QGIS API Documentation  3.21.0-Master (5b68dc587e)
qgspointclusterrenderer.h
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1 /***************************************************************************
2  qgspointclusterrenderer.h
3  -------------------------
4  begin : February 2016
5  copyright : (C) 2016 by Nyall Dawson
6  email : nyall dot dawson at gmail dot com
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 QGSPOINTCLUSTERRENDERER_H
19 #define QGSPOINTCLUSTERRENDERER_H
20 
21 #include "qgis_core.h"
22 #include "qgis.h"
24 
32 {
33  public:
34 
36 
37  QgsPointClusterRenderer *clone() const override SIP_FACTORY;
38  void startRender( QgsRenderContext &context, const QgsFields &fields ) override;
39  void stopRender( QgsRenderContext &context ) override;
40  QDomElement save( QDomDocument &doc, const QgsReadWriteContext &context ) override;
41  QSet<QString> usedAttributes( const QgsRenderContext &context ) const override;
42  bool accept( QgsStyleEntityVisitorInterface *visitor ) const override;
43 
45  static QgsFeatureRenderer *create( QDomElement &symbologyElem, const QgsReadWriteContext &context ) SIP_FACTORY;
46 
51  QgsMarkerSymbol *clusterSymbol();
52 
58  void setClusterSymbol( QgsMarkerSymbol *symbol SIP_TRANSFER );
59 
64  static QgsPointClusterRenderer *convertFromRenderer( const QgsFeatureRenderer *renderer ) SIP_FACTORY;
65 
66  private:
67 #ifdef SIP_RUN
70 #endif
71 
73  std::unique_ptr< QgsMarkerSymbol > mClusterSymbol;
74 
75  void drawGroup( QPointF centerPoint, QgsRenderContext &context, const QgsPointDistanceRenderer::ClusteredGroup &group ) override SIP_FORCE;
76 
77 };
78 
79 #endif // QGSPOINTCLUSTERRENDERER_H
virtual QgsFeatureRenderer * clone() const =0
Create a deep copy of this renderer.
virtual QDomElement save(QDomDocument &doc, const QgsReadWriteContext &context)
Stores renderer properties to an XML element.
Container of fields for a vector layer.
Definition: qgsfields.h:45
A marker symbol type, for rendering Point and MultiPoint geometries.
A renderer that automatically clusters points with the same geographic position.
An abstract base class for distance based point renderers (e.g., clusterer and displacement renderers...
void stopRender(QgsRenderContext &context) override
Must be called when a render cycle has finished, to allow the renderer to clean up.
void startRender(QgsRenderContext &context, const QgsFields &fields) override
Must be called when a new render cycle is started.
QSet< QString > usedAttributes(const QgsRenderContext &context) const override
Returns a list of attributes required by this renderer.
QList< QgsPointDistanceRenderer::GroupedFeature > ClusteredGroup
A group of clustered points (ie features within the distance tolerance).
bool accept(QgsStyleEntityVisitorInterface *visitor) const override
Accepts the specified symbology visitor, causing it to visit all symbols associated with the renderer...
The class is used as a container of context for various read/write operations on other objects.
Contains information about the context of a rendering operation.
An interface for classes which can visit style entity (e.g.
#define SIP_FORCE
Definition: qgis_sip.h:131
#define SIP_TRANSFER
Definition: qgis_sip.h:36
#define SIP_FACTORY
Definition: qgis_sip.h:76