QGIS API Documentation  2.99.0-Master (19b062c)
qgsdiagram.h
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1 /***************************************************************************
2  qgsdiagram.h
3  ---------------------
4  begin : March 2011
5  copyright : (C) 2011 by Marco Hugentobler
6  email : marco dot hugentobler 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 #ifndef QGSDIAGRAM_H
16 #define QGSDIAGRAM_H
17 
18 #include "qgis_core.h"
19 #include "qgis.h"
20 #include <QPen>
21 #include <QBrush>
22 #include "qgsexpression.h" //for QMap with QgsExpression
23 
24 class QPainter;
25 class QPointF;
26 class QgsDiagramSettings;
28 class QgsFeature;
29 class QgsRenderContext;
31 class QgsFields;
32 class QgsAttributes;
33 
34 
38 class CORE_EXPORT QgsDiagram
39 {
40  public:
41 
42  virtual ~QgsDiagram() { clearCache(); }
43 
47  virtual QgsDiagram *clone() const = 0 SIP_FACTORY;
48 
49  void clearCache();
50 
57  QgsExpression *getExpression( const QString &expression, const QgsExpressionContext &context );
58 
60  virtual void renderDiagram( const QgsFeature &feature, QgsRenderContext &c, const QgsDiagramSettings &s, QPointF position ) = 0;
61 
65  virtual QString diagramName() const = 0;
67  virtual QSizeF diagramSize( const QgsAttributes &attributes, const QgsRenderContext &c, const QgsDiagramSettings &s ) = 0;
69  virtual QSizeF diagramSize( const QgsFeature &feature, const QgsRenderContext &c, const QgsDiagramSettings &s, const QgsDiagramInterpolationSettings &is ) = 0;
70 
78  virtual double legendSize( double value, const QgsDiagramSettings &s, const QgsDiagramInterpolationSettings &is ) const = 0;
79 
80  protected:
81 
85  QgsDiagram() = default;
86  QgsDiagram( const QgsDiagram &other );
87 
94  void setPenWidth( QPen &pen, const QgsDiagramSettings &s, const QgsRenderContext &c );
95 
104  QSizeF sizePainterUnits( QSizeF size, const QgsDiagramSettings &s, const QgsRenderContext &c );
105 
114  double sizePainterUnits( double l, const QgsDiagramSettings &s, const QgsRenderContext &c );
115 
123  QFont scaledFont( const QgsDiagramSettings &s, const QgsRenderContext &c );
124 
132  QSizeF sizeForValue( double value, const QgsDiagramSettings &s, const QgsDiagramInterpolationSettings &is ) const;
133 
134  private:
135  QMap<QString, QgsExpression *> mExpressions;
136 };
137 
138 #endif // QGSDIAGRAM_H
virtual ~QgsDiagram()
Definition: qgsdiagram.h:42
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:62
Expression contexts are used to encapsulate the parameters around which a QgsExpression should be eva...
#define SIP_FACTORY
Definition: qgis_sip.h:69
Base class for all diagram types.
Definition: qgsdiagram.h:38
Additional diagram settings for interpolated size rendering.
Contains information about the context of a rendering operation.
A vector of attributes.
Definition: qgsattributes.h:58
Stores the settings for rendering a single diagram.