DataTile~DataTileSource

import DataTileSource from 'ol/source/DataTile.js';

A source for typed array data tiles.

new DataTileSource(options) source/DataTile.js, line 87

Name	Type	Description
`loader`	Loader \| undefined	Data loader. Called with z, x, and y tile coordinates. Returns `data` for a tile or a promise for the same. For loaders that generate images, the promise should not resolve until the image is loaded.
`attributions`	AttributionLike \| undefined	Attributions.
`attributionsCollapsible`	boolean (defaults to true)	Attributions are collapsible.
`maxZoom`	number (defaults to 42)	Optional max zoom level. Not used if `tileGrid` is provided.
`minZoom`	number (defaults to 0)	Optional min zoom level. Not used if `tileGrid` is provided.
`tileSize`	number \| Size (defaults to [256, 256])	The pixel width and height of the source tiles. This may be different than the rendered pixel size if a `tileGrid` is provided.
`gutter`	number (defaults to 0)	The size in pixels of the gutter around data tiles to ignore. This allows artifacts of rendering at tile edges to be ignored. Supported data should be wider and taller than the tile size by a value of `2 x gutter`.
`maxResolution`	number \| undefined	Optional tile grid resolution at level zero. Not used if `tileGrid` is provided.
`projection`	ProjectionLike (defaults to 'EPSG:3857')	Tile projection.
`tileGrid`	TileGrid \| undefined	Tile grid.
`state`	State \| undefined	The source state.
`wrapX`	boolean (defaults to false)	Render tiles beyond the antimeridian.
`transition`	number \| undefined	Transition time when fading in new tiles (in milliseconds).
`bandCount`	number (defaults to 4)	Number of bands represented in the data.
`hasAlpha`	boolean \| undefined	Whether the data includes an alpha band. Used when reprojecting to decide whether a coverage alpha band needs to be appended so areas outside the source footprint render transparent. Defaults to `true` for 2 (luminance alpha) or 4 (RGBA) bands and `false` otherwise.
`interpolate`	boolean (defaults to false)	Use interpolated values when resampling. By default, the nearest neighbor is used when resampling.
`crossOrigin`	CrossOriginAttribute (defaults to 'anonymous')	The crossOrigin property to pass to loaders for image data.
`referrerPolicy`	ReferrerPolicy \| undefined	The `referrerPolicy` property for loaded images.
`key`	string \| undefined	Key for use in caching tiles.
`zDirection`	number \| NearestDirectionFunction (defaults to 0)	Choose whether to use tiles with a higher or lower zoom level when between integer zoom levels. See `getZForResolution`.

Fires:

change (BaseEvent) - Generic change event. Triggered when the revision counter is increased.
error (BaseEvent) - Generic error event. Triggered when an error occurs.
propertychange (ObjectEvent) - Triggered when a property is changed.
tileloadend (TileSourceEvent) - Triggered when a tile finishes loading, either when its data is loaded, or when loading was aborted because the tile is no longer needed.
tileloaderror (TileSourceEvent) - Triggered if tile loading results in an error. Note that this is not the right place to re-fetch tiles. See load for details.
tileloadstart (TileSourceEvent) - Triggered when a tile starts loading.

Subclasses

Extends

TileSource

Methods

changed() inherited Observable.js, line 68

Increases the revision counter and dispatches a 'change' event.

clear() inherited source/Tile.js, line 258

Remove all cached reprojected tiles from the source. The next render cycle will create new tiles.

dispatchEvent(event){boolean | undefined} inherited events/Target.js, line 85

Dispatches an event and calls all listeners listening for events of this type. The event parameter can either be a string or an Object with a type property.

Name	Type	Description
`event`	BaseEvent \| string	Event object.

Returns:

false if anyone called preventDefault on the event object or if any of the listeners returned false.

get(key){*} inherited Object.js, line 136

Gets a value.

Name	Type	Description
`key`	string	Key name.

Returns:

Value.

getAttributions(){Attribution} inherited source/Source.js, line 129

Get the attribution function for the source.

Returns:

Attribution function.

getAttributionsCollapsible(){boolean} inherited source/Source.js, line 137

Returns:

Attributions are collapsible.

getKeys(){Array.<string>} inherited Object.js, line 149

Get a list of object property names.

Returns:

List of property names.

getProjection(){Projection | null} inherited source/Source.js, line 146

Get the projection of the source.

Returns:

Projection.

getProperties(){NoInfer.<Properties>} inherited Object.js, line 158

Get an object of all property names and values.

Returns:

Object.

getRevision(){number} inherited Observable.js, line 79

Get the version number for this object. Each time the object is modified, its version number will be incremented.

Returns:

Revision.

getState(){State} inherited source/Source.js, line 201

Get the state of the source, see State for possible states.

Returns:

State.

getTileGrid(){TileGrid | null} inherited source/Tile.js, line 190

Return the tile grid of the tile source.

Returns:

Tile grid.

on(type, listener){EventsKey | Array<EventsKey>} inherited Observable.js, line 152

Listen for a certain type of event.

Name	Type	Description
`type`	string \| Array.<string>	The event type or array of event types.
`listener`	function	The listener function.

Returns:

Unique key for the listener. If called with an array of event types as the first argument, the return will be an array of keys.

once(type, listener){EventsKey | Array<EventsKey>} inherited Observable.js, line 164

Listen once for a certain type of event.

Name	Type	Description
`type`	string \| Array.<string>	The event type or array of event types.
`listener`	function	The listener function.

Returns:

Unique key for the listener. If called with an array of event types as the first argument, the return will be an array of keys.

refresh() inherited source/Source.js, line 223

Refreshes the source. The source will be cleared, and data from the server will be reloaded.

set(key, value, silent) inherited Object.js, line 218

Sets a value.

Name	Type	Description
`key`	string	Key name.
`value`	*	Value.
`silent`	boolean \| undefined	Update without triggering an event.

setAttributions(attributions) inherited source/Source.js, line 234

Set the attributions of the source.

Name	Type	Description
`attributions`	AttributionLike \| undefined	Attributions. Can be passed as `string`, `Array<string>`, `Attribution`, or `undefined`.

setProperties(values, silent) inherited Object.js, line 238

Sets a collection of key-value pairs. Note that this changes any existing properties and adds new ones (it does not remove any existing properties).

Name	Type	Description
`values`	Partial.<NoInfer.<Properties>>	Values.
`silent`	boolean \| undefined	Update without triggering an event.

setTileGridForProjection(projection, tilegrid) source/DataTile.js, line 484

Sets the tile grid to use when reprojecting the tiles to the given projection instead of the default tile grid for the projection.

This can be useful when the default tile grid cannot be created (e.g. projection has no extent defined) or for optimization reasons (custom tile size, resolutions, ...).

Name	Type	Description
`projection`	ProjectionLike	Projection.
`tilegrid`	TileGrid	Tile grid to use for the projection.

un(type, listener) inherited Observable.js, line 173

Unlisten for a certain type of event.

Name	Type	Description
`type`	string \| Array.<string>	The event type or array of event types.
`listener`	function	The listener function.

unset(key, silent) inherited Object.js, line 262

Unsets a property.

Name	Type	Description
`key`	string	Key name.
`silent`	boolean \| undefined	Unset without triggering an event.