Detailed Description

Class that encapsulates the information contained within a GeoPackage Tile Pyramid Level.

A pyramid level consists of a sparse grid of tiles. Each tile may or may not contain any data.

The column and row indexes used by the pyramid level are relative to the bottom-left most tile.

This class represents a single zoom level of the pyramid, defined within a geopackage tiles table.

Public Member Functions
bool	getTileRawData (int tileColumn, int tileRow, unsigned char *buffer, unsigned int size) const

unsigned int	getTileRawDataSize (int tileColumn, int tileRow) const

bool	hasData () const

int	numberOfTileColumns () const

int	numberOfTileRows () const

double	pixelXSize () const

double	pixelYSize () const

int	tileHeight () const

int	tileWidth () const

int	zoomLevel () const

Member Function Documentation

◆ getTileRawData()

bool TSLGPkgPyramidLevel::getTileRawData	(	int	tileColumn,
		int	tileRow,
		unsigned char *	buffer,
		unsigned int	size ) const

Query the raw SQLite BLOB data for the specified tile.

The provided buffer must be large enough to hold the data. The size of the BLOB can be queried with the getTileRawDataSize method.

Parameters

tileColumn	The column of the tile to query.
tileRow	The row of the tile to query.
buffer	The buffer to store the queried BLOB data in.
size	The size of the provided buffer.

Returns: true if the data was queried, or false if an error occurred.

◆ getTileRawDataSize()

unsigned int TSLGPkgPyramidLevel::getTileRawDataSize	(	int	tileColumn,
		int	tileRow ) const

Query the size of the raw SQLite BLOB, for the specified tile.

Parameters

tileColumn	The column of the tile to query.
tileRow	The row of the tile to query.

Returns: the size of the raw SQLite BLOB, for the specified tile.

◆ hasData()

bool TSLGPkgPyramidLevel::hasData ( ) const

Queries whether this pyramid level contains any tile data.

Each tile within a pyramid level may not contain any data, and a pyramid level may be completely empty.

Returns true if this pyramid level contains any data, or false otherwise.

◆ numberOfTileColumns()

int TSLGPkgPyramidLevel::numberOfTileColumns ( ) const

Returns the number of columns (>=1) in the tile matrix at this zoom level.

◆ numberOfTileRows()

int TSLGPkgPyramidLevel::numberOfTileRows ( ) const

Returns the number of rows (>=1) in the tile matrix at this zoom level.

◆ pixelXSize()

double TSLGPkgPyramidLevel::pixelXSize ( ) const

Query the width of a pixel, for this pyramid level.

The units of this size are specified by the coordinate system of the tile table, or metres if the coordinate system is undefined.

Returns the width of each pixel.

◆ pixelYSize()

double TSLGPkgPyramidLevel::pixelYSize ( ) const

Query the height of a pixel, for this pyramid level.

The units of this size are specified by the coordinate system of the tile table, or metres if the coordinate system is undefined.

Returns the height of each pixel.

◆ tileHeight()

int TSLGPkgPyramidLevel::tileHeight ( ) const

Returns the Tile Height in pixels (>=1) for this Zoom Level.

◆ tileWidth()

int TSLGPkgPyramidLevel::tileWidth ( ) const

Returns the Tile Width in pixels (>=1) for this Zoom Level.

◆ zoomLevel()

int TSLGPkgPyramidLevel::zoomLevel ( ) const

Returns the Zoom Level within the Tile Pyramid.