Add kml-earthquakes example
This commit is contained in:
Tom Payne
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examples/kml-earthquakes.html
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examples/kml-earthquakes.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="../css/ol.css" type="text/css">
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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>Earthquakes in KML</title>
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<style>
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#map {
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position: relative;
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}
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#info {
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position: absolute;
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height: 1px;
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width: 1px;
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z-index: 100;
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}
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.tooltip.in {
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opacity: 1;
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filter: alpha(opacity=100);
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}
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.tooltip.top .tooltip-arrow {
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border-top-color: white;
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}
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.tooltip-inner {
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border: 2px solid white;
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}
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</style>
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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="./"><img src="../resources/logo.png"> OpenLayers 3 Examples</a>
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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 id="info"></div></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="span12">
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<h4 id="title">Earthquakes in KML</h4>
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<p id="shortdesc">Demonstrates the use of a Shape symbolizer to render earthquake locations.</p>
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<div id="docs">
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<p>
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This example parses a KML file and renders the features as a vector layer. The layer is given a <code>styleFunction</code> that renders earthquake locations with a size relative to their magnitude.
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</p>
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<p>See the <a href="kml-earthquakes.js" target="_blank">kml-earthquakes.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="jquery.min.js" type="text/javascript"></script>
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<script src="../resources/bootstrap/js/bootstrap.min.js" type="text/javascript"></script>
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<script src="loader.js?id=kml-earthquakes" type="text/javascript"></script>
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<script src="../resources/example-behaviour.js" type="text/javascript"></script>
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</body>
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</html>
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96
examples/kml-earthquakes.js
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96
examples/kml-earthquakes.js
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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.Tile');
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goog.require('ol.layer.Vector');
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goog.require('ol.source.KML');
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goog.require('ol.source.Stamen');
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goog.require('ol.style.Circle');
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goog.require('ol.style.Fill');
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goog.require('ol.style.Stroke');
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goog.require('ol.style.Style');
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var styleCache = {};
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var styleFunction = function(feature, resolution) {
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// 2012_Earthquakes_Mag5.kml stores the magnitude of each earthquake in a
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// standards-violating <magnitude> tag in each Placemark. We extract it from
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// the Placemark's name instead.
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var name = feature.get('name');
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var magnitude = parseFloat(name.substr(2));
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var radius = 5 + 20 * (magnitude - 5);
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var style = styleCache[radius];
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if (!style) {
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style = [new ol.style.Style({
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image: new ol.style.Circle({
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radius: radius,
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fill: new ol.style.Fill({
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color: 'rgba(255, 153, 0, 0.4)'
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}),
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stroke: new ol.style.Stroke({
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color: 'rgba(255, 204, 0, 0.2)',
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width: 1
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})
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})
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})];
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styleCache[radius] = style;
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}
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return style;
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};
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var vector = new ol.layer.Vector({
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source: new ol.source.KML({
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reprojectTo: 'EPSG:3857',
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url: 'data/kml/2012_Earthquakes_Mag5.kml'
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}),
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styleFunction: styleFunction
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});
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var raster = new ol.layer.Tile({
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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 info = $('#info');
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info.tooltip({
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animation: false,
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trigger: 'manual'
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});
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var displayFeatureInfo = function(evt) {
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var pixel = map.getEventPixel(evt.originalEvent);
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info.css({
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left: pixel[0] + 'px',
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top: (pixel[1] - 15) + 'px'
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});
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var feature = map.forEachFeatureAtPixel(pixel, function(feature, layer) {
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return feature;
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});
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if (feature) {
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info.tooltip('hide')
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.attr('data-original-title', feature.get('name'))
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.tooltip('fixTitle')
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.tooltip('show');
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} else {
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info.tooltip('hide');
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}
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};
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$(map.getViewport()).on('mousemove', function(evt) {
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displayFeatureInfo(evt);
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});
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map.on('singleclick', function(evt) {
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displayFeatureInfo(evt);
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});
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