OpenLayers 3 API Documentation

Class: ImageCanvas

ol.source.ImageCanvas

Base class for image sources where a canvas element is the image.

new ol.source.ImageCanvas(options) experimental

src/ol/source/imagecanvassource.js, line 19
Name Type Description
options
Name Type Description
attributions Array.<ol.Attribution> | undefined experimental

Attributions.
canvasFunction ol.CanvasFunctionType experimental

Canvas function. The function returning the canvas element used by the source as an image. The arguments passed to the function are: {ol.Extent} the image extent, {number} the image resolution, {number} the device pixel ratio, {ol.Size} the image size, and {ol.proj.Projection} the image projection. The canvas returned by this function is cached by the source. If the value returned by the function is later changed then dispatchChangeEvent should be called on the source for the source to invalidate the current cached image.
logo string | olx.LogoOptions | undefined experimental

Logo.
projection ol.proj.ProjectionLike experimental

Projection.
ratio number | undefined experimental

Ratio. 1 means canvases are the size of the map viewport, 2 means twice the size of the map viewport, and so on. Default is 1.5.
resolutions Array.<number> | undefined experimental

Resolutions. If specified, new canvases will be created for these resolutions only.
state ol.source.State | string | undefined experimental

Source state.
Fires:
  • change experimental - Triggered when the state of the source changes.

Subclasses

Extends

Methods

dispatchChangeEvent() inherited experimental

src/ol/observable.js, line 42

Dispatches a change event.

Fires:
  • change experimental

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

src/ol/source/source.js, line 96
Returns:
Attributions.
src/ol/source/source.js, line 105
Returns:
Logo.

getProjection(){ol.proj.Projection} inherited experimental

src/ol/source/source.js, line 114
Returns:
Projection.

getRevision(){number} inherited experimental

src/ol/observable.js, line 52
Returns:
Revision.

getState(){ol.source.State} inherited experimental

src/ol/source/source.js, line 129
Returns:
State.

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

src/ol/observable.js, line 65

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 78

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.

un(type, listener, opt_this) inherited

src/ol/observable.js, line 91

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 101

Removes an event listener using the key returned by on() or once().

Name Type Description
key goog.events.Key

Key.