96 lines
2.4 KiB
JavaScript
96 lines
2.4 KiB
JavaScript
goog.provide('ol.source.ImageTileSource');
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goog.provide('ol.source.ImageTileSourceOptions');
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goog.require('ol.Attribution');
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goog.require('ol.Extent');
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goog.require('ol.ImageTile');
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goog.require('ol.Projection');
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goog.require('ol.TileCoord');
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goog.require('ol.TileUrlFunction');
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goog.require('ol.TileUrlFunctionType');
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goog.require('ol.source.TileSource');
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goog.require('ol.tilegrid.TileGrid');
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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: (ol.Extent|undefined),
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* projection: (ol.Projection|undefined),
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* tileGrid: (ol.tilegrid.TileGrid|undefined),
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* tileUrlFunction: (ol.TileUrlFunctionType|undefined)}}
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*/
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ol.source.ImageTileSourceOptions;
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/**
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* @constructor
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* @extends {ol.source.TileSource}
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* @param {ol.source.ImageTileSourceOptions} options Options.
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*/
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ol.source.ImageTileSource = 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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tileGrid: options.tileGrid
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});
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/**
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* @protected
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* @type {ol.TileUrlFunctionType}
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*/
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this.tileUrlFunction = goog.isDef(options.tileUrlFunction) ?
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options.tileUrlFunction :
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ol.TileUrlFunction.nullTileUrlFunction;
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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 {Object.<string, ol.ImageTile>}
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* FIXME will need to expire elements from this cache
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* FIXME see elemoine's work with goog.structs.LinkedMap
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*/
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this.tileCache_ = {};
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};
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goog.inherits(ol.source.ImageTileSource, ol.source.TileSource);
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/**
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* @inheritDoc
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*/
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ol.source.ImageTileSource.prototype.getTile = function(tileCoord) {
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var key = tileCoord.toString();
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if (goog.object.containsKey(this.tileCache_, key)) {
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return this.tileCache_[key];
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} else {
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var tileUrl = this.getTileCoordUrl(tileCoord);
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var tile;
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if (goog.isDef(tileUrl)) {
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tile = new ol.ImageTile(tileCoord, tileUrl, this.crossOrigin_);
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} else {
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tile = null;
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}
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this.tileCache_[key] = tile;
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return tile;
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}
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};
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/**
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* @param {ol.TileCoord} tileCoord Tile coordinate.
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* @return {string|undefined} Tile URL.
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*/
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ol.source.ImageTileSource.prototype.getTileCoordUrl = function(tileCoord) {
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return this.tileUrlFunction(tileCoord);
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};
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