Generates and renders elevation profile plots. More...

#include <qgsprofilerenderer.h>

Inheritance diagram for QgsProfilePlotRenderer:

Signals
void	generationFinished ()
	Emitted when the profile generation is finished (or canceled). More...

Public Member Functions
	QgsProfilePlotRenderer (const QList< QgsAbstractProfileSource * > &sources, const QgsProfileRequest &request)
	Constructor for QgsProfilePlotRenderer, using the provided list of profile sources to generate the results. More...

	~QgsProfilePlotRenderer () override

void	cancelGeneration ()
	Stop the generation job - does not return until the job has terminated. More...

void	cancelGenerationWithoutBlocking ()
	Triggers cancellation of the generation job without blocking. More...

void	generateSynchronously ()
	Generate the profile results synchronously in this thread. More...

QVector< QgsProfileIdentifyResults >	identify (const QgsDoubleRange &distanceRange, const QgsDoubleRange &elevationRange, const QgsProfileIdentifyContext &context)
	Identify results visible within the specified ranges. More...

QVector< QgsProfileIdentifyResults >	identify (const QgsProfilePoint &point, const QgsProfileIdentifyContext &context)
	Identify results visible at the specified profile point. More...

void	invalidateAllRefinableSources ()
	Invalidates previous results from all refinable sources. More...

bool	invalidateResults (QgsAbstractProfileSource *source)
	Invalidates the profile results from the source with matching ID. More...

bool	isActive () const
	Returns `true` if the generation job is currently running in background. More...

void	regenerateInvalidatedResults ()
	Starts a background regeneration of any invalidated results and immediately returns. More...

void	render (QgsRenderContext &context, double width, double height, double distanceMin, double distanceMax, double zMin, double zMax, const QString &sourceId=QString())
	Renders a portion of the profile using the specified render context. More...

QImage	renderToImage (int width, int height, double distanceMin, double distanceMax, double zMin, double zMax, const QString &sourceId=QString())
	Renders a portion of the profile to an image with the given width and height. More...

void	replaceSource (QgsAbstractProfileSource *source)
	Replaces the existing source with matching ID. More...

void	setContext (const QgsProfileGenerationContext &context)
	Sets the context in which the profile generation will occur. More...

QgsProfileSnapResult	snapPoint (const QgsProfilePoint &point, const QgsProfileSnapContext &context)
	Snap a point to the results. More...

QStringList	sourceIds () const
	Returns the ordered list of source IDs for the sources used by the renderer. More...

void	startGeneration ()
	Start the generation job and immediately return. More...

void	waitForFinished ()
	Block until the current job has finished. More...

QgsDoubleRange	zRange () const
	Returns the limits of the retrieved elevation values. More...

Detailed Description

Generates and renders elevation profile plots.

This class has two roles:

Extraction and generation of the raw elevation profiles from a list of QgsAbstractProfileSource objects.
Rendering the results

Step 1, involving the generation of the elevation profiles only needs to occur once. This is done via a call to startGeneration(), which commences generation of the profiles from each source in a separate background thread. When the generation is completed for all sources the generationFinished() signal is emitted.

After the profile is generated, it can be rendered. The rendering step may be undertaken multiple times (e.g. to render to different image sizes or data ranges) without having to re-generate the raw profile data.

Since: QGIS 3.26

Definition at line 58 of file qgsprofilerenderer.h.

Constructor & Destructor Documentation

◆ QgsProfilePlotRenderer()

QgsProfilePlotRenderer::QgsProfilePlotRenderer	(	const QList< QgsAbstractProfileSource * > &	sources,
		const QgsProfileRequest &	request
	)

Constructor for QgsProfilePlotRenderer, using the provided list of profile sources to generate the results.

Definition at line 27 of file qgsprofilerenderer.cpp.

◆ ~QgsProfilePlotRenderer()

QgsProfilePlotRenderer::~QgsProfilePlotRenderer ( )

override

Definition at line 41 of file qgsprofilerenderer.cpp.

Member Function Documentation

◆ cancelGeneration()

void QgsProfilePlotRenderer::cancelGeneration ( )

Stop the generation job - does not return until the job has terminated.

Does nothing if the generation is not active.

Definition at line 109 of file qgsprofilerenderer.cpp.

◆ cancelGenerationWithoutBlocking()

void QgsProfilePlotRenderer::cancelGenerationWithoutBlocking ( )

Triggers cancellation of the generation job without blocking.

The generation job will continue to operate until it is able to cancel, at which stage the generationFinished() signal will be emitted. Does nothing if the generation is not active.

Definition at line 132 of file qgsprofilerenderer.cpp.

◆ generateSynchronously()

void QgsProfilePlotRenderer::generateSynchronously ( )

Generate the profile results synchronously in this thread.

The function does not return until the generation is complete.

This is an alternative to ordinary API (using startGeneration() + waiting for generationFinished() signal). Users are discouraged to use this method unless they have a strong reason for doing it. The synchronous generation blocks the main thread, making the application unresponsive. Also, it is not possible to cancel generation while it is in progress.

Since: QGIS 3.30

Definition at line 84 of file qgsprofilerenderer.cpp.

◆ generationFinished

void QgsProfilePlotRenderer::generationFinished ( )

signal

Emitted when the profile generation is finished (or canceled).

◆ identify() [1/2]

QVector< QgsProfileIdentifyResults > QgsProfilePlotRenderer::identify	(	const QgsDoubleRange &	distanceRange,
		const QgsDoubleRange &	elevationRange,
		const QgsProfileIdentifyContext &	context
	)

Identify results visible within the specified ranges.

Definition at line 401 of file qgsprofilerenderer.cpp.

◆ identify() [2/2]

QVector< QgsProfileIdentifyResults > QgsProfilePlotRenderer::identify	(	const QgsProfilePoint &	point,
		const QgsProfileIdentifyContext &	context
	)

Identify results visible at the specified profile point.

Definition at line 382 of file qgsprofilerenderer.cpp.

◆ invalidateAllRefinableSources()

void QgsProfilePlotRenderer::invalidateAllRefinableSources ( )

Invalidates previous results from all refinable sources.

Definition at line 194 of file qgsprofilerenderer.cpp.

◆ invalidateResults()

bool QgsProfilePlotRenderer::invalidateResults ( QgsAbstractProfileSource * source )

Invalidates the profile results from the source with matching ID.

The matching stored source will be deleted and replaced with source.

Returns true if results were previously stored for the matching source and have been invalidated.

See also: regenerateInvalidatedResults()

Definition at line 220 of file qgsprofilerenderer.cpp.

◆ isActive()

bool QgsProfilePlotRenderer::isActive ( ) const

Returns true if the generation job is currently running in background.

Definition at line 160 of file qgsprofilerenderer.cpp.

◆ regenerateInvalidatedResults()

void QgsProfilePlotRenderer::regenerateInvalidatedResults ( )

Starts a background regeneration of any invalidated results and immediately returns.

Does nothing if the generation is already in progress.

See also: invalidateResults()

Definition at line 267 of file qgsprofilerenderer.cpp.

◆ render()

void QgsProfilePlotRenderer::render	(	QgsRenderContext &	context,
		double	width,
		double	height,
		double	distanceMin,
		double	distanceMax,
		double	zMin,
		double	zMax,
		const QString &	sourceId = `QString()`
	)

Renders a portion of the profile using the specified render context.

If sourceId is empty then all sources will be rendered, otherwise only the matching source will be rendered.

Definition at line 314 of file qgsprofilerenderer.cpp.

◆ renderToImage()

QImage QgsProfilePlotRenderer::renderToImage	(	int	width,
		int	height,
		double	distanceMin,
		double	distanceMax,
		double	zMin,
		double	zMax,
		const QString &	sourceId = `QString()`
	)

Renders a portion of the profile to an image with the given width and height.

If sourceId is empty then all sources will be rendered, otherwise only the matching source will be rendered.

Definition at line 296 of file qgsprofilerenderer.cpp.

◆ replaceSource()

void QgsProfilePlotRenderer::replaceSource ( QgsAbstractProfileSource * source )

Replaces the existing source with matching ID.

The matching stored source will be deleted and replaced with source.

Definition at line 215 of file qgsprofilerenderer.cpp.

◆ setContext()

void QgsProfilePlotRenderer::setContext ( const QgsProfileGenerationContext & context )

Sets the context in which the profile generation will occur.

Depending on the sources present, this may trigger automatically a regeneration of results.

Definition at line 165 of file qgsprofilerenderer.cpp.

◆ snapPoint()

QgsProfileSnapResult QgsProfilePlotRenderer::snapPoint	(	const QgsProfilePoint &	point,
		const QgsProfileSnapContext &	context
	)

Snap a point to the results.

Definition at line 350 of file qgsprofilerenderer.cpp.

◆ sourceIds()

QStringList QgsProfilePlotRenderer::sourceIds ( ) const

Returns the ordered list of source IDs for the sources used by the renderer.

Definition at line 49 of file qgsprofilerenderer.cpp.

◆ startGeneration()

void QgsProfilePlotRenderer::startGeneration ( )

Start the generation job and immediately return.

Does nothing if the generation is already in progress.

Definition at line 60 of file qgsprofilerenderer.cpp.

◆ waitForFinished()

void QgsProfilePlotRenderer::waitForFinished ( )

Block until the current job has finished.

Definition at line 149 of file qgsprofilerenderer.cpp.

◆ zRange()

QgsDoubleRange QgsProfilePlotRenderer::zRange ( ) const

Returns the limits of the retrieved elevation values.

Definition at line 280 of file qgsprofilerenderer.cpp.

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

/build/qgis-3.30.0+99sid/src/core/elevation/qgsprofilerenderer.h
/build/qgis-3.30.0+99sid/src/core/elevation/qgsprofilerenderer.cpp

Signals

Public Member Functions