QgsDiagram Class Reference

Base class for all diagram types. More...

#include <qgsdiagram.h>

Inheritance diagram for QgsDiagram:

List of all members.

Public Member Functions
virtual	~QgsDiagram ()
virtual QString	diagramName () const =0
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 QgsAttributes &attributes, const QgsRenderContext &c, const QgsDiagramSettings &s, const QgsDiagramInterpolationSettings &is)=0
	Returns the size in map units the diagram will use to render.
virtual void	renderDiagram (const QgsAttributes &att, QgsRenderContext &c, const QgsDiagramSettings &s, const QPointF &position)=0
	Draws the diagram at the given position (in pixel coordinates)
Protected Member Functions
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	sizePainterUnits (const QSizeF &size, const QgsDiagramSettings &s, const QgsRenderContext &c)
	Calculates a size to match the current settings and rendering context.
float	sizePainterUnits (float l, const QgsDiagramSettings &s, const QgsRenderContext &c)
	Calculates a length to match the current settings and rendering context.

---

Detailed Description

Base class for all diagram types.

Definition at line 32 of file qgsdiagram.h.

---

Constructor & Destructor Documentation

virtual QgsDiagram::~QgsDiagram

(

)

[inline, virtual]

Definition at line 35 of file qgsdiagram.h.

---

Member Function Documentation

virtual QString QgsDiagram::diagramName

(

)

const [pure virtual]

Implemented in QgsTextDiagram, QgsHistogramDiagram, and QgsPieDiagram.

Referenced by QgsDiagramRendererV2::_writeXML().

virtual QSizeF QgsDiagram::diagramSize	(	const QgsAttributes &	attributes,
		const QgsRenderContext &	c,
		const QgsDiagramSettings &	s
	)		[pure virtual]

Returns the size in map units the diagram will use to render.

Implemented in QgsTextDiagram, QgsHistogramDiagram, and QgsPieDiagram.

Referenced by QgsSingleCategoryDiagramRenderer::diagramSize(), and QgsLinearlyInterpolatedDiagramRenderer::diagramSize().

virtual QSizeF QgsDiagram::diagramSize	(	const QgsAttributes &	attributes,
		const QgsRenderContext &	c,
		const QgsDiagramSettings &	s,
		const QgsDiagramInterpolationSettings &	is
	)		[pure virtual]

Returns the size in map units the diagram will use to render.

Interpolate size

Implemented in QgsTextDiagram, QgsHistogramDiagram, and QgsPieDiagram.

virtual void QgsDiagram::renderDiagram	(	const QgsAttributes &	att,
		QgsRenderContext &	c,
		const QgsDiagramSettings &	s,
		const QPointF &	position
	)		[pure virtual]

Draws the diagram at the given position (in pixel coordinates)

Implemented in QgsTextDiagram, QgsHistogramDiagram, and QgsPieDiagram.

Referenced by QgsDiagramRendererV2::renderDiagram().

QFont QgsDiagram::scaledFont	(	const QgsDiagramSettings &	s,
		const QgsRenderContext &	c
	)		[protected]

Calculates a size to match the current settings and rendering context.

Parameters:

s	The settings that contain the font size and size type
c	The rendering specifying the proper scale units for pixel conversion

Returns:

The properly scaled font for rendering

Definition at line 58 of file qgsdiagram.cpp.

References QgsDiagramSettings::font, QgsRenderContext::mapToPixel(), QgsMapToPixel::mapUnitsPerPixel(), QgsDiagramSettings::MM, QgsRenderContext::scaleFactor(), and QgsDiagramSettings::sizeType.

Referenced by QgsTextDiagram::renderDiagram().

void QgsDiagram::setPenWidth	(	QPen &	pen,
		const QgsDiagramSettings &	s,
		const QgsRenderContext &	c
	)		[protected]

Changes the pen width to match the current settings and rendering context.

Parameters:

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 21 of file qgsdiagram.cpp.

References QgsRenderContext::mapToPixel(), QgsMapToPixel::mapUnitsPerPixel(), QgsDiagramSettings::MM, QgsDiagramSettings::penWidth, QgsRenderContext::scaleFactor(), and QgsDiagramSettings::sizeType.

Referenced by QgsPieDiagram::renderDiagram(), QgsHistogramDiagram::renderDiagram(), and QgsTextDiagram::renderDiagram().

QSizeF QgsDiagram::sizePainterUnits	(	const QSizeF &	size,
		const QgsDiagramSettings &	s,
		const QgsRenderContext &	c
	)		[protected]

Calculates a size to match the current settings and rendering context.

Parameters:

size	The size to convert
s	The settings that specify the size type
c	The rendering specifying the proper scale units for pixel conversion

Returns:

The converted size for rendering

Definition at line 34 of file qgsdiagram.cpp.

References QgsRenderContext::mapToPixel(), QgsMapToPixel::mapUnitsPerPixel(), QgsDiagramSettings::MM, QgsRenderContext::scaleFactor(), and QgsDiagramSettings::sizeType.

Referenced by QgsPieDiagram::renderDiagram(), QgsHistogramDiagram::renderDiagram(), and QgsTextDiagram::renderDiagram().

float QgsDiagram::sizePainterUnits	(	float	l,
		const QgsDiagramSettings &	s,
		const QgsRenderContext &	c
	)		[protected]

Calculates a length to match the current settings and rendering context.

Parameters:

l	The length to convert
s	Unused
c	The rendering specifying the proper scale units for pixel conversion

Returns:

The converted length for rendering

Definition at line 46 of file qgsdiagram.cpp.

References QgsRenderContext::mapToPixel(), QgsMapToPixel::mapUnitsPerPixel(), QgsDiagramSettings::MM, QgsRenderContext::scaleFactor(), and QgsDiagramSettings::sizeType.

---

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

• src/core/diagram/qgsdiagram.h
• src/core/diagram/qgsdiagram.cpp