Class: Snap

ol/interaction/Snap~Snap


import Snap from 'ol/interaction/Snap';

Handles snapping of vector features while modifying or drawing them. The features can come from a module:ol/source/Vector or module:ol/Collection~Collection Any interaction object that allows the user to interact with the features using the mouse can benefit from the snapping, as long as it is added before.

The snap interaction modifies map browser event coordinate and pixel properties to force the snap to occur to any interaction that them.

Example:

import Snap from 'ol/interaction/Snap';

const snap = new Snap({
  source: source
});

map.addInteraction(snap);

new Snap(opt_options)

interaction/Snap.js, line 87
Name Type Description
options

Options.

Name Type Description
features module:ol/Collection~Collection.<module:ol/Feature~Feature>

Snap to these features. Either this option or source should be provided.

edge boolean (defaults to true)

Snap to edges.

vertex boolean (defaults to true)

Snap to vertices.

pixelTolerance number (defaults to 10)

Pixel tolerance for considering the pointer close enough to a segment or vertex for snapping.

source module:ol/source/Vector~VectorSource

Snap to features from this source. Either this option or features should be provided

Fires:

Extends

Observable Properties

Name Type Settable ol/Object.ObjectEvent type Description
active boolean yes change:active

true if the interaction is active, false otherwise.

Methods

addFeature(feature, opt_listen)

interaction/Snap.js, line 195

Add a feature to the collection of features that we may snap to.

Name Type Description
feature module:ol/Feature~Feature

Feature.

listen boolean

Whether to listen to the feature change or not Defaults to true.

changed() inherited

Observable.js, line 36

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

dispatchEvent(event){boolean|undefined} inherited

events/Target.js, line 96

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 | module:ol/events/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 119

Gets a value.

Name Type Description
key string

Key name.

Returns:
Value.

getActive(){boolean} inherited

interaction/Interaction.js, line 60

Return whether the interaction is currently active.

Returns:
true if the interaction is active, false otherwise.

getKeys(){Array.<string>} inherited

Object.js, line 132

Get a list of object property names.

Returns:
List of property names.

getMap(){module:ol/PluggableMap~PluggableMap} inherited

interaction/Interaction.js, line 69

Get the map associated with this interaction.

Returns:
Map.

getPointerCount(){number} inherited

interaction/Pointer.js, line 104

Returns the current number of pointers involved in the interaction, e.g. 2 when two fingers are used.

Returns:
The number of pointers.

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

Object.js, line 141

Get an object of all property names and values.

Returns:
Object.

getRevision(){number} inherited

Observable.js, line 47

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

Returns:
Revision.

on(type, listener){module:ol/events~EventsKey|Array.<module:ol/events~EventsKey>} inherited

Observable.js, line 60

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){module:ol/events~EventsKey|Array.<module:ol/events~EventsKey>} inherited

Observable.js, line 82

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.

removeFeature(feature, opt_unlisten)

interaction/Snap.js, line 310

Remove a feature from the collection of features that we may snap to.

Name Type Description
feature module:ol/Feature~Feature

Feature

unlisten boolean

Whether to unlisten to the feature change or not. Defaults to true.

set(key, value, opt_silent) inherited

Object.js, line 164

Sets a value.

Name Type Description
key string

Key name.

value *

Value.

silent boolean

Update without triggering an event.

setActive(active) inherited

interaction/Interaction.js, line 89

Activate or deactivate the interaction.

Name Type Description
active boolean

Active.

setProperties(values, opt_silent) inherited

Object.js, line 183

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) inherited

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.

unset(key, opt_silent) inherited

Object.js, line 195

Unsets a property.

Name Type Description
key string

Key name.

silent boolean

Unset without triggering an event.