QGIS API Documentation  3.6.0-Noosa (5873452)
qgsgeometrydegeneratepolygoncheck.cpp
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1 /***************************************************************************
2  qgsgeometrydegeneratepolygoncheck.cpp
3  ---------------------
4  begin : September 2015
5  copyright : (C) 2014 by Sandro Mani / Sourcepole AG
6  email : smani at sourcepole dot ch
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 
18 #include "qgsfeaturepool.h"
19 #include "qgsgeometrycheckerror.h"
20 
21 
22 void QgsGeometryDegeneratePolygonCheck::collectErrors( const QMap<QString, QgsFeaturePool *> &featurePools, QList<QgsGeometryCheckError *> &errors, QStringList &messages, QgsFeedback *feedback, const LayerFeatureIds &ids ) const
23 {
24  Q_UNUSED( messages )
25 
26  QMap<QString, QgsFeatureIds> featureIds = ids.isEmpty() ? allLayerFeatureIds( featurePools ) : ids.toMap();
27  QgsGeometryCheckerUtils::LayerFeatures layerFeatures( featurePools, featureIds, compatibleGeometryTypes(), feedback, mContext );
28  for ( const QgsGeometryCheckerUtils::LayerFeature &layerFeature : layerFeatures )
29  {
30  const QgsAbstractGeometry *geom = layerFeature.geometry().constGet();
31  for ( int iPart = 0, nParts = geom->partCount(); iPart < nParts; ++iPart )
32  {
33  for ( int iRing = 0, nRings = geom->ringCount( iPart ); iRing < nRings; ++iRing )
34  {
35  if ( QgsGeometryCheckerUtils::polyLineSize( geom, iPart, iRing ) < 3 )
36  {
37  QgsVertexId vidx( iPart, iRing );
38  errors.append( new QgsGeometryCheckError( this, layerFeature, geom->vertexAt( vidx ), vidx ) );
39  }
40  }
41  }
42  }
43 }
44 
45 void QgsGeometryDegeneratePolygonCheck::fixError( const QMap<QString, QgsFeaturePool *> &featurePools, QgsGeometryCheckError *error, int method, const QMap<QString, int> & /*mergeAttributeIndices*/, Changes &changes ) const
46 {
47  QgsFeaturePool *featurePool = featurePools[ error->layerId() ];
48  QgsFeature feature;
49  if ( !featurePool->getFeature( error->featureId(), feature ) )
50  {
51  error->setObsolete();
52  return;
53  }
54  QgsGeometry featureGeometry = feature.geometry();
55  const QgsAbstractGeometry *geom = featureGeometry.constGet();
56  QgsVertexId vidx = error->vidx();
57 
58  // Check if ring still exists
59  if ( !vidx.isValid( geom ) )
60  {
61  error->setObsolete();
62  return;
63  }
64 
65  // Check if error still applies
66  if ( QgsGeometryCheckerUtils::polyLineSize( geom, vidx.part, vidx.ring ) >= 3 )
67  {
68  error->setObsolete();
69  return;
70  }
71 
72  // Fix error
73  if ( method == NoChange )
74  {
75  error->setFixed( method );
76  }
77  else if ( method == DeleteRing )
78  {
79  deleteFeatureGeometryRing( featurePools, error->layerId(), feature, vidx.part, vidx.ring, changes );
80  error->setFixed( method );
81  }
82  else
83  {
84  error->setFixFailed( tr( "Unknown method" ) );
85  }
86 }
87 
89 {
90  static QStringList methods = QStringList() << tr( "Delete feature" ) << tr( "No action" );
91  return methods;
92 }
93 
95 {
97 }
QStringList resolutionMethods() const override
Returns a list of descriptions for available resolutions for errors.
bool getFeature(QgsFeatureId id, QgsFeature &feature, QgsFeedback *feedback=nullptr)
Retrieves the feature with the specified id into feature.
bool isValid() const
Returns true if the vertex id is valid.
void collectErrors(const QMap< QString, QgsFeaturePool *> &featurePools, QList< QgsGeometryCheckError *> &errors, QStringList &messages, QgsFeedback *feedback, const LayerFeatureIds &ids=LayerFeatureIds()) const override
The main worker method.
QMap< QString, QgsFeatureIds > toMap() const
Contains a set of layers and feature ids in those layers to pass to a geometry check.
CheckType
The type of a check.
static int polyLineSize(const QgsAbstractGeometry *geom, int iPart, int iRing, bool *isClosed=nullptr)
Returns the number of points in a polyline, accounting for duplicate start and end point if the polyl...
void fixError(const QMap< QString, QgsFeaturePool *> &featurePools, QgsGeometryCheckError *error, int method, const QMap< QString, int > &mergeAttributeIndices, Changes &changes) const override
Fix the error error with the specified method.
A geometry is the spatial representation of a feature.
Definition: qgsgeometry.h:106
void setObsolete()
Set the error status to obsolete.
The feature class encapsulates a single feature including its id, geometry and a list of field/values...
Definition: qgsfeature.h:55
void setFixFailed(const QString &reason)
Set the error status to failed and specify the reason for failure.
Base class for feedback objects to be used for cancelation of something running in a worker thread...
Definition: qgsfeedback.h:44
void deleteFeatureGeometryRing(const QMap< QString, QgsFeaturePool *> &featurePools, const QString &layerId, QgsFeature &feature, int partIdx, int ringIdx, Changes &changes) const
Deletes a ring in a feature geometry.
QList< QgsWkbTypes::GeometryType > compatibleGeometryTypes() const override
A list of geometry types for which this check can be performed.
Utility class for identifying a unique vertex within a geometry.
A layer feature combination to uniquely identify and access a feature in a set of layers...
static QgsGeometryCheck::CheckType factoryCheckType()
virtual int ringCount(int part=0) const =0
Returns the number of rings of which this geometry is built.
Abstract base class for all geometries.
QMap< QString, QgsFeatureIds > allLayerFeatureIds(const QMap< QString, QgsFeaturePool *> &featurePools) const
Returns all layers and feature ids.
const QString & layerId() const
The id of the layer on which this error has been detected.
const QgsGeometryCheckContext * mContext
A list of layers and feature ids for each of these layers.
const QgsAbstractGeometry * constGet() const
Returns a non-modifiable (const) reference to the underlying abstract geometry primitive.
QMap< QString, QMap< QgsFeatureId, QList< QgsGeometryCheck::Change > > > Changes
A collection of changes.
A feature pool is based on a vector layer and caches features.
void setFixed(int method)
Set the status to fixed and specify the method that has been used to fix the error.
QgsFeatureId featureId() const
The id of the feature on which this error has been detected.
QgsGeometry geometry
Definition: qgsfeature.h:67
This represents an error reported by a geometry check.
virtual QgsPoint vertexAt(QgsVertexId id) const =0
Returns the point corresponding to a specified vertex id.
const QgsVertexId & vidx() const
The id of the affected vertex.
virtual int partCount() const =0
Returns count of parts contained in the geometry.
The check controls individual nodes.