CanvasSource
A data source containing the contents of an HTML canvas. See CanvasSourceSpecification for detailed documentation of options.
Example
// add to map
map.addSource('some id', {
type: 'canvas',
canvas: 'idOfMyHTMLCanvas',
animate: true,
coordinates: [
[-76.54, 39.18],
[-76.52, 39.18],
[-76.52, 39.17],
[-76.54, 39.17]
]
});
// update
let mySource = map.getSource('some id');
mySource.setCoordinates([
[-76.54335737228394, 39.18579907229748],
[-76.52803659439087, 39.1838364847587],
[-76.5295386314392, 39.17683392507606],
[-76.54520273208618, 39.17876344106642]
]);
map.removeSource('some id'); // remove
Extends
Methods
getCanvas()
getCanvas():
HTMLCanvasElement
Returns the HTML canvas
element.
Returns
HTMLCanvasElement
The HTML canvas
element.
Source
src/source/canvas_source.ts:147
listens()
listens(
type
:string
):boolean
Returns a true if this instance of Evented or any forwardeed instances of Evented have a listener for the specified type.
Parameters
Parameter | Type | Description |
---|---|---|
type |
string |
The event type |
Returns
boolean
true
if there is at least one registered listener for specified event type, false
otherwise
Inherited from
Source
off()
off(
type
:string
,listener
:Listener
):CanvasSource
Removes a previously registered event listener.
Parameters
Parameter | Type | Description |
---|---|---|
type |
string |
The event type to remove listeners for. |
listener |
Listener |
The listener function to remove. |
Returns
Inherited from
Source
on()
on(
type
:string
,listener
:Listener
):this
Adds a listener to a specified event type.
Parameters
Parameter | Type | Description |
---|---|---|
type |
string |
The event type to add a listen for. |
listener |
Listener |
The function to be called when the event is fired. The listener function is called with the data object passed to fire ,extended with target and type properties. |
Returns
this
Inherited from
Source
once()
once(
type
:string
,listener
?:Listener
):Promise
<any
> |CanvasSource
Adds a listener that will be called only once to a specified event type.
The listener will be called first time the event fires after the listener is registered.
Parameters
Parameter | Type | Description |
---|---|---|
type |
string |
The event type to listen for. |
listener ? |
Listener |
The function to be called when the event is fired the first time. |
Returns
Promise
<any
> | CanvasSource
this
or a promise if a listener is not provided
Inherited from
Source
setCoordinates()
setCoordinates(
coordinates
:Coordinates
):this
Sets the image's coordinates and re-renders the map.
Parameters
Parameter | Type | Description |
---|---|---|
coordinates |
Coordinates |
Four geographical coordinates, represented as arrays of longitude and latitude numbers, which define the corners of the image. The coordinates start at the top left corner of the image and proceed in clockwise order. They do not have to represent a rectangle. |
Returns
this
Inherited from
Source
src/source/image_source.ts:207
setEventedParent()
setEventedParent(
parent
?:Evented
,data
?:any
):CanvasSource
Bubble all events fired by this instance of Evented to this parent instance of Evented.
Parameters
Parameter | Type |
---|---|
parent ? |
Evented |
data ? |
any |
Returns
Inherited from
Source
updateImage()
updateImage(
options
:UpdateImageOptions
):this
Updates the image URL and, optionally, the coordinates. To avoid having the image flash after changing,
set the raster-fade-duration
paint property on the raster layer to 0.
Parameters
Parameter | Type | Description |
---|---|---|
options |
UpdateImageOptions |
The options object. |
Returns
this
Inherited from
Source
src/source/image_source.ts:165
Properties
pause()
pause: () =>
void
Disables animation. The map will display a static copy of the canvas image.
Returns
void
Source
src/source/canvas_source.ts:81
play()
play: () =>
void
Enables animation. The image will be copied from the canvas to the map on each frame.
Returns
void