OpenLayers

Class: ImageVector

ol.source.ImageVector

An image source whose images are canvas elements into which vector features read from a vector source (ol.source.Vector) are drawn. An ol.source.ImageVector object is to be used as the source of an image layer (ol.layer.Image). Image layers are rotated, scaled, and translated, as opposed to being re-rendered, during animations and interactions. So, like any other image layer, an image layer configured with an ol.source.ImageVector will exhibit this behaviour. This is in contrast to a vector layer, where vector features are re-drawn during animations and interactions.

new ol.source.ImageVector(options)

src/ol/source/imagevector.js, line 32
Name Type Description
options

Options.

Name Type Description
attributions ol.AttributionLike | undefined

Attributions.
logo string | olx.LogoOptions | undefined

Logo.
projection ol.ProjectionLike

Projection.
ratio number | undefined

Ratio. 1 means canvases are the size of the map viewport, 2 means twice the width and height of the map viewport, and so on. Must be 1 or higher. Default is 1.5.
renderBuffer number | undefined

The buffer around the viewport extent used by the renderer when getting features from the vector source for the rendering or hit-detection. Recommended value: the size of the largest symbol, line width or label. Default is 100 pixels.
resolutions Array.<number> | undefined

Resolutions. If specified, new canvases will be created for these resolutions only.
source ol.source.Vector

The vector source from which the vector features drawn in canvas elements are read. Required.
style ol.style.Style | Array.<ol.style.Style> | ol.StyleFunction | undefined

Style to use when rendering features to the canvas.
Fires:

Extends

Methods

changed() inherited

src/ol/observable.js, line 58

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

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.

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.

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/imagevector.js, line 186

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.

getStyle(){ol.style.Style|Array.<ol.style.Style>|ol.StyleFunction}

src/ol/source/imagevector.js, line 198

Get the style for features. This returns whatever was passed to the style option at construction or to the setStyle method.

Returns:
Layer style.

getStyleFunction(){ol.StyleFunction|undefined}

src/ol/source/imagevector.js, line 208

Get the style function.

Returns:
Layer style function.

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.

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.

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.

setStyle(style)

src/ol/source/imagevector.js, line 297

Set the style for features. This can be a single style object, an array of styles, or a function that takes a feature and resolution and returns an array of styles. If it is undefined the default style is used. If it is null the layer has no style (a null style), so only features that have their own styles will be rendered in the layer. See ol.style for information on the default style.

Name Type Description
style ol.style.Style | Array.<ol.style.Style> | ol.StyleFunction | undefined

Layer style.

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.