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openlayers

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Build tools and sources for developing OpenLayers based mapping applications

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goog.provide('ol.TileUrlFunction'); goog.require('ol'); goog.require('ol.asserts'); goog.require('ol.math'); goog.require('ol.tilecoord'); /** * @param {string} template Template. * @param {ol.tilegrid.TileGrid} tileGrid Tile grid. * @return {ol.TileUrlFunctionType} Tile URL function. */ ol.TileUrlFunction.createFromTemplate = function(template, tileGrid) { var zRegEx = /\{z\}/g; var xRegEx = /\{x\}/g; var yRegEx = /\{y\}/g; var dashYRegEx = /\{-y\}/g; return ( /** * @param {ol.TileCoord} tileCoord Tile Coordinate. * @param {number} pixelRatio Pixel ratio. * @param {ol.proj.Projection} projection Projection. * @return {string|undefined} Tile URL. */ function(tileCoord, pixelRatio, projection) { if (!tileCoord) { return undefined; } else { return template.replace(zRegEx, tileCoord[0].toString()) .replace(xRegEx, tileCoord[1].toString()) .replace(yRegEx, function() { var y = -tileCoord[2] - 1; return y.toString(); }) .replace(dashYRegEx, function() { var z = tileCoord[0]; var range = tileGrid.getFullTileRange(z); ol.asserts.assert(range, 55); // The {-y} placeholder requires a tile grid with extent var y = range.getHeight() + tileCoord[2]; return y.toString(); }); } }); }; /** * @param {Array.<string>} templates Templates. * @param {ol.tilegrid.TileGrid} tileGrid Tile grid. * @return {ol.TileUrlFunctionType} Tile URL function. */ ol.TileUrlFunction.createFromTemplates = function(templates, tileGrid) { var len = templates.length; var tileUrlFunctions = new Array(len); for (var i = 0; i < len; ++i) { tileUrlFunctions[i] = ol.TileUrlFunction.createFromTemplate( templates[i], tileGrid); } return ol.TileUrlFunction.createFromTileUrlFunctions(tileUrlFunctions); }; /** * @param {Array.<ol.TileUrlFunctionType>} tileUrlFunctions Tile URL Functions. * @return {ol.TileUrlFunctionType} Tile URL function. */ ol.TileUrlFunction.createFromTileUrlFunctions = function(tileUrlFunctions) { ol.DEBUG && console.assert(tileUrlFunctions.length > 0, 'Length of tile url functions should be greater than 0'); if (tileUrlFunctions.length === 1) { return tileUrlFunctions[0]; } return ( /** * @param {ol.TileCoord} tileCoord Tile Coordinate. * @param {number} pixelRatio Pixel ratio. * @param {ol.proj.Projection} projection Projection. * @return {string|undefined} Tile URL. */ function(tileCoord, pixelRatio, projection) { if (!tileCoord) { return undefined; } else { var h = ol.tilecoord.hash(tileCoord); var index = ol.math.modulo(h, tileUrlFunctions.length); return tileUrlFunctions[index](tileCoord, pixelRatio, projection); } }); }; /** * @param {ol.TileCoord} tileCoord Tile coordinate. * @param {number} pixelRatio Pixel ratio. * @param {ol.proj.Projection} projection Projection. * @return {string|undefined} Tile URL. */ ol.TileUrlFunction.nullTileUrlFunction = function(tileCoord, pixelRatio, projection) { return undefined; }; /** * @param {string} url URL. * @return {Array.<string>} Array of urls. */ ol.TileUrlFunction.expandUrl = function(url) { var urls = []; var match = /\{([a-z])-([a-z])\}/.exec(url); if (match) { // char range var startCharCode = match[1].charCodeAt(0); var stopCharCode = match[2].charCodeAt(0); var charCode; for (charCode = startCharCode; charCode <= stopCharCode; ++charCode) { urls.push(url.replace(match[0], String.fromCharCode(charCode))); } return urls; } match = match = /\{(\d+)-(\d+)\}/.exec(url); if (match) { // number range var stop = parseInt(match[2], 10); for (var i = parseInt(match[1], 10); i <= stop; i++) { urls.push(url.replace(match[0], i.toString())); } return urls; } urls.push(url); return urls; };