QGIS API Documentation  2.99.0-Master (e077efd)
qgshistogramdiagram.h
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1 /***************************************************************************
2  qgshistogramdiagram.h
3  ---------------------
4  begin : August 2012
5  copyright : (C) 2012 by Matthias Kuhn
6  email : matthias at opengis 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 
16 #ifndef QGSHISTOGRAMDIAGRAM_H
17 #define QGSHISTOGRAMDIAGRAM_H
18 
19 #define DIAGRAM_NAME_HISTOGRAM "Histogram"
20 
21 #include "qgsdiagram.h"
22 #include <QPen>
23 #include <QBrush>
24 
25 class QgsFeature;
26 class QPainter;
27 class QPointF;
28 class QgsDiagramSettings;
30 
31 class QgsRenderContext;
32 
36 class CORE_EXPORT QgsHistogramDiagram: public QgsDiagram
37 {
38  public:
41 
42  virtual QgsHistogramDiagram* clone() const override;
43 
44  void renderDiagram( const QgsFeature& feature, QgsRenderContext& c, const QgsDiagramSettings& s, QPointF position ) override;
45 
46  QSizeF diagramSize( const QgsAttributes& attributes, const QgsRenderContext& c, const QgsDiagramSettings& s ) override;
47  QSizeF diagramSize( const QgsFeature& feature, const QgsRenderContext& c, const QgsDiagramSettings& s, const QgsDiagramInterpolationSettings& is ) override;
48  double legendSize( double value, const QgsDiagramSettings& s, const QgsDiagramInterpolationSettings& is ) const override;
49  QString diagramName() const override { return DIAGRAM_NAME_HISTOGRAM; }
50 
51  private:
52  QBrush mCategoryBrush;
53  QPen mPen;
54  double mScaleFactor;
55 };
56 
57 
58 #endif // QGSHISTOGRAMDIAGRAM_H
#define DIAGRAM_NAME_HISTOGRAM
The feature class encapsulates a single feature including its id, geometry and a list of field/values...
Definition: qgsfeature.h:135
QString diagramName() const override
Get a descriptive name for this diagram type.
virtual double legendSize(double value, const QgsDiagramSettings &s, const QgsDiagramInterpolationSettings &is) const =0
Returns the size of the legend item for the diagram corresponding to a specified value.
virtual void renderDiagram(const QgsFeature &feature, QgsRenderContext &c, const QgsDiagramSettings &s, QPointF position)=0
Draws the diagram at the given position (in pixel coordinates)
virtual QSizeF diagramSize(const QgsAttributes &attributes, const QgsRenderContext &c, const QgsDiagramSettings &s)=0
Returns the size in map units the diagram will use to render.
Base class for all diagram types.
Definition: qgsdiagram.h:35
virtual QgsDiagram * clone() const =0
Returns an instance that is equivalent to this one.
Additional diagram settings for interpolated size rendering.
Contains information about the context of a rendering operation.
A vector of attributes.
Definition: qgsfeature.h:55
Stores the settings for rendering a single diagram.