openlayers
Version:
Build tools and sources for developing OpenLayers based mapping applications
130 lines (117 loc) • 2.95 kB
JavaScript
goog.provide('ol.source.Stamen');
goog.require('ol');
goog.require('ol.Attribution');
goog.require('ol.source.OSM');
goog.require('ol.source.XYZ');
/**
* @classdesc
* Layer source for the Stamen tile server.
*
* @constructor
* @extends {ol.source.XYZ}
* @param {olx.source.StamenOptions} options Stamen options.
* @api stable
*/
ol.source.Stamen = function(options) {
var i = options.layer.indexOf('-');
var provider = i == -1 ? options.layer : options.layer.slice(0, i);
ol.DEBUG && console.assert(provider in ol.source.Stamen.ProviderConfig,
'known provider configured');
var providerConfig = ol.source.Stamen.ProviderConfig[provider];
ol.DEBUG && console.assert(options.layer in ol.source.Stamen.LayerConfig,
'known layer configured');
var layerConfig = ol.source.Stamen.LayerConfig[options.layer];
var url = options.url !== undefined ? options.url :
'https://stamen-tiles-{a-d}.a.ssl.fastly.net/' + options.layer +
'/{z}/{x}/{y}.' + layerConfig.extension;
ol.source.XYZ.call(this, {
attributions: ol.source.Stamen.ATTRIBUTIONS,
cacheSize: options.cacheSize,
crossOrigin: 'anonymous',
maxZoom: options.maxZoom != undefined ? options.maxZoom : providerConfig.maxZoom,
minZoom: options.minZoom != undefined ? options.minZoom : providerConfig.minZoom,
opaque: layerConfig.opaque,
reprojectionErrorThreshold: options.reprojectionErrorThreshold,
tileLoadFunction: options.tileLoadFunction,
url: url
});
};
ol.inherits(ol.source.Stamen, ol.source.XYZ);
/**
* @const
* @type {Array.<ol.Attribution>}
*/
ol.source.Stamen.ATTRIBUTIONS = [
new ol.Attribution({
html: 'Map tiles by <a href="http://stamen.com/">Stamen Design</a>, ' +
'under <a href="http://creativecommons.org/licenses/by/3.0/">CC BY' +
' 3.0</a>.'
}),
ol.source.OSM.ATTRIBUTION
];
/**
* @type {Object.<string, {extension: string, opaque: boolean}>}
*/
ol.source.Stamen.LayerConfig = {
'terrain': {
extension: 'jpg',
opaque: true
},
'terrain-background': {
extension: 'jpg',
opaque: true
},
'terrain-labels': {
extension: 'png',
opaque: false
},
'terrain-lines': {
extension: 'png',
opaque: false
},
'toner-background': {
extension: 'png',
opaque: true
},
'toner': {
extension: 'png',
opaque: true
},
'toner-hybrid': {
extension: 'png',
opaque: false
},
'toner-labels': {
extension: 'png',
opaque: false
},
'toner-lines': {
extension: 'png',
opaque: false
},
'toner-lite': {
extension: 'png',
opaque: true
},
'watercolor': {
extension: 'jpg',
opaque: true
}
};
/**
* @type {Object.<string, {minZoom: number, maxZoom: number}>}
*/
ol.source.Stamen.ProviderConfig = {
'terrain': {
minZoom: 4,
maxZoom: 18
},
'toner': {
minZoom: 0,
maxZoom: 20
},
'watercolor': {
minZoom: 1,
maxZoom: 16
}
};