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AzureMapsGovCloudCodeSamples/AzureMapsCodeSamples/Symbol Layer/Expanding Spider Clusters.html

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<!DOCTYPE html>
<html lang="en">
<head>
<title>Expanding Spider Clusters - Azure Maps Web SDK Samples</title>
<meta charset="utf-8" />
<link rel="shortcut icon" href="/favicon.ico"/>
<meta http-equiv="x-ua-compatible" content="IE=Edge" />
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no" />
<meta name="description" content="This sample shows how to visualize the contents of a cluster as a expanded spider cluster layout." />
<meta name="keywords" content="Microsoft maps, map, gis, API, SDK, markers, pins, pushpins, symbols, layer, bubbles, clustering, superclusterer, spider" />
<meta name="author" content="Microsoft Azure Maps" />
<!-- Add references to the Azure Maps Map control JavaScript and CSS files. -->
<link rel="stylesheet" href="https://atlas.microsoft.com/sdk/javascript/mapcontrol/2/atlas.min.css" type="text/css" />
<script src="https://atlas.microsoft.com/sdk/javascript/mapcontrol/2/atlas.min.js"></script>
<!-- Load the code for the Spider Cluster Manager. -->
<script src="../Common/scripts/azure-maps-spider-clusters.min.js"></script>
<script type='text/javascript'>
var map, datasource, popup, spiderManager;
function GetMap() {
//Point the Azure Maps domain to the US Azure Gov Cloud domain.
atlas.setDomain('atlas.azure.us');
//Initialize a map instance.
map = new atlas.Map('myMap', {
center: [-110, 50],
zoom: 2,
view: 'Auto',
//Add authentication details for connecting to Azure Maps.
authOptions: {
//Use Azure Active Directory authentication.
authType: 'anonymous',
clientId: 'c9f2f391-13f1-407b-a4a5-f0a241bacfbf', //Your Azure Active Directory client id for accessing your Azure Maps account.
getToken: function (resolve, reject, map) {
//URL to your authentication service that retrieves an Azure Active Directory Token.
var tokenServiceUrl = 'https://azuremapscodesamples.azurewebsites.us/Common/TokenService.ashx';
fetch(tokenServiceUrl).then(r => r.text()).then(token => resolve(token));
}
//Alternatively, use an Azure Maps key. Get an Azure Maps key at https://azure.com/maps. NOTE: The primary key should be used as the key.
//authType: 'subscriptionKey',
//subscriptionKey: '<Your Azure Maps Key>'
}
});
//Wait until the map resources are ready.
map.events.add('ready', function () {
//Create a popup.
popup = new atlas.Popup();
//Hide popup when user clicks or moves the map.
map.events.add('click', hidePopup);
map.events.add('movestart', hidePopup);
//Create a data source to add your data to.
datasource = new atlas.source.DataSource(null, {
//Tell the data source to cluster point data.
cluster: true,
//The radius in pixels to cluster points together.
clusterRadius: 45,
//The maximium zoom level in which clustering occurs.
//If you zoom in more than this, all points are rendered as symbols.
clusterMaxZoom: 15
});
map.sources.add(datasource);
//Load some point data into the data source.
datasource.importDataFromUrl('../Common/data/geojson/SamplePoiDataSet.json');
//Create a layer for rendering clustered data in the data source.
var clusterBubbleLayer = new atlas.layer.BubbleLayer(datasource, null, {
//Scale the size of the clustered bubble based on the number of points inthe cluster.
radius: [
'step',
['get', 'point_count'],
20, //Default of 20 pixel radius.
100, 30, //If point_count >= 100, radius is 30 pixels.
750, 40 //If point_count >= 750, radius is 40 pixels.
],
//Change the color of the cluster based on the value on the point_cluster property of the cluster.
color: [
'step',
['get', 'point_count'],
'rgba(0,255,0,0.8)', //Default to green.
100, 'rgba(255,255,0,0.8)', //If the point_count >= 100, color is yellow.
750, 'rgba(255,0,0,0.8)' //If the point_count >= 100, color is red.
],
strokeWidth: 0,
blur: 0.5,
filter: ['has', 'point_count'] //Only rendered data points which have a point_count property, which clusters do.
});
//Create a layer to render the individual locations.
var shapeLayer = new atlas.layer.SymbolLayer(datasource, null, {
filter: ['!', ['has', 'point_count']] //Filter out clustered points from this layer.
});
//Add the clusterBubbleLayer and two additional layers to the map.
map.layers.add([
clusterBubbleLayer,
//Create a symbol layer to render the count of locations in a cluster.
new atlas.layer.SymbolLayer(datasource, null, {
iconOptions: {
image: 'none' //Hide the icon image.
},
textOptions: {
textField: '{point_count_abbreviated}',
offset: [0, 0.4]
}
}),
shapeLayer
]);
//Create an instance of the spider manager.
spiderManager = new atlas.SpiderClusterManager(map, clusterBubbleLayer, shapeLayer);
//Add event handler for when a feature is selected.
map.events.add('featureSelected', spiderManager, function(e) {
if (e.cluster) {
showPopup(e.cluster.geometry.coordinates, e.shape.getProperties(), [0, 0]);
} else {
showPopup(e.shape.getCoordinates(), e.shape.getProperties(), [0, -20]);
}
});
//Add event handler for when a feature is unselected.
map.events.add('featureUnselected', spiderManager, function() {
hidePopup();
});
});
}
function showPopup(position, properties, pixelOffset) {
popup.setOptions({
//Update the content of the popup.
content: atlas.PopupTemplate.applyTemplate(properties),
//Update the position of the popup with the symbols coordinate.
position: position,
//Offset the popups position for better alignment with the layer.
pixelOffset: pixelOffset
});
//Open the popup.
popup.open(map);
}
function hidePopup() {
popup.close();
}
</script>
</head>
<body onload="GetMap()">
<div id="myMap" style="position:relative;width:100%;min-width:290px;height:600px;"></div>
<fieldset style="width:calc(100% - 30px);min-width:290px;margin-top:10px;">
<legend><h1 style="font-size:16px">Expanding Spider Clusters</h1></legend>
This sample shows how to visualize the contents of a cluster as a expanded spider cluster layout.
If you click on a cluster, and it has less than 100 features in it, it will generate each individual location in the cluster
and layout it out in a spiral around the cluster, connected by a line.
This samples uses the open source <a href="https://github.com/Azure-Samples/azure-maps-spider-clusters" target="_blank">Azure Maps Spider Clusters module</a>.
</fieldset>
</body>
</html>