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