QGIS API Documentation  3.21.0-Master (909859188c)
qgstolerance.h
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1 /***************************************************************************
2  qgstolerance.h - wrapper for tolerance handling
3  ----------------------
4  begin : March 2009
5  copyright : (C) 2009 by Richard Kostecky
6  email : csf.kostej at gmail dot com
7  ***************************************************************************
8  * *
9  * This program is free software; you can redistribute it and/or modify *
10  * it under the terms of the GNU General Public License as published by *
11  * the Free Software Foundation; either version 2 of the License, or *
12  * (at your option) any later version. *
13  * *
14  ***************************************************************************/
15 
16 #ifndef QGSTOLERANCE_H
17 #define QGSTOLERANCE_H
18 
19 #include <QObject>
20 
21 #include "qgis_core.h"
22 #include "qgis_sip.h"
23 
24 class QgsMapSettings;
25 class QgsMapLayer;
26 class QgsPointXY;
27 
32 class CORE_EXPORT QgsTolerance
33 {
34  Q_GADGET
35  public:
36 
41  enum UnitType
42  {
48  ProjectUnits
49  };
50  Q_ENUM( UnitType )
51 
52 
58  static double vertexSearchRadius( const QgsMapSettings &mapSettings );
59 
65  static double vertexSearchRadius( QgsMapLayer *layer, const QgsMapSettings &mapSettings );
66 
72  static double defaultTolerance( QgsMapLayer *layer, const QgsMapSettings &mapSettings );
73 
83  static double toleranceInProjectUnits( double tolerance, QgsMapLayer *layer, const QgsMapSettings &mapSettings, QgsTolerance::UnitType units );
84 
93  static double toleranceInMapUnits( double tolerance, QgsMapLayer *layer, const QgsMapSettings &mapSettings, UnitType units = LayerUnits );
94 
95  private:
96  static double computeMapUnitPerPixel( QgsMapLayer *layer, const QgsMapSettings &mapSettings );
97  static QgsPointXY toLayerCoordinates( QgsMapLayer *layer, const QgsMapSettings &mapSettings, QPoint point );
98 
99 };
100 
101 #endif
Base class for all map layer types.
Definition: qgsmaplayer.h:72
The QgsMapSettings class contains configuration for rendering of the map.
A class to represent a 2D point.
Definition: qgspointxy.h:59
This is the class is providing tolerance value in map unit values.
Definition: qgstolerance.h:33
UnitType
Type of unit of tolerance value from settings.
Definition: qgstolerance.h:42
@ Pixels
Pixels unit of tolerance.
Definition: qgstolerance.h:46
@ LayerUnits
Layer unit value.
Definition: qgstolerance.h:44