QGIS API Documentation  3.9.0-Master (224899f119)
qgsvectorlayerrenderer.h
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1 /***************************************************************************
2  qgsvectorlayerrenderer.h
3  --------------------------------------
4  Date : December 2013
5  Copyright : (C) 2013 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 
16 #ifndef QGSVECTORLAYERRENDERER_H
17 #define QGSVECTORLAYERRENDERER_H
18 
19 class QgsFeatureRenderer;
20 class QgsRenderContext;
21 class QgsVectorLayer;
23 
24 class QgsDiagramRenderer;
26 
27 class QgsFeatureIterator;
29 
30 #define SIP_NO_FILE
31 
32 #include <QList>
33 #include <QPainter>
34 
35 typedef QList<int> QgsAttributeList;
36 
37 #include "qgis_sip.h"
38 #include "qgsfields.h" // QgsFields
39 #include "qgsfeatureiterator.h"
41 #include "qgsfeedback.h"
42 #include "qgsfeatureid.h"
43 
44 #include "qgsmaplayerrenderer.h"
45 
48 
55 {
56  Q_OBJECT
57 
58  public:
61 
62  private:
63  const QgsRenderContext &mContext;
64  QTimer *mTimer = nullptr;
65 };
66 
75 {
76  public:
78  ~QgsVectorLayerRenderer() override;
79  QgsFeedback *feedback() const override;
80 
81  bool render() override;
82 
83  private:
84 
90  void prepareLabeling( QgsVectorLayer *layer, QSet<QString> &attributeNames );
91  void prepareDiagrams( QgsVectorLayer *layer, QSet<QString> &attributeNames );
92 
96  void drawRenderer( QgsFeatureIterator &fit );
97 
101  void drawRendererLevels( QgsFeatureIterator &fit );
102 
104  void stopRenderer( QgsSingleSymbolRenderer *selRenderer );
105 
106 
107  protected:
108 
110 
111  std::unique_ptr< QgsVectorLayerRendererInterruptionChecker > mInterruptionChecker;
112 
114  QgsVectorLayer *mLayer = nullptr;
115 
116  QgsFields mFields; // TODO: use fields from mSource
117 
119 
120  QgsVectorLayerFeatureSource *mSource = nullptr;
121 
122  QgsFeatureRenderer *mRenderer = nullptr;
123 
126  int mVertexMarkerStyle = 0;
127  double mVertexMarkerSize = 2.0;
128 
130 
131  QSet<QString> mAttrNames;
132 
134  bool mLabeling;
136  bool mDiagrams;
137 
142  QgsVectorLayerLabelProvider *mLabelProvider = nullptr;
143 
148  QgsVectorLayerDiagramProvider *mDiagramProvider = nullptr;
149 
150  QPainter::CompositionMode mFeatureBlendMode;
151 
154 };
155 
156 
157 #endif // QGSVECTORLAYERRENDERER_H
Wrapper for iterator of features from vector data provider or vector layer.
QSet< QgsFeatureId > QgsFeatureIds
Definition: qgsfeatureid.h:34
Interruption checker used by QgsVectorLayerRenderer::render()
QPainter::CompositionMode mFeatureBlendMode
Container of fields for a vector layer.
Definition: qgsfields.h:42
The QgsVectorLayerLabelProvider class implements a label provider for vector layers.
QgsVectorSimplifyMethod mSimplifyMethod
bool mLabeling
used with old labeling engine (QgsPalLabeling): whether labeling is enabled
Base class for feedback objects to be used for cancellation of something running in a worker thread...
Definition: qgsfeedback.h:44
QgsWkbTypes::GeometryType mGeometryType
QgsVectorLayerRendererInterruptionChecker(const QgsRenderContext &context)
Constructor.
QList< int > QgsAttributeList
Evaluates and returns the diagram settings relating to a diagram for a specific feature.
The QgsVectorLayerDiagramProvider class implements support for diagrams within the labeling engine...
std::unique_ptr< QgsVectorLayerRendererInterruptionChecker > mInterruptionChecker
Partial snapshot of vector layer&#39;s state (only the members necessary for access to features) ...
Implementation of threaded rendering for vector layers.
Stores the settings for rendering of all diagrams for a layer.
GeometryType
The geometry types are used to group QgsWkbTypes::Type in a coarse way.
Definition: qgswkbtypes.h:139
This class contains information how to simplify geometries fetched from a vector layer.
Contains information about the context of a rendering operation.
Base class for utility classes that encapsulate information necessary for rendering of map layers...
Represents a vector layer which manages a vector based data sets.
bool mDiagrams
used with new labeling engine (QgsPalLabeling): whether diagrams are enabled