76 lines
2.9 KiB
C++
76 lines
2.9 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_UTIL_VIEW_FITTER_H
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#define OSGEARTH_UTIL_VIEW_FITTER_H
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#include <osgEarth/Common>
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#include <osgEarth/GeoData>
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#include <osgEarth/Viewpoint>
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#include <osg/Camera>
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namespace osgEarth { namespace Util
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{
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/**
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* Creates Viewpoints that fit a camera's view frustum to encompass
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* a set of geospatial points as tightly as possible.
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*/
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class OSGEARTH_EXPORT ViewFitter
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{
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public:
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//! Construct a ViewFitter with a Map SRS and a camera.
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ViewFitter(const SpatialReference* mapSRS, const osg::Camera* camera);
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//! Creates a Viewpoint that looks straight down on the map and
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//! encompasses the provided set of points.
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//! Returns true upon success, or false if there is missing data or if
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//! the camera is orthographic.
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bool createViewpoint(const std::vector<GeoPoint>& points, Viewpoint& out) const;
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//! Creates a Viewpoint that looks straight down on the map and
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//! encompasses the provided extent.
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//! Returns true upon success, or false if there is missing data or if
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//! the camera is orthographic.
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bool createViewpoint(const GeoExtent& extent, Viewpoint& out) const;
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//! Creates a Viewpoint that looks straight down on the map and
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//! encompasses the specified node.
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//! Returns true upon success, or false if there is missing data or if
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//! the camera is orthographic.
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bool createViewpoint(const osg::Node* node, Viewpoint& out) const;
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//! Sets a buffer (in meters) to apply to the view fit. Applying a buffer will
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//! expand the view so that the points are at least "buffer" meters inside the
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//! edge of the fitted view.
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void setBuffer(double value_meters) { _buffer_m = value_meters; }
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double getBuffer() const { return _buffer_m; }
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//! Sets the reference VFOV when using an orthographic camera.
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void setReferenceVFOV(float vfov_degrees) { _vfov = vfov_degrees; }
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protected:
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osg::ref_ptr<const osg::Camera> _camera;
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osg::ref_ptr<const SpatialReference> _mapSRS;
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float _vfov;
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double _buffer_m;
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};
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} }
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#endif // OSGEARTH_UTIL_VIEW_FITTER_H
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