QGIS API Documentation  2.6.0-Brighton
 All Classes Namespaces Files Functions Variables Typedefs Enumerations Enumerator Properties Friends Macros Groups Pages
qgsgeometrysimplifier.h
Go to the documentation of this file.
1 /***************************************************************************
2  qgsgeometrysimplifier.h
3  ---------------------
4  begin : December 2013
5  copyright : (C) 2013 by Alvaro Huarte
6  email : http://wiki.osgeo.org/wiki/Alvaro_Huarte
7 
8  ***************************************************************************
9  * *
10  * This program is free software; you can redistribute it and/or modify *
11  * it under the terms of the GNU General Public License as published by *
12  * the Free Software Foundation; either version 2 of the License, or *
13  * (at your option) any later version. *
14  * *
15  ***************************************************************************/
16 
17 #ifndef QGSGEOMETRYSIMPLIFIER_H
18 #define QGSGEOMETRYSIMPLIFIER_H
19 
20 #include "qgsgeometry.h"
21 
26 {
27  public:
29 
31  virtual QgsGeometry* simplify( QgsGeometry* geometry ) const = 0;
33  virtual bool simplifyGeometry( QgsGeometry* geometry ) const = 0;
34 
35  // MapToPixel simplification helper methods
36  public:
38  static bool isGeneralizableByDeviceBoundingBox( const QgsRectangle& envelope, float mapToPixelTol = 1.0f );
40  static bool isGeneralizableByDeviceBoundingBox( const QVector<QPointF>& points, float mapToPixelTol = 1.0f );
41 };
42 
43 /***************************************************************************/
51 {
52  public:
53  QgsTopologyPreservingSimplifier( double tolerance );
55 
56  protected:
58  double mTolerance;
59 
60  public:
62  virtual QgsGeometry* simplify( QgsGeometry* geometry ) const;
64  virtual bool simplifyGeometry( QgsGeometry* geometry ) const;
65 };
66 
67 #endif // QGSGEOMETRYSIMPLIFIER_H