144 lines
3.5 KiB
JavaScript
144 lines
3.5 KiB
JavaScript
goog.provide('ol.source.TileImage');
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goog.require('goog.asserts');
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goog.require('ol.ImageTile');
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goog.require('ol.Tile');
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goog.require('ol.TileCache');
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goog.require('ol.TileCoord');
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goog.require('ol.TileLoadFunctionType');
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goog.require('ol.TileState');
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goog.require('ol.TileUrlFunction');
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goog.require('ol.TileUrlFunctionType');
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goog.require('ol.source.Tile');
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/**
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* @constructor
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* @extends {ol.source.Tile}
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* @param {olx.source.TileImageOptions} options Image tile options.
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* @todo stability experimental
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*/
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ol.source.TileImage = 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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logo: options.logo,
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opaque: options.opaque,
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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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* @protected
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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 : null;
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/**
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* @protected
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* @type {ol.TileCache}
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*/
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this.tileCache = new ol.TileCache();
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/**
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* @protected
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* @type {ol.TileLoadFunctionType}
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*/
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this.tileLoadFunction = goog.isDef(options.tileLoadFunction) ?
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options.tileLoadFunction : ol.source.TileImage.defaultTileLoadFunction;
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/**
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* @protected
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* @type {function(new: ol.ImageTile, ol.TileCoord, ol.TileState, string,
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* ?string, ol.TileLoadFunctionType)}
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*/
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this.tileClass = goog.isDef(options.tileClass) ?
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options.tileClass : ol.ImageTile;
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};
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goog.inherits(ol.source.TileImage, ol.source.Tile);
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/**
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* @param {ol.ImageTile} imageTile Image tile.
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* @param {string} src Source.
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*/
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ol.source.TileImage.defaultTileLoadFunction = function(imageTile, src) {
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imageTile.getImage().src = src;
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};
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/**
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* @inheritDoc
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*/
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ol.source.TileImage.prototype.canExpireCache = function() {
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return this.tileCache.canExpireCache();
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};
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/**
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* @inheritDoc
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*/
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ol.source.TileImage.prototype.expireCache = function(usedTiles) {
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this.tileCache.expireCache(usedTiles);
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};
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/**
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* @inheritDoc
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*/
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ol.source.TileImage.prototype.getTile =
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function(z, x, y, pixelRatio, projection) {
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var tileCoordKey = this.getKeyZXY(z, x, y);
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if (this.tileCache.containsKey(tileCoordKey)) {
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return /** @type {!ol.Tile} */ (this.tileCache.get(tileCoordKey));
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} else {
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goog.asserts.assert(projection);
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var tileCoord = new ol.TileCoord(z, x, y);
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var tileUrl = this.tileUrlFunction(tileCoord, pixelRatio, projection);
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var tile = new this.tileClass(
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tileCoord,
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goog.isDef(tileUrl) ? ol.TileState.IDLE : ol.TileState.EMPTY,
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goog.isDef(tileUrl) ? tileUrl : '',
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this.crossOrigin,
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this.tileLoadFunction);
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this.tileCache.set(tileCoordKey, 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.TileUrlFunctionType} tileUrlFunction Tile URL function.
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*/
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ol.source.TileImage.prototype.setTileUrlFunction = function(tileUrlFunction) {
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// FIXME It should be possible to be more intelligent and avoid clearing the
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// FIXME cache. The tile URL function would need to be incorporated into the
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// FIXME cache key somehow.
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this.tileCache.clear();
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this.tileUrlFunction = tileUrlFunction;
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this.dispatchChangeEvent();
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};
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/**
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* @inheritDoc
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*/
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ol.source.TileImage.prototype.useTile = function(z, x, y) {
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var tileCoordKey = this.getKeyZXY(z, x, y);
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if (this.tileCache.containsKey(tileCoordKey)) {
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this.tileCache.get(tileCoordKey);
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}
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};
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