134 lines
3.5 KiB
JavaScript
134 lines
3.5 KiB
JavaScript
goog.provide('ol.tilegrid.XYZ');
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goog.require('goog.math');
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goog.require('ol');
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goog.require('ol.TileCoord');
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goog.require('ol.TileRange');
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goog.require('ol.proj');
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goog.require('ol.proj.EPSG3857');
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goog.require('ol.tilegrid.TileGrid');
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/**
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* @classdesc
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* Set the grid pattern for sources accessing XYZ tiled-image servers.
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*
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* @constructor
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* @extends {ol.tilegrid.TileGrid}
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* @param {olx.tilegrid.XYZOptions} options XYZ options.
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* @struct
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* @todo api
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*/
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ol.tilegrid.XYZ = function(options) {
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var resolutions = new Array(options.maxZoom + 1);
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var z;
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var size = 2 * ol.proj.EPSG3857.HALF_SIZE / ol.DEFAULT_TILE_SIZE;
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for (z = 0; z <= options.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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minZoom: options.minZoom,
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origin: [-ol.proj.EPSG3857.HALF_SIZE, ol.proj.EPSG3857.HALF_SIZE],
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resolutions: resolutions,
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tileSize: 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.createTileCoordTransform = function(opt_options) {
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var options = goog.isDef(opt_options) ? opt_options : {};
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var minZ = this.minZoom;
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var maxZ = this.maxZoom;
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var wrapX = goog.isDef(options.wrapX) ? options.wrapX : true;
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var tmpTileCoord = new ol.TileCoord(0, 0, 0);
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/** @type {Array.<ol.TileRange>} */
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var tileRangeByZ = null;
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if (goog.isDef(options.extent)) {
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tileRangeByZ = new Array(maxZ + 1);
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var z;
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for (z = 0; z <= maxZ; ++z) {
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if (z < minZ) {
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tileRangeByZ[z] = null;
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} else {
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tileRangeByZ[z] = this.getTileRangeForExtentAndZ(options.extent, z);
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}
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}
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}
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return (
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/**
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* @param {ol.TileCoord} tileCoord Tile coordinate.
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* @param {ol.proj.Projection} projection Projection.
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* @param {ol.TileCoord=} opt_tileCoord Destination tile coordinate.
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* @return {ol.TileCoord} Tile coordinate.
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*/
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function(tileCoord, projection, opt_tileCoord) {
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var z = tileCoord.z;
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if (z < minZ || maxZ < z) {
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return null;
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}
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var n = Math.pow(2, z);
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var x = tileCoord.x;
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if (wrapX) {
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x = goog.math.modulo(x, n);
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} else if (x < 0 || n <= x) {
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return null;
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}
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var y = tileCoord.y;
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if (y < -n || -1 < y) {
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return null;
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}
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if (!goog.isNull(tileRangeByZ)) {
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tmpTileCoord.z = z;
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tmpTileCoord.x = x;
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tmpTileCoord.y = y;
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if (!tileRangeByZ[z].contains(tmpTileCoord)) {
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return null;
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}
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}
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return ol.TileCoord.createOrUpdate(z, x, -y - 1, opt_tileCoord);
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});
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};
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/**
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* @inheritDoc
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*/
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ol.tilegrid.XYZ.prototype.getTileCoordChildTileRange =
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function(tileCoord, opt_tileRange) {
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if (tileCoord.z < this.maxZoom) {
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return ol.TileRange.createOrUpdate(
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2 * tileCoord.x, 2 * (tileCoord.x + 1),
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2 * tileCoord.y, 2 * (tileCoord.y + 1),
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opt_tileRange);
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} else {
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return null;
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}
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};
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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_this, opt_tileRange) {
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var tileRange = ol.TileRange.createOrUpdate(
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0, tileCoord.x, 0, tileCoord.y, opt_tileRange);
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var z;
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for (z = tileCoord.z - 1; z >= this.minZoom; --z) {
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tileRange.minX = tileRange.maxX >>= 1;
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tileRange.minY = tileRange.maxY >>= 1;
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if (callback.call(opt_this, z, tileRange)) {
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return true;
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}
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}
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return false;
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};
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