113 lines
3.2 KiB
JavaScript
113 lines
3.2 KiB
JavaScript
// FIXME add minZoom support
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goog.provide('ol.source.XYZ');
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goog.provide('ol.source.XYZOptions');
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goog.require('goog.math');
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goog.require('ol.Attribution');
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goog.require('ol.Extent');
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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.ImageTileSource');
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goog.require('ol.tilegrid.XYZ');
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/**
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* @typedef {{attributions: (Array.<ol.Attribution>|undefined),
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* crossOrigin: (string|undefined),
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* extent: (ol.Extent|undefined),
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* maxZoom: number,
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* projection: (ol.Projection|undefined),
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* tileUrlFunction: (ol.TileUrlFunctionType|undefined),
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* url: (string|undefined),
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* urls: (Array.<string>|undefined)}}
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*/
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ol.source.XYZOptions;
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/**
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* @constructor
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* @extends {ol.source.ImageTileSource}
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* @param {ol.source.XYZOptions} xyzOptions XYZ options.
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*/
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ol.source.XYZ = function(xyzOptions) {
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var projection = xyzOptions.projection ||
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ol.Projection.getFromCode('EPSG:3857');
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/**
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* @type {ol.TileUrlFunctionType}
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*/
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var tileUrlFunction = ol.TileUrlFunction.nullTileUrlFunction;
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// FIXME use goog.nullFunction ?
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if (goog.isDef(xyzOptions.tileUrlFunction)) {
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tileUrlFunction = xyzOptions.tileUrlFunction;
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} else if (goog.isDef(xyzOptions.urls)) {
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tileUrlFunction = ol.TileUrlFunction.createFromTemplates(xyzOptions.urls);
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} else if (goog.isDef(xyzOptions.url)) {
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tileUrlFunction = ol.TileUrlFunction.createFromTemplate(xyzOptions.url);
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}
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var tileGrid = new ol.tilegrid.XYZ({
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maxZoom: xyzOptions.maxZoom
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});
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// FIXME factor out common code
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var extent = xyzOptions.extent;
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if (goog.isDefAndNotNull(extent)) {
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tileUrlFunction = ol.TileUrlFunction.withTileCoordTransform(
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function(tileCoord) {
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if (xyzOptions.maxZoom < tileCoord.z) {
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return null;
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}
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var n = 1 << tileCoord.z;
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var y = -tileCoord.y - 1;
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if (y < 0 || n <= y) {
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return null;
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}
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var x = goog.math.modulo(tileCoord.x, n);
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var tileExtent = tileGrid.getTileCoordExtent(
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new ol.TileCoord(tileCoord.z, x, tileCoord.y));
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// FIXME we shouldn't need a typecast here
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if (!tileExtent.intersects(/** @type {ol.Extent} */ (extent))) {
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return null;
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}
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return new ol.TileCoord(tileCoord.z, x, y);
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},
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tileUrlFunction);
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} else {
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tileUrlFunction = ol.TileUrlFunction.withTileCoordTransform(
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function(tileCoord) {
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if (xyzOptions.maxZoom < tileCoord.z) {
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return null;
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}
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var n = 1 << tileCoord.z;
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var y = -tileCoord.y - 1;
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if (y < 0 || n <= y) {
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return null;
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} else {
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var x = goog.math.modulo(tileCoord.x, n);
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return new ol.TileCoord(tileCoord.z, x, y);
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}
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},
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tileUrlFunction);
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}
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goog.base(this, {
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attributions: xyzOptions.attributions,
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crossOrigin: xyzOptions.crossOrigin,
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extent: xyzOptions.extent,
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projection: projection,
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tileGrid: tileGrid,
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tileUrlFunction: tileUrlFunction
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});
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};
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goog.inherits(ol.source.XYZ, ol.source.ImageTileSource);
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