osg::Vec3d _start;
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osg::Vec3d _end;
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osg::Vec3d _thickness;
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double _thicknessVal;
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bool _overlayIgnore;
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Intersections _intersections;
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};
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} } // namespace osgEarth
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#endif //OSGEARTH_PRIMITIVE_INTERSECTOR_H
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