59 lines
1.3 KiB
JavaScript
59 lines
1.3 KiB
JavaScript
goog.provide('ol.tilegrid.XYZ');
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goog.require('ol.Coordinate');
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goog.require('ol.Size');
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goog.require('ol.TileRange');
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goog.require('ol.projection');
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goog.require('ol.projection.EPSG3857');
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goog.require('ol.tilegrid.TileGrid');
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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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var size = 2 * ol.projection.EPSG3857.HALF_SIZE / ol.DEFAULT_TILE_SIZE;
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for (z = 0; z <= xyzOptions.maxZoom; ++z) {
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resolutions[z] = size / Math.pow(2, z);
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}
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goog.base(this, {
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origin: new ol.Coordinate(-ol.projection.EPSG3857.HALF_SIZE,
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ol.projection.EPSG3857.HALF_SIZE),
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resolutions: resolutions,
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tileSize: new ol.Size(ol.DEFAULT_TILE_SIZE, ol.DEFAULT_TILE_SIZE)
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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 >>= 1;
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y >>= 1;
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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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