Adding a prettier KML example
This commit is contained in:
Tim Schaub
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examples/data/kml/timezones.kml
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examples/data/kml/timezones.kml
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examples/kml-timezones.html
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examples/kml-timezones.html
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<!doctype html>
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<html lang="en">
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<head>
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<meta charset="utf-8">
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<meta http-equiv="X-UA-Compatible" content="chrome=1">
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<meta name="viewport" content="initial-scale=1.0, user-scalable=no, width=device-width">
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<link rel="stylesheet" href="../resources/bootstrap/css/bootstrap.min.css" type="text/css">
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<link rel="stylesheet" href="../resources/layout.css" type="text/css">
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<link rel="stylesheet" href="../resources/bootstrap/css/bootstrap-responsive.min.css" type="text/css">
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<title>Timezones in KML</title>
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</head>
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<body>
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<div class="navbar navbar-inverse navbar-fixed-top">
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<div class="navbar-inner">
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<div class="container">
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<a class="brand" href="./">OpenLayers 3 Examples</a>
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<ul class="nav pull-right">
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<li><iframe class="github-watch-button" src="http://ghbtns.com/github-btn.html?user=openlayers&repo=ol3&type=watch&count=true"
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allowtransparency="true" frameborder="0" scrolling="0" height="20" width="90"></iframe></li>
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<li><a href="https://twitter.com/share" class="twitter-share-button" data-count="none" data-hashtags="openlayers"> </a></li>
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<li><div class="g-plusone-wrapper"><div class="g-plusone" data-size="medium" data-annotation="none"></div></div></li>
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</ul>
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</div>
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</div>
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</div>
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<div class="container-fluid">
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<div class="row-fluid">
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<div class="span12">
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<div id="map" class="map"></div>
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</div>
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</div>
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<div class="row-fluid">
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<div class="span4">
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<h4 id="title">Timezones in KML</h4>
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<p id="shortdesc">Demonstrates rendering timezones from KML.</p>
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<div id="docs">
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<p>This example parses a KML file and renders the features as a vector layer. Note that currently the <code>kml:StyleMap</code> elements are not parsed, so the layer is given a <code>ol.style.Style</code> manually. The timezones are filled yellow with an opacity calculated based on the current offset to local noon.</p>
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<p>See the <a href="kml-timezones.js" target="_blank">kml-timezones.js source</a> to see how this is done.</p>
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</div>
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<div id="tags">KML, vector, style</div>
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</div>
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</div>
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</div>
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<script src="loader.js?id=kml-timezones" type="text/javascript"></script>
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<script src="../resources/social-links.js" type="text/javascript"></script>
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</body>
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</html>
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examples/kml-timezones.js
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examples/kml-timezones.js
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goog.require('ol.Expression');
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goog.require('ol.Map');
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goog.require('ol.RendererHint');
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goog.require('ol.View2D');
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goog.require('ol.layer.TileLayer');
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goog.require('ol.layer.Vector');
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goog.require('ol.parser.KML');
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goog.require('ol.proj');
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goog.require('ol.source.Stamen');
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goog.require('ol.source.Vector');
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goog.require('ol.style.Polygon');
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goog.require('ol.style.Rule');
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goog.require('ol.style.Style');
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// calculate opacity based on difference from local noon
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function getOpacity(feature) {
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var opacity = 0;
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var name = feature.get('name'); // e.g. GMT -08:30
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var match = name.match(/([-+]\d{2}):(\d{2})$/);
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if (match) {
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var hours = parseInt(match[1], 10);
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var minutes = parseInt(match[2], 10);
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var date = new Date();
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var diff = 60 * hours + minutes + date.getTimezoneOffset();
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var remote = new Date(date.getTime() + diff * 60000);
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// offset from local noon (in hours)
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var offset = Math.abs(12 - remote.getHours() + (remote.getMinutes() / 60));
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if (offset > 12) {
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offset = 24 - offset;
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}
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opacity = 1 - offset / 12;
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}
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return opacity;
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}
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var style = new ol.style.Style({rules: [
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new ol.style.Rule({
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symbolizers: [
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new ol.style.Polygon({
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fillColor: '#ffff33',
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strokeColor: '#ffffff',
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opacity: new ol.Expression('getOpacity(this)')
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})
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]
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})
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]});
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var vector = new ol.layer.Vector({
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source: new ol.source.Vector({
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projection: ol.proj.get('EPSG:4326')
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}),
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style: style
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});
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var raster = new ol.layer.TileLayer({
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source: new ol.source.Stamen({
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layer: 'toner'
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})
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});
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var map = new ol.Map({
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layers: [raster, vector],
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renderer: ol.RendererHint.CANVAS,
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target: 'map',
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view: new ol.View2D({
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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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var kml = new ol.parser.KML({dimension: 2});
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var url = 'data/kml/timezones.kml';
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var xhr = new XMLHttpRequest();
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xhr.open('GET', url, true);
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/**
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* onload handler for the XHR request.
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*/
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xhr.onload = function() {
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if (xhr.status == 200) {
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var projection = map.getView().getProjection();
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vector.parseFeatures(xhr.responseText, kml, projection);
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}
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};
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xhr.send();
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