124 lines
4.2 KiB
Plaintext
124 lines
4.2 KiB
Plaintext
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/* -*-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_INTERSECTION_PICKER_H
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#define OSGEARTH_INTERSECTION_PICKER_H
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#include <osgEarth/Common>
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#include <osgEarth/ObjectIndex>
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#include <osgEarth/PrimitiveIntersector>
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#include <osgViewer/View>
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#include <osgEarth/Feature>
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namespace osgEarth
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{
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/**
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* Utility for picking objects from the scene.
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*
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* Please consider the RTTPicker instead unless you need to pick
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* multiple overlapping objects in the scene. RTTPicker offers more
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* complete support (for annotations, shader-based geometry, etc.)
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* than IntersectionPicker.
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*/
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class OSGEARTH_EXPORT IntersectionPicker
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{
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public:
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typedef osgEarth::PrimitiveIntersector::Intersection Hit;
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typedef osgEarth::PrimitiveIntersector::Intersections Hits;
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enum Limit {
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NO_LIMIT,
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LIMIT_ONE_PER_DRAWABLE,
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LIMIT_ONE,
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LIMIT_NEAREST
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};
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public:
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/**
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* Constructs a picker that will pick data from the given view,
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* and restrict its search to the given graph.
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*
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* @param view View under which to pick
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* @param graph Subgraph within which to restrict the pick
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* @param traversalMask Node mask to apply to the pick visitor
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* @param buffer Pick buffer around the click (pixels)
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*/
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IntersectionPicker(
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osgViewer::View* view,
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osg::Node* graph =0L,
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unsigned traversalMask =~0,
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float buffer =5.0f,
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Limit limit =LIMIT_NEAREST);
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/** dtor */
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virtual ~IntersectionPicker() { }
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/**
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* Sets the node mask to apply to the pick visitor. This lets you
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* limit the subgraph that the picker searches.
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*/
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void setTraversalMask(unsigned mask);
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/**
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* Sets the search buffer around the mouse.
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*/
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void setBuffer(float buffer);
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/**
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* Sets the hit limit mode.
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*/
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void setLimit(const Limit& limit);
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/**
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* Picks geometry under the specified viewport coordinates. The results
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* are stores in "results". You can typically get the mouseX and mouseY
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* from osgGA::GUIEventAdapter getX() and getY().
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*/
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bool pick( float mouseX, float mouseY, Hits& results ) const;
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/**
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* Finds and returns the lowest node of type "T" in a hit, or 0L if no such
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* node exists.
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*/
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template<typename T>
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T* getNode( const Hit& hit ) const {
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for( osg::NodePath::const_reverse_iterator i = hit.nodePath.rbegin(); i != hit.nodePath.rend(); ++i ) {
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T* node = dynamic_cast<T*>(*i);
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if ( node ) return node;
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}
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return 0L;
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}
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/**
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* Given a set of pick results, extract the object IDs within.
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* Results true is the output connection is populated.
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*/
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bool getObjectIDs(const Hits& results, std::set<ObjectID>& out_objectIDs) const;
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protected:
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osgViewer::View* _view;
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osg::ref_ptr<osg::Node> _root;
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osg::NodePath _path;
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unsigned _travMask;
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float _buffer;
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Limit _limit;
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};
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}
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#endif // OSGEARTH_INTERSECTION_PICKER_H
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