QGIS API Documentation  3.9.0-Master (224899f119)
qgsellipsoidutils.h
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1 /***************************************************************************
2  qgsellipsoidutils.h
3  --------------------
4  Date : April 2017
5  Copyright : (C) 2017 by Nyall Dawson
6  email : nyall dot dawson at gmail dot com
7  ***************************************************************************
8  * *
9  * This program is free software; you can redistribute it and/or modify *
10  * it under the terms of the GNU General Public License as published by *
11  * the Free Software Foundation; either version 2 of the License, or *
12  * (at your option) any later version. *
13  * *
14  ***************************************************************************/
15 
16 #ifndef QGSELLIPSOIDUTILS_H
17 #define QGSELLIPSOIDUTILS_H
18 
19 #include "qgis_core.h"
20 #include "qgis_sip.h"
22 #include <QStringList>
23 
31 class CORE_EXPORT QgsEllipsoidUtils
32 {
33  public:
34 
40  {
42  bool valid{ true };
43 
45  double semiMajor{ -1.0 };
47  double semiMinor{ -1.0 };
48 
50  bool useCustomParameters{ false };
51 
53  double inverseFlattening{ -1.0 };
54 
57  };
58 
64  {
66  QString acronym;
68  QString description;
71  };
72 
77  static EllipsoidParameters ellipsoidParameters( const QString &ellipsoid );
78 
84  static QList< QgsEllipsoidUtils::EllipsoidDefinition > definitions();
85 
91  static QStringList acronyms();
92 
93  private:
94 
95  // ellipsoid cache
96  static QReadWriteLock sEllipsoidCacheLock;
97  static QHash< QString, EllipsoidParameters > sEllipsoidCache;
98  static QReadWriteLock sDefinitionCacheLock;
99  static QList< QgsEllipsoidUtils::EllipsoidDefinition > sDefinitionCache;
100 
101 };
102 
103 #endif // QGSELLIPSOIDUTILS_H
104 
Contains definition of an ellipsoid.
Contains parameters for an ellipsoid.
QgsCoordinateReferenceSystem crs
Associated coordinate reference system.
QString acronym
authority:code for QGIS builds with proj version 6 or greater, or custom acronym for ellipsoid for ea...
Contains utility functions for working with ellipsoids and querying the ellipsoid database...
This class represents a coordinate reference system (CRS).
QgsEllipsoidUtils::EllipsoidParameters parameters
Ellipsoid parameters.
QString description
Description of ellipsoid.