Abstract base class for 2d point cloud renderers. More...

#include <qgspointcloudrenderer.h>

Inheritance diagram for QgsPointCloudRenderer:

[legend]

Public Types
enum	PointSymbol { Square , Circle }
	Rendering symbols for points. More...

Public Member Functions
	QgsPointCloudRenderer ()=default
	Constructor for QgsPointCloudRenderer. More...

	QgsPointCloudRenderer (const QgsPointCloudRenderer &other)=delete
	QgsPointCloudRenderer cannot be copied – use clone() instead. More...

virtual	~QgsPointCloudRenderer ()=default

virtual void	checkLegendItem (const QString &key, bool state=true)
	Called when the check state of the legend item with the specified key is changed. More...

virtual QgsPointCloudRenderer *	clone () const =0
	Create a deep copy of this renderer. More...

virtual QList< QgsLayerTreeModelLegendNode * >	createLegendNodes (QgsLayerTreeLayer *nodeLayer)
	Creates a set of legend nodes representing the renderer. More...

QVector< QVariantMap >	identify (QgsPointCloudLayer *layer, const QgsRenderContext &context, const QgsGeometry &geometry, double toleranceForPointIdentification=0)
	Returns the list of visible points of the point cloud layer layer and an extent defined by a geometry in the 2D plane geometry. More...

virtual bool	legendItemChecked (const QString &key)
	Returns `true` if the legend item with the specified key is checked. More...

virtual QStringList	legendRuleKeys () const
	Returns a list of all rule keys for legend nodes created by the renderer. More...

double	maximumScreenError () const
	Returns the maximum screen error allowed when rendering the point cloud. More...

QgsUnitTypes::RenderUnit	maximumScreenErrorUnit () const
	Returns the unit for the maximum screen error allowed when rendering the point cloud. More...

QgsPointCloudRenderer &	operator= (const QgsPointCloudRenderer &other)=delete
	QgsPointCloudRenderer cannot be copied – use clone() instead. More...

double	pointSize () const
	Returns the point size. More...

const QgsMapUnitScale &	pointSizeMapUnitScale () const
	Returns the map unit scale used for the point size. More...

QgsUnitTypes::RenderUnit	pointSizeUnit () const
	Returns the units used for the point size. More...

PointSymbol	pointSymbol () const
	Returns the symbol used by the renderer for drawing points. More...

virtual void	renderBlock (const QgsPointCloudBlock *block, QgsPointCloudRenderContext &context)=0
	Renders a block of point cloud data using the specified render context. More...

virtual QDomElement	save (QDomDocument &doc, const QgsReadWriteContext &context) const =0
	Saves the renderer configuration to an XML element. More...

void	setMaximumScreenError (double error)
	Sets the maximum screen error allowed when rendering the point cloud. More...

void	setMaximumScreenErrorUnit (QgsUnitTypes::RenderUnit unit)
	Sets the unit for the maximum screen error allowed when rendering the point cloud. More...

void	setPointSize (double size)
	Sets the point size. More...

void	setPointSizeMapUnitScale (const QgsMapUnitScale &scale)
	Sets the map unit scale used for the point size. More...

void	setPointSizeUnit (const QgsUnitTypes::RenderUnit units)
	Sets the units used for the point size. More...

void	setPointSymbol (PointSymbol symbol)
	Sets the symbol used by the renderer for drawing points. More...

virtual void	startRender (QgsPointCloudRenderContext &context)
	Must be called when a new render cycle is started. More...

virtual void	stopRender (QgsPointCloudRenderContext &context)
	Must be called when a render cycle has finished, to allow the renderer to clean up. More...

virtual QString	type () const =0
	Returns the identifier of the renderer type. More...

virtual QSet< QString >	usedAttributes (const QgsPointCloudRenderContext &context) const
	Returns a list of attributes required by this renderer. More...

virtual bool	willRenderPoint (const QMap< QString, QVariant > &pointAttributes)
	Checks whether the point holding pointAttributes attributes will be rendered By default if not overridden in the subclass renderer will return true ( the renderer is responsible for the filtering behavior ) More...

Static Public Member Functions
static QgsPointCloudRenderer *	load (QDomElement &element, const QgsReadWriteContext &context)
	Creates a renderer from an XML element. More...

Protected Member Functions
void	copyCommonProperties (QgsPointCloudRenderer *destination) const
	Copies common point cloud properties (such as point size and screen error) to the destination renderer. More...

void	drawPoint (double x, double y, const QColor &color, QgsPointCloudRenderContext &context) const
	Draws a point using a color at the specified x and y (in map coordinates). More...

void	restoreCommonProperties (const QDomElement &element, const QgsReadWriteContext &context)
	Restores common renderer properties (such as point size and screen error) from the specified DOM element. More...

void	saveCommonProperties (QDomElement &element, const QgsReadWriteContext &context) const
	Saves common renderer properties (such as point size and screen error) to the specified DOM element. More...

Static Protected Member Functions
static void	pointXY (QgsPointCloudRenderContext &context, const char *ptr, int i, double &x, double &y)
	Retrieves the x and y coordinate for the point at index i. More...

static double	pointZ (QgsPointCloudRenderContext &context, const char *ptr, int i)
	Retrieves the z value for the point at index i. More...

Detailed Description

Abstract base class for 2d point cloud renderers.

Since: QGIS 3.18

Definition at line 222 of file qgspointcloudrenderer.h.

Member Enumeration Documentation

◆ PointSymbol

enum QgsPointCloudRenderer::PointSymbol

Rendering symbols for points.

Enumerator
Square	Renders points as squares.
Circle	Renders points as circles.

Definition at line 248 of file qgspointcloudrenderer.h.

Constructor & Destructor Documentation

◆ QgsPointCloudRenderer() [1/2]

QgsPointCloudRenderer::QgsPointCloudRenderer ( )

default

Constructor for QgsPointCloudRenderer.

◆ ~QgsPointCloudRenderer()

virtual QgsPointCloudRenderer::~QgsPointCloudRenderer ( )

virtualdefault

◆ QgsPointCloudRenderer() [2/2]

QgsPointCloudRenderer::QgsPointCloudRenderer ( const QgsPointCloudRenderer & other )

delete

QgsPointCloudRenderer cannot be copied – use clone() instead.

Member Function Documentation

◆ checkLegendItem()

void QgsPointCloudRenderer::checkLegendItem	(	const QString &	key,
		bool	state = `true`
	)

virtual

Called when the check state of the legend item with the specified key is changed.

See also: legendItemChecked()

Reimplemented in QgsPointCloudClassifiedRenderer.

Definition at line 121 of file qgspointcloudrenderer.cpp.

◆ clone()

virtual QgsPointCloudRenderer* QgsPointCloudRenderer::clone ( ) const

pure virtual

Create a deep copy of this renderer.

Should be implemented by all subclasses and generate a proper subclass.

Implemented in QgsPointCloudRgbRenderer, QgsPointCloudExtentRenderer, QgsPointCloudClassifiedRenderer, and QgsPointCloudAttributeByRampRenderer.

◆ copyCommonProperties()

void QgsPointCloudRenderer::copyCommonProperties ( QgsPointCloudRenderer * destination ) const

protected

Copies common point cloud properties (such as point size and screen error) to the destination renderer.

Definition at line 156 of file qgspointcloudrenderer.cpp.

◆ createLegendNodes()

QList< QgsLayerTreeModelLegendNode * > QgsPointCloudRenderer::createLegendNodes ( QgsLayerTreeLayer * nodeLayer )

virtual

Creates a set of legend nodes representing the renderer.

Reimplemented in QgsPointCloudExtentRenderer, QgsPointCloudClassifiedRenderer, and QgsPointCloudAttributeByRampRenderer.

Definition at line 146 of file qgspointcloudrenderer.cpp.

◆ drawPoint()

void QgsPointCloudRenderer::drawPoint	(	double	x,
		double	y,
		const QColor &	color,
		QgsPointCloudRenderContext &	context
	)		const

inlineprotected

Draws a point using a color at the specified x and y (in map coordinates).

Definition at line 511 of file qgspointcloudrenderer.h.

◆ identify()

QVector< QVariantMap > QgsPointCloudRenderer::identify	(	QgsPointCloudLayer *	layer,
		const QgsRenderContext &	context,
		const QgsGeometry &	geometry,
		double	toleranceForPointIdentification = `0`
	)

Returns the list of visible points of the point cloud layer layer and an extent defined by a geometry in the 2D plane geometry.

The toleranceForPointIdentification argument can be used to specify a minimum tolerance allowable when identify from a point geometry value. This must be specified in the map units associated with the render context.

Warning: The geometry value must be specified in the render context's destination CRS, not the layer's native CRS!

Definition at line 198 of file qgspointcloudrenderer.cpp.

◆ legendItemChecked()

bool QgsPointCloudRenderer::legendItemChecked ( const QString & key )

virtual

Returns true if the legend item with the specified key is checked.

See also: checkLegendItem()

Reimplemented in QgsPointCloudClassifiedRenderer.

Definition at line 116 of file qgspointcloudrenderer.cpp.

◆ legendRuleKeys()

QStringList QgsPointCloudRenderer::legendRuleKeys ( ) const

virtual

Returns a list of all rule keys for legend nodes created by the renderer.

Reimplemented in QgsPointCloudClassifiedRenderer.

Definition at line 151 of file qgspointcloudrenderer.cpp.

◆ load()

QgsPointCloudRenderer * QgsPointCloudRenderer::load	(	QDomElement &	element,
		const QgsReadWriteContext &	context
	)

static

Creates a renderer from an XML element.

Caller takes ownership of the returned renderer.

See also: save()

Definition at line 61 of file qgspointcloudrenderer.cpp.

◆ maximumScreenError()

double QgsPointCloudRenderer::maximumScreenError ( ) const

Returns the maximum screen error allowed when rendering the point cloud.

Larger values result in a faster render with less points rendered.

Units are retrieved via maximumScreenErrorUnit().

See also: setMaximumScreenError(); maximumScreenErrorUnit()

Definition at line 126 of file qgspointcloudrenderer.cpp.

◆ maximumScreenErrorUnit()

QgsUnitTypes::RenderUnit QgsPointCloudRenderer::maximumScreenErrorUnit ( ) const

Returns the unit for the maximum screen error allowed when rendering the point cloud.

See also: maximumScreenError(); setMaximumScreenErrorUnit()

Definition at line 136 of file qgspointcloudrenderer.cpp.

◆ operator=()

QgsPointCloudRenderer& QgsPointCloudRenderer::operator= ( const QgsPointCloudRenderer & other )

delete

QgsPointCloudRenderer cannot be copied – use clone() instead.

◆ pointSize()

double QgsPointCloudRenderer::pointSize ( ) const

inline

Returns the point size.

The point size units are retrieved by calling pointSizeUnit().

See also: setPointSize(); pointSizeUnit(); pointSizeMapUnitScale()

Definition at line 383 of file qgspointcloudrenderer.h.

◆ pointSizeMapUnitScale()

const QgsMapUnitScale& QgsPointCloudRenderer::pointSizeMapUnitScale ( ) const

inline

Returns the map unit scale used for the point size.

See also: setPointSizeMapUnitScale(); pointSizeUnit(); pointSize()

Definition at line 416 of file qgspointcloudrenderer.h.

◆ pointSizeUnit()

QgsUnitTypes::RenderUnit QgsPointCloudRenderer::pointSizeUnit ( ) const

inline

Returns the units used for the point size.

See also: setPointSizeUnit(); pointSize(); pointSizeMapUnitScale()

Definition at line 400 of file qgspointcloudrenderer.h.

◆ pointSymbol()

QgsPointCloudRenderer::PointSymbol QgsPointCloudRenderer::pointSymbol ( ) const

Returns the symbol used by the renderer for drawing points.

See also: setPointSymbol()

Definition at line 188 of file qgspointcloudrenderer.cpp.

◆ pointXY()

static void QgsPointCloudRenderer::pointXY	(	QgsPointCloudRenderContext &	context,
		const char *	ptr,
		int	i,
		double &	x,
		double &	y
	)

inlinestaticprotected

Retrieves the x and y coordinate for the point at index i.

Definition at line 487 of file qgspointcloudrenderer.h.

◆ pointZ()

static double QgsPointCloudRenderer::pointZ	(	QgsPointCloudRenderContext &	context,
		const char *	ptr,
		int	i
	)

inlinestaticprotected

Retrieves the z value for the point at index i.

Definition at line 500 of file qgspointcloudrenderer.h.

◆ renderBlock()

virtual void QgsPointCloudRenderer::renderBlock	(	const QgsPointCloudBlock *	block,
		QgsPointCloudRenderContext &	context
	)

pure virtual

Renders a block of point cloud data using the specified render context.

Implemented in QgsPointCloudRgbRenderer, QgsPointCloudExtentRenderer, QgsPointCloudClassifiedRenderer, and QgsPointCloudAttributeByRampRenderer.

◆ restoreCommonProperties()

void QgsPointCloudRenderer::restoreCommonProperties	(	const QDomElement &	element,
		const QgsReadWriteContext &	context
	)

protected

Restores common renderer properties (such as point size and screen error) from the specified DOM element.

See also: saveCommonProperties()

Definition at line 166 of file qgspointcloudrenderer.cpp.

◆ save()

virtual QDomElement QgsPointCloudRenderer::save	(	QDomDocument &	doc,
		const QgsReadWriteContext &	context
	)		const

pure virtual

Saves the renderer configuration to an XML element.

See also: load()

Implemented in QgsPointCloudRgbRenderer, QgsPointCloudExtentRenderer, QgsPointCloudClassifiedRenderer, and QgsPointCloudAttributeByRampRenderer.

◆ saveCommonProperties()

void QgsPointCloudRenderer::saveCommonProperties	(	QDomElement &	element,
		const QgsReadWriteContext &	context
	)		const

protected

Saves common renderer properties (such as point size and screen error) to the specified DOM element.

See also: restoreCommonProperties()

Definition at line 177 of file qgspointcloudrenderer.cpp.

◆ setMaximumScreenError()

void QgsPointCloudRenderer::setMaximumScreenError ( double error )

Sets the maximum screen error allowed when rendering the point cloud.

Larger values result in a faster render with less points rendered.

Units are set via setMaximumScreenErrorUnit().

See also: maximumScreenError(); setMaximumScreenErrorUnit()

Definition at line 131 of file qgspointcloudrenderer.cpp.

◆ setMaximumScreenErrorUnit()

void QgsPointCloudRenderer::setMaximumScreenErrorUnit ( QgsUnitTypes::RenderUnit unit )

Sets the unit for the maximum screen error allowed when rendering the point cloud.

See also: setMaximumScreenError(); maximumScreenErrorUnit()

Definition at line 141 of file qgspointcloudrenderer.cpp.

◆ setPointSize()

void QgsPointCloudRenderer::setPointSize ( double size )

inline

Sets the point size.

Point size units are specified via setPointSizeUnit().

See also: pointSize(); setPointSizeUnit(); setPointSizeMapUnitScale()

Definition at line 372 of file qgspointcloudrenderer.h.

◆ setPointSizeMapUnitScale()

void QgsPointCloudRenderer::setPointSizeMapUnitScale ( const QgsMapUnitScale & scale )

inline

Sets the map unit scale used for the point size.

See also: pointSizeMapUnitScale(); setPointSize(); setPointSizeUnit()

Definition at line 408 of file qgspointcloudrenderer.h.

◆ setPointSizeUnit()

void QgsPointCloudRenderer::setPointSizeUnit ( const QgsUnitTypes::RenderUnit units )

inline

Sets the units used for the point size.

See also: setPointSize(); pointSizeUnit(); setPointSizeMapUnitScale()

Definition at line 392 of file qgspointcloudrenderer.h.

◆ setPointSymbol()

void QgsPointCloudRenderer::setPointSymbol ( PointSymbol symbol )

Sets the symbol used by the renderer for drawing points.

See also: pointSymbol()

Definition at line 193 of file qgspointcloudrenderer.cpp.

◆ startRender()

void QgsPointCloudRenderer::startRender ( QgsPointCloudRenderContext & context )

virtual

Must be called when a new render cycle is started.

A call to startRender() must always be followed by a corresponding call to stopRender() after all features have been rendered.

See also: stopRender()

Warning: This method is not thread safe. Before calling startRender() in a non-main thread, the renderer should instead be cloned and startRender()/stopRender() called on the clone.

Reimplemented in QgsPointCloudExtentRenderer.

Definition at line 82 of file qgspointcloudrenderer.cpp.

◆ stopRender()

void QgsPointCloudRenderer::stopRender ( QgsPointCloudRenderContext & context )

virtual

Must be called when a render cycle has finished, to allow the renderer to clean up.

Calls to stopRender() must always be preceded by a call to startRender().

Warning: This method is not thread safe. Before calling startRender() in a non-main thread, the renderer should instead be cloned and startRender()/stopRender() called on the clone.

See also: startRender()

Reimplemented in QgsPointCloudExtentRenderer.

Definition at line 109 of file qgspointcloudrenderer.cpp.

◆ type()

virtual QString QgsPointCloudRenderer::type ( ) const

pure virtual

Returns the identifier of the renderer type.

Implemented in QgsPointCloudRgbRenderer, QgsPointCloudExtentRenderer, QgsPointCloudClassifiedRenderer, and QgsPointCloudAttributeByRampRenderer.

◆ usedAttributes()

QSet< QString > QgsPointCloudRenderer::usedAttributes ( const QgsPointCloudRenderContext & context ) const

virtual

Returns a list of attributes required by this renderer.

Attributes not listed in here may not be requested from the provider at rendering time.

Note: the "X" and "Y" attributes will always be fetched and do not need to be explicitly returned here.

Reimplemented in QgsPointCloudRgbRenderer, QgsPointCloudClassifiedRenderer, and QgsPointCloudAttributeByRampRenderer.

Definition at line 77 of file qgspointcloudrenderer.cpp.

◆ willRenderPoint()

virtual bool QgsPointCloudRenderer::willRenderPoint ( const QMap< QString, QVariant > & pointAttributes )

inlinevirtual

Checks whether the point holding pointAttributes attributes will be rendered By default if not overridden in the subclass renderer will return true ( the renderer is responsible for the filtering behavior )

Definition at line 299 of file qgspointcloudrenderer.h.

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

/build/qgis-3.18.1+99unstable/src/core/pointcloud/qgspointcloudrenderer.h
/build/qgis-3.18.1+99unstable/src/core/pointcloud/qgspointcloudrenderer.cpp

Public Types

Public Member Functions

Static Public Member Functions

Protected Member Functions

Static Protected Member Functions

Detailed Description

Member Enumeration Documentation

◆ PointSymbol

Constructor & Destructor Documentation

◆ QgsPointCloudRenderer() [1/2]

◆ ~QgsPointCloudRenderer()

◆ QgsPointCloudRenderer() [2/2]

Member Function Documentation

◆ checkLegendItem()

◆ clone()

◆ copyCommonProperties()

◆ createLegendNodes()

◆ drawPoint()

◆ identify()

◆ legendItemChecked()

◆ legendRuleKeys()

◆ load()

◆ maximumScreenError()

◆ maximumScreenErrorUnit()

◆ operator=()

◆ pointSize()

◆ pointSizeMapUnitScale()

◆ pointSizeUnit()

◆ pointSymbol()

◆ pointXY()

◆ pointZ()

◆ renderBlock()

◆ restoreCommonProperties()

◆ save()

◆ saveCommonProperties()

◆ setMaximumScreenError()

◆ setMaximumScreenErrorUnit()

◆ setPointSize()

◆ setPointSizeMapUnitScale()

◆ setPointSizeUnit()

◆ setPointSymbol()

◆ startRender()

◆ stopRender()

◆ type()

◆ usedAttributes()

◆ willRenderPoint()