QgsVectorTileMVTEncoder Class Reference

Handles conversion of vector features to Mapbox vector tiles encoding. More...

#include <qgsvectortilemvtencoder.h>

Public Member Functions
	QgsVectorTileMVTEncoder (QgsTileXYZ tileID)
	Creates MVT encoder for the given tile coordinates. More...
void	addLayer (QgsVectorLayer *layer, QgsFeedback *feedback=nullptr, QString filterExpression=QString(), QString layerName=QString())
	Fetches data from vector layer for the given tile, does reprojection and clipping. More...
QByteArray	encode () const
	Encodes MVT using data stored previously with addLayer() calls. More...
int	resolution () const
	Returns resolution of coordinates of geometries within the tile. The default is 4096. More...
void	setResolution (int extent)
	Sets the resolution of coordinates of geometries within the tile. More...
void	setTileBuffer (int buffer)
	Sets size of the buffer zone around tile edges in integer tile coordinates. More...
void	setTransformContext (const QgsCoordinateTransformContext &transformContext)
	Sets coordinate transform context for transforms between layers and tile matrix CRS. More...
int	tileBuffer () const
	Returns size of the buffer zone around tile edges in integer tile coordinates. The default is 256 (~6%) More...

Detailed Description

Handles conversion of vector features to Mapbox vector tiles encoding.

Geometries are stored as a series of MoveTo / LineTo / ClosePath commands with coordinates in integer values (see resolution(), called "extent" in the spec). Attributes are stored as key-value pairs of tags: keys are always strings, values can be integers, floating point numbers, booleans or strings.

See the specification for details: https://github.com/mapbox/vector-tile-spec/blob/master/2.1/README.md

Since

QGIS 3.14

Definition at line 40 of file qgsvectortilemvtencoder.h.

Constructor & Destructor Documentation

QgsVectorTileMVTEncoder()

QgsVectorTileMVTEncoder::QgsVectorTileMVTEncoder ( QgsTileXYZ  tileID )

explicit

Creates MVT encoder for the given tile coordinates.

Definition at line 143 of file qgsvectortilemvtencoder.cpp.

Member Function Documentation

addLayer()

void QgsVectorTileMVTEncoder::addLayer	(	QgsVectorLayer *	layer,
		QgsFeedback *	feedback = nullptr,
		QString	filterExpression = QString(),
		QString	layerName = QString()
	)

Fetches data from vector layer for the given tile, does reprojection and clipping.

Optional feedback object may be provided to support cancellation.

Definition at line 150 of file qgsvectortilemvtencoder.cpp.

encode()

QByteArray QgsVectorTileMVTEncoder::encode

(

)

const

Encodes MVT using data stored previously with addLayer() calls.

Definition at line 369 of file qgsvectortilemvtencoder.cpp.

resolution()

int QgsVectorTileMVTEncoder::resolution ( ) const

inline

Returns resolution of coordinates of geometries within the tile. The default is 4096.

Definition at line 47 of file qgsvectortilemvtencoder.h.

setResolution()

void QgsVectorTileMVTEncoder::setResolution ( int  extent )

inline

Sets the resolution of coordinates of geometries within the tile.

Definition at line 49 of file qgsvectortilemvtencoder.h.

setTileBuffer()

void QgsVectorTileMVTEncoder::setTileBuffer ( int  buffer )

inline

Sets size of the buffer zone around tile edges in integer tile coordinates.

Definition at line 54 of file qgsvectortilemvtencoder.h.

setTransformContext()

void QgsVectorTileMVTEncoder::setTransformContext ( const QgsCoordinateTransformContext &  transformContext )

inline

Sets coordinate transform context for transforms between layers and tile matrix CRS.

Definition at line 57 of file qgsvectortilemvtencoder.h.

tileBuffer()

int QgsVectorTileMVTEncoder::tileBuffer ( ) const

inline

Returns size of the buffer zone around tile edges in integer tile coordinates. The default is 256 (~6%)

Definition at line 52 of file qgsvectortilemvtencoder.h.

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

• /build/qgis-3.18.1+99unstable/src/core/vectortile/qgsvectortilemvtencoder.h
• /build/qgis-3.18.1+99unstable/src/core/vectortile/qgsvectortilemvtencoder.cpp