127 lines
3.1 KiB
JavaScript
127 lines
3.1 KiB
JavaScript
goog.provide('ol.TileStore');
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goog.provide('ol.TileStore.createOpenStreetMap');
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goog.require('ol.Store');
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goog.require('ol.Tile');
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goog.require('ol.TileCoord');
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goog.require('ol.TileGrid');
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goog.require('ol.TileUrlFunctionType');
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/**
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* @constructor
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* @extends {ol.Store}
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* @param {ol.Projection} projection Projection.
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* @param {ol.TileGrid} tileGrid Tile grid.
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* @param {ol.TileUrlFunctionType} tileUrlFunction Tile URL.
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* @param {ol.Extent=} opt_extent Extent.
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* @param {string=} opt_attribution Attribution.
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* @param {string=} opt_crossOrigin Cross origin.
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*/
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ol.TileStore = function(projection, tileGrid, tileUrlFunction, opt_extent,
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opt_attribution, opt_crossOrigin) {
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goog.base(this, projection, opt_extent, opt_attribution);
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/**
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* @private
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* @type {ol.TileGrid}
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*/
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this.tileGrid_ = tileGrid;
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/**
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* @private
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* @type {ol.TileUrlFunctionType}
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*/
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this.tileUrlFunction_ = tileUrlFunction;
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/**
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* @private
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* @type {string|undefined}
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*/
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this.crossOrigin_ = opt_crossOrigin;
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/**
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* @private
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* @type {Object.<string, ol.Tile>}
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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.TileStore, ol.Store);
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/**
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* @return {ol.TileStore} Tile store.
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*/
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ol.TileStore.createOpenStreetMap = function() {
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var projection = ol.Projection.createFromCode('EPSG:3857');
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var tileGrid = ol.TileGrid.createOpenStreetMap(18);
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var tileUrlFunction = ol.TileUrlFunction.withTileCoordTransform(
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function(tileCoord) {
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return new ol.TileCoord(tileCoord.z, tileCoord.x, -tileCoord.y - 1);
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},
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ol.TileUrlFunction.createFromTemplates([
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'http://a.tile.openstreetmap.org/{z}/{x}/{y}.png',
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'http://b.tile.openstreetmap.org/{z}/{x}/{y}.png',
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'http://c.tile.openstreetmap.org/{z}/{x}/{y}.png'
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]));
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var extent = projection.getExtent();
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var attribution =
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'© ' +
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'<a href="http://www.openstreetmap.org">OpenStreetMap</a> ' +
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'contributors, ' +
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'<a href="http://creativecommons.org/licenses/by-sa/2.0/">CC BY-SA</a>';
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var crossOrigin = '';
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return new ol.TileStore(
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projection, tileGrid, tileUrlFunction, extent, attribution, crossOrigin);
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};
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/**
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* @inheritDoc
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*/
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ol.TileStore.prototype.getResolutions = function() {
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return this.tileGrid_.getResolutions();
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};
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/**
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* @param {ol.TileCoord} tileCoord Tile coordinate.
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* @return {ol.Tile} Tile.
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*/
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ol.TileStore.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 = new ol.Tile(tileCoord, tileUrl, this.crossOrigin_);
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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} Tile coord URL.
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*/
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ol.TileStore.prototype.getTileCoordUrl = function(tileCoord) {
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return this.tileUrlFunction_(tileCoord);
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};
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/**
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* @return {ol.TileGrid} Tile grid.
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*/
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ol.TileStore.prototype.getTileGrid = function() {
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return this.tileGrid_;
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};
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