QGIS API Documentation  2.15.0-Master (1f0fce7)
qgscrscache.h
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1 /***************************************************************************
2  qgscrscache.h
3  --------------
4  begin : September 6th, 2011
5  copyright : (C) 2011 by Marco Hugentobler
6  email : marco dot hugentobler at sourcepole dot ch
7  ***************************************************************************/
8 
9 /***************************************************************************
10  * *
11  * This program is free software; you can redistribute it and/or modify *
12  * it under the terms of the GNU General Public License as published by *
13  * the Free Software Foundation; either version 2 of the License, or *
14  * (at your option) any later version. *
15  * *
16  ***************************************************************************/
17 
18 #ifndef QGSCRSCACHE_H
19 #define QGSCRSCACHE_H
20 
22 #include <QHash>
23 
25 
28 class CORE_EXPORT QgsCoordinateTransformCache
29 {
30  public:
31  static QgsCoordinateTransformCache* instance();
32 
40  const QgsCoordinateTransform* transform( const QString& srcAuthId, const QString& destAuthId, int srcDatumTransform = -1, int destDatumTransform = -1 );
42  void invalidateCrs( const QString& crsAuthId );
43 
44  private:
45  QMultiHash< QPair< QString, QString >, QgsCoordinateTransform* > mTransforms; //same auth_id pairs might have different datum transformations
46 
50 };
51 
52 
53 
65 class CORE_EXPORT QgsCRSCache
66 {
67  public:
68 
70  static QgsCRSCache* instance();
71 
75  Q_DECL_DEPRECATED QgsCoordinateReferenceSystem crsByAuthId( const QString& authid );
76 
83  QgsCoordinateReferenceSystem crsByOgcWmsCrs( const QString& ogcCrs ) const;
84 
89  QgsCoordinateReferenceSystem crsByEpsgId( long epsg ) const;
90 
97  QgsCoordinateReferenceSystem crsByProj4( const QString& proj4 ) const;
98 
103  void updateCRSCache( const QString& authid );
104 
105  protected:
106  QgsCRSCache();
107 
108  private:
109 
112 
114  QgsCoordinateReferenceSystem mInvalidCRS;
115 };
116 
117 #endif // QGSCRSCACHE_H
Caches QgsCoordinateReferenceSystem construction, which may be expensive.
Definition: qgscrscache.h:65
Class for storing a coordinate reference system (CRS)
Class for doing transforms between two map coordinate systems.
Cache coordinate transform by authid of source/dest transformation to avoid the overhead of initializ...
Definition: qgscrscache.h:28