ElevationSlice.h

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/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield
 *
 * This library is open source and may be redistributed and/or modified under
 * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
 * (at your option) any later version.  The full license is in LICENSE file
 * included with this distribution, and on the openscenegraph.org website.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * OpenSceneGraph Public License for more details.
*/

#ifndef OSGSIM_ELEVATIONSLICE
#define OSGSIM_ELEVATIONSLICE 1

#include <osgUtil/IntersectionVisitor>

// include so we can get access to the DatabaseCacheReadCallback
#include <osgSim/LineOfSight>

namespace osgSim {

class OSGSIM_EXPORT ElevationSlice
{
    public :


        ElevationSlice();

        void setStartPoint(const osg::Vec3d& startPoint) { _startPoint = startPoint; }

        const osg::Vec3d& getStartPoint() const { return _startPoint; }

        void setEndPoint(const osg::Vec3d& endPoint) { _endPoint = endPoint; }

        const osg::Vec3d& getEndPoint() const { return _endPoint; }


        typedef std::vector<osg::Vec3d> Vec3dList;

        const Vec3dList& getIntersections() const  { return _intersections; }

        typedef std::pair<double,double> DistanceHeight;
        typedef std::vector<DistanceHeight> DistanceHeightList;

        const DistanceHeightList& getDistanceHeightIntersections() const { return _distanceHeightIntersections; }


        void computeIntersections(osg::Node* scene, osg::Node::NodeMask traversalMask=0xffffffff);

        static Vec3dList computeElevationSlice(osg::Node* scene, const osg::Vec3d& startPoint, const osg::Vec3d& endPoint, osg::Node::NodeMask traversalMask=0xffffffff);


        void clearDatabaseCache() { if (_dcrc.valid()) _dcrc->clearDatabaseCache(); }

        void setDatabaseCacheReadCallback(DatabaseCacheReadCallback* dcrc);

        DatabaseCacheReadCallback* getDatabaseCacheReadCallback() { return _dcrc.get(); }

    protected :


        osg::Vec3d                              _startPoint;
        osg::Vec3d                              _endPoint;
        Vec3dList                               _intersections;
        DistanceHeightList                      _distanceHeightIntersections;

        osg::ref_ptr<DatabaseCacheReadCallback> _dcrc;
        osgUtil::IntersectionVisitor            _intersectionVisitor;


};

}

#endif