Add an example showing the use of ol.style.Style#geometry
This commit is contained in:
Andreas Hocevar
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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>Earthquake Clusters</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>
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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">Earthquake Clusters</h4>
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<p id="shortdesc">Demonstrates the use of style geometries to render source features of a cluster.</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 clusters on a vector layer. The styling in this example is quite involved. Single earthquake locations (rendered as stars) have a size relative to their magnitude. Clusters have an opacity relative to the number of features in the cluster, and a size that represents the extent of the features that make up the cluster. When clicking or hovering on a cluster, the individual features that make up the cluster will be shown.
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</p>
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<p>To achieve this, we make heavy use of style functions and <code>ol.style.Style#geometry</code>. See the <a href="earthquake-clusters.js" target="_blank">earthquake-clusters.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, geometry, cluster</div>
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</div>
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</div>
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</div>
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<script src="../resources/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="../resources/example-behaviour.js" type="text/javascript"></script>
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<script src="loader.js?id=earthquake-clusters" type="text/javascript"></script>
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</body>
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</html>
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goog.require('ol.Map');
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goog.require('ol.View');
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goog.require('ol.extent');
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goog.require('ol.interaction');
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goog.require('ol.interaction.Select');
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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.Cluster');
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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.RegularShape');
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goog.require('ol.style.Stroke');
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goog.require('ol.style.Style');
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goog.require('ol.style.Text');
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var earthquakeFill = new ol.style.Fill({
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color: 'rgba(255, 153, 0, 0.8)'
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});
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var earthquakeStroke = 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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var textFill = new ol.style.Fill({
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color: '#fff'
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});
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var textStroke = new ol.style.Stroke({
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color: 'rgba(0, 0, 0, 0.6)',
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width: 3
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});
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var invisibleFill = new ol.style.Fill({
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color: 'rgba(255, 255, 255, 0.01)'
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});
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function createEarthquakeStyle(feature) {
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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
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// from 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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return new ol.style.Style({
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geometry: feature.getGeometry(),
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image: new ol.style.RegularShape({
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radius1: radius,
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radius2: 3,
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points: 5,
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angle: Math.PI,
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fill: earthquakeFill,
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stroke: earthquakeStroke
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})
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});
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}
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var maxFeatureCount;
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function calculateClusterInfo(resolution) {
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maxFeatureCount = 0;
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var features = vector.getSource().getFeatures();
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var feature, radius;
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for (var i = features.length - 1; i >= 0; --i) {
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feature = features[i];
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var originalFeatures = feature.get('features');
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var extent = ol.extent.createEmpty();
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for (var j = 0, jj = originalFeatures.length; j < jj; ++j) {
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ol.extent.extendCoordinate(extent,
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originalFeatures[j].getGeometry().getCoordinates());
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}
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maxFeatureCount = Math.max(maxFeatureCount, jj);
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radius = 0.25 * (ol.extent.getWidth(extent) + ol.extent.getHeight(extent)) /
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resolution;
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feature.set('radius', radius);
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}
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}
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var currentResolution;
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function styleFunction(feature, resolution) {
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if (resolution != currentResolution) {
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calculateClusterInfo(resolution);
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currentResolution = resolution;
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}
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var style;
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var size = feature.get('features').length;
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if (size > 1) {
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style = [new ol.style.Style({
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image: new ol.style.Circle({
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radius: feature.get('radius'),
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fill: new ol.style.Fill({
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color: [255, 153, 0, Math.min(0.8, 0.4 + (size / maxFeatureCount))]
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})
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}),
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text: new ol.style.Text({
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text: size.toString(),
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fill: textFill,
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stroke: textStroke
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})
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})];
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} else {
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var originalFeature = feature.get('features')[0];
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style = [createEarthquakeStyle(originalFeature)];
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}
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return style;
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}
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function selectStyleFunction(feature, resolution) {
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var styles = [new ol.style.Style({
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image: new ol.style.Circle({
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radius: feature.get('radius'),
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fill: invisibleFill
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})
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})];
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var originalFeatures = feature.get('features');
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var originalFeature;
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for (var i = originalFeatures.length - 1; i >= 0; --i) {
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originalFeature = originalFeatures[i];
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styles.push(createEarthquakeStyle(originalFeature));
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}
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return styles;
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}
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var vector = new ol.layer.Vector({
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source: new ol.source.Cluster({
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distance: 40,
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source: new ol.source.KML({
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extractStyles: false,
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projection: 'EPSG:3857',
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url: 'data/kml/2012_Earthquakes_Mag5.kml'
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})
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}),
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style: 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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interactions: ol.interaction.defaults().extend([new ol.interaction.Select({
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condition: function(evt) {
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return evt.originalEvent.type == 'mousemove' ||
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evt.type == 'singleclick';
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},
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style: selectStyleFunction
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})]),
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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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