115 lines
2.8 KiB
JavaScript
115 lines
2.8 KiB
JavaScript
goog.provide('ol.source.ImageSource');
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goog.require('goog.array');
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goog.require('ol.Attribution');
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goog.require('ol.Extent');
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goog.require('ol.Image');
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goog.require('ol.ImageUrlFunction');
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goog.require('ol.ImageUrlFunctionType');
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goog.require('ol.Projection');
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goog.require('ol.Size');
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goog.require('ol.array');
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goog.require('ol.source.Source');
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/**
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* @typedef {{attributions: (Array.<ol.Attribution>|undefined),
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* crossOrigin: (null|string|undefined),
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* extent: (null|ol.Extent|undefined),
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* projection: (ol.Projection|undefined),
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* resolutions: (Array.<number>|undefined),
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* imageUrlFunction: (ol.ImageUrlFunctionType|
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* undefined)}}
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*/
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ol.source.ImageSourceOptions;
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/**
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* @constructor
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* @extends {ol.source.Source}
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* @param {ol.source.ImageSourceOptions} options Single
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* image source options.
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*/
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ol.source.ImageSource = function(options) {
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goog.base(this, {
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attributions: options.attributions,
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extent: options.extent,
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projection: options.projection
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});
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/**
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* @protected
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* @type {ol.ImageUrlFunctionType}
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*/
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this.imageUrlFunction =
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goog.isDef(options.imageUrlFunction) ?
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options.imageUrlFunction :
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ol.ImageUrlFunction.nullImageUrlFunction;
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/**
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* @private
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* @type {?string}
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*/
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this.crossOrigin_ =
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goog.isDef(options.crossOrigin) ? options.crossOrigin : 'anonymous';
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/**
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* @private
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* @type {Array.<number>}
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*/
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this.resolutions_ = goog.isDef(options.resolutions) ?
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options.resolutions : null;
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goog.asserts.assert(goog.isNull(this.resolutions_) ||
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goog.array.isSorted(this.resolutions_,
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function(a, b) {
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return b - a;
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}, true));
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};
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goog.inherits(ol.source.ImageSource, ol.source.Source);
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/**
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* @protected
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* @param {ol.Extent} extent Extent.
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* @param {number} resolution Resolution.
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* @param {ol.Size} size Size.
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* @return {ol.Image} Single image.
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*/
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ol.source.ImageSource.prototype.createImage =
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function(extent, resolution, size) {
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var image = null;
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var imageUrl = this.imageUrlFunction(extent, size);
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if (goog.isDef(imageUrl)) {
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image = new ol.Image(
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extent, resolution, imageUrl, this.crossOrigin_,
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this.getAttributions());
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}
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return image;
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};
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/**
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* @protected
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* @param {number} resolution Resolution.
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* @return {number} Resolution.
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*/
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ol.source.ImageSource.prototype.findNearestResolution =
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function(resolution) {
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if (!goog.isNull(this.resolutions_)) {
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var idx = ol.array.linearFindNearest(this.resolutions_, resolution);
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resolution = this.resolutions_[idx];
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}
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return resolution;
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};
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/**
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* @param {ol.Extent} extent Extent.
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* @param {number} resolution Resolution.
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* @return {ol.Image} Single image.
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*/
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ol.source.ImageSource.prototype.getImage = goog.abstractMethod;
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