119 lines
3.3 KiB
JavaScript
119 lines
3.3 KiB
JavaScript
goog.provide('ol.TileUrlFunction');
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goog.provide('ol.TileUrlFunctionType');
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goog.require('goog.array');
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goog.require('goog.math');
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goog.require('goog.uri.utils');
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goog.require('ol.TileCoord');
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goog.require('ol.tilegrid.TileGrid');
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/**
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* @typedef {function(ol.TileCoord): (string|undefined)}
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*/
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ol.TileUrlFunctionType;
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/**
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* @param {string} template Template.
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* @return {ol.TileUrlFunctionType} Tile URL function.
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*/
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ol.TileUrlFunction.createFromTemplate = function(template) {
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var match =
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/\{(\d)-(\d)\}/.exec(template) || /\{([a-z])-([a-z])\}/.exec(template);
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if (match) {
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var templates = [];
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var startCharCode = match[1].charCodeAt(0);
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var stopCharCode = match[2].charCodeAt(0);
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var charCode;
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for (charCode = startCharCode; charCode <= stopCharCode; ++charCode) {
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templates.push(template.replace(match[0], String.fromCharCode(charCode)));
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}
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return ol.TileUrlFunction.createFromTemplates(templates);
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} else {
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return function(tileCoord) {
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if (goog.isNull(tileCoord)) {
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return undefined;
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} else {
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return template.replace('{z}', tileCoord.z)
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.replace('{x}', tileCoord.x)
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.replace('{y}', tileCoord.y);
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}
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};
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}
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};
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/**
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* @param {Array.<string>} templates Templates.
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* @return {ol.TileUrlFunctionType} Tile URL function.
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*/
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ol.TileUrlFunction.createFromTemplates = function(templates) {
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return ol.TileUrlFunction.createFromTileUrlFunctions(
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goog.array.map(templates, ol.TileUrlFunction.createFromTemplate));
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};
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/**
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* @param {Array.<ol.TileUrlFunctionType>} tileUrlFunctions Tile URL Functions.
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* @return {ol.TileUrlFunctionType} Tile URL function.
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*/
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ol.TileUrlFunction.createFromTileUrlFunctions = function(tileUrlFunctions) {
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return function(tileCoord) {
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if (goog.isNull(tileCoord)) {
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return undefined;
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} else {
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var index = goog.math.modulo(tileCoord.hash(), tileUrlFunctions.length);
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return tileUrlFunctions[index](tileCoord);
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}
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};
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};
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/**
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* @param {string} baseUrl Base URL (may have query data).
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* @param {ol.tilegrid.TileGrid} tileGrid Tile grid.
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* @return {ol.TileUrlFunctionType} Tile URL function.
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*/
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ol.TileUrlFunction.createBboxParam = function(baseUrl, tileGrid) {
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return function(tileCoord) {
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if (goog.isNull(tileCoord)) {
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return undefined;
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} else {
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var tileExtent = tileGrid.getTileCoordExtent(tileCoord);
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// FIXME Projection dependant axis order.
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var bboxValue = [
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tileExtent.minX, tileExtent.minY, tileExtent.maxX, tileExtent.maxY
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].join(',');
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return goog.uri.utils.appendParam(baseUrl, 'BBOX', bboxValue);
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}
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};
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};
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/**
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* @param {ol.TileCoord} tileCoord Tile coordinate.
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* @return {string|undefined} Tile URL.
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*/
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ol.TileUrlFunction.nullTileUrlFunction = function(tileCoord) {
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return undefined;
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};
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/**
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* @param {function(ol.TileCoord): ol.TileCoord} transformFn
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* Transform.function.
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* @param {ol.TileUrlFunctionType} tileUrlFunction Tile URL function.
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* @return {ol.TileUrlFunctionType} Tile URL function.
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*/
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ol.TileUrlFunction.withTileCoordTransform =
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function(transformFn, tileUrlFunction) {
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return function(tileCoord) {
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if (goog.isNull(tileCoord)) {
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return undefined;
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} else {
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return tileUrlFunction(transformFn(tileCoord));
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}
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};
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};
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