QGIS API Documentation 3.30.0-'s-Hertogenbosch (f186b8efe0)
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
24class QPainter;
25class QPointF;
28class QgsFeature;
31class QgsFields;
32class QgsAttributes;
33
34
40{
41 public:
42
43#ifdef SIP_RUN
45 if ( sipCpp->diagramName() == QLatin1String( "Pie" ) )
46 sipType = sipType_QgsPieDiagram;
47 else if ( sipCpp->diagramName() == QLatin1String( "Histogram" ) )
48 sipType = sipType_QgsHistogramDiagram;
49 else if ( sipCpp->diagramName() == QLatin1String( "Text" ) )
50 sipType = sipType_QgsTextDiagram;
51 else if ( sipCpp->diagramName() == QLatin1String( "Stacked" ) )
52 sipType = sipType_QgsStackedBarDiagram;
53 else
54 sipType = NULL;
56#endif
57
58 virtual ~QgsDiagram() { clearCache(); }
59
64 virtual QgsDiagram *clone() const = 0 SIP_FACTORY;
65
66 void clearCache();
67
74 QgsExpression *getExpression( const QString &expression, const QgsExpressionContext &context );
75
77 virtual void renderDiagram( const QgsFeature &feature, QgsRenderContext &c, const QgsDiagramSettings &s, QPointF position ) = 0;
78
82 virtual QString diagramName() const = 0;
84 virtual QSizeF diagramSize( const QgsAttributes &attributes, const QgsRenderContext &c, const QgsDiagramSettings &s ) = 0;
86 virtual QSizeF diagramSize( const QgsFeature &feature, const QgsRenderContext &c, const QgsDiagramSettings &s, const QgsDiagramInterpolationSettings &is ) = 0;
87
95 virtual double legendSize( double value, const QgsDiagramSettings &s, const QgsDiagramInterpolationSettings &is ) const = 0;
96
97 protected:
98
102 QgsDiagram() = default;
103 QgsDiagram( const QgsDiagram &other );
104
111 void setPenWidth( QPen &pen, const QgsDiagramSettings &s, const QgsRenderContext &c );
112
121 QSizeF sizePainterUnits( QSizeF size, const QgsDiagramSettings &s, const QgsRenderContext &c );
122
131 double sizePainterUnits( double l, const QgsDiagramSettings &s, const QgsRenderContext &c );
132
140 QFont scaledFont( const QgsDiagramSettings &s, const QgsRenderContext &c );
141
149 QSizeF sizeForValue( double value, const QgsDiagramSettings &s, const QgsDiagramInterpolationSettings &is ) const;
150
151 private:
152 QMap<QString, QgsExpression *> mExpressions;
153 QgsDiagram &operator= ( const QgsDiagram & ) = delete;
154};
155
156#endif // QGSDIAGRAM_H
A vector of attributes.
Definition: qgsattributes.h:59
Additional diagram settings for interpolated size rendering.
Stores the settings for rendering a single diagram.
Base class for all diagram types.
Definition: qgsdiagram.h:40
virtual QString diagramName() const =0
Gets a descriptive name for this diagram type.
QgsDiagram()=default
Constructor for QgsDiagram.
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.
virtual QSizeF diagramSize(const QgsFeature &feature, const QgsRenderContext &c, const QgsDiagramSettings &s, const QgsDiagramInterpolationSettings &is)=0
Returns the size in map units the diagram will use to render. Interpolate size.
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 ~QgsDiagram()
Definition: qgsdiagram.h:58
virtual QgsDiagram * clone() const =0
Returns an instance that is equivalent to this one.
virtual void renderDiagram(const QgsFeature &feature, QgsRenderContext &c, const QgsDiagramSettings &s, QPointF position)=0
Draws the diagram at the given position (in pixel coordinates)
Expression contexts are used to encapsulate the parameters around which a QgsExpression should be eva...
Class for parsing and evaluation of expressions (formerly called "search strings").
The feature class encapsulates a single feature including its unique ID, geometry and a list of field...
Definition: qgsfeature.h:56
Container of fields for a vector layer.
Definition: qgsfields.h:45
Contains information about the context of a rendering operation.
As part of the API refactoring and improvements which landed in the Processing API was substantially reworked from the x version This was done in order to allow much of the underlying Processing framework to be ported into c
#define SIP_CONVERT_TO_SUBCLASS_CODE(code)
Definition: qgis_sip.h:186
#define SIP_FACTORY
Definition: qgis_sip.h:76
#define SIP_NODEFAULTCTORS
Definition: qgis_sip.h:101
#define SIP_END
Definition: qgis_sip.h:203