QGIS API Documentation 3.39.0-Master (93ce9bf5c90)
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Base class for all diagram types. More...
#include <qgsdiagram.h>
Public Member Functions | |
virtual | ~QgsDiagram () |
void | clearCache () |
virtual QgsDiagram * | clone () const =0 |
Returns an instance that is equivalent to this one. | |
virtual QString | diagramName () const =0 |
Gets a descriptive name for this diagram type. | |
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. | |
QgsExpression * | getExpression (const QString &expression, const QgsExpressionContext &context) |
Returns a prepared expression for the specified context. | |
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 void | renderDiagram (const QgsFeature &feature, QgsRenderContext &c, const QgsDiagramSettings &s, QPointF position)=0 |
Draws the diagram at the given position (in pixel coordinates) | |
Protected Member Functions | |
QgsDiagram ()=default | |
QgsDiagram (const QgsDiagram &other) | |
QFont | scaledFont (const QgsDiagramSettings &s, const QgsRenderContext &c) |
Calculates a size to match the current settings and rendering context. | |
void | setPenWidth (QPen &pen, const QgsDiagramSettings &s, const QgsRenderContext &c) |
Changes the pen width to match the current settings and rendering context. | |
QSizeF | sizeForValue (double value, const QgsDiagramSettings &s, const QgsDiagramInterpolationSettings &interpolationSettings) const |
Returns the scaled size of a diagram for a value, respecting the specified diagram interpolation settings. | |
double | sizePainterUnits (double l, const QgsDiagramSettings &s, const QgsRenderContext &c) |
Calculates a length to match the current settings and rendering context. | |
QSizeF | sizePainterUnits (QSizeF size, const QgsDiagramSettings &s, const QgsRenderContext &c) |
Calculates a size to match the current settings and rendering context. | |
Base class for all diagram types.
Definition at line 39 of file qgsdiagram.h.
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inlinevirtual |
Definition at line 60 of file qgsdiagram.h.
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protecteddefault |
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protected |
Definition at line 21 of file qgsdiagram.cpp.
void QgsDiagram::clearCache | ( | ) |
Definition at line 27 of file qgsdiagram.cpp.
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pure virtual |
Returns an instance that is equivalent to this one.
Implemented in QgsHistogramDiagram, QgsPieDiagram, QgsStackedBarDiagram, QgsStackedDiagram, and QgsTextDiagram.
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pure virtual |
Gets a descriptive name for this diagram type.
Implemented in QgsHistogramDiagram, QgsPieDiagram, QgsStackedBarDiagram, QgsStackedDiagram, and QgsTextDiagram.
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pure virtual |
Returns the size in map units the diagram will use to render.
Implemented in QgsHistogramDiagram, QgsPieDiagram, QgsStackedBarDiagram, QgsStackedDiagram, and QgsTextDiagram.
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pure virtual |
Returns the size in map units the diagram will use to render. Interpolate size.
Implemented in QgsHistogramDiagram, QgsPieDiagram, QgsStackedBarDiagram, QgsTextDiagram, and QgsStackedDiagram.
QgsExpression * QgsDiagram::getExpression | ( | const QString & | expression, |
const QgsExpressionContext & | context | ||
) |
Returns a prepared expression for the specified context.
expression | expression string |
context | expression context |
Definition at line 38 of file qgsdiagram.cpp.
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pure virtual |
Returns the size of the legend item for the diagram corresponding to a specified value.
value | value to return legend item size for |
s | diagram settings |
interpolationSettings | interpolation settings |
Implemented in QgsHistogramDiagram, QgsPieDiagram, QgsStackedBarDiagram, QgsTextDiagram, and QgsStackedDiagram.
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pure virtual |
Draws the diagram at the given position (in pixel coordinates)
Implemented in QgsHistogramDiagram, QgsPieDiagram, QgsStackedBarDiagram, QgsStackedDiagram, and QgsTextDiagram.
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protected |
Calculates a size to match the current settings and rendering context.
s | The settings that contain the font size and size type |
c | The rendering specifying the proper scale units for pixel conversion |
Definition at line 65 of file qgsdiagram.cpp.
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protected |
Changes the pen width to match the current settings and rendering context.
pen | The pen to modify |
s | The settings that specify the pen width |
c | The rendering specifying the proper scale units for pixel conversion |
Definition at line 49 of file qgsdiagram.cpp.
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protected |
Returns the scaled size of a diagram for a value, respecting the specified diagram interpolation settings.
value | value to calculate corresponding circular size for |
s | diagram settings |
interpolationSettings | interpolation settings |
Definition at line 81 of file qgsdiagram.cpp.
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protected |
Calculates a length to match the current settings and rendering context.
l | The length to convert |
s | The settings that specify the size type |
c | The rendering specifying the proper scale units for pixel conversion |
Definition at line 60 of file qgsdiagram.cpp.
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protected |
Calculates a size to match the current settings and rendering context.
size | The size to convert |
s | The settings that specify the size type |
c | The rendering specifying the proper scale units for pixel conversion |
Definition at line 55 of file qgsdiagram.cpp.