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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();
39  const QgsCoordinateTransform* transform( const QString& srcAuthId, const QString& destAuthId, int srcDatumTransform = -1, int destDatumTransform = -1 );
41  void invalidateCrs( const QString& crsAuthId );
42 
43  private:
44  static QgsCoordinateTransformCache* mInstance;
45  QMultiHash< QPair< QString, QString >, QgsCoordinateTransform* > mTransforms; //same auth_id pairs might have different datum transformations
46 };
47 
48 class CORE_EXPORT QgsCRSCache
49 {
50  public:
51  static QgsCRSCache* instance();
52  ~QgsCRSCache();
54  const QgsCoordinateReferenceSystem& crsByAuthId( const QString& authid );
55  const QgsCoordinateReferenceSystem& crsByEpsgId( long epsg );
56 
57  void updateCRSCache( const QString &authid );
58 
59  protected:
60  QgsCRSCache();
61 
62  private:
63  QHash< QString, QgsCoordinateReferenceSystem > mCRS;
65  QgsCoordinateReferenceSystem mInvalidCRS;
66 };
67 
68 #endif // QGSCRSCACHE_H
Definition: qgscrscache.h:48
Class for storing a coordinate reference system (CRS)
Definition: qgscoordinatereferencesystem.h:50
Class for doing transforms between two map coordinate systems.
Definition: qgscoordinatetransform.h:52
Cache coordinate transform by authid of source/dest transformation to avoid the overhead of initialis...
Definition: qgscrscache.h:28