Meta Layers

Allows you to create additional layers of meta information and add them to the map.

DG.Meta.layer

Inherits from DG.Layer.

Creation

Factory	Usage	Description
DG.Meta.layer( <String> source, <DG.Meta.layer options> options? )	DG.Meta.layer(…)	Creates additional layer with meta-information. Takes the source URL as a parameter with which the tiles of an additional layer are available.

Options

Option	Type	Default	Description
tileSize	Number	256	The tile size (width and height in pixels, it is assumed that the tile is square).
minZoom	Number	0	The minimum zoom level.
maxZoom	Number	18	The maximum zoom level.
zoomOffset	Number	0	Value which will shift the zoom level in the tile's address.
eventBubbling	String	'transparent'||'layer'	The way in which meta-layer handles events. Accepts values layer or transparent (default): transparent — meta-layer receives all of the events and carry them to the map layer — meta-layer receives all of the events and stops them after processing

Events

You can subscribe to the following events using these methods.

Event	Data	Description
mouseover	MetaEvent	Called when you hover the mouse over the additional layer object.
mouseout	MetaEvent	Called when the mouse cursor leaves the bounds of an additional layer object.
mousemove	MetaEvent	Called when the mouse cursor moves over an additional layer object.
click	MetaEvent	Called when the mouse click in the additional layer.
dblclick	MetaEvent	Called when the mouse double-click in the additional layer.
mousedown	MetaEvent	Called when the mouse button is pressed while the cursor is over the additional layer.
contextmenu	MetaEvent	Called when you click the right mouse button in the additional layer.

Methods

Method	Returns	Description
getOrigin()	Object	Returns origin-instance of additional layer.

DG.Meta.origin

Works with the meta data of a layer, inherits from DG.Class.

Creation

Factory	Usage	Description
DG.Meta.origin( <String> source, <DG.Meta.layer options> options? )	DG.Meta.origin(…)	Creates an instance for work with the meta layer data. Takes the source URL as a parameter with which the tiles of an additional layer are available.

Options

Option	Type	Default	Description
subdomains	String или String[]	'0123'	Tile service subdomains. Can be sent as one string (where each letter — is a subdomain name) or as an array of strings.
dataFilter	Function	null	Optional parameter, which takes a function to filter or convert the meta data received from the server.

Methods

Method	Returns	Description
getTileData( <Object> coord)	Object	Returns the metadata of the meta layer for the specified tile.
setTileData( <String>/<Object> coord, <Object> data)	this	Assigns data for the tile with the coord key.
flush()	this	Clear cached data for all tiles.
setURL( <String> url, <Boolean> flush?)	this	Sets the url used to get the meta data. If the parameter flush=true, the cached data will be cleared.
getTileKey( <Object> coord)	String	Returns the key of the tile as a string.