QGIS API Documentation  3.4.3-Madeira (2f64a3c)
qgssinglesymbolrenderer.h
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1 /***************************************************************************
2  qgssinglesymbolrenderer.h
3  ---------------------
4  begin : November 2009
5  copyright : (C) 2009 by Martin Dobias
6  email : wonder dot sk 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 #ifndef QGSSINGLESYMBOLRENDERERV2_H
16 #define QGSSINGLESYMBOLRENDERERV2_H
17 
18 #include "qgis_core.h"
19 #include "qgis.h"
20 #include "qgsrenderer.h"
21 #include "qgssymbol.h"
22 #include "qgsexpression.h"
24 
29 class CORE_EXPORT QgsSingleSymbolRenderer : public QgsFeatureRenderer
30 {
31  public:
32 
40 
41  QgsSymbol *symbolForFeature( const QgsFeature &feature, QgsRenderContext &context ) const override;
42  QgsSymbol *originalSymbolForFeature( const QgsFeature &feature, QgsRenderContext &context ) const override;
43  void startRender( QgsRenderContext &context, const QgsFields &fields ) override;
44  void stopRender( QgsRenderContext &context ) override;
45  QSet<QString> usedAttributes( const QgsRenderContext &context ) const override;
46 
51  QgsSymbol *symbol() const;
52 
58  void setSymbol( QgsSymbol *s SIP_TRANSFER );
59 
60  QString dump() const override;
61 
62  QgsSingleSymbolRenderer *clone() const override SIP_FACTORY;
63 
64  void toSld( QDomDocument &doc, QDomElement &element, const QgsStringMap &props = QgsStringMap() ) const override;
65 
73  static QgsFeatureRenderer *createFromSld( QDomElement &element, QgsWkbTypes::GeometryType geomType ) SIP_FACTORY;
74 
75  QgsFeatureRenderer::Capabilities capabilities() override { return SymbolLevels; }
76  QgsSymbolList symbols( QgsRenderContext &context ) const override;
77 
83  static QgsFeatureRenderer *create( QDomElement &element, const QgsReadWriteContext &context ) SIP_FACTORY;
84 
85  QDomElement save( QDomDocument &doc, const QgsReadWriteContext &context ) override;
86  QgsLegendSymbolList legendSymbolItems() const override;
87  QSet< QString > legendKeysForFeature( const QgsFeature &feature, QgsRenderContext &context ) const override;
88  void setLegendSymbolItem( const QString &key, QgsSymbol *symbol SIP_TRANSFER ) override;
89 
95  static QgsSingleSymbolRenderer *convertFromRenderer( const QgsFeatureRenderer *renderer ) SIP_FACTORY;
96 
107  void setDataDefinedSizeLegend( QgsDataDefinedSizeLegend *settings SIP_TRANSFER );
108 
114  QgsDataDefinedSizeLegend *dataDefinedSizeLegend() const;
115 
116  protected:
117  std::unique_ptr<QgsSymbol> mSymbol;
118  std::unique_ptr<QgsDataDefinedSizeLegend> mDataDefinedSizeLegend;
119 
120  private:
121 #ifdef SIP_RUN
123  QgsSingleSymbolRenderer &operator=( const QgsSingleSymbolRenderer & );
124 #endif
125 
126 };
127 
128 
129 #endif // QGSSINGLESYMBOLRENDERERV2_H
The class is used as a container of context for various read/write operations on other objects...
virtual QgsLegendSymbolList legendSymbolItems() const
Returns a list of symbology items for the legend.
QList< QgsLegendSymbolItem > QgsLegendSymbolList
Abstract base class for all rendered symbols.
Definition: qgssymbol.h:61
virtual void toSld(QDomDocument &doc, QDomElement &element, const QgsStringMap &props=QgsStringMap()) const
used from subclasses to create SLD Rule elements following SLD v1.1 specs
Definition: qgsrenderer.h:300
virtual QDomElement save(QDomDocument &doc, const QgsReadWriteContext &context)
store renderer info to XML element
Container of fields for a vector layer.
Definition: qgsfields.h:42
The feature class encapsulates a single feature including its id, geometry and a list of field/values...
Definition: qgsfeature.h:55
std::unique_ptr< QgsDataDefinedSizeLegend > mDataDefinedSizeLegend
QMap< QString, QString > QgsStringMap
Definition: qgis.h:570
virtual QgsSymbol * symbolForFeature(const QgsFeature &feature, QgsRenderContext &context) const =0
To be overridden.
virtual QSet< QString > usedAttributes(const QgsRenderContext &context) const =0
Returns a list of attributes required by this renderer.
QList< QgsSymbol * > QgsSymbolList
Definition: qgsrenderer.h:43
virtual QgsSymbol * originalSymbolForFeature(const QgsFeature &feature, QgsRenderContext &context) const
Returns symbol for feature.
Definition: qgsrenderer.cpp:80
#define SIP_TRANSFER
Definition: qgis_sip.h:36
QgsFeatureRenderer::Capabilities capabilities() override
Returns details about internals of this renderer.
#define SIP_FACTORY
Definition: qgis_sip.h:69
virtual void setLegendSymbolItem(const QString &key, QgsSymbol *symbol)
Sets the symbol to be used for a legend symbol item.
Rendering with symbol levels (i.e. implements symbols(), symbolForFeature())
Definition: qgsrenderer.h:242
GeometryType
The geometry types are used to group QgsWkbTypes::Type in a coarse way.
Definition: qgswkbtypes.h:138
Contains information about the context of a rendering operation.
virtual QgsSymbolList symbols(QgsRenderContext &context) const
Returns list of symbols used by the renderer.
virtual void startRender(QgsRenderContext &context, const QgsFields &fields)
Must be called when a new render cycle is started.
Definition: qgsrenderer.cpp:92
virtual void stopRender(QgsRenderContext &context)
Must be called when a render cycle has finished, to allow the renderer to clean up.
virtual QSet< QString > legendKeysForFeature(const QgsFeature &feature, QgsRenderContext &context) const
Returns legend keys matching a specified feature.
Definition: qgsrenderer.cpp:85
Object that keeps configuration of appearance of marker symbol&#39;s data-defined size in legend...
std::unique_ptr< QgsSymbol > mSymbol
virtual QgsFeatureRenderer * clone() const =0
Create a deep copy of this renderer.
virtual QString dump() const
Returns debug information about this renderer.