70 lines
2.8 KiB
C++
70 lines
2.8 KiB
C++
/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2003 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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// PickIntersectVisitor == Pick visitor - used for screen based picking
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// based on osgUtil::IntersectVisitor BUT
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// traversing into Projection Nodes using the modified projections.
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// also supplies high level intersector for 'what is under a pixel in a sceneview'
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// GWM Feb 2003.
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#ifndef OSGUTIL_PICKINTERSECTVISITOR
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#define OSGUTIL_PICKINTERSECTVISITOR 1
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#include <osgUtil/IntersectVisitor>
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#include <osgUtil/SceneView>
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namespace osgUtil {
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// PickIntersectVisitor simplifies picking - routines take x,y mouse pixel & detect hits
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class OSGUTIL_EXPORT PickIntersectVisitor : public IntersectVisitor
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{
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public:
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PickIntersectVisitor()
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{
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setNodeMaskOverride(0xffffffff); // need to make the visitor override the nodemask to visit invisible actions
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}
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~PickIntersectVisitor() { }
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HitList& getHits(osgUtil::SceneView *, int x, int y);
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HitList& PickIntersectVisitor::getIntersections(osg::Node *scene, osg::Vec3 nr, osg::Vec3 fr);
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private:
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osg::ref_ptr<osg::LineSegment> _lineSegment;
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friend class osgUtil::IntersectVisitor;
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};
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// PickVisitor traverses whole scene and checks below all Projection nodes
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class OSGUTIL_EXPORT PickVisitor : public osg::NodeVisitor
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{
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public:
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PickVisitor()
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{
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xp=yp=0;
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setNodeMaskOverride(0xffffffff); // need to make the visitor override the nodemask to visit invisible actions
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setTraversalMode(osg::NodeVisitor::TRAVERSE_ALL_CHILDREN);
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}
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~PickVisitor() { }
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virtual void apply(osg::Projection& pr);
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osgUtil::IntersectVisitor::HitList& getHits(osg::Node *nd, const osg::Matrix &projm, const float x, const float y);
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osgUtil::IntersectVisitor::HitList& getHits(osgUtil::SceneView *, double x, double y);
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osgUtil::IntersectVisitor::HitList & getHits(osg::Node *nd, const osg::Vec3 near_point, const osg::Vec3 far_point);
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osgUtil::IntersectVisitor::HitList& getHits(void);
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inline void setxy(float xpt, float ypt) { xp=xpt; yp=ypt; }
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inline bool hits() { return _PIVsegHitList.size()>0;}
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private:
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PickIntersectVisitor _piv;
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float xp, yp; // start point in viewport fraction coordiantes
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osgUtil::IntersectVisitor::HitList _PIVsegHitList;
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};
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}// namespace osgUtil
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#endif // match OSGUTIL_PICKINTERSECTVISITOR
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