Class: Layer

Subclasses

• ol.layer.Image
• ol.layer.Tile
• ol.layer.Vector

Extends

• ol.layer.Base

Observable Properties

Name	Type	Settable	ol.ObjectEvent type	Description
brightness	number	yes	change:brightness	The brightness of the layer.
contrast	number	yes	change:contrast	The contrast of the layer.
extent	ol.Extent | undefined	yes	change:extent	The layer extent.
hue	number	yes	change:hue	The hue of the layer.
maxResolution	number	yes	change:maxresolution	The maximum resolution of the layer.
minResolution	number	yes	change:minresolution	The minimum resolution of the layer.
opacity	number	yes	change:opacity	The opacity of the layer.
saturation	number	yes	change:saturation	The saturation of the layer.
source	ol.source.Source	yes	change:source	The layer source (or null if not yet set).
visible	boolean	yes	change:visible	The visibility of the layer.

Methods

changed() inherited experimental

src/ol/observable.js, line 52

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

Fires:

• change experimental

get(key){*} inherited

src/ol/object.js, line 150

Gets a value.

Name	Type	Description
key	string	Key name.

Returns:

Value.

getBrightness(){number} inherited experimental

src/ol/layer/layerbase.js, line 95

Return the brightness of the layer.

Returns:

The brightness of the layer.

getContrast(){number} inherited experimental

src/ol/layer/layerbase.js, line 106

Return the contrast of the layer.

Returns:

The contrast of the layer.

getExtent(){ol.Extent|undefined} inherited

src/ol/layer/layerbase.js, line 175

Return the extent of the layer or undefined if it will be visible regardless of extent.

Returns:

The layer extent.

getHue(){number} inherited experimental

src/ol/layer/layerbase.js, line 117

Return the hue of the layer.

Returns:

The hue of the layer.

getKeys(){Array.<string>} inherited

src/ol/object.js, line 164

Get a list of object property names.

Returns:

List of property names.

getMaxResolution(){number} inherited

src/ol/layer/layerbase.js, line 187

Return the maximum resolution of the layer.

Returns:

The maximum resolution of the layer.

getMinResolution(){number} inherited

src/ol/layer/layerbase.js, line 199

Return the minimum resolution of the layer.

Returns:

The minimum resolution of the layer.

getOpacity(){number} inherited

src/ol/layer/layerbase.js, line 211

Return the opacity of the layer (between 0 and 1).

Returns:

The opacity of the layer.

getProperties(){Object.<string, *>} inherited

src/ol/object.js, line 174

Get an object of all property names and values.

Returns:

Object.

getRevision(){number} inherited experimental

src/ol/observable.js, line 62

Returns:

Revision.

getSaturation(){number} inherited experimental

src/ol/layer/layerbase.js, line 222

Return the saturation of the layer.

Returns:

The saturation of the layer.

getSource(){ol.source.Source}

src/ol/layer/layer.js, line 91

Get the layer source.

Returns:

The layer source (or null if not yet set).

getVisible(){boolean} inherited

src/ol/layer/layerbase.js, line 239

Return the visibility of the layer (true or false).

Returns:

The visibility of the layer.

on(type, listener, opt_this){goog.events.Key} inherited

src/ol/observable.js, line 75

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.
this	Object	The object to use as this in listener.

Returns:

Unique key for the listener.

once(type, listener, opt_this){goog.events.Key} inherited

src/ol/observable.js, line 88

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.
this	Object	The object to use as this in listener.

Returns:

Unique key for the listener.

set(key, value) inherited

src/ol/object.js, line 203

Sets a value.

Name	Type	Description
key	string	Key name.
value	*	Value.

setBrightness(brightness) inherited experimental

src/ol/layer/layerbase.js, line 266

Adjust the layer brightness. A value of -1 will render the layer completely black. A value of 0 will leave the brightness unchanged. A value of 1 will render the layer completely white. Other values are linear multipliers on the effect (values are clamped between -1 and 1).

The filter effects draft [1] says the brightness function is supposed to render 0 black, 1 unchanged, and all other values as a linear multiplier.

The current WebKit implementation clamps values between -1 (black) and 1 (white) [2]. There is a bug open to change the filter effect spec [3].

TODO: revisit this if the spec is still unmodified before we release

[1] https://dvcs.w3.org/hg/FXTF/raw-file/tip/filters/index.html [2] https://github.com/WebKit/webkit/commit/8f4765e569 [3] https://www.w3.org/Bugs/Public/show_bug.cgi?id=15647

Name	Type	Description
brightness	number	The brightness of the layer.

setContrast(contrast) inherited experimental

src/ol/layer/layerbase.js, line 280

Adjust the layer contrast. A value of 0 will render the layer completely grey. A value of 1 will leave the contrast unchanged. Other values are linear multipliers on the effect (and values over 1 are permitted).

Name	Type	Description
contrast	number	The contrast of the layer.

setExtent(extent) inherited

src/ol/layer/layerbase.js, line 304

Set the extent at which the layer is visible. If undefined, the layer will be visible at all extents.

Name	Type	Description
extent	ol.Extent | undefined	The extent of the layer.

setHue(hue) inherited experimental

src/ol/layer/layerbase.js, line 292

Apply a hue-rotation to the layer. A value of 0 will leave the hue unchanged. Other values are radians around the color circle.

Name	Type	Description
hue	number	The hue of the layer.

setMaxResolution(maxResolution) inherited

src/ol/layer/layerbase.js, line 315

Set the maximum resolution at which the layer is visible.

Name	Type	Description
maxResolution	number	The maximum resolution of the layer.

setMinResolution(minResolution) inherited

src/ol/layer/layerbase.js, line 326

Set the minimum resolution at which the layer is visible.

Name	Type	Description
minResolution	number	The minimum resolution of the layer.

setOpacity(opacity) inherited

src/ol/layer/layerbase.js, line 337

Set the opacity of the layer, allowed values range from 0 to 1.

Name	Type	Description
opacity	number	The opacity of the layer.

setProperties(values) inherited

src/ol/object.js, line 216

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	Object.<string, *>	Values.

setSaturation(saturation) inherited experimental

src/ol/layer/layerbase.js, line 352

Adjust layer saturation. A value of 0 will render the layer completely unsaturated. A value of 1 will leave the saturation unchanged. Other values are linear multipliers of the effect (and values over 1 are permitted).

Name	Type	Description
saturation	number	The saturation of the layer.

setSource(source)

src/ol/layer/layer.js, line 138

Set the layer source.

Name	Type	Description
source	ol.source.Source	The layer source.

setVisible(visible) inherited

src/ol/layer/layerbase.js, line 363

Set the visibility of the layer (true or false).

Name	Type	Description
visible	boolean	The visibility of the layer.

un(type, listener, opt_this) inherited

src/ol/observable.js, line 101

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.
this	Object	The object which was used as this by the listener.

unByKey(key) inherited

src/ol/observable.js, line 114

Removes an event listener using the key returned by on() or once(). Note that using the ol.Observable.unByKey static function is to be preferred.

Name	Type	Description
key	goog.events.Key	The key returned by on() or once().

unset(key) inherited

src/ol/object.js, line 229

Unsets a property.

Name	Type	Description
key	string	Key name.