The QgsMapSettings class contains configuration for rendering of the map. More...

#include <qgsmapsettings.h>

Inheritance diagram for QgsMapSettings:

Public Types
enum	Flag { Antialiasing = 0x01, DrawEditingInfo = 0x02, ForceVectorOutput = 0x04, UseAdvancedEffects = 0x08, DrawLabeling = 0x10, UseRenderingOptimization = 0x20, DrawSelection = 0x40, DrawSymbolBounds = 0x80, RenderMapTile = 0x100, RenderPartialOutput = 0x200, RenderPreviewJob = 0x400, RenderBlocking = 0x800, LosslessImageRendering = 0x1000, Render3DMap = 0x2000 }
	Enumeration of flags that adjust the way the map is rendered. More...

Public Member Functions
	QgsMapSettings ()

void	addClippingRegion (const QgsMapClippingRegion &region)
	Adds a new clipping region to the map settings. More...

void	addRenderedFeatureHandler (QgsRenderedFeatureHandlerInterface *handler)
	Adds a rendered feature handler to use while rendering the map settings. More...

QColor	backgroundColor () const
	Gets the background color of the map. More...

void	clearCustomRenderingFlag (const QString &flag)
	Clears the specified custom rendering flag. More...

QList< QgsMapClippingRegion >	clippingRegions () const
	Returns the list of clipping regions to apply to the map. More...

Q_DECL_DEPRECATED QString	customRenderFlags () const
	Gets custom rendering flags. More...

QVariantMap	customRenderingFlags () const
	Gets custom rendering flags. More...

QgsCoordinateReferenceSystem	destinationCrs () const
	returns CRS of destination coordinate reference system More...

QSize	deviceOutputSize () const
	Returns the device output size of the map canvas This is equivalent to the output size multiplicated by the device pixel ratio. More...

float	devicePixelRatio () const
	Returns device pixel ratio Common values are 1 for normal-dpi displays and 2 for high-dpi "retina" displays. More...

QString	ellipsoid () const
	Returns ellipsoid's acronym. More...

const QgsExpressionContext &	expressionContext () const
	Gets the expression context. More...

QgsRectangle	extent () const
	Returns geographical coordinates of the rectangle that should be rendered. More...

double	extentBuffer () const
	Returns the buffer in map units to use around the visible extent for rendering symbols whose corresponding geometries are outside the visible extent. More...

Flags	flags () const
	Returns combination of flags used for rendering. More...

QgsRectangle	fullExtent () const
	returns current extent of layer set More...

bool	hasValidSettings () const
	Check whether the map settings are valid and can be used for rendering. More...

QList< QgsLabelBlockingRegion >	labelBlockingRegions () const
	Returns the list of regions to avoid placing labels within. More...

QgsGeometry	labelBoundaryGeometry () const
	Returns the label boundary geometry, which restricts where in the rendered map labels are permitted to be placed. More...

const QgsLabelingEngineSettings &	labelingEngineSettings () const
	Returns the global configuration of the labeling engine. More...

QgsRectangle	layerExtentToOutputExtent (const QgsMapLayer *layer, QgsRectangle extent) const
	transform bounding box from layer's CRS to output CRS More...

QStringList	layerIds () const
	Gets list of layer IDs for map rendering The layers are stored in the reverse order of how they are rendered (layer with index 0 will be on top) More...

QList< QgsMapLayer * >	layers () const
	Gets list of layers for map rendering The layers are stored in the reverse order of how they are rendered (layer with index 0 will be on top) More...

QMap< QString, QString >	layerStyleOverrides () const
	Gets map of map layer style overrides (key: layer ID, value: style name) where a different style should be used instead of the current one. More...

QgsPoint	layerToMapCoordinates (const QgsMapLayer *layer, const QgsPoint &point) const
	transform point coordinates from layer's CRS to output CRS More...

QgsPointXY	layerToMapCoordinates (const QgsMapLayer *layer, QgsPointXY point) const
	transform point coordinates from layer's CRS to output CRS More...

QgsRectangle	layerToMapCoordinates (const QgsMapLayer *layer, QgsRectangle rect) const
	transform rectangle from layer's CRS to output CRS More...

double	layerToMapUnits (const QgsMapLayer *layer, const QgsRectangle &referenceExtent=QgsRectangle()) const
	Computes an estimated conversion factor between layer and map units: layerUnits * layerToMapUnits = mapUnits. More...

QgsCoordinateTransform	layerTransform (const QgsMapLayer *layer) const
	Returns the coordinate transform from layer's CRS to destination CRS. More...

double	magnificationFactor () const
	Returns the magnification factor. More...

QgsPoint	mapToLayerCoordinates (const QgsMapLayer *layer, const QgsPoint &point) const
	transform point coordinates from output CRS to layer's CRS More...

QgsPointXY	mapToLayerCoordinates (const QgsMapLayer *layer, QgsPointXY point) const
	transform point coordinates from output CRS to layer's CRS More...

QgsRectangle	mapToLayerCoordinates (const QgsMapLayer *layer, QgsRectangle rect) const
	transform rectangle from output CRS to layer's CRS More...

const QgsMapToPixel &	mapToPixel () const

QgsUnitTypes::DistanceUnit	mapUnits () const
	Gets units of map's geographical coordinates - used for scale calculation. More...

double	mapUnitsPerPixel () const
	Returns the distance in geographical coordinates that equals to one pixel in the map. More...

double	outputDpi () const
	Returns DPI used for conversion between real world units (e.g. More...

QgsRectangle	outputExtentToLayerExtent (const QgsMapLayer *layer, QgsRectangle extent) const
	transform bounding box from output CRS to layer's CRS More...

QImage::Format	outputImageFormat () const
	format of internal QImage, default QImage::Format_ARGB32_Premultiplied More...

QSize	outputSize () const
	Returns the size of the resulting map image. More...

const QgsPathResolver &	pathResolver () const
	Returns the path resolver for conversion between relative and absolute paths during rendering operations, e.g. More...

void	readXml (QDomNode &node)

QList< QgsRenderedFeatureHandlerInterface * >	renderedFeatureHandlers () const
	Returns the list of rendered feature handlers to use while rendering the map settings. More...

double	rotation () const
	Returns the rotation of the resulting map image, in degrees clockwise. More...

double	scale () const
	Returns the calculated map scale. More...

double	segmentationTolerance () const
	Gets the segmentation tolerance applied when rendering curved geometries. More...

QgsAbstractGeometry::SegmentationToleranceType	segmentationToleranceType () const
	Gets segmentation tolerance type (maximum angle or maximum difference between curve and approximation) More...

QColor	selectionColor () const
	Gets color that is used for drawing of selected vector features. More...

void	setBackgroundColor (const QColor &color)
	Sets the background color of the map. More...

void	setClippingRegions (const QList< QgsMapClippingRegion > &regions)
	Sets the list of clipping regions to apply to the map. More...

Q_DECL_DEPRECATED void	setCustomRenderFlags (const QString &customRenderFlags)
	Sets the custom rendering flags. More...

void	setCustomRenderingFlag (const QString &flag, const QVariant &value)
	Sets a custom rendering flag. More...

void	setDestinationCrs (const QgsCoordinateReferenceSystem &crs)
	sets destination coordinate reference system More...

void	setDevicePixelRatio (float dpr)
	Sets the device pixel ratio Common values are 1 for normal-dpi displays and 2 for high-dpi "retina" displays. More...

bool	setEllipsoid (const QString &ellipsoid)
	Sets the ellipsoid by its acronym. More...

void	setExpressionContext (const QgsExpressionContext &context)
	Sets the expression context. More...

void	setExtent (const QgsRectangle &rect, bool magnified=true)
	Set coordinates of the rectangle which should be rendered. More...

void	setExtentBuffer (double buffer)
	Sets the buffer in map units to use around the visible extent for rendering symbols whose corresponding geometries are outside the visible extent. More...

void	setFlag (Flag flag, bool on=true)
	Enable or disable a particular flag (other flags are not affected) More...

void	setFlags (QgsMapSettings::Flags flags)
	Sets combination of flags that will be used for rendering. More...

void	setLabelBlockingRegions (const QList< QgsLabelBlockingRegion > &regions)
	Sets a list of regions to avoid placing labels within. More...

void	setLabelBoundaryGeometry (const QgsGeometry &boundary)
	Sets the label boundary geometry, which restricts where in the rendered map labels are permitted to be placed. More...

void	setLabelingEngineSettings (const QgsLabelingEngineSettings &settings)
	Sets the global configuration of the labeling engine. More...

void	setLayers (const QList< QgsMapLayer * > &layers)
	Set list of layers for map rendering. More...

void	setLayerStyleOverrides (const QMap< QString, QString > &overrides)
	Set map of map layer style overrides (key: layer ID, value: style name) where a different style should be used instead of the current one. More...

void	setMagnificationFactor (double factor, const QgsPointXY *center=nullptr)
	Set the magnification factor. More...

void	setOutputDpi (double dpi)
	Sets DPI used for conversion between real world units (e.g. mm) and pixels. More...

void	setOutputImageFormat (QImage::Format format)
	sets format of internal QImage More...

void	setOutputSize (QSize size)
	Sets the size of the resulting map image. More...

void	setPathResolver (const QgsPathResolver &resolver)
	Sets the path resolver for conversion between relative and absolute paths during rendering operations, e.g. More...

void	setRotation (double rotation)
	Sets the rotation of the resulting map image, in degrees clockwise. More...

void	setSegmentationTolerance (double tolerance)
	Sets the segmentation tolerance applied when rendering curved geometries. More...

void	setSegmentationToleranceType (QgsAbstractGeometry::SegmentationToleranceType type)
	Sets segmentation tolerance type (maximum angle or maximum difference between curve and approximation) More...

void	setSelectionColor (const QColor &color)
	Sets color that is used for drawing of selected vector features. More...

void	setSimplifyMethod (const QgsVectorSimplifyMethod &method)
	Sets the simplification setting to use when rendering vector layers. More...

void	setTextRenderFormat (QgsRenderContext::TextRenderFormat format)
	Sets the text render format, which dictates how text is rendered (e.g. More...

void	setTransformContext (const QgsCoordinateTransformContext &context)
	Sets the coordinate transform context, which stores various information regarding which datum transforms should be used when transforming points from a source to destination coordinate reference system. More...

const QgsVectorSimplifyMethod &	simplifyMethod () const
	Returns the simplification settings to use when rendering vector layers. More...

bool	testFlag (Flag flag) const
	Check whether a particular flag is enabled. More...

QgsRenderContext::TextRenderFormat	textRenderFormat () const
	Returns the text render format, which dictates how text is rendered (e.g. More...

QgsCoordinateTransformContext	transformContext () const
	Returns the coordinate transform context, which stores various information regarding which datum transforms should be used when transforming points from a source to destination coordinate reference system. More...

QgsRectangle	visibleExtent () const
	Returns the actual extent derived from requested extent that takes takes output image size into account. More...

QPolygonF	visiblePolygon () const
	Returns the visible area as a polygon (may be rotated) More...

void	writeXml (QDomNode &node, QDomDocument &doc)

Public Member Functions inherited from QgsTemporalRangeObject
	QgsTemporalRangeObject (bool enabled=false)
	Constructor QgsTemporalRangeObject. More...

virtual	~QgsTemporalRangeObject ()=default

bool	isTemporal () const
	Returns `true` if the object's temporal range is enabled, and the object will be filtered when rendering maps with a specific time range set. More...

void	setIsTemporal (bool enabled)
	Sets whether the temporal range is enabled (i.e. More...

void	setTemporalRange (const QgsDateTimeRange &range)
	Sets the temporal range for the object. More...

const QgsDateTimeRange &	temporalRange () const
	Returns the datetime range for the object. More...

Protected Member Functions
void	updateDerived ()

Protected Attributes
QColor	mBackgroundColor

QString	mCustomRenderFlags

QVariantMap	mCustomRenderingFlags

QgsCoordinateReferenceSystem	mDestCRS

float	mDevicePixelRatio = 1.0

double	mDpi

QString	mEllipsoid
	ellipsoid acronym (from table tbl_ellipsoids) More...

QgsExpressionContext	mExpressionContext

QgsRectangle	mExtent

double	mExtentBuffer = 0.0

Flags	mFlags

QImage::Format	mImageFormat = QImage::Format_ARGB32_Premultiplied

QgsGeometry	mLabelBoundaryGeometry

QgsLabelingEngineSettings	mLabelingEngineSettings

QgsWeakMapLayerPointerList	mLayers
	list of layers to be rendered (stored as weak pointers) More...

QMap< QString, QString >	mLayerStyleOverrides

double	mMagnificationFactor = 1.0

QgsMapToPixel	mMapToPixel

double	mMapUnitsPerPixel = 1

QgsPathResolver	mPathResolver

double	mRotation = 0.0

double	mScale = 1

QgsScaleCalculator	mScaleCalculator

double	mSegmentationTolerance

QgsAbstractGeometry::SegmentationToleranceType	mSegmentationToleranceType = QgsAbstractGeometry::MaximumAngle

QColor	mSelectionColor

QgsVectorSimplifyMethod	mSimplifyMethod

QSize	mSize

QgsRenderContext::TextRenderFormat	mTextRenderFormat = QgsRenderContext::TextFormatAlwaysOutlines

QgsCoordinateTransformContext	mTransformContext

bool	mValid = false
	Whether the actual settings are valid (set in updateDerived()) More...

QgsRectangle	mVisibleExtent
	Extent with some additional white space that matches the output aspect ratio. More...

Detailed Description

The QgsMapSettings class contains configuration for rendering of the map.

The rendering itself is done by QgsMapRendererJob subclasses.

In order to set up QgsMapSettings instance, it is necessary to set at least few members: extent, output size and layers.

Some systems use high DPI scaling that is an alternative to the traditional DPI scaling. The operating system provides Qt with a scaling ratio and it scales window, event, and desktop geometry. The Cocoa platform plugin sets the scaling ratio as QWindow::devicePixelRatio(). To properly render the map on such systems, the map settings device pixel ratio shall be set accordingly.

Since: QGIS 2.4

Definition at line 87 of file qgsmapsettings.h.

Member Enumeration Documentation

◆ Flag

enum QgsMapSettings::Flag

Enumeration of flags that adjust the way the map is rendered.

Enumerator
Antialiasing	Enable anti-aliasing for map rendering.
DrawEditingInfo	Enable drawing of vertex markers for layers in editing mode.
ForceVectorOutput	Vector graphics should not be cached and drawn as raster images.
UseAdvancedEffects	Enable layer opacity and blending effects.
DrawLabeling	Enable drawing of labels on top of the map.
UseRenderingOptimization	Enable vector simplification and other rendering optimizations.
DrawSelection	Whether vector selections should be shown in the rendered map.
DrawSymbolBounds	Draw bounds of symbols (for debugging/testing)
RenderMapTile	Draw map such that there are no problems between adjacent tiles.
RenderPartialOutput	Whether to make extra effort to update map image with partially rendered layers (better for interactive map canvas). Added in QGIS 3.0.
RenderPreviewJob	Render is a 'canvas preview' render, and shortcuts should be taken to ensure fast rendering.
RenderBlocking	Render and load remote sources in the same thread to ensure rendering remote sources (svg and images). WARNING: this flag must NEVER be used from GUI based applications (like the main QGIS application) or crashes will result. Only for use in external scripts or QGIS server.
LosslessImageRendering	Render images losslessly whenever possible, instead of the default lossy jpeg rendering used for some destination devices (e.g. PDF). This flag only works with builds based on Qt 5.13 or later.
Render3DMap	Render is for a 3D map.

Definition at line 301 of file qgsmapsettings.h.

Constructor & Destructor Documentation

◆ QgsMapSettings()

QgsMapSettings::QgsMapSettings ( )

Definition at line 34 of file qgsmapsettings.cpp.

Member Function Documentation

◆ addClippingRegion()

void QgsMapSettings::addClippingRegion ( const QgsMapClippingRegion & region )

Adds a new clipping region to the map settings.

See also: clippingRegions(); setClippingRegions()

Since: QGIS 3.16

Definition at line 726 of file qgsmapsettings.cpp.

◆ addRenderedFeatureHandler()

void QgsMapSettings::addRenderedFeatureHandler ( QgsRenderedFeatureHandlerInterface * handler )

Adds a rendered feature handler to use while rendering the map settings.

Ownership of handler is NOT transferred, and it is the caller's responsibility to ensure that the handler exists for the lifetime of the map render job.

See also: renderedFeatureHandlers()

Since: QGIS 3.10

Definition at line 741 of file qgsmapsettings.cpp.

◆ backgroundColor()

QColor QgsMapSettings::backgroundColor ( ) const

inline

Gets the background color of the map.

Definition at line 293 of file qgsmapsettings.h.

◆ clearCustomRenderingFlag()

void QgsMapSettings::clearCustomRenderingFlag ( const QString & flag )

inline

Clears the specified custom rendering flag.

Parameters

flag	the flag name

See also: setCustomRenderingFlag()

Since: QGIS 3.12

Definition at line 262 of file qgsmapsettings.h.

◆ clippingRegions()

QList< QgsMapClippingRegion > QgsMapSettings::clippingRegions ( ) const

Returns the list of clipping regions to apply to the map.

See also: addClippingRegion(); setClippingRegions()

Since: QGIS 3.16

Definition at line 736 of file qgsmapsettings.cpp.

◆ customRenderFlags()

Q_DECL_DEPRECATED QString QgsMapSettings::customRenderFlags ( ) const

inline

Gets custom rendering flags.

Layers might honour these to alter their rendering.

Returns: custom flags strings, separated by ';'

See also: setCustomRenderFlags()

Since: QGIS 2.16

Deprecated:: use

See also: customRenderingFlags().

Definition at line 228 of file qgsmapsettings.h.

◆ customRenderingFlags()

QVariantMap QgsMapSettings::customRenderingFlags ( ) const

inline

Gets custom rendering flags.

Layers might honour these to alter their rendering.

Returns: a map of custom flags

See also: setCustomRenderingFlag()

Since: QGIS 3.12

Definition at line 245 of file qgsmapsettings.h.

◆ destinationCrs()

QgsCoordinateReferenceSystem QgsMapSettings::destinationCrs ( ) const

returns CRS of destination coordinate reference system

Definition at line 318 of file qgsmapsettings.cpp.

◆ deviceOutputSize()

QSize QgsMapSettings::deviceOutputSize ( ) const

Returns the device output size of the map canvas This is equivalent to the output size multiplicated by the device pixel ratio.

Since: QGIS 3.4

Definition at line 258 of file qgsmapsettings.cpp.

◆ devicePixelRatio()

float QgsMapSettings::devicePixelRatio ( ) const

Returns device pixel ratio Common values are 1 for normal-dpi displays and 2 for high-dpi "retina" displays.

Since: QGIS 3.4

Definition at line 247 of file qgsmapsettings.cpp.

◆ ellipsoid()

QString QgsMapSettings::ellipsoid ( ) const

inline

Returns ellipsoid's acronym.

Calculations will only use the ellipsoid if a valid ellipsoid has been set.

See also: setEllipsoid()

Since: QGIS 3.0

Definition at line 288 of file qgsmapsettings.h.

◆ expressionContext()

const QgsExpressionContext& QgsMapSettings::expressionContext ( ) const

inline

Gets the expression context.

This context should be used for all expression evaluation associated with this map settings.

See also: setExpressionContext()

Since: QGIS 2.12

Definition at line 396 of file qgsmapsettings.h.

◆ extent()

QgsRectangle QgsMapSettings::extent ( ) const

Returns geographical coordinates of the rectangle that should be rendered.

The actual visible extent used for rendering could be slightly different since the given extent may be expanded in order to fit the aspect ratio of output size. Use visibleExtent() to get the resulting extent.

Definition at line 74 of file qgsmapsettings.cpp.

◆ extentBuffer()

double QgsMapSettings::extentBuffer ( ) const

Returns the buffer in map units to use around the visible extent for rendering symbols whose corresponding geometries are outside the visible extent.

See also: setExtentBuffer()

Since: QGIS 3.10

Definition at line 91 of file qgsmapsettings.cpp.

◆ flags()

QgsMapSettings::Flags QgsMapSettings::flags ( ) const

Returns combination of flags used for rendering.

Definition at line 350 of file qgsmapsettings.cpp.

◆ fullExtent()

QgsRectangle QgsMapSettings::fullExtent ( ) const

returns current extent of layer set

Definition at line 592 of file qgsmapsettings.cpp.

◆ hasValidSettings()

bool QgsMapSettings::hasValidSettings ( ) const

Check whether the map settings are valid and can be used for rendering.

Definition at line 366 of file qgsmapsettings.cpp.

◆ labelBlockingRegions()

QList< QgsLabelBlockingRegion > QgsMapSettings::labelBlockingRegions ( ) const

inline

Returns the list of regions to avoid placing labels within.

See also: setLabelBlockingRegions(); labelBoundaryGeometry()

Since: QGIS 3.6

Definition at line 598 of file qgsmapsettings.h.

◆ labelBoundaryGeometry()

QgsGeometry QgsMapSettings::labelBoundaryGeometry ( ) const

Returns the label boundary geometry, which restricts where in the rendered map labels are permitted to be placed.

By default this is a null geometry, which indicates that labels can be placed anywhere within the map's visiblePolygon().

The geometry is specified using the map's destinationCrs().

See also: setLabelBoundaryGeometry(); labelBlockingRegions()

Since: QGIS 3.6

Definition at line 716 of file qgsmapsettings.cpp.

◆ labelingEngineSettings()

const QgsLabelingEngineSettings& QgsMapSettings::labelingEngineSettings ( ) const

inline

Returns the global configuration of the labeling engine.

See also: setLabelingEngineSettings()

Since: QGIS 3.0

Definition at line 554 of file qgsmapsettings.h.

◆ layerExtentToOutputExtent()

QgsRectangle QgsMapSettings::layerExtentToOutputExtent	(	const QgsMapLayer *	layer,
		QgsRectangle	extent
	)		const

transform bounding box from layer's CRS to output CRS

See also: layerToMapCoordinates( const QgsMapLayer *, QgsRectangle ) const if you want to transform a rectangle

Returns: a bounding box (aligned rectangle) containing the transformed extent

Definition at line 433 of file qgsmapsettings.cpp.

◆ layerIds()

QStringList QgsMapSettings::layerIds ( ) const

Gets list of layer IDs for map rendering The layers are stored in the reverse order of how they are rendered (layer with index 0 will be on top)

Definition at line 276 of file qgsmapsettings.cpp.

◆ layers()

QList< QgsMapLayer * > QgsMapSettings::layers ( ) const

Gets list of layers for map rendering The layers are stored in the reverse order of how they are rendered (layer with index 0 will be on top)

Definition at line 282 of file qgsmapsettings.cpp.

◆ layerStyleOverrides()

QMap< QString, QString > QgsMapSettings::layerStyleOverrides ( ) const

Gets map of map layer style overrides (key: layer ID, value: style name) where a different style should be used instead of the current one.

Since: QGIS 2.8

Definition at line 300 of file qgsmapsettings.cpp.

◆ layerToMapCoordinates() [1/3]

QgsPoint QgsMapSettings::layerToMapCoordinates	(	const QgsMapLayer *	layer,
		const QgsPoint &	point
	)		const

transform point coordinates from layer's CRS to output CRS

Returns: the transformed point

Since: QGIS 3.16

Definition at line 499 of file qgsmapsettings.cpp.

◆ layerToMapCoordinates() [2/3]

QgsPointXY QgsMapSettings::layerToMapCoordinates	(	const QgsMapLayer *	layer,
		QgsPointXY	point
	)		const

transform point coordinates from layer's CRS to output CRS

Returns: the transformed point

Definition at line 483 of file qgsmapsettings.cpp.

◆ layerToMapCoordinates() [3/3]

QgsRectangle QgsMapSettings::layerToMapCoordinates	(	const QgsMapLayer *	layer,
		QgsRectangle	rect
	)		const

transform rectangle from layer's CRS to output CRS

See also: layerExtentToOutputExtent() if you want to transform a bounding box

Returns: the transformed rectangle

Definition at line 520 of file qgsmapsettings.cpp.

◆ layerToMapUnits()

double QgsMapSettings::layerToMapUnits	(	const QgsMapLayer *	layer,
		const QgsRectangle &	referenceExtent = `QgsRectangle()`
	)		const

Computes an estimated conversion factor between layer and map units: layerUnits * layerToMapUnits = mapUnits.

Parameters

layer	The layer
referenceExtent	A reference extent based on which to perform the computation. If not specified, the layer extent is used

Since: QGIS 2.12

Definition at line 427 of file qgsmapsettings.cpp.

◆ layerTransform()

QgsCoordinateTransform QgsMapSettings::layerTransform ( const QgsMapLayer * layer ) const

Returns the coordinate transform from layer's CRS to destination CRS.

Returns: transform - may be invalid if the transform is not needed

Definition at line 419 of file qgsmapsettings.cpp.

◆ magnificationFactor()

double QgsMapSettings::magnificationFactor ( ) const

Returns the magnification factor.

See also: setMagnificationFactor()

Since: QGIS 2.16

Definition at line 69 of file qgsmapsettings.cpp.

◆ mapToLayerCoordinates() [1/3]

QgsPoint QgsMapSettings::mapToLayerCoordinates	(	const QgsMapLayer *	layer,
		const QgsPoint &	point
	)		const

transform point coordinates from output CRS to layer's CRS

Returns: the transformed point

Since: QGIS 3.16

Definition at line 553 of file qgsmapsettings.cpp.

◆ mapToLayerCoordinates() [2/3]

QgsPointXY QgsMapSettings::mapToLayerCoordinates	(	const QgsMapLayer *	layer,
		QgsPointXY	point
	)		const

transform point coordinates from output CRS to layer's CRS

Returns: the transformed point

Definition at line 537 of file qgsmapsettings.cpp.

◆ mapToLayerCoordinates() [3/3]

QgsRectangle QgsMapSettings::mapToLayerCoordinates	(	const QgsMapLayer *	layer,
		QgsRectangle	rect
	)		const

transform rectangle from output CRS to layer's CRS

See also: outputExtentToLayerExtent() if you want to transform a bounding box

Returns: the transformed rectangle

Definition at line 574 of file qgsmapsettings.cpp.

◆ mapToPixel()

const QgsMapToPixel& QgsMapSettings::mapToPixel ( ) const

inline

Definition at line 436 of file qgsmapsettings.h.

◆ mapUnits()

QgsUnitTypes::DistanceUnit QgsMapSettings::mapUnits ( ) const

Gets units of map's geographical coordinates - used for scale calculation.

Definition at line 360 of file qgsmapsettings.cpp.

◆ mapUnitsPerPixel()

double QgsMapSettings::mapUnitsPerPixel ( ) const

Returns the distance in geographical coordinates that equals to one pixel in the map.

Definition at line 391 of file qgsmapsettings.cpp.

◆ outputDpi()

double QgsMapSettings::outputDpi ( ) const

Returns DPI used for conversion between real world units (e.g.

mm) and pixels Default value is 96

Definition at line 263 of file qgsmapsettings.cpp.

◆ outputExtentToLayerExtent()

QgsRectangle QgsMapSettings::outputExtentToLayerExtent	(	const QgsMapLayer *	layer,
		QgsRectangle	extent
	)		const

transform bounding box from output CRS to layer's CRS

See also: mapToLayerCoordinates( const QgsMapLayer *, QgsRectangle ) const if you want to transform a rectangle

Returns: a bounding box (aligned rectangle) containing the transformed extent

Definition at line 458 of file qgsmapsettings.cpp.

◆ outputImageFormat()

QImage::Format QgsMapSettings::outputImageFormat ( ) const

inline

format of internal QImage, default QImage::Format_ARGB32_Premultiplied

Definition at line 361 of file qgsmapsettings.h.

◆ outputSize()

QSize QgsMapSettings::outputSize ( ) const

Returns the size of the resulting map image.

Definition at line 235 of file qgsmapsettings.cpp.

◆ pathResolver()

const QgsPathResolver& QgsMapSettings::pathResolver ( ) const

inline

Returns the path resolver for conversion between relative and absolute paths during rendering operations, e.g.

for resolving relative symbol paths.

See also: setPathResolver()

Since: QGIS 3.0

Definition at line 425 of file qgsmapsettings.h.

◆ readXml()

void QgsMapSettings::readXml ( QDomNode & node )

Definition at line 651 of file qgsmapsettings.cpp.

◆ renderedFeatureHandlers()

QList< QgsRenderedFeatureHandlerInterface * > QgsMapSettings::renderedFeatureHandlers ( ) const

Returns the list of rendered feature handlers to use while rendering the map settings.

See also: addRenderedFeatureHandler()

Since: QGIS 3.10

Definition at line 746 of file qgsmapsettings.cpp.

◆ rotation()

double QgsMapSettings::rotation ( ) const

Returns the rotation of the resulting map image, in degrees clockwise.

See also: setRotation()

Since: QGIS 2.8

Definition at line 101 of file qgsmapsettings.cpp.

◆ scale()

double QgsMapSettings::scale ( ) const

Returns the calculated map scale.

The scale value indicates the scale denominator, e.g. 1000.0 for a 1:1000 map.

Definition at line 396 of file qgsmapsettings.cpp.

◆ segmentationTolerance()

double QgsMapSettings::segmentationTolerance ( ) const

inline

Gets the segmentation tolerance applied when rendering curved geometries.

Definition at line 521 of file qgsmapsettings.h.

◆ segmentationToleranceType()

QgsAbstractGeometry::SegmentationToleranceType QgsMapSettings::segmentationToleranceType ( ) const

inline

Gets segmentation tolerance type (maximum angle or maximum difference between curve and approximation)

Definition at line 529 of file qgsmapsettings.h.

◆ selectionColor()

QColor QgsMapSettings::selectionColor ( ) const

inline

Gets color that is used for drawing of selected vector features.

Definition at line 298 of file qgsmapsettings.h.

◆ setBackgroundColor()

void QgsMapSettings::setBackgroundColor ( const QColor & color )

inline

Sets the background color of the map.

Definition at line 291 of file qgsmapsettings.h.

◆ setClippingRegions()

void QgsMapSettings::setClippingRegions ( const QList< QgsMapClippingRegion > & regions )

Sets the list of clipping regions to apply to the map.

See also: addClippingRegion(); clippingRegions()

Since: QGIS 3.16

Definition at line 731 of file qgsmapsettings.cpp.

◆ setCustomRenderFlags()

Q_DECL_DEPRECATED void QgsMapSettings::setCustomRenderFlags ( const QString & customRenderFlags )

inline

Sets the custom rendering flags.

Layers might honour these to alter their rendering.

Parameters

customRenderFlags custom flags strings, separated by ';'

See also: customRenderFlags()

Since: QGIS 2.16

Deprecated:: use

See also: setCustomRenderingFlag() instead.

Definition at line 237 of file qgsmapsettings.h.

◆ setCustomRenderingFlag()

void QgsMapSettings::setCustomRenderingFlag	(	const QString &	flag,
		const QVariant &	value
	)

inline

Sets a custom rendering flag.

Layers might honour these to alter their rendering.

Parameters

flag	the flag name
value	the flag value

See also: customRenderingFlags()

Since: QGIS 3.12

Definition at line 254 of file qgsmapsettings.h.

◆ setDestinationCrs()

void QgsMapSettings::setDestinationCrs ( const QgsCoordinateReferenceSystem & crs )

sets destination coordinate reference system

Definition at line 310 of file qgsmapsettings.cpp.

◆ setDevicePixelRatio()

void QgsMapSettings::setDevicePixelRatio ( float dpr )

Sets the device pixel ratio Common values are 1 for normal-dpi displays and 2 for high-dpi "retina" displays.

Since: QGIS 3.4

Definition at line 252 of file qgsmapsettings.cpp.

◆ setEllipsoid()

bool QgsMapSettings::setEllipsoid ( const QString & ellipsoid )

Sets the ellipsoid by its acronym.

Known ellipsoid acronyms can be retrieved using QgsEllipsoidUtils::acronyms(). Calculations will only use the ellipsoid if a valid ellipsoid has been set.

Returns: true if ellipsoid was successfully set

See also: ellipsoid()

Since: QGIS 3.0

Definition at line 323 of file qgsmapsettings.cpp.

◆ setExpressionContext()

void QgsMapSettings::setExpressionContext ( const QgsExpressionContext & context )

inline

Sets the expression context.

This context is used for all expression evaluation associated with this map settings.

See also: expressionContext()

Since: QGIS 2.12

Definition at line 388 of file qgsmapsettings.h.

◆ setExtent()

void QgsMapSettings::setExtent	(	const QgsRectangle &	rect,
		bool	magnified = `true`
	)

Set coordinates of the rectangle which should be rendered.

The actual visible extent used for rendering could be slightly different since the given extent may be expanded in order to fit the aspect ratio of output size. Use visibleExtent() to get the resulting extent.

Definition at line 79 of file qgsmapsettings.cpp.

◆ setExtentBuffer()

void QgsMapSettings::setExtentBuffer ( double buffer )

Sets the buffer in map units to use around the visible extent for rendering symbols whose corresponding geometries are outside the visible extent.

This is useful when using tiles to avoid cut symbols at tile boundaries.

Since: QGIS 3.10

Definition at line 96 of file qgsmapsettings.cpp.

◆ setFlag()

void QgsMapSettings::setFlag	(	QgsMapSettings::Flag	flag,
		bool	on = `true`
	)

Enable or disable a particular flag (other flags are not affected)

Definition at line 342 of file qgsmapsettings.cpp.

◆ setFlags()

void QgsMapSettings::setFlags ( QgsMapSettings::Flags flags )

Sets combination of flags that will be used for rendering.

Definition at line 337 of file qgsmapsettings.cpp.

◆ setLabelBlockingRegions()

void QgsMapSettings::setLabelBlockingRegions ( const QList< QgsLabelBlockingRegion > & regions )

inline

Sets a list of regions to avoid placing labels within.

See also: labelBlockingRegions(); setLabelBoundaryGeometry()

Since: QGIS 3.6

Definition at line 590 of file qgsmapsettings.h.

◆ setLabelBoundaryGeometry()

void QgsMapSettings::setLabelBoundaryGeometry ( const QgsGeometry & boundary )

Sets the label boundary geometry, which restricts where in the rendered map labels are permitted to be placed.

A null boundary geometry (the default) indicates that labels can be placed anywhere within the map's visiblePolygon().

The geometry is specified using the map's destinationCrs().

See also: labelBoundaryGeometry(); setLabelBlockingRegions()

Since: QGIS 3.6

Definition at line 721 of file qgsmapsettings.cpp.

◆ setLabelingEngineSettings()

void QgsMapSettings::setLabelingEngineSettings ( const QgsLabelingEngineSettings & settings )

inline

Sets the global configuration of the labeling engine.

Note: Calling this method will reset the textRenderFormat() to match the default text render format from the label engine settings.

See also: labelingEngineSettings()

Since: QGIS 3.0

Definition at line 541 of file qgsmapsettings.h.

◆ setLayers()

void QgsMapSettings::setLayers ( const QList< QgsMapLayer * > & layers )

Set list of layers for map rendering.

The layers must be registered in QgsProject. The layers are stored in the reverse order of how they are rendered (layer with index 0 will be on top)

Note: Any non-spatial layers will be automatically stripped from the list (since they cannot be rendered!).

Definition at line 287 of file qgsmapsettings.cpp.

◆ setLayerStyleOverrides()

void QgsMapSettings::setLayerStyleOverrides ( const QMap< QString, QString > & overrides )

Set map of map layer style overrides (key: layer ID, value: style name) where a different style should be used instead of the current one.

Since: QGIS 2.8

Definition at line 305 of file qgsmapsettings.cpp.

◆ setMagnificationFactor()

void QgsMapSettings::setMagnificationFactor	(	double	factor,
		const QgsPointXY *	center = `nullptr`
	)

Set the magnification factor.

Parameters

factor	the factor of magnification
center	optional point to re-center the map

See also: magnificationFactor()

Since: QGIS 2.16

Definition at line 48 of file qgsmapsettings.cpp.

◆ setOutputDpi()

void QgsMapSettings::setOutputDpi ( double dpi )

Sets DPI used for conversion between real world units (e.g. mm) and pixels.

Definition at line 268 of file qgsmapsettings.cpp.

◆ setOutputImageFormat()

void QgsMapSettings::setOutputImageFormat ( QImage::Format format )

inline

sets format of internal QImage

Definition at line 359 of file qgsmapsettings.h.

◆ setOutputSize()

void QgsMapSettings::setOutputSize ( QSize size )

Sets the size of the resulting map image.

Definition at line 240 of file qgsmapsettings.cpp.

◆ setPathResolver()

void QgsMapSettings::setPathResolver ( const QgsPathResolver & resolver )

inline

Sets the path resolver for conversion between relative and absolute paths during rendering operations, e.g.

for resolving relative symbol paths.

See also: pathResolver()

Since: QGIS 3.0

Definition at line 434 of file qgsmapsettings.h.

◆ setRotation()

void QgsMapSettings::setRotation ( double rotation )

Sets the rotation of the resulting map image, in degrees clockwise.

See also: rotation()

Since: QGIS 2.8

Definition at line 106 of file qgsmapsettings.cpp.

◆ setSegmentationTolerance()

void QgsMapSettings::setSegmentationTolerance ( double tolerance )

inline

Sets the segmentation tolerance applied when rendering curved geometries.

Parameters

tolerance the segmentation tolerance

Definition at line 519 of file qgsmapsettings.h.

◆ setSegmentationToleranceType()

void QgsMapSettings::setSegmentationToleranceType ( QgsAbstractGeometry::SegmentationToleranceType type )

inline

Sets segmentation tolerance type (maximum angle or maximum difference between curve and approximation)

Parameters

type	the segmentation tolerance typename

Definition at line 527 of file qgsmapsettings.h.

◆ setSelectionColor()

void QgsMapSettings::setSelectionColor ( const QColor & color )

inline

Sets color that is used for drawing of selected vector features.

Definition at line 296 of file qgsmapsettings.h.

◆ setSimplifyMethod()

void QgsMapSettings::setSimplifyMethod ( const QgsVectorSimplifyMethod & method )

inline

Sets the simplification setting to use when rendering vector layers.

If the simplify method is enabled, it will override all other layer-specific simplification settings and will apply to all vector layers rendered for the map.

This can be used to specify global simplification methods to apply during map exports, e.g. to allow vector layers to be simplified to an appropriate maximum level of detail during PDF exports.

The default is to use no global simplification, and fallback to individual layer's settings instead.

See also: simplifyMethod()

Since: QGIS 3.10

Definition at line 646 of file qgsmapsettings.h.

◆ setTextRenderFormat()

void QgsMapSettings::setTextRenderFormat ( QgsRenderContext::TextRenderFormat format )

inline

Sets the text render format, which dictates how text is rendered (e.g.

as paths or real text objects).

Warning: Calling the setLabelingEngineSettings() method will reset the text render format to match the default text render format from the label engine settings.

See also: textRenderFormat()

Since: QGIS 3.4.3

Definition at line 350 of file qgsmapsettings.h.

◆ setTransformContext()

void QgsMapSettings::setTransformContext ( const QgsCoordinateTransformContext & context )

Sets the coordinate transform context, which stores various information regarding which datum transforms should be used when transforming points from a source to destination coordinate reference system.

See also: transformContext()

Since: QGIS 3.0

Definition at line 411 of file qgsmapsettings.cpp.

◆ simplifyMethod()

const QgsVectorSimplifyMethod& QgsMapSettings::simplifyMethod ( ) const

inline

Returns the simplification settings to use when rendering vector layers.

If enabled, it will override all other layer-specific simplification settings and will apply to all vector layers rendered for the map.

The default is to use no global simplification, and fallback to individual layer's settings instead.

See also: setSimplifyMethod()

Since: QGIS 3.10

Definition at line 659 of file qgsmapsettings.h.

◆ testFlag()

bool QgsMapSettings::testFlag ( QgsMapSettings::Flag flag ) const

Check whether a particular flag is enabled.

Definition at line 355 of file qgsmapsettings.cpp.

◆ textRenderFormat()

QgsRenderContext::TextRenderFormat QgsMapSettings::textRenderFormat ( ) const

inline

Returns the text render format, which dictates how text is rendered (e.g.

as paths or real text objects).

See also: setTextRenderFormat()

Since: QGIS 3.4.3

Definition at line 336 of file qgsmapsettings.h.

◆ transformContext()

QgsCoordinateTransformContext QgsMapSettings::transformContext ( ) const

Returns the coordinate transform context, which stores various information regarding which datum transforms should be used when transforming points from a source to destination coordinate reference system.

See also: setTransformContext()

Since: QGIS 3.0

Definition at line 401 of file qgsmapsettings.cpp.

◆ updateDerived()

void QgsMapSettings::updateDerived ( )

protected

Definition at line 118 of file qgsmapsettings.cpp.

◆ visibleExtent()

QgsRectangle QgsMapSettings::visibleExtent ( ) const

Returns the actual extent derived from requested extent that takes takes output image size into account.

Definition at line 371 of file qgsmapsettings.cpp.

◆ visiblePolygon()

QPolygonF QgsMapSettings::visiblePolygon ( ) const

Returns the visible area as a polygon (may be rotated)

Since: QGIS 2.8

Definition at line 376 of file qgsmapsettings.cpp.

◆ writeXml()

void QgsMapSettings::writeXml	(	QDomNode &	node,
		QDomDocument &	doc
	)

Definition at line 686 of file qgsmapsettings.cpp.

Member Data Documentation

◆ mBackgroundColor

QColor QgsMapSettings::mBackgroundColor

protected

Definition at line 703 of file qgsmapsettings.h.

◆ mCustomRenderFlags

QString QgsMapSettings::mCustomRenderFlags

protected

Definition at line 695 of file qgsmapsettings.h.

◆ mCustomRenderingFlags

QVariantMap QgsMapSettings::mCustomRenderingFlags

protected

Definition at line 696 of file qgsmapsettings.h.

◆ mDestCRS

QgsCoordinateReferenceSystem QgsMapSettings::mDestCRS

protected

Definition at line 699 of file qgsmapsettings.h.

◆ mDevicePixelRatio

float QgsMapSettings::mDevicePixelRatio = 1.0

protected

Definition at line 684 of file qgsmapsettings.h.

◆ mDpi

double QgsMapSettings::mDpi

protected

Definition at line 681 of file qgsmapsettings.h.

◆ mEllipsoid

QString QgsMapSettings::mEllipsoid

protected

ellipsoid acronym (from table tbl_ellipsoids)

Definition at line 701 of file qgsmapsettings.h.

◆ mExpressionContext

QgsExpressionContext QgsMapSettings::mExpressionContext

protected

Definition at line 697 of file qgsmapsettings.h.

◆ mExtent

QgsRectangle QgsMapSettings::mExtent

protected

Definition at line 686 of file qgsmapsettings.h.

◆ mExtentBuffer

double QgsMapSettings::mExtentBuffer = 0.0

protected

Definition at line 687 of file qgsmapsettings.h.

◆ mFlags

Flags QgsMapSettings::mFlags

protected

Definition at line 706 of file qgsmapsettings.h.

◆ mImageFormat

QImage::Format QgsMapSettings::mImageFormat = QImage::Format_ARGB32_Premultiplied

protected

Definition at line 708 of file qgsmapsettings.h.

◆ mLabelBoundaryGeometry

QgsGeometry QgsMapSettings::mLabelBoundaryGeometry

protected

Definition at line 731 of file qgsmapsettings.h.

◆ mLabelingEngineSettings

QgsLabelingEngineSettings QgsMapSettings::mLabelingEngineSettings

protected

Definition at line 713 of file qgsmapsettings.h.

◆ mLayers

QgsWeakMapLayerPointerList QgsMapSettings::mLayers

protected

list of layers to be rendered (stored as weak pointers)

Definition at line 693 of file qgsmapsettings.h.

◆ mLayerStyleOverrides

QMap<QString, QString> QgsMapSettings::mLayerStyleOverrides

protected

Definition at line 694 of file qgsmapsettings.h.

◆ mMagnificationFactor

double QgsMapSettings::mMagnificationFactor = 1.0

protected

Definition at line 690 of file qgsmapsettings.h.

◆ mMapToPixel

QgsMapToPixel QgsMapSettings::mMapToPixel

protected

Definition at line 723 of file qgsmapsettings.h.

◆ mMapUnitsPerPixel

double QgsMapSettings::mMapUnitsPerPixel = 1

protected

Definition at line 718 of file qgsmapsettings.h.

◆ mPathResolver

QgsPathResolver QgsMapSettings::mPathResolver

protected

Definition at line 727 of file qgsmapsettings.h.

◆ mRotation

double QgsMapSettings::mRotation = 0.0

protected

Definition at line 689 of file qgsmapsettings.h.

◆ mScale

double QgsMapSettings::mScale = 1

protected

Definition at line 719 of file qgsmapsettings.h.

◆ mScaleCalculator

QgsScaleCalculator QgsMapSettings::mScaleCalculator

protected

Definition at line 722 of file qgsmapsettings.h.

◆ mSegmentationTolerance

double QgsMapSettings::mSegmentationTolerance

protected

Definition at line 710 of file qgsmapsettings.h.

◆ mSegmentationToleranceType

QgsAbstractGeometry::SegmentationToleranceType QgsMapSettings::mSegmentationToleranceType = QgsAbstractGeometry::MaximumAngle

protected

Definition at line 711 of file qgsmapsettings.h.

◆ mSelectionColor

QColor QgsMapSettings::mSelectionColor

protected

Definition at line 704 of file qgsmapsettings.h.

◆ mSimplifyMethod

QgsVectorSimplifyMethod QgsMapSettings::mSimplifyMethod

protected

Definition at line 733 of file qgsmapsettings.h.

◆ mSize

QSize QgsMapSettings::mSize

protected

Definition at line 683 of file qgsmapsettings.h.

◆ mTextRenderFormat

QgsRenderContext::TextRenderFormat QgsMapSettings::mTextRenderFormat = QgsRenderContext::TextFormatAlwaysOutlines

protected

Definition at line 729 of file qgsmapsettings.h.

◆ mTransformContext

QgsCoordinateTransformContext QgsMapSettings::mTransformContext

protected

Definition at line 725 of file qgsmapsettings.h.

◆ mValid

bool QgsMapSettings::mValid = false

protected

Whether the actual settings are valid (set in updateDerived())

Definition at line 716 of file qgsmapsettings.h.

◆ mVisibleExtent

QgsRectangle QgsMapSettings::mVisibleExtent

protected

Extent with some additional white space that matches the output aspect ratio.

Definition at line 717 of file qgsmapsettings.h.

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

/build/qgis-3.16.0+99unstable/src/core/qgsmapsettings.h
/build/qgis-3.16.0+99unstable/src/core/qgsmapsettings.cpp

Public Types

Public Member Functions

Protected Member Functions

Protected Attributes

Detailed Description

Member Enumeration Documentation

◆ Flag

Constructor & Destructor Documentation

◆ QgsMapSettings()

Member Function Documentation

◆ addClippingRegion()

◆ addRenderedFeatureHandler()

◆ backgroundColor()

◆ clearCustomRenderingFlag()

◆ clippingRegions()

◆ customRenderFlags()

◆ customRenderingFlags()

◆ destinationCrs()

◆ deviceOutputSize()

◆ devicePixelRatio()

◆ ellipsoid()

◆ expressionContext()

◆ extent()

◆ extentBuffer()

◆ flags()

◆ fullExtent()

◆ hasValidSettings()

◆ labelBlockingRegions()

◆ labelBoundaryGeometry()

◆ labelingEngineSettings()

◆ layerExtentToOutputExtent()

◆ layerIds()

◆ layers()

◆ layerStyleOverrides()

◆ layerToMapCoordinates() [1/3]

◆ layerToMapCoordinates() [2/3]

◆ layerToMapCoordinates() [3/3]

◆ layerToMapUnits()

◆ layerTransform()

◆ magnificationFactor()

◆ mapToLayerCoordinates() [1/3]

◆ mapToLayerCoordinates() [2/3]

◆ mapToLayerCoordinates() [3/3]

◆ mapToPixel()

◆ mapUnits()

◆ mapUnitsPerPixel()

◆ outputDpi()

◆ outputExtentToLayerExtent()

◆ outputImageFormat()

◆ outputSize()

◆ pathResolver()

◆ readXml()

◆ renderedFeatureHandlers()

◆ rotation()

◆ scale()

◆ segmentationTolerance()

◆ segmentationToleranceType()

◆ selectionColor()

◆ setBackgroundColor()

◆ setClippingRegions()

◆ setCustomRenderFlags()

◆ setCustomRenderingFlag()

◆ setDestinationCrs()

◆ setDevicePixelRatio()

◆ setEllipsoid()

◆ setExpressionContext()

◆ setExtent()

◆ setExtentBuffer()

◆ setFlag()

◆ setFlags()

◆ setLabelBlockingRegions()

◆ setLabelBoundaryGeometry()

◆ setLabelingEngineSettings()

◆ setLayers()

◆ setLayerStyleOverrides()

◆ setMagnificationFactor()

◆ setOutputDpi()

◆ setOutputImageFormat()

◆ setOutputSize()

◆ setPathResolver()