QGIS API Documentation  2.15.0-Master (af20121)
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 "qgsfeature.h"
19 #include "qgsexpressioncontext.h"
20 #include <QPen>
21 #include <QBrush>
22 
23 class QPainter;
24 class QPointF;
25 class QgsDiagramSettings;
27 
28 class QgsRenderContext;
29 
30 class QgsExpression;
31 
32 
33 
35 class CORE_EXPORT QgsDiagram
36 {
37  public:
38  virtual ~QgsDiagram() { clearCache(); }
41  virtual QgsDiagram* clone() const = 0;
42 
43  void clearCache();
44 
46  Q_DECL_DEPRECATED QgsExpression* getExpression( const QString& expression, const QgsFields* fields );
47 
53  QgsExpression* getExpression( const QString& expression, const QgsExpressionContext& context );
54 
56  virtual Q_DECL_DEPRECATED void renderDiagram( const QgsAttributes& att, QgsRenderContext& c, const QgsDiagramSettings& s, QPointF position );
58  virtual void renderDiagram( const QgsFeature& feature, QgsRenderContext& c, const QgsDiagramSettings& s, QPointF position ) = 0;
59  virtual QString diagramName() const = 0;
61  virtual QSizeF diagramSize( const QgsAttributes& attributes, const QgsRenderContext& c, const QgsDiagramSettings& s ) = 0;
63  virtual Q_DECL_DEPRECATED QSizeF diagramSize( const QgsAttributes& attributes, const QgsRenderContext& c, const QgsDiagramSettings& s, const QgsDiagramInterpolationSettings& is );
65  virtual QSizeF diagramSize( const QgsFeature& feature, const QgsRenderContext& c, const QgsDiagramSettings& s, const QgsDiagramInterpolationSettings& is ) = 0;
66 
73  virtual double legendSize( double value, const QgsDiagramSettings& s, const QgsDiagramInterpolationSettings& is ) const = 0;
74 
75  protected:
76  QgsDiagram();
77  QgsDiagram( const QgsDiagram& other );
78 
84  void setPenWidth( QPen& pen, const QgsDiagramSettings& s, const QgsRenderContext& c );
85 
93  QSizeF sizePainterUnits( QSizeF size, const QgsDiagramSettings& s, const QgsRenderContext& c );
94 
102  float sizePainterUnits( float l, const QgsDiagramSettings& s, const QgsRenderContext& c );
103 
110  QFont scaledFont( const QgsDiagramSettings& s, const QgsRenderContext& c );
111 
118  QSizeF sizeForValue( double value, const QgsDiagramSettings& s, const QgsDiagramInterpolationSettings& is ) const;
119 
120  private:
121  QMap<QString, QgsExpression*> mExpressions;
122 };
123 
124 #endif // QGSDIAGRAM_H
Class for parsing and evaluation of expressions (formerly called "search strings").
virtual ~QgsDiagram()
Definition: qgsdiagram.h:38
Container of fields for a vector layer.
Definition: qgsfield.h:193
The feature class encapsulates a single feature including its id, geometry and a list of field/values...
Definition: qgsfeature.h:187
Expression contexts are used to encapsulate the parameters around which a QgsExpression should be eva...
Base class for all diagram types.
Definition: qgsdiagram.h:35
Contains information about the context of a rendering operation.
A vector of attributes.
Definition: qgsfeature.h:115
Stores the settings for rendering a single diagram.