QGIS API Documentation  2.99.0-Master (d55fa22)
qgsgeometryanalyzer.h
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1 /***************************************************************************
2  qgsgeometryanalyzer.h - QGIS Tools for vector geometry analysis
3  -------------------
4  begin : 19 March 2009
5  copyright : (C) Carson Farmer
6  email : [email protected]
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 QGSGEOMETRYANALYZERH
19 #define QGSGEOMETRYANALYZERH
20 
21 #include "qgsfeature.h"
22 #include "qgsgeometry.h"
23 #include "qgis_analysis.h"
24 
26 class QProgressDialog;
28 class QgsDistanceArea;
29 
34 class ANALYSIS_EXPORT QgsGeometryAnalyzer
35 {
36  public:
37 
46  bool simplify( QgsVectorLayer *layer, const QString &shapefileName, double tolerance,
47  bool onlySelectedFeatures = false, QProgressDialog *p = nullptr );
48 
56  bool centroids( QgsVectorLayer *layer, const QString &shapefileName,
57  bool onlySelectedFeatures = false, QProgressDialog *p = nullptr );
58 
65  bool extent( QgsVectorLayer *layer, const QString &shapefileName, bool onlySelectedFeatures = false, QProgressDialog *p = 0 );
66 
76  bool buffer( QgsVectorLayer *layer, const QString &shapefileName, double bufferDistance,
77  bool onlySelectedFeatures = false, bool dissolve = false, int bufferDistanceField = -1, QProgressDialog *p = nullptr );
78 
87  bool convexHull( QgsVectorLayer *layer, const QString &shapefileName, bool onlySelectedFeatures = false,
88  int uniqueIdField = -1, QProgressDialog *p = nullptr );
89 
98  bool dissolve( QgsVectorLayer *layer, const QString &shapefileName, bool onlySelectedFeatures = false,
99  int uniqueIdField = -1, QProgressDialog *p = nullptr );
100 
118  bool eventLayer( QgsVectorLayer *lineLayer, QgsVectorLayer *eventLayer, int lineField, int eventField, QgsFeatureIds &unlocatedFeatureIds, const QString &outputLayer,
119  const QString &outputFormat, int locationField1, int locationField2 = -1, int offsetField = -1, double offsetScale = 1.0,
120  bool forceSingleGeometry = false, QgsVectorDataProvider *memoryProvider = nullptr, QProgressDialog *p = nullptr );
121 
123  QgsGeometry locateBetweenMeasures( double fromMeasure, double toMeasure, const QgsGeometry &lineGeom );
124 
128  QgsGeometry locateAlongMeasure( double measure, const QgsGeometry &lineGeom );
129 
130  private:
131 
132  QList<double> simpleMeasure( QgsGeometry &geometry );
133  double perimeterMeasure( const QgsGeometry &geometry, QgsDistanceArea &measure );
135  void simplifyFeature( QgsFeature &f, QgsVectorFileWriter *vfw, double tolerance );
137  void centroidFeature( QgsFeature &f, QgsVectorFileWriter *vfw );
139  void bufferFeature( QgsFeature &f, int nProcessedFeatures, QgsVectorFileWriter *vfw, bool dissolve, QgsGeometry &dissolveGeometry,
140  double bufferDistance, int bufferDistanceField );
142  void convexFeature( QgsFeature &f, int nProcessedFeatures, QgsGeometry &dissolveGeometry );
144  QgsGeometry dissolveFeature( const QgsFeature &f, const QgsGeometry &dissolveInto );
145 
146  //helper functions for event layer
147  void addEventLayerFeature( QgsFeature &feature, const QgsGeometry &geom, const QgsGeometry &lineGeom, QgsVectorFileWriter *fileWriter, QgsFeatureList &memoryFeatures, int offsetField = -1, double offsetScale = 1.0,
148  bool forceSingleType = false );
149 
154  QgsGeometry createOffsetGeometry( const QgsGeometry &geom, const QgsGeometry &lineGeom, double offset );
155  QgsPoint createPointOffset( double x, double y, double dist, const QgsGeometry &lineGeom ) const;
156  QgsConstWkbPtr locateBetweenWkbString( QgsConstWkbPtr ptr, QgsMultiPolyline &result, double fromMeasure, double toMeasure );
157  QgsConstWkbPtr locateAlongWkbString( QgsConstWkbPtr ptr, QgsMultiPoint &result, double measure );
158  static bool clipSegmentByRange( double x1, double y1, double m1, double x2, double y2, double m2, double range1, double range2, QgsPoint &pt1, QgsPoint &pt2, bool &secondPointClipped );
159  static void locateAlongSegment( double x1, double y1, double m1, double x2, double y2, double m2, double measure, bool &pt1Ok, QgsPoint &pt1, bool &pt2Ok, QgsPoint &pt2 );
160 };
161 #endif //QGSVECTORANALYZER
QSet< QgsFeatureId > QgsFeatureIds
Definition: qgsfeature.h:519
QList< QgsFeature > QgsFeatureList
Definition: qgsfeature.h:524
A geometry is the spatial representation of a feature.
Definition: qgsgeometry.h:96
A convenience class for writing vector files to disk.
The feature class encapsulates a single feature including its id, geometry and a list of field/values...
Definition: qgsfeature.h:61
The QGis class provides vector geometry analysis functions.
QVector< QgsPoint > QgsMultiPoint
A collection of QgsPoints that share a common collection of attributes.
Definition: qgsgeometry.h:62
A class to represent a point.
Definition: qgspoint.h:37
QVector< QgsPolyline > QgsMultiPolyline
A collection of QgsPolylines that share a common collection of attributes.
Definition: qgsgeometry.h:69
A general purpose distance and area calculator, capable of performing ellipsoid based calculations...
This is the base class for vector data providers.
Represents a vector layer which manages a vector based data sets.