QGIS API Documentation  2.99.0-Master (6a61179)
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 #include <QReadWriteLock>
24 
26 
30 class CORE_EXPORT QgsCoordinateTransformCache
31 {
32  public:
33  static QgsCoordinateTransformCache* instance();
34 
36 
44  QgsCoordinateTransform transform( const QString& srcAuthId, const QString& destAuthId, int srcDatumTransform = -1, int destDatumTransform = -1 );
45 
47  void invalidateCrs( const QString& crsAuthId );
48 
49  private:
50  QMultiHash< QPair< QString, QString >, QgsCoordinateTransform > mTransforms; //same auth_id pairs might have different datum transformations
51 
55 };
56 
57 #endif // QGSCRSCACHE_H
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:30