IlvShapeSpatialIndex Class Reference

An IlvShapeSpatialIndex is used to store and retrieve tile information for a given Shapefile. More...

#include <ilviews/maps/format/shapefile/spindex.h>

Public Member Functions
	IlvShapeSpatialIndex (IlInt columNum, IlInt rowNum, IlvCoordinate *origin, IlDouble tileWidth, IlDouble tileHeight)
	Constructs an empty spatial index with the specified parameters. More...
	IlvShapeSpatialIndex (const char *indexFilename)
	Constructs a spatial index whose values are read from the specified file. More...
IlBoolean	add (IlInt c, IlInt r, IlInt id)
	Adds the object whose ID is specified in the spatial index, at the specified position. More...
IlInt	getColumnCount () const
	Returns the number of tile columns covered by this index. More...
IlvMapsError	getIdArray (IlInt column, IlInt row, IlInt *&ret, IlUInt &size)
	Returns an array containing the IDs of all the shape features contained within the specified tile. More...
IlvMapsError	getInitStatus () const
	Returns the status. More...
IlvCoordinate *	getOrigin () const
	Returns the origin of the tile grid. More...
IlInt	getRowCount () const
	Returns the number of tile rows covered by this index. More...
IlDouble	getTileHeight () const
	Returns the height of one tile. More...
IlDouble	getTileWidth () const
	Returns the width of one tile. More...
IlvMapsError	save (const char *filename)
	Writes this spatial index to the specified file. More...

Detailed Description

An IlvShapeSpatialIndex is used to store and retrieve tile information for a given Shapefile.

Library: ilvmaps

When an IlvShapeSpatialIndex is written to a file, it uses a format that is internal to Rogue Wave Views Maps.

Constructor & Destructor Documentation

IlvShapeSpatialIndex::IlvShapeSpatialIndex	(	IlInt	columNum,
		IlInt	rowNum,
		IlvCoordinate *	origin,
		IlDouble	tileWidth,
		IlDouble	tileHeight
	)

Constructs an empty spatial index with the specified parameters.

Parameters

columNum	The number of columns.
rowNum	The number of rows.
origin	The origin of the grid defined by this index.
tileWidth	The width of one tile, in manager coordinates.
tileHeight	The height of one tile, in manager coordinates.

IlvShapeSpatialIndex::IlvShapeSpatialIndex

(

const char *

indexFilename

)

Constructs a spatial index whose values are read from the specified file.

When a spatial index is created with this constructor, it is read-only, meaning that the add() method does not work.
The specified file must have been written using the save() method of an IlvShapeFileIndex.

Parameters

indexFilename

The name of the spatial index file.

Member Function Documentation

IlBoolean IlvShapeSpatialIndex::add	(	IlInt	c,
		IlInt	r,
		IlInt	id
	)

Adds the object whose ID is specified in the spatial index, at the specified position.

Parameters

c	The column position.
r	The row position.
id	The ID to add.

Returns

IlFalse if the IlvShapeSpatialIndex is read only, IlTrue otherwise.

IlInt IlvShapeSpatialIndex::getColumnCount

(

)

const

Returns the number of tile columns covered by this index.

Returns

The number of tile columns.

IlvMapsError IlvShapeSpatialIndex::getIdArray	(	IlInt	column,
		IlInt	row,
		IlInt *&	ret,
		IlUInt &	size
	)

Returns an array containing the IDs of all the shape features contained within the specified tile.

IDs are coded as IlInt type and can be accessed using IlvShapeSHPReader::getFeatureAt().

Parameters

column	The column of the tile.
row	The row of the tile.
ret	A returned array of IlInt containing the IDs of all the shape features contained within the specified tile. This array, if nonnull, must be deleted by the caller by using the delete[] operator.
size	The size of the returned array of IDs.

Returns

An IlvMapsError if the array cannot be read, IlvMaps::NoError() otherwise.

IlvMapsError IlvShapeSpatialIndex::getInitStatus

(

)

const

Returns the status.

This status is set when constructing a IlvShapeSpatialIndex with a file name.

IlvCoordinate* IlvShapeSpatialIndex::getOrigin

(

)

const

Returns the origin of the tile grid.

Returns

The origin of the tile grid.

IlInt IlvShapeSpatialIndex::getRowCount

(

)

const

Returns the number of tile rows covered by this index.

Returns

The number of tile rows.

IlDouble IlvShapeSpatialIndex::getTileHeight

(

)

const

Returns the height of one tile.

Returns

The tile height.

IlDouble IlvShapeSpatialIndex::getTileWidth

(

)

const

Returns the width of one tile.

Returns

The tile width.

IlvMapsError IlvShapeSpatialIndex::save

(

const char *

filename

)

Writes this spatial index to the specified file.

Parameters

filename

The name of the output file to write this spatial index to.