105 lines
1.9 KiB
JavaScript
105 lines
1.9 KiB
JavaScript
goog.require('ol.Map');
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goog.require('ol.View');
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goog.require('ol.layer.Tile');
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goog.require('ol.source.TileJSON');
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/**
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* Renders a progress bar.
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* @param {Element} el The target element.
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* @constructor
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*/
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function Progress(el) {
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this.el = el;
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this.loading = 0;
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this.loaded = 0;
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}
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/**
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* Increment the count of loading tiles.
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*/
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Progress.prototype.addLoading = function() {
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if (this.loading === 0) {
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this.show();
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}
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++this.loading;
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this.update();
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};
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/**
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* Increment the count of loaded tiles.
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*/
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Progress.prototype.addLoaded = function() {
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setTimeout(function() {
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++this.loaded;
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this.update();
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}.bind(this), 100);
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};
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/**
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* Update the progress bar.
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*/
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Progress.prototype.update = function() {
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var width = (this.loaded / this.loading * 100).toFixed(1) + '%';
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this.el.style.width = width;
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if (this.loading === this.loaded) {
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this.loading = 0;
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this.loaded = 0;
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setTimeout(this.hide.bind(this), 500);
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}
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};
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/**
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* Show the progress bar.
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*/
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Progress.prototype.show = function() {
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this.el.style.visibility = 'visible';
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};
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/**
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* Hide the progress bar.
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*/
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Progress.prototype.hide = function() {
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if (this.loading === this.loaded) {
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this.el.style.visibility = 'hidden';
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this.el.style.width = 0;
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}
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};
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var progress = new Progress(document.getElementById('progress'));
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var source = new ol.source.TileJSON({
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url: 'http://api.tiles.mapbox.com/v3/mapbox.world-bright.jsonp',
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crossOrigin: 'anonymous'
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});
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source.on('tileloadstart', function(event) {
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progress.addLoading();
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});
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source.on('tileloadend', function(event) {
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progress.addLoaded();
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});
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source.on('tileloaderror', function(event) {
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progress.addLoaded();
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});
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var map = new ol.Map({
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logo: false,
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layers: [
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new ol.layer.Tile({source: source})
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],
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renderer: exampleNS.getRendererFromQueryString(),
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target: 'map',
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view: new ol.View({
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center: [0, 0],
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zoom: 2
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})
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});
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