QGIS API Documentation  2.99.0-Master (5b186ae)
qgsgeometrysimplifier.h
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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 <QVector>
21 #include <QPointF>
22 
23 class QgsGeometry;
24 class QgsRectangle;
25 
26 #include "qgis_core.h"
27 
32 {
33  public:
34  virtual ~QgsAbstractGeometrySimplifier() = default;
35 
37  virtual QgsGeometry simplify( const QgsGeometry &geometry ) const = 0;
38 
39  // MapToPixel simplification helper methods
40  public:
42  static bool isGeneralizableByDeviceBoundingBox( const QgsRectangle &envelope, float mapToPixelTol = 1.0f );
44  static bool isGeneralizableByDeviceBoundingBox( const QVector<QPointF> &points, float mapToPixelTol = 1.0f );
45 };
46 
47 /***************************************************************************/
48 
56 {
57  public:
58 
63  QgsTopologyPreservingSimplifier( double tolerance );
64 
65  virtual QgsGeometry simplify( const QgsGeometry &geometry ) const override;
66 
67  protected:
69  double mTolerance;
70 
71 };
72 
73 #endif // QGSGEOMETRYSIMPLIFIER_H
Implementation of GeometrySimplifier using the Douglas-Peucker algorithm.
A rectangle specified with double values.
Definition: qgsrectangle.h:38
A geometry is the spatial representation of a feature.
Definition: qgsgeometry.h:96
double mTolerance
Distance tolerance for the simplification.
virtual QgsGeometry simplify(const QgsGeometry &geometry) const =0
Returns a simplified version the specified geometry.
Abstract base class for simplify geometries using a specific algorithm.