OpenLayers

Class: Cluster

ol.source.Cluster

Layer source to cluster vector data. Works out of the box with point geometries. For other geometry types, or if not all geometries should be considered for clustering, a custom geometryFunction can be defined.

new ol.source.Cluster(options)

src/ol/source/cluster.js, line 27
Name Type Description
options

Constructor options.

Name Type Description
attributions ol.AttributionLike | undefined

Attributions.
distance number | undefined

Minimum distance in pixels between clusters. Default is 20.
extent ol.Extent | undefined

Extent.
geometryFunction undefined | function

Function that takes an ol.Feature as argument and returns an ol.geom.Point as cluster calculation point for the feature. When a feature should not be considered for clustering, the function should return null. The default, which works when the underyling source contains point features only, is

function(feature) {
  return feature.getGeometry();
}

See ol.geom.Polygon#getInteriorPoint for a way to get a cluster calculation point for polygons.
format ol.format.Feature | undefined

Format.
logo string | undefined

Logo.
projection ol.ProjectionLike

Projection.
source ol.source.Vector

Source. Required.
wrapX boolean | undefined

WrapX. Default is true
Fires:

Extends

Methods

addFeature(feature) inherited

src/ol/source/vector.js, line 166

Add a single feature to the source. If you want to add a batch of features at once, call source.addFeatures() instead. A feature will not be added to the source if feature with the same id is already there. The reason for this behavior is to avoid feature duplication when using bbox or tile loading strategies.

Name Type Description
feature ol.Feature

Feature to add.

addFeatures(features) inherited

src/ol/source/vector.js, line 246

Add a batch of features to the source.

Name Type Description
features Array.<ol.Feature>

Features to add.

changed() inherited

src/ol/observable.js, line 58

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

clear(opt_fast) inherited

src/ol/source/vector.js, line 344

Remove all features from the source.

Name Type Description
fast boolean

Skip dispatching of removefeature events.

dispatchEvent(event) inherited

src/ol/observable.js, line 75

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 Object | ol.events.Event | string

Event object.

forEachFeature(callback, opt_this){S|undefined} inherited

src/ol/source/vector.js, line 391

Iterate through all features on the source, calling the provided callback with each one. If the callback returns any "truthy" value, iteration will stop and the function will return the same value.

Name Type Description
callback function

Called with each feature on the source. Return a truthy value to stop iteration.
this T

The object to use as this in the callback.
Returns:
The return value from the last call to the callback.

forEachFeatureInExtent(extent, callback, opt_this){S|undefined} inherited

src/ol/source/vector.js, line 447

Iterate through all features whose bounding box intersects the provided extent (note that the feature's geometry may not intersect the extent), calling the callback with each feature. If the callback returns a "truthy" value, iteration will stop and the function will return the same value.

If you are interested in features whose geometry intersects an extent, call the source.forEachFeatureIntersectingExtent() method instead.

When useSpatialIndex is set to false, this method will loop through all features, equivalent to ol.source.Vector#forEachFeature.

Name Type Description
extent ol.Extent

Extent.
callback function

Called with each feature whose bounding box intersects the provided extent.
this T

The object to use as this in the callback.
Returns:
The return value from the last call to the callback.

forEachFeatureIntersectingExtent(extent, callback, opt_this){S|undefined} inherited

src/ol/source/vector.js, line 473

Iterate through all features whose geometry intersects the provided extent, calling the callback with each feature. If the callback returns a "truthy" value, iteration will stop and the function will return the same value.

If you only want to test for bounding box intersection, call the source.forEachFeatureInExtent() method instead.

Name Type Description
extent ol.Extent

Extent.
callback function

Called with each feature whose geometry intersects the provided extent.
this T

The object to use as this in the callback.
Returns:
The return value from the last call to the callback.

get(key){*} inherited

src/ol/object.js, line 101

Gets a value.

Name Type Description
key string

Key name.
Returns:
Value.

getAttributions(){Array.<ol.Attribution>} inherited

src/ol/source/source.js, line 113

Get the attributions of the source.

Returns:
Attributions.

getClosestFeatureToCoordinate(coordinate, opt_filter){ol.Feature} inherited

src/ol/source/vector.js, line 567

Get the closest feature to the provided coordinate.

This method is not available when the source is configured with useSpatialIndex set to false.

Name Type Description
coordinate ol.Coordinate

Coordinate.
filter function

Feature filter function. The filter function will receive one argument, the feature and it should return a boolean value. By default, no filtering is made.
Returns:
Closest feature.

getDistance(){number}

src/ol/source/cluster.js, line 83

Get the distance in pixels between clusters.

Returns:
Distance.

getExtent(opt_extent){ol.Extent} inherited

src/ol/source/vector.js, line 620

Get the extent of the features currently in the source.

This method is not available when the source is configured with useSpatialIndex set to false.

Name Type Description
extent ol.Extent

Destination extent. If provided, no new extent will be created. Instead, that extent's coordinates will be overwritten.
Returns:
Extent.

getFeatureById(id){ol.Feature} inherited

src/ol/source/vector.js, line 634

Get a feature by its identifier (the value returned by feature.getId()). Note that the index treats string and numeric identifiers as the same. So source.getFeatureById(2) will return a feature with id '2' or 2.

Name Type Description
id string | number

Feature identifier.
Returns:
The feature (or null if not found).

getFeatures(){Array.<ol.Feature>} inherited

src/ol/source/vector.js, line 509

Get all features on the source in random order.

Returns:
Features.

getFeaturesAtCoordinate(coordinate){Array.<ol.Feature>} inherited

src/ol/source/vector.js, line 530

Get all features whose geometry intersects the provided coordinate.

Name Type Description
coordinate ol.Coordinate

Coordinate.
Returns:
Features.

getFeaturesCollection(){ol.Collection.<ol.Feature>} inherited

src/ol/source/vector.js, line 499

Get the features collection associated with this source. Will be null unless the source was configured with useSpatialIndex set to false, or with an ol.Collection as features.

Returns:
The collection of features.

getFeaturesInExtent(extent){Array.<ol.Feature>} inherited

src/ol/source/vector.js, line 550

Get all features in the provided extent. Note that this returns an array of all features intersecting the given extent in random order (so it may include features whose geometries do not intersect the extent).

This method is not available when the source is configured with useSpatialIndex set to false.

Name Type Description
extent ol.Extent

Extent.
Returns:
Features.

getFormat(){ol.format.Feature|undefined} inherited

src/ol/source/vector.js, line 646

Get the format associated with this source.

Returns:
The feature format.

getKeys(){Array.<string>} inherited

src/ol/object.js, line 115

Get a list of object property names.

Returns:
List of property names.

getLogo(){string|olx.LogoOptions|undefined} inherited

src/ol/source/source.js, line 123

Get the logo of the source.

Returns:
Logo.

getProjection(){ol.proj.Projection} inherited

src/ol/source/source.js, line 133

Get the projection of the source.

Returns:
Projection.

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

src/ol/object.js, line 125

Get an object of all property names and values.

Returns:
Object.

getRevision(){number} inherited

src/ol/observable.js, line 84

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

Returns:
Revision.

getSource(){ol.source.Vector}

src/ol/source/cluster.js, line 93

Get a reference to the wrapped source.

Returns:
Source.

getState(){ol.source.State} inherited

src/ol/source/source.js, line 150

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

Returns:
State.

getUrl(){string|ol.FeatureUrlFunction|undefined} inherited

src/ol/source/vector.js, line 671

Get the url associated with this source.

Returns:
The url.

on(type, listener, opt_this){ol.EventsKey|Array.<ol.EventsKey>} inherited

src/ol/observable.js, line 99

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

once(type, listener, opt_this){ol.EventsKey|Array.<ol.EventsKey>} inherited

src/ol/observable.js, line 124

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

refresh() inherited

src/ol/source/source.js, line 167

Refreshes the source and finally dispatches a 'change' event.

removeFeature(feature) inherited

src/ol/source/vector.js, line 772

Remove a single feature from the source. If you want to remove all features at once, use the source.clear() method instead.

Name Type Description
feature ol.Feature

Feature to remove.

set(key, value, opt_silent) inherited

src/ol/object.js, line 150

Sets a value.

Name Type Description
key string

Key name.
value *

Value.
silent boolean

Update without triggering an event.

setAttributions(attributions) inherited

src/ol/source/source.js, line 179

Set the attributions of the source.

Name Type Description
attributions ol.AttributionLike | undefined

Attributions. Can be passed as string, Array<string>, ol.Attribution, Array<ol.Attribution> or undefined.

setDistance(distance)

src/ol/source/cluster.js, line 118

Set the distance in pixels between clusters.

Name Type Description
distance number

The distance in pixels.

setProperties(values, opt_silent) inherited

src/ol/object.js, line 170

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.
silent boolean

Update without triggering an event.

un(type, listener, opt_this) inherited

src/ol/observable.js, line 147

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.

unset(key, opt_silent) inherited

src/ol/object.js, line 184

Unsets a property.

Name Type Description
key string

Key name.
silent boolean

Unset without triggering an event.