QGIS API Documentation  2.11.0-Master
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 
45  Q_DECL_DEPRECATED QgsExpression* getExpression( const QString& expression, const QgsFields* fields );
46 
52  QgsExpression* getExpression( const QString& expression, const QgsExpressionContext& context );
53 
55  virtual Q_DECL_DEPRECATED void renderDiagram( const QgsAttributes& att, QgsRenderContext& c, const QgsDiagramSettings& s, const QPointF& position );
57  virtual void renderDiagram( const QgsFeature& feature, QgsRenderContext& c, const QgsDiagramSettings& s, const QPointF& position ) = 0;
58  virtual QString diagramName() const = 0;
60  virtual QSizeF diagramSize( const QgsAttributes& attributes, const QgsRenderContext& c, const QgsDiagramSettings& s ) = 0;
62  virtual Q_DECL_DEPRECATED QSizeF diagramSize( const QgsAttributes& attributes, const QgsRenderContext& c, const QgsDiagramSettings& s, const QgsDiagramInterpolationSettings& is );
64  virtual QSizeF diagramSize( const QgsFeature& feature, const QgsRenderContext& c, const QgsDiagramSettings& s, const QgsDiagramInterpolationSettings& is ) = 0;
65 
66  protected:
67  QgsDiagram();
68  QgsDiagram( const QgsDiagram& other );
69 
75  void setPenWidth( QPen& pen, const QgsDiagramSettings& s, const QgsRenderContext& c );
76 
84  QSizeF sizePainterUnits( const QSizeF& size, const QgsDiagramSettings& s, const QgsRenderContext& c );
85 
93  float sizePainterUnits( float l, const QgsDiagramSettings& s, const QgsRenderContext& c );
94 
101  QFont scaledFont( const QgsDiagramSettings& s, const QgsRenderContext& c );
102 
103  private:
104  QMap<QString, QgsExpression*> mExpressions;
105 };
106 
107 #endif // QGSDIAGRAM_H
Class for parsing and evaluation of expressions (formerly called "search strings").
Definition: qgsexpression.h:88
virtual ~QgsDiagram()
Definition: qgsdiagram.h:38
Container of fields for a vector layer.
Definition: qgsfield.h:177
The feature class encapsulates a single feature including its id, geometry and a list of field/values...
Definition: qgsfeature.h:162
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:109