Module: ol/source/ImageCanvas

Classes

ImageCanvasSource

Type Definitions

FunctionType()

source/ImageCanvas.js, line 14

A function returning the canvas element ({HTMLCanvasElement}) used by the source as an image. The arguments passed to the function are: Extent the image extent, {number} the image resolution, {number} the pixel ratio of the map, Size the image size, and Projection the image projection. The canvas returned by this function is cached by the source. The this keyword inside the function references the ImageCanvasSource.

Options{Object}

Properties:

Name	Type	Argument	Default	Description
attributions	AttributionLike	<optional>		Attributions.
canvasFunction	FunctionType	<optional>		Canvas function. The function returning the canvas element used by the source as an image. The arguments passed to the function are: Extent the image extent, {number} the image resolution, {number} the pixel ratio of the map, Size the image size, and 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 changed should be called on the source for the source to invalidate the current cached image. See: changed
interpolate	boolean	<optional>	true	Use interpolated values when resampling. By default, linear interpolation is used when resampling. Set to false to use the nearest neighbor instead.
projection	ProjectionLike	<optional>		Projection. Default is the view projection.
ratio	number	<optional>	1.5	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.
resolutions	Array.<number>	<optional>		Resolutions. If specified, new canvases will be created for these resolutions
state	State	<optional>		Source state.