QgsWms::QgsWmsRenderContext Class Reference

Rendering context for the WMS renderer. More...

#include <qgswmsrendercontext.h>

Public Types
enum	Flag {   UseScaleDenominator = 0x01 , UseOpacity = 0x02 , UseFilter = 0x04 , UseSelection = 0x08 ,   AddHighlightLayers = 0x10 , UpdateExtent = 0x20 , SetAccessControl = 0x40 , AddQueryLayers = 0x80 ,   UseWfsLayersOnly = 0x100 , AddExternalLayers = 0x200 , UseSrcWidthHeight = 0x400 , UseTileBuffer = 0x800 ,   AddAllLayers = 0x1000 }
	Available rendering options. More...

Public Member Functions
	QgsWmsRenderContext (const QgsProject *project, QgsServerInterface *interface)
	Constructor for QgsWmsRenderContext. More...
	~QgsWmsRenderContext ()
	Destructor for QgsWmsRenderContext. More...
qreal	dotsPerMm () const
	Returns default dots per mm according to the current configuration. More...
QStringList	flattenedQueryLayers (const QStringList &layerNames) const
	Returns a list of query layer names where group names are replaced by the names of their layer components. More...
int	imageQuality () const
	Returns the image quality to use for rendering according to the current configuration. More...
bool	isExternalLayer (const QString &name) const
	Returns true if the layer is an external layer, false otherwise. More...
bool	isValidGroup (const QString &name) const
	Returns true if name is a group. More...
bool	isValidLayer (const QString &nickname) const
	Returns true if the layer has to be rendered, false otherwise. More...
bool	isValidWidthHeight () const
	Returns true if width and height are valid according to the maximum values defined within the project, false otherwise. More...
bool	isValidWidthHeight (int width, int height) const
	Returns true if width and height are valid according to the maximum image width/height. More...
QgsMapLayer *	layer (const QString &nickname) const
	Returns the layer corresponding to the nickname, or a nullptr if not found or if the layer do not need to be rendered. More...
QMap< QString, QList< QgsMapLayer * > >	layerGroups () const
	Returns a map having layer group names as keys and a list of layers as values. More...
QString	layerNickname (const QgsMapLayer &layer) const
	Returns the nickname (short name, id or name) of the layer according to the current configuration. More...
QList< QgsMapLayer * >	layers () const
	Returns a list of all layers read from the project. More...
QList< QgsMapLayer * >	layersFromGroup (const QString &nickname) const
	Returns the group's layers list corresponding to the nickname, or an empty list if not found. More...
QList< QgsMapLayer * >	layersToRender () const
	Returns a list of all layers to actually render according to the current configuration. More...
int	mapHeight () const
	Returns HEIGHT or SRCHEIGHT according to UseSrcWidthHeight flag. More...
QSize	mapSize (bool aspectRatio=true) const
	Returns the size (in pixels) of the map to render, according to width and height WMS parameters as well as the aspectRatio option. More...
double	mapTileBuffer (int mapWidth) const
	Returns the tile buffer in geographical units for the given map width in pixels. More...
int	mapWidth () const
	Returns WIDTH or SRCWIDTH according to UseSrcWidthHeight flag. More...
QgsWmsParameters	parameters () const
	Returns WMS parameters. More...
QgsWmsParametersLayer	parameters (const QgsMapLayer &layer) const
	Returns WMS parameters for a specific layer. More...
int	precision () const
	Returns the precision to use according to the current configuration. More...
const QgsProject *	project () const
	Returns the project. More...
bool	renderMapTiles () const
	Returns true if WMS requests should use the QgsMapSettings::RenderMapTile flag, so that no visible artifacts are visible between adjacent tiles. More...
double	scaleDenominator () const
	Returns the scale denominator to use for rendering according to the current configuration. More...
void	setFlag (Flag flag, bool on=true)
	Sets or unsets a rendering flag according to the on value. More...
void	setParameters (const QgsWmsParameters &parameters)
	Sets WMS parameters. More...
void	setScaleDenominator (double scaleDenominator)
	Sets a custom scale denominator. More...
const QgsServerSettings &	settings () const
	Returns settings of the server. More...
QDomElement	sld (const QgsMapLayer &layer) const
	Returns a SLD document for a specific layer. More...
QString	style (const QgsMapLayer &layer) const
	Returns a style's name for a specific layer. More...
bool	testFlag (Flag flag) const
	Returns the status of a rendering flag. More...
int	tileBuffer () const
	Returns the tile buffer value to use for rendering according to the current configuration. More...
bool	updateExtent () const
	Returns true if the extent has to be updated before the rendering, false otherwise. More...

Detailed Description

Rendering context for the WMS renderer.

Since

QGIS 3.8

Definition at line 34 of file qgswmsrendercontext.h.

Member Enumeration Documentation

Flag

enum QgsWms::QgsWmsRenderContext::Flag

Available rendering options.

Enumerator
UseScaleDenominator
UseOpacity
UseFilter
UseSelection
AddHighlightLayers
UpdateExtent
SetAccessControl
AddQueryLayers
UseWfsLayersOnly
AddExternalLayers
UseSrcWidthHeight
UseTileBuffer
AddAllLayers	For GetPrint: add layers from LAYER(S) parameter.

Definition at line 38 of file qgswmsrendercontext.h.

Constructor & Destructor Documentation

~QgsWmsRenderContext()

QgsWmsRenderContext::~QgsWmsRenderContext

(

)

Destructor for QgsWmsRenderContext.

Definition at line 35 of file qgswmsrendercontext.cpp.

QgsWmsRenderContext()

QgsWmsRenderContext::QgsWmsRenderContext	(	const QgsProject *	project,
		QgsServerInterface *	interface
	)

Constructor for QgsWmsRenderContext.

Parameters

project	The project to use for the rendering
interface	The server interface

Definition at line 28 of file qgswmsrendercontext.cpp.

Member Function Documentation

dotsPerMm()

qreal QgsWmsRenderContext::dotsPerMm

(

)

const

Returns default dots per mm according to the current configuration.

Definition at line 172 of file qgswmsrendercontext.cpp.

flattenedQueryLayers()

QStringList QgsWmsRenderContext::flattenedQueryLayers

(

const QStringList &

layerNames

)

const

Returns a list of query layer names where group names are replaced by the names of their layer components.

Since

QGIS 3.8

Definition at line 187 of file qgswmsrendercontext.cpp.

imageQuality()

int QgsWmsRenderContext::imageQuality

(

)

const

Returns the image quality to use for rendering according to the current configuration.

Definition at line 131 of file qgswmsrendercontext.cpp.

isExternalLayer()

bool QgsWmsRenderContext::isExternalLayer

(

const QString &

name

)

const

Returns true if the layer is an external layer, false otherwise.

Since

QGIS 3.16

Definition at line 826 of file qgswmsrendercontext.cpp.

isValidGroup()

bool QgsWmsRenderContext::isValidGroup

(

const QString &

name

)

const

Returns true if name is a group.

Definition at line 315 of file qgswmsrendercontext.cpp.

isValidLayer()

bool QgsWmsRenderContext::isValidLayer

(

const QString &

nickname

)

const

Returns true if the layer has to be rendered, false otherwise.

Definition at line 305 of file qgswmsrendercontext.cpp.

isValidWidthHeight() [1/2]

bool QgsWmsRenderContext::isValidWidthHeight

(

)

const

Returns true if width and height are valid according to the maximum values defined within the project, false otherwise.

Since

QGIS 3.8

Definition at line 632 of file qgswmsrendercontext.cpp.

isValidWidthHeight() [2/2]

bool QgsWmsRenderContext::isValidWidthHeight	(	int	width,
		int	height
	)		const

Returns true if width and height are valid according to the maximum image width/height.

Parameters

width	the image width in pixels
height	the image height in pixels

Since

QGIS 3.22

Definition at line 637 of file qgswmsrendercontext.cpp.

layer()

QgsMapLayer * QgsWmsRenderContext::layer

(

const QString &

nickname

)

const

Returns the layer corresponding to the nickname, or a nullptr if not found or if the layer do not need to be rendered.

Definition at line 289 of file qgswmsrendercontext.cpp.

layerGroups()

QMap< QString, QList< QgsMapLayer * > > QgsWmsRenderContext::layerGroups

(

)

const

Returns a map having layer group names as keys and a list of layers as values.

Since

QGIS 3.8

Definition at line 601 of file qgswmsrendercontext.cpp.

layerNickname()

QString QgsWmsRenderContext::layerNickname

(

const QgsMapLayer &

layer

)

const

Returns the nickname (short name, id or name) of the layer according to the current configuration.

Definition at line 268 of file qgswmsrendercontext.cpp.

layers()

QList< QgsMapLayer * > QgsWmsRenderContext::layers

(

)

const

Returns a list of all layers read from the project.

Definition at line 229 of file qgswmsrendercontext.cpp.

layersFromGroup()

QList< QgsMapLayer * > QgsWmsRenderContext::layersFromGroup

(

const QString &

nickname

)

const

Returns the group's layers list corresponding to the nickname, or an empty list if not found.

Definition at line 310 of file qgswmsrendercontext.cpp.

layersToRender()

QList< QgsMapLayer * > QgsWmsRenderContext::layersToRender

(

)

const

Returns a list of all layers to actually render according to the current configuration.

Definition at line 224 of file qgswmsrendercontext.cpp.

mapHeight()

int QgsWmsRenderContext::mapHeight

(

)

const

Returns HEIGHT or SRCHEIGHT according to UseSrcWidthHeight flag.

Definition at line 619 of file qgswmsrendercontext.cpp.

mapSize()

QSize QgsWmsRenderContext::mapSize

(

bool

aspectRatio = true

)

const

Returns the size (in pixels) of the map to render, according to width and height WMS parameters as well as the aspectRatio option.

Since

QGIS 3.8

Definition at line 731 of file qgswmsrendercontext.cpp.

mapTileBuffer()

double QgsWmsRenderContext::mapTileBuffer

(

int

mapWidth

)

const

Returns the tile buffer in geographical units for the given map width in pixels.

Since

QGIS 3.10

Definition at line 711 of file qgswmsrendercontext.cpp.

mapWidth()

int QgsWmsRenderContext::mapWidth

(

)

const

Returns WIDTH or SRCWIDTH according to UseSrcWidthHeight flag.

Definition at line 606 of file qgswmsrendercontext.cpp.

parameters() [1/2]

QgsWmsParameters QgsWmsRenderContext::parameters

(

)

const

Returns WMS parameters.

Definition at line 72 of file qgswmsrendercontext.cpp.

parameters() [2/2]

QgsWmsParametersLayer QgsWmsRenderContext::parameters

(

const QgsMapLayer &

layer

)

const

Returns WMS parameters for a specific layer.

An empty instance is returned if not available.

Definition at line 113 of file qgswmsrendercontext.cpp.

precision()

int QgsWmsRenderContext::precision

(

)

const

Returns the precision to use according to the current configuration.

Definition at line 160 of file qgswmsrendercontext.cpp.

project()

const QgsProject * QgsWmsRenderContext::project

(

)

const

Returns the project.

Definition at line 82 of file qgswmsrendercontext.cpp.

renderMapTiles()

bool QgsWmsRenderContext::renderMapTiles

(

)

const

Returns true if WMS requests should use the QgsMapSettings::RenderMapTile flag, so that no visible artifacts are visible between adjacent tiles.

This flag can slow down rendering considerably, so it is only used if the corresponding if explicitly opted in.

Since

QGIS 3.18

Definition at line 155 of file qgswmsrendercontext.cpp.

scaleDenominator()

double QgsWmsRenderContext::scaleDenominator

(

)

const

Returns the scale denominator to use for rendering according to the current configuration.

Definition at line 234 of file qgswmsrendercontext.cpp.

setFlag()

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

Sets or unsets a rendering flag according to the on value.

Definition at line 55 of file qgswmsrendercontext.cpp.

setParameters()

void QgsWmsRenderContext::setParameters

(

const QgsWmsParameters &

parameters

)

Sets WMS parameters.

Definition at line 41 of file qgswmsrendercontext.cpp.

setScaleDenominator()

void QgsWmsRenderContext::setScaleDenominator

(

double

scaleDenominator

)

Sets a custom scale denominator.

In this case, layers to render are updated according to their scale visibility.

Definition at line 250 of file qgswmsrendercontext.cpp.

settings()

const QgsServerSettings & QgsWmsRenderContext::settings

(

)

const

Returns settings of the server.

Definition at line 77 of file qgswmsrendercontext.cpp.

sld()

QDomElement QgsWmsRenderContext::sld

(

const QgsMapLayer &

layer

)

const

Returns a SLD document for a specific layer.

An empty document is returned if not available.

Definition at line 87 of file qgswmsrendercontext.cpp.

style()

QString QgsWmsRenderContext::style

(

const QgsMapLayer &

layer

)

const

Returns a style's name for a specific layer.

An empty string is returned if not available.

Definition at line 100 of file qgswmsrendercontext.cpp.

testFlag()

bool QgsWmsRenderContext::testFlag

(

Flag

flag

)

const

Returns the status of a rendering flag.

Parameters

flag	The flag to test

Returns

true if the rendering option is activated, false otherwise

Definition at line 67 of file qgswmsrendercontext.cpp.

tileBuffer()

int QgsWmsRenderContext::tileBuffer

(

)

const

Returns the tile buffer value to use for rendering according to the current configuration.

Since

QGIS 3.10

Definition at line 143 of file qgswmsrendercontext.cpp.

updateExtent()

bool QgsWmsRenderContext::updateExtent

(

)

const

Returns true if the extent has to be updated before the rendering, false otherwise.

Definition at line 256 of file qgswmsrendercontext.cpp.

---

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

• /build/qgis-3.28.0+99sid/src/server/services/wms/qgswmsrendercontext.h
• /build/qgis-3.28.0+99sid/src/server/services/wms/qgswmsrendercontext.cpp