72 lines
2.3 KiB
C++
72 lines
2.3 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_LOCAL_TANGENT_PLANE_H
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#define OSGEARTH_LOCAL_TANGENT_PLANE_H 1
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#include <osgEarth/Common>
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#include <osgEarth/Profile>
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#include <osgEarth/TileKey>
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namespace osgEarth
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{
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/**
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* Local Tangent Plane SRS.
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* Please call SpatialReference::createLTP() to construct one of these.
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*/
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class TangentPlaneSpatialReference : public SpatialReference
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{
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public:
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//! New LTP SRS
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//! @param key Key of underlying geographic SRS
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//! @param originLLA lat/long/alt origin of reference point
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TangentPlaneSpatialReference(
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const Key& key,
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const osg::Vec3d& originLLA);
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public: // SpatialReference
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bool isGeographic() const override { return false; }
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bool isProjected() const override { return true; }
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bool isLTP() const override { return true; }
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// This SRS uses a WGS84 lat/long SRS under the hood for reprojection.
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// So we need the pre/post transforms to move from LTP to LLA and back.
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const SpatialReference* preTransform(std::vector<osg::Vec3d>& points) const override;
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const SpatialReference* postTransform(std::vector<osg::Vec3d>& points) const override;
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protected: // SpatialReference
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bool _isEquivalentTo(
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const SpatialReference* srs,
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bool considerVDatum =true ) const override;
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virtual ~TangentPlaneSpatialReference() { }
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private:
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osg::Vec3d _originLLA;
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osg::Matrixd _local2world, _world2local;
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};
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}
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#endif // OSGEARTH_LOCAL_TANGENT_PLANE_H
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