QgsScaleBarRenderer Class Reference

Abstract base class for scale bar renderers. More...

#include <qgsscalebarrenderer.h>

Inheritance diagram for QgsScaleBarRenderer:

Classes
struct	ScaleBarContext
	Contains parameters regarding scalebar calculations. More...

Public Member Functions
	QgsScaleBarRenderer ()=default
	Constructor for QgsScaleBarRenderer. More...
virtual	~QgsScaleBarRenderer ()=default
virtual QSizeF	calculateBoxSize (const QgsScaleBarSettings &settings, const QgsScaleBarRenderer::ScaleBarContext &scaleContext) const
	Calculates the required box size (in millimeters) for a scalebar using the specified settings and scaleContext. More...
virtual void	draw (QgsRenderContext &context, const QgsScaleBarSettings &settings, const QgsScaleBarRenderer::ScaleBarContext &scaleContext) const =0
	Draws the scalebar using the specified settings and scaleContext to a destination render context. More...
virtual QString	name () const =0
	Returns the unique name for this style. More...

Protected Member Functions
void	drawDefaultLabels (QgsRenderContext &context, const QgsScaleBarSettings &settings, const QgsScaleBarRenderer::ScaleBarContext &scaleContext) const
	Draws default scalebar labels using the specified settings and scaleContext to a destination render context. More...
QString	firstLabelString (const QgsScaleBarSettings &settings) const
	Returns the text used for the first label in the scalebar. More...
Q_DECL_DEPRECATED double	firstLabelXOffset (const QgsScaleBarSettings &settings) const
	Returns the x-offset (in millimeters) used for the first label in the scalebar. More...
double	firstLabelXOffset (const QgsScaleBarSettings &settings, const QgsRenderContext &context) const
	Returns the x-offset (in render context painter units) used for the first label in the scalebar. More...
QList< double >	segmentPositions (const QgsScaleBarRenderer::ScaleBarContext &scaleContext, const QgsScaleBarSettings &settings) const
	Returns a list of positions for each segment within the scalebar. More...
QList< double >	segmentWidths (const QgsScaleBarRenderer::ScaleBarContext &scaleContext, const QgsScaleBarSettings &settings) const
	Returns a list of widths of each segment of the scalebar. More...

Detailed Description

Abstract base class for scale bar renderers.

Scalebar renderer subclasses implement custom drawing logic, with the possibility to implement custom labeling.

Since

QGIS 3.0

Definition at line 38 of file qgsscalebarrenderer.h.

Constructor & Destructor Documentation

QgsScaleBarRenderer()

QgsScaleBarRenderer::QgsScaleBarRenderer ( )

default

Constructor for QgsScaleBarRenderer.

~QgsScaleBarRenderer()

virtual QgsScaleBarRenderer::~QgsScaleBarRenderer ( )

virtualdefault

Member Function Documentation

calculateBoxSize()

QSizeF QgsScaleBarRenderer::calculateBoxSize ( const QgsScaleBarSettings &  settings, const QgsScaleBarRenderer::ScaleBarContext &  scaleContext  ) const

virtual

Calculates the required box size (in millimeters) for a scalebar using the specified settings and scaleContext.

Reimplemented in QgsNumericScaleBarRenderer.

Definition at line 98 of file qgsscalebarrenderer.cpp.

draw()

virtual void QgsScaleBarRenderer::draw ( QgsRenderContext &  context, const QgsScaleBarSettings &  settings, const QgsScaleBarRenderer::ScaleBarContext &  scaleContext  ) const

pure virtual

Draws the scalebar using the specified settings and scaleContext to a destination render context.

Implemented in QgsTicksScaleBarRenderer, QgsSingleBoxScaleBarRenderer, QgsDoubleBoxScaleBarRenderer, and QgsNumericScaleBarRenderer.

drawDefaultLabels()

void QgsScaleBarRenderer::drawDefaultLabels ( QgsRenderContext &  context, const QgsScaleBarSettings &  settings, const QgsScaleBarRenderer::ScaleBarContext &  scaleContext  ) const

protected

Draws default scalebar labels using the specified settings and scaleContext to a destination render context.

Definition at line 24 of file qgsscalebarrenderer.cpp.

firstLabelString()

QString QgsScaleBarRenderer::firstLabelString ( const QgsScaleBarSettings &  settings ) const

protected

Returns the text used for the first label in the scalebar.

Definition at line 121 of file qgsscalebarrenderer.cpp.

firstLabelXOffset() [1/2]

double QgsScaleBarRenderer::firstLabelXOffset ( const QgsScaleBarSettings &  settings ) const

protected

Returns the x-offset (in millimeters) used for the first label in the scalebar.

Deprecated:

Use the version with QgsRenderContext instead.

Definition at line 133 of file qgsscalebarrenderer.cpp.

firstLabelXOffset() [2/2]

double QgsScaleBarRenderer::firstLabelXOffset ( const QgsScaleBarSettings &  settings, const QgsRenderContext &  context  ) const

protected

Returns the x-offset (in render context painter units) used for the first label in the scalebar.

Since

QGIS 3.2

Definition at line 141 of file qgsscalebarrenderer.cpp.

name()

virtual QString QgsScaleBarRenderer::name ( ) const

pure virtual

Returns the unique name for this style.

Implemented in QgsTicksScaleBarRenderer, QgsSingleBoxScaleBarRenderer, QgsDoubleBoxScaleBarRenderer, and QgsNumericScaleBarRenderer.

segmentPositions()

QList< double > QgsScaleBarRenderer::segmentPositions ( const QgsScaleBarRenderer::ScaleBarContext &  scaleContext, const QgsScaleBarSettings &  settings  ) const

protected

Returns a list of positions for each segment within the scalebar.

Definition at line 147 of file qgsscalebarrenderer.cpp.

segmentWidths()

QList< double > QgsScaleBarRenderer::segmentWidths ( const QgsScaleBarRenderer::ScaleBarContext &  scaleContext, const QgsScaleBarSettings &  settings  ) const

protected

Returns a list of widths of each segment of the scalebar.

Definition at line 171 of file qgsscalebarrenderer.cpp.

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The documentation for this class was generated from the following files:

• /tmp/buildd/qgis-3.2.0+99unstable/src/core/scalebar/qgsscalebarrenderer.h
• /tmp/buildd/qgis-3.2.0+99unstable/src/core/scalebar/qgsscalebarrenderer.cpp