QGIS API Documentation 3.40.0-Bratislava (b56115d8743)
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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 if ( sipCpp->diagramName() == QLatin1String( "StackedDiagram" ) )
54 sipType = sipType_QgsStackedDiagram;
55 else
56 sipType = NULL;
58#endif
59
60 virtual ~QgsDiagram() { clearCache(); }
61
65 virtual QgsDiagram *clone() const = 0 SIP_FACTORY;
66
67 void clearCache();
68
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 &interpolationSettings ) = 0;
87
94 virtual double legendSize( double value, const QgsDiagramSettings &s, const QgsDiagramInterpolationSettings &interpolationSettings ) const = 0;
95
96 protected:
97
98 QgsDiagram() = default;
99 QgsDiagram( const QgsDiagram &other );
100
107 void setPenWidth( QPen &pen, const QgsDiagramSettings &s, const QgsRenderContext &c );
108
117 QSizeF sizePainterUnits( QSizeF size, const QgsDiagramSettings &s, const QgsRenderContext &c );
118
127 double sizePainterUnits( double l, const QgsDiagramSettings &s, const QgsRenderContext &c );
128
136 QFont scaledFont( const QgsDiagramSettings &s, const QgsRenderContext &c );
137
144 QSizeF sizeForValue( double value, const QgsDiagramSettings &s, const QgsDiagramInterpolationSettings &interpolationSettings ) const;
145
146 private:
147 QMap<QString, QgsExpression *> mExpressions;
148 QgsDiagram &operator= ( const QgsDiagram & ) = delete;
149};
150
151#endif // QGSDIAGRAM_H
A vector of attributes.
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
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 &interpolationSettings)=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 &interpolationSettings) const =0
Returns the size of the legend item for the diagram corresponding to a specified value.
virtual ~QgsDiagram()
Definition qgsdiagram.h:60
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:58
Container of fields for a vector layer.
Definition qgsfields.h:46
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:191
#define SIP_FACTORY
Definition qgis_sip.h:76
#define SIP_NODEFAULTCTORS
Definition qgis_sip.h:101
#define SIP_END
Definition qgis_sip.h:208