100 lines
1.7 KiB
JavaScript
100 lines
1.7 KiB
JavaScript
/**
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* @module ol/ImageBase
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*/
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import {inherits} from './util.js';
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import EventTarget from './events/EventTarget.js';
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import EventType from './events/EventType.js';
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/**
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* @constructor
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* @abstract
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* @extends {module:ol/events/EventTarget}
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* @param {module:ol/extent~Extent} extent Extent.
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* @param {number|undefined} resolution Resolution.
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* @param {number} pixelRatio Pixel ratio.
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* @param {module:ol/ImageState} state State.
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*/
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class ImageBase {
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constructor(extent, resolution, pixelRatio, state) {
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EventTarget.call(this);
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/**
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* @protected
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* @type {module:ol/extent~Extent}
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*/
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this.extent = extent;
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/**
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* @private
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* @type {number}
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*/
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this.pixelRatio_ = pixelRatio;
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/**
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* @protected
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* @type {number|undefined}
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*/
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this.resolution = resolution;
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/**
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* @protected
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* @type {module:ol/ImageState}
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*/
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this.state = state;
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}
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/**
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* @protected
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*/
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changed() {
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this.dispatchEvent(EventType.CHANGE);
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}
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/**
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* @return {module:ol/extent~Extent} Extent.
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*/
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getExtent() {
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return this.extent;
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}
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/**
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* @abstract
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* @return {HTMLCanvasElement|HTMLImageElement|HTMLVideoElement} Image.
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*/
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getImage() {}
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/**
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* @return {number} PixelRatio.
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*/
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getPixelRatio() {
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return this.pixelRatio_;
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}
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/**
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* @return {number} Resolution.
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*/
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getResolution() {
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return /** @type {number} */ (this.resolution);
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}
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/**
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* @return {module:ol/ImageState} State.
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*/
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getState() {
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return this.state;
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}
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/**
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* Load not yet loaded URI.
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* @abstract
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*/
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load() {}
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}
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inherits(ImageBase, EventTarget);
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export default ImageBase;
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