111 lines
2.4 KiB
JavaScript
111 lines
2.4 KiB
JavaScript
goog.provide('ol.tilecoord');
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goog.require('ol');
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/**
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* @param {string} str String that follows pattern “z/x/y” where x, y and z are
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* numbers.
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* @return {ol.TileCoord} Tile coord.
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*/
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ol.tilecoord.createFromString = function(str) {
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var v = str.split('/');
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ol.DEBUG && console.assert(v.length === 3,
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'must provide a string in "z/x/y" format, got "%s"', str);
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return v.map(function(e) {
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return parseInt(e, 10);
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});
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};
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/**
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* @param {number} z Z.
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* @param {number} x X.
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* @param {number} y Y.
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* @param {ol.TileCoord=} opt_tileCoord Tile coordinate.
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* @return {ol.TileCoord} Tile coordinate.
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*/
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ol.tilecoord.createOrUpdate = function(z, x, y, opt_tileCoord) {
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if (opt_tileCoord !== undefined) {
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opt_tileCoord[0] = z;
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opt_tileCoord[1] = x;
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opt_tileCoord[2] = y;
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return opt_tileCoord;
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} else {
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return [z, x, y];
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}
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};
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/**
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* @param {number} z Z.
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* @param {number} x X.
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* @param {number} y Y.
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* @return {string} Key.
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*/
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ol.tilecoord.getKeyZXY = function(z, x, y) {
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return z + '/' + x + '/' + y;
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};
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/**
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* @param {ol.TileCoord} tileCoord Tile coord.
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* @return {number} Hash.
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*/
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ol.tilecoord.hash = function(tileCoord) {
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return (tileCoord[1] << tileCoord[0]) + tileCoord[2];
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};
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/**
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* @param {ol.TileCoord} tileCoord Tile coord.
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* @return {string} Quad key.
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*/
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ol.tilecoord.quadKey = function(tileCoord) {
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var z = tileCoord[0];
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var digits = new Array(z);
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var mask = 1 << (z - 1);
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var i, charCode;
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for (i = 0; i < z; ++i) {
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// 48 is charCode for 0 - '0'.charCodeAt(0)
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charCode = 48;
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if (tileCoord[1] & mask) {
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charCode += 1;
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}
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if (tileCoord[2] & mask) {
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charCode += 2;
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}
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digits[i] = String.fromCharCode(charCode);
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mask >>= 1;
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}
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return digits.join('');
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};
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/**
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* @param {ol.TileCoord} tileCoord Tile coordinate.
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* @param {!ol.tilegrid.TileGrid} tileGrid Tile grid.
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* @return {boolean} Tile coordinate is within extent and zoom level range.
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*/
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ol.tilecoord.withinExtentAndZ = function(tileCoord, tileGrid) {
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var z = tileCoord[0];
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var x = tileCoord[1];
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var y = tileCoord[2];
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if (tileGrid.getMinZoom() > z || z > tileGrid.getMaxZoom()) {
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return false;
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}
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var extent = tileGrid.getExtent();
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var tileRange;
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if (!extent) {
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tileRange = tileGrid.getFullTileRange(z);
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} else {
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tileRange = tileGrid.getTileRangeForExtentAndZ(extent, z);
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}
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if (!tileRange) {
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return true;
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} else {
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return tileRange.containsXY(x, y);
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}
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};
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