HeightAboveTerrain.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_HEIGHTABOVETERRAIN
#define OSGSIM_HEIGHTABOVETERRAIN 1

#include <osgUtil/IntersectionVisitor>

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

namespace osgSim {

class OSGSIM_EXPORT HeightAboveTerrain
{
    public :


        HeightAboveTerrain();


        void clear();

        unsigned int addPoint(const osg::Vec3d& point);

        unsigned int getNumPoints() const { return _HATList.size(); }

        void setPoint(unsigned int i, const osg::Vec3d& point) { _HATList[i]._point = point; }

        const osg::Vec3d& getPoint(unsigned int i) const { return _HATList[i]._point; }

        double getHeightAboveTerrain(unsigned int i) const  { return _HATList[i]._hat; }

        void setLowestHeight(double lowestHeight) { _lowestHeight = lowestHeight; }

        double getLowestHeight() const { return _lowestHeight; }

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

        static double computeHeightAboveTerrain(osg::Node* scene, const osg::Vec3d& point, osg::Node::NodeMask traversalMask=0xffffffff);


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

        void setDatabaseCacheReadCallback(DatabaseCacheReadCallback* dcrc);

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

    protected :

        struct HAT
        {
            HAT(const osg::Vec3d& point):
                _point(point),
                _hat(0.0) {}

            osg::Vec3d      _point;
            double          _hat;
        };

        typedef std::vector<HAT> HATList;


        double                                  _lowestHeight;
        HATList                                 _HATList;


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


};

}

#endif