78 lines
2.5 KiB
Plaintext
78 lines
2.5 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_LOCATORS_H
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#define OSGEARTH_LOCATORS_H 1
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#include <osgEarth/Common>
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#include <osgEarth/GeoData>
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#include <osg/Matrixd>
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namespace osgEarth { namespace Util
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{
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/**
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* Object that facilitates the conversion between map or world coordinates
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* and a local unit coordinate space defined by a geospatial extent.
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*/
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class /* header only */ GeoLocator
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{
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public:
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//! Construct with an extent that defines the unit [0..1] space
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GeoLocator(const GeoExtent& extent)
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{
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_extent = extent;
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_srs = extent.getSRS();
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_transform.set(
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extent.width(), 0.0, 0.0, 0.0,
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0.0, extent.height(), 0.0, 0.0,
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0.0, 0.0, 1.0, 0.0,
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extent.xMin(), extent.yMin(), 0.0, 1.0);
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_inverse.invert(_transform);
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}
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//! Convert world coordinates to unit space
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inline void worldToUnit(const osg::Vec3d& world, osg::Vec3d& unit) const
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{
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if (_srs->isGeographic())
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unit = _srs->getEllipsoid().geocentricToGeodetic(world) * _inverse;
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else
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unit = world * _inverse;
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}
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//! Convert unit coordinates to world space
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inline void unitToWorld(const osg::Vec3d& unit, osg::Vec3d& world) const
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{
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world = unit * _transform;
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if (_srs->isGeographic())
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world = _srs->getEllipsoid().geodeticToGeocentric(world);
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}
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GeoExtent _extent;
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osg::Matrixd _transform;
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osg::Matrixd _inverse;
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double _x0, _y0, _x1, _y1;
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osg::ref_ptr<const SpatialReference> _srs;
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};
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} }
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#endif // OSGEARTH_LOCATORS_H
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