A tiled layer is an IlvManagerLayer object for loading large sets of data, for example, large maps. More...

#include <ilviews/maps/tiling/tiledlayer.h>

Inheritance diagram for IlvTiledLayer:

Public Member Functions
	IlvTiledLayer (const IlvRect &tileOrigin, IlvTileCache *cache=0, IlBoolean startEnabled=IlTrue, IlUShort maxInList=IlvMaxObjectsInList, IlUShort maxInNode=IlvMaxObjectsInList)
	Creates an instance of tiled layer. More...

virtual void	draw (IlvPort port, const IlvTransformer t=0, const IlvRegion region=0, const IlvRegion clip=0) const
	Draws the content of the layer. More...

void	fitTransformerToTile (IlvView *view, IlInt row, IlInt column) const
	Sets the transformer of `view` so that the specified tile is fully visible. More...

IlvView *	getDebugView () const
	Returns the debug view of the layer if it has been specified. More...

virtual IlvMapsError	getInitStatus () const
	Returns the initialization status of this tiled layer. More...

const IlvRect &	getSize () const
	Returns the size of the layer if it has been specified. More...

IlvTileController *	getTileController () const
	Returns the tile controller of the layer. More...

IlvTileLoader *	getTileLoader () const
	Returns the tile loader of the layer. More...

IlBoolean	isDebugDrawingOnTop ()
	Specifies whether the debug graphics are to be drawn above or under the graphics. More...

void	setDebugDrawingOnTop (IlBoolean set)
	Tells the debug view if it should draw the drawing on the top. More...

void	setDebugView (IlvView view, IlvColor borderColor=0, IlvColor lockedTilesColor=0, IlvColor cachedTilesColor=0)
	Sets a debug view in which the layer will draw its tiles. More...

void	setSize (const IlvRect &rect)
	Specifies the area in which the tiles are contained. More...

void	setTileLoader (IlvTileLoader *tileLoader)
	Sets the tile loader of the layer. More...

void	start ()
	Starts the load-on-demand process.

Static Public Member Functions
static IlvTiledLayer *	GetFirstTiledLayer (IlvManager *manager)
	Returns the first `IlvTiledLayer` of the manager or a null pointer if the manager does not contain any `IlvTiledLayer`. More...

static void	StartAll (IlvManager *manager)
	Starts all the tiled layers of the specified manager. More...

Protected Member Functions
virtual void	setInitStatus (IlvMapsError status)
	Sets the initialization status of this layer. More...

Detailed Description

A tiled layer is an IlvManagerLayer object for loading large sets of data, for example, large maps.

Library: ilvmaps

It is divided into a number of identical rectangular areas called tiles, and provides a notification mechanism to load only the graphic objects that are required by the application, because a tile is visible in one of the views of the manager or because it has been explicitly required by the application. The tiles are managed by an IlvTileController.

This image shows an IlvTiledLayer in debug mode.

The tile limits are drawn in green.
The tiles that have already been loaded but that are no longer locked appear in yellow. These tiles are "cached" and can be released by the cache if memory is required to load new tiles.
The tiles that have been loaded and that are locked appear in blue.

An IlvTiledLayer is associated to three important objects:

An IlvTileController, which manages the tile events.
An IlvTileLoader, which loads the tiles from a data source.
An IlvTileCache, which manages the cache and deletes the unused tiles.

When an IlvTiledLayer is saved into an .ilv file, it does not save the graphic objects it contains. It saves its tiling parameters (loader, cache, tile controller).

Constructor & Destructor Documentation

IlvTiledLayer::IlvTiledLayer	(	const IlvRect &	tileOrigin,
		IlvTileCache *	cache = `0`,
		IlBoolean	startEnabled = `IlTrue`,
		IlUShort	maxInList = `IlvMaxObjectsInList`,
		IlUShort	maxInNode = `IlvMaxObjectsInList`
	)

Creates an instance of tiled layer.

Parameters

tileOrigin	The position of the tile of row 0 and column 0.
cache	The cache that will monitor the release operations of the cached tiles. If this optional parameter is absent or if it has a null value, the default cache will be used.
startEnabled	Specifies if the load-on-demand process is ready to start.
maxInList	Specifies the number of object that will trigger a quadtree division. A large number will deactivate the spatial indexation.
maxInNode	Specifies the maximum number of quadtree subdivisions.

See also: IlvDefaultTileCache::GetDefaultCache; IlvTileController::enableStart

Member Function Documentation

virtual void IlvTiledLayer::draw	(	IlvPort *	port,
		const IlvTransformer *	t = `0`,
		const IlvRegion *	region = `0`,
		const IlvRegion *	clip = `0`
	)		const

virtual

Draws the content of the layer.

Parameters

port	The port in which the layer content will be drawn.
t	The transformer. If set to null, the layer is drawn using the manager coordinate system.
region	The region to be drawn.
clip	The clip.

void IlvTiledLayer::fitTransformerToTile	(	IlvView *	view,
		IlInt	row,
		IlInt	column
	)		const

Sets the transformer of view so that the specified tile is fully visible.

This function should not be called if the layer has not been added to an IlvManager. In this case, the function does nothing.

Parameters

view	The view.
row	The row of the tile.
column	The column of the tile.

IlvView* IlvTiledLayer::getDebugView ( ) const

Returns the debug view of the layer if it has been specified.

Returns: The debug IlvView.

static IlvTiledLayer* IlvTiledLayer::GetFirstTiledLayer ( IlvManager * manager )

static

Returns the first IlvTiledLayer of the manager or a null pointer if the manager does not contain any IlvTiledLayer.

Parameters

manager The IlvManager.

Returns: The first IlvTiledLayer of this manager.

virtual IlvMapsError IlvTiledLayer::getInitStatus ( ) const

virtual

Returns the initialization status of this tiled layer.

Returns: IlvMaps::NoError() if this tiled layer has been initialized successfully, an error otherwise.

Reimplemented in IlvSDOLayer.

const IlvRect& IlvTiledLayer::getSize ( ) const

Returns the size of the layer if it has been specified.

This method is a shortcut for getTileController->getSize()

Returns: An IlvRect object containing the size of the layer.

See also: IlvTiledLayer::setSize

IlvTileController* IlvTiledLayer::getTileController ( ) const

Returns the tile controller of the layer.

Returns: The IlvTileControler object of the layer.

IlvTileLoader* IlvTiledLayer::getTileLoader ( ) const

Returns the tile loader of the layer.

This method is a shortcut for getTileController->getTileLoader().

Returns: The IlvTileLoader of this layer.

IlBoolean IlvTiledLayer::isDebugDrawingOnTop ( )

Specifies whether the debug graphics are to be drawn above or under the graphics.

Returns: IlTrue if the graphics are drawn on top of the graphics, IlFalse otherwise.

void IlvTiledLayer::setDebugDrawingOnTop ( IlBoolean set )

Tells the debug view if it should draw the drawing on the top.

Parameters

set	If `IlTrue`, the debug graphics are drawn on top of the objects. If `IlFalse`, the debug graphics are drawn under the graphics.

void IlvTiledLayer::setDebugView	(	IlvView *	view,
		IlvColor *	borderColor = `0`,
		IlvColor *	lockedTilesColor = `0`,
		IlvColor *	cachedTilesColor = `0`
	)

Sets a debug view in which the layer will draw its tiles.

Parameters

view	The debug view (it must be attached to the manager of the layer). If this argument is `null`, then no debug view is used by the layer and the previous debug view is considered as a normal view.
borderColor	The color used to draw the tile border. If the optional parameter is not specified, the borders are drawn in green.
lockedTilesColor	The color used to draw the locked tiles. If the optional parameter is not specified, the borders are drawn in blue.
cachedTilesColor	The color used to draw the cached tiles. If the optional parameter is not specified, the borders are drawn in yellow.

virtual void IlvTiledLayer::setInitStatus ( IlvMapsError status )

protectedvirtual

Sets the initialization status of this layer.

Subclasses of IlvTiledLayer should call this method when their initialization is not successful.

Parameters

status The initialization status.

void IlvTiledLayer::setSize ( const IlvRect & rect )

Specifies the area in which the tiles are contained.

If the rect parameter has a width and height of 0 there is no limit to the tiling grid. This method is a shortcut for getTileController->setSize().

Parameters

rect	The area in which the tiles are contained.

void IlvTiledLayer::setTileLoader ( IlvTileLoader * tileLoader )

Sets the tile loader of the layer.

This method is a shortcut for getTileController->setTileLoader().

Parameters

tileLoader The new IlvTilLoader for this layer.

static void IlvTiledLayer::StartAll ( IlvManager * manager )

static

Starts all the tiled layers of the specified manager.

Parameters

manager The IlvManager.

See also: start.

Public Member Functions

Static Public Member Functions

Protected Member Functions

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation