Abstract base class for terrain providers. More...

#include <qgsterrainprovider.h>

Inheritance diagram for QgsAbstractTerrainProvider:

[legend]

Public Member Functions
virtual	~QgsAbstractTerrainProvider ()

virtual QgsAbstractTerrainProvider *	clone () const =0
	Creates a clone of the provider and returns the new object.

virtual QgsCoordinateReferenceSystem	crs () const =0
	Returns the native coordinate reference system of the terrain provider.

virtual bool	equals (const QgsAbstractTerrainProvider *other) const =0
	Returns `true` if the provider is equal to other.

virtual double	heightAt (double x, double y) const =0
	Returns the height at the point (x,y) in the terrain provider's native crs().

double	offset () const
	Returns the vertical offset value, used for adjusting the heights from the terrain provider.

QgsAbstractTerrainProvider &	operator= (const QgsAbstractTerrainProvider &other)=delete

virtual void	prepare ()=0
	Called on the main thread prior to accessing the provider from a background thread.

virtual bool	readXml (const QDomElement &element, const QgsReadWriteContext &context)=0
	Reads the terrain provider state from a DOM element.

virtual void	resolveReferences (const QgsProject *project)
	Resolves reference to layers from stored layer ID (if it has not been resolved already)

double	scale () const
	Returns the vertical scale factor, which can be used to exaggerate vertical heights.

void	setOffset (double offset)
	Returns the vertical offset value, used for adjusting the heights from the terrain provider.

void	setScale (double scale)
	Sets the vertical scale factor, which can be used to exaggerate vertical heights.

virtual QString	type () const =0
	Returns the unique type ID string for the provider.

virtual QDomElement	writeXml (QDomDocument &document, const QgsReadWriteContext &context) const =0
	Returns a DOM element representing the state of the terrain provider.

Protected Member Functions
	QgsAbstractTerrainProvider ()=default

	QgsAbstractTerrainProvider (const QgsAbstractTerrainProvider &other)

void	readCommonProperties (const QDomElement &element, const QgsReadWriteContext &context)
	Reads common properties from a DOM element.

void	writeCommonProperties (QDomElement &element, const QgsReadWriteContext &context) const
	Writes common properties to a DOM element.

Protected Attributes
double	mOffset = 0.0
	Offset amount.

double	mScale = 1.0
	Scale factor.

Detailed Description

Abstract base class for terrain providers.

Since: QGIS 3.26

Definition at line 40 of file qgsterrainprovider.h.

Constructor & Destructor Documentation

◆ ~QgsAbstractTerrainProvider()

QgsAbstractTerrainProvider::~QgsAbstractTerrainProvider ( )

virtualdefault

◆ QgsAbstractTerrainProvider() [1/2]

QgsAbstractTerrainProvider::QgsAbstractTerrainProvider ( )

protecteddefault

◆ QgsAbstractTerrainProvider() [2/2]

QgsAbstractTerrainProvider::QgsAbstractTerrainProvider ( const QgsAbstractTerrainProvider & other )

protected

Definition at line 29 of file qgsterrainprovider.cpp.

Member Function Documentation

◆ clone()

virtual QgsAbstractTerrainProvider * QgsAbstractTerrainProvider::clone ( ) const

pure virtual

Creates a clone of the provider and returns the new object.

Ownership is transferred to the caller.

Implemented in QgsFlatTerrainProvider, QgsRasterDemTerrainProvider, and QgsMeshTerrainProvider.

◆ crs()

virtual QgsCoordinateReferenceSystem QgsAbstractTerrainProvider::crs ( ) const

pure virtual

Returns the native coordinate reference system of the terrain provider.

Implemented in QgsFlatTerrainProvider, QgsRasterDemTerrainProvider, and QgsMeshTerrainProvider.

◆ equals()

virtual bool QgsAbstractTerrainProvider::equals ( const QgsAbstractTerrainProvider * other ) const

pure virtual

Returns true if the provider is equal to other.

Implemented in QgsFlatTerrainProvider, QgsRasterDemTerrainProvider, and QgsMeshTerrainProvider.

◆ heightAt()

virtual double QgsAbstractTerrainProvider::heightAt	(	double	x,
		double	y
	)		const

pure virtual

Returns the height at the point (x,y) in the terrain provider's native crs().

Returns NaN if the height could not be obtained at the specified point.

Implemented in QgsFlatTerrainProvider, QgsRasterDemTerrainProvider, and QgsMeshTerrainProvider.

◆ offset()

double QgsAbstractTerrainProvider::offset ( ) const

inline

Returns the vertical offset value, used for adjusting the heights from the terrain provider.

See also: setOffset(); scale()

Definition at line 146 of file qgsterrainprovider.h.

◆ operator=()

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

delete

◆ prepare()

virtual void QgsAbstractTerrainProvider::prepare ( )

pure virtual

Called on the main thread prior to accessing the provider from a background thread.

Subclasses must implement suitable logic in order to prepare for thread-safe calculation of terrain heights on background threads.

Implemented in QgsFlatTerrainProvider, QgsRasterDemTerrainProvider, and QgsMeshTerrainProvider.

◆ readCommonProperties()

void QgsAbstractTerrainProvider::readCommonProperties	(	const QDomElement &	element,
		const QgsReadWriteContext &	context
	)

protected

Reads common properties from a DOM element.

Definition at line 42 of file qgsterrainprovider.cpp.

◆ readXml()

virtual bool QgsAbstractTerrainProvider::readXml	(	const QDomElement &	element,
		const QgsReadWriteContext &	context
	)

pure virtual

Reads the terrain provider state from a DOM element.

See also: writeXml()

Implemented in QgsFlatTerrainProvider, QgsRasterDemTerrainProvider, and QgsMeshTerrainProvider.

◆ resolveReferences()

void QgsAbstractTerrainProvider::resolveReferences ( const QgsProject * project )

virtual

Resolves reference to layers from stored layer ID (if it has not been resolved already)

Reimplemented in QgsRasterDemTerrainProvider, and QgsMeshTerrainProvider.

Definition at line 24 of file qgsterrainprovider.cpp.

◆ scale()

double QgsAbstractTerrainProvider::scale ( ) const

inline

Returns the vertical scale factor, which can be used to exaggerate vertical heights.

See also: setScale(); offset()

Definition at line 130 of file qgsterrainprovider.h.

◆ setOffset()

void QgsAbstractTerrainProvider::setOffset ( double offset )

inline

Returns the vertical offset value, used for adjusting the heights from the terrain provider.

See also: offset(); setScale()

Definition at line 154 of file qgsterrainprovider.h.

◆ setScale()

void QgsAbstractTerrainProvider::setScale ( double scale )

inline

Sets the vertical scale factor, which can be used to exaggerate vertical heights.

See also: scale(); setOffset()

Definition at line 138 of file qgsterrainprovider.h.

◆ type()

virtual QString QgsAbstractTerrainProvider::type ( ) const

pure virtual

Returns the unique type ID string for the provider.

Implemented in QgsFlatTerrainProvider, QgsRasterDemTerrainProvider, and QgsMeshTerrainProvider.

◆ writeCommonProperties()

void QgsAbstractTerrainProvider::writeCommonProperties	(	QDomElement &	element,
		const QgsReadWriteContext &	context
	)		const

protected

Writes common properties to a DOM element.

Definition at line 36 of file qgsterrainprovider.cpp.

◆ writeXml()

virtual QDomElement QgsAbstractTerrainProvider::writeXml	(	QDomDocument &	document,
		const QgsReadWriteContext &	context
	)		const

pure virtual

Returns a DOM element representing the state of the terrain provider.

See also: readXml()

Implemented in QgsFlatTerrainProvider, QgsRasterDemTerrainProvider, and QgsMeshTerrainProvider.

Member Data Documentation

◆ mOffset

double QgsAbstractTerrainProvider::mOffset = 0.0

protected

Offset amount.

Definition at line 178 of file qgsterrainprovider.h.

◆ mScale

double QgsAbstractTerrainProvider::mScale = 1.0

protected

Scale factor.

Definition at line 175 of file qgsterrainprovider.h.

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

/build/qgis-3.40.0+99sid/src/core/elevation/qgsterrainprovider.h
/build/qgis-3.40.0+99sid/src/core/elevation/qgsterrainprovider.cpp

Public Member Functions

Protected Member Functions

Protected Attributes

Detailed Description

Constructor & Destructor Documentation

◆ ~QgsAbstractTerrainProvider()

◆ QgsAbstractTerrainProvider() [1/2]

◆ QgsAbstractTerrainProvider() [2/2]

Member Function Documentation

◆ clone()

◆ crs()

◆ equals()

◆ heightAt()

◆ offset()

◆ operator=()

◆ prepare()

◆ readCommonProperties()

◆ readXml()

◆ resolveReferences()

◆ scale()

◆ setOffset()

◆ setScale()

◆ type()

◆ writeCommonProperties()

◆ writeXml()

Member Data Documentation

◆ mOffset

◆ mScale