65 lines
1.4 KiB
JavaScript
65 lines
1.4 KiB
JavaScript
goog.provide('ol.tilegrid.XYZ');
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goog.provide('ol.tilegrid.XYZOptions');
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goog.require('ol.Coordinate');
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goog.require('ol.Projection');
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goog.require('ol.Size');
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goog.require('ol.TileRange');
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goog.require('ol.tilegrid.TileGrid');
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/**
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* @typedef {{maxZoom: number}}
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*/
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ol.tilegrid.XYZOptions;
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/**
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* @constructor
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* @extends {ol.tilegrid.TileGrid}
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* @param {ol.tilegrid.XYZOptions} xyzOptions XYZ options.
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*/
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ol.tilegrid.XYZ = function(xyzOptions) {
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var resolutions = new Array(xyzOptions.maxZoom + 1);
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var z;
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for (z = 0; z <= xyzOptions.maxZoom; ++z) {
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resolutions[z] = ol.Projection.EPSG_3857_HALF_SIZE / (128 << z);
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}
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goog.base(this, {
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extent: ol.Projection.EPSG_3857_EXTENT,
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origin: new ol.Coordinate(-ol.Projection.EPSG_3857_HALF_SIZE,
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ol.Projection.EPSG_3857_HALF_SIZE),
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resolutions: resolutions,
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tileSize: new ol.Size(256, 256)
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});
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};
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goog.inherits(ol.tilegrid.XYZ, ol.tilegrid.TileGrid);
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/**
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* @inheritDoc
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*/
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ol.tilegrid.XYZ.prototype.forEachTileCoordParentTileRange =
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function(tileCoord, callback, opt_obj) {
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var x = tileCoord.x;
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var y = tileCoord.y;
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var z = tileCoord.z;
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var tileRange;
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while (true) {
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z -= 1;
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if (z < 0) {
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break;
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}
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x = Math.floor(x / 2);
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y = Math.floor(y / 2);
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tileRange = new ol.TileRange(x, y, x, y);
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if (callback.call(opt_obj, z, tileRange)) {
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break;
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}
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}
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};
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