Display clusters with a Symbol layer.html

<!DOCTYPE html>
<html lang="en">
<head>
    <title>Display clusters with a Symbol Layer - 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 enable point based clustering on a data source and render them with different symbols." />
    <meta name="keywords" content="Microsoft maps, map, gis, API, SDK, markers, pins, pushpins, symbols, layer, clustering, superclusterer, earthquakes, USGS" />
    <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>

    <script type='text/javascript'>
        var map, datasource;

        //GeoJSON feed of all earthquakes from the past 30 days. Sourced from the USGS.
        var earthquakeFeed = "https://earthquake.usgs.gov/earthquakes/feed/v1.0/summary/all_month.geojson";

        //Find more earthquake data feeds here: https://earthquake.usgs.gov/earthquakes/feed/v1.0/geojson.php

        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: [-97, 39],
                zoom: 3,
                style: 'grayscale_dark',
                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 an array of custom icon promises to load into the map.
                var iconPromises = [
                    map.imageSprite.add('earthquake_icon', '../Common/images/icons/earthquake_icon.png'),
                    map.imageSprite.add('warning_triangle_icon', '../Common/images/icons/warning_triangle_icon.png')
                ];

                //Load all the custom image icons into the map resources.
                Promise.all(iconPromises).then(function () {

                    //Create a data source and add it to the map.
                    datasource = new atlas.source.DataSource(null, {
                        //Tell the data source to cluster point data.
                        cluster: true
                    });
                    map.sources.add(datasource);

                    //Add two symbol layers to the map, one for clusters, one for individual points.
                    map.layers.add([
                        //Create a symbol layer to render the clusters.
                        new atlas.layer.SymbolLayer(datasource, null, {
                            iconOptions: {
                                image: 'warning_triangle_icon'
                            },
                            textOptions: {
                                textField: ['get', 'point_count_abbreviated'],
                                offset: [0, -0.4]
                            }
                        }),

                        //Create a layer to render the individual locations.
                        new atlas.layer.SymbolLayer(datasource, null, {
                            iconOptions: {
                                image: 'earthquake_icon'
                            },
                            filter: ['!', ['has', 'point_count']] //Filter out clustered points from this layer.
                        })
                    ]);

                    //Retrieve a GeoJSON data set and add it to the data source.
                    datasource.importDataFromUrl(earthquakeFeed);
                });
            });
        }
    </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">Display clusters with a Symbol Layer</h1></legend>
        This sample shows how to enable point based clustering on a data source and render them with different symbols. Clustered points have four properties;

        <ul>
            <li>cluster - A boolean value indicating that it is a cluster.</li>
            <li>cluster_id - A unique id for the cluster which can be used with the DataSource getClusterExpansionZoom, getClusterChildren, and getClusterLeaves functions.</li>
            <li>point_count - The number of points the cluster contains.</li>
            <li>point_count_abbreviated - A string that abbreviates the point_count value if it is long. (i.e. 4,000 becomes 4K)</li>
        </ul>
    </fieldset>
</body>
</html>
	<!DOCTYPE html>
	<html lang="en">
	<head>
	<title>Display clusters with a Symbol Layer - 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 enable point based clustering on a data source and render them with different symbols." />
	<meta name="keywords" content="Microsoft maps, map, gis, API, SDK, markers, pins, pushpins, symbols, layer, clustering, superclusterer, earthquakes, USGS" />
	<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>

	<script type='text/javascript'>
	var map, datasource;

	//GeoJSON feed of all earthquakes from the past 30 days. Sourced from the USGS.
	var earthquakeFeed = "https://earthquake.usgs.gov/earthquakes/feed/v1.0/summary/all_month.geojson";

	//Find more earthquake data feeds here: https://earthquake.usgs.gov/earthquakes/feed/v1.0/geojson.php

	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: [-97, 39],
	zoom: 3,
	style: 'grayscale_dark',
	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 an array of custom icon promises to load into the map.
	var iconPromises = [
	map.imageSprite.add('earthquake_icon', '../Common/images/icons/earthquake_icon.png'),
	map.imageSprite.add('warning_triangle_icon', '../Common/images/icons/warning_triangle_icon.png')
	];

	//Load all the custom image icons into the map resources.
	Promise.all(iconPromises).then(function () {

	//Create a data source and add it to the map.
	datasource = new atlas.source.DataSource(null, {
	//Tell the data source to cluster point data.
	cluster: true
	});
	map.sources.add(datasource);

	//Add two symbol layers to the map, one for clusters, one for individual points.
	map.layers.add([
	//Create a symbol layer to render the clusters.
	new atlas.layer.SymbolLayer(datasource, null, {
	iconOptions: {
	image: 'warning_triangle_icon'
	},
	textOptions: {
	textField: ['get', 'point_count_abbreviated'],
	offset: [0, -0.4]
	}
	}),

	//Create a layer to render the individual locations.
	new atlas.layer.SymbolLayer(datasource, null, {
	iconOptions: {
	image: 'earthquake_icon'
	},
	filter: ['!', ['has', 'point_count']] //Filter out clustered points from this layer.
	})
	]);

	//Retrieve a GeoJSON data set and add it to the data source.
	datasource.importDataFromUrl(earthquakeFeed);
	});
	});
	}
	</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">Display clusters with a Symbol Layer</h1></legend>
	This sample shows how to enable point based clustering on a data source and render them with different symbols. Clustered points have four properties;

	<ul>
	<li>cluster - A boolean value indicating that it is a cluster.</li>
	<li>cluster_id - A unique id for the cluster which can be used with the DataSource getClusterExpansionZoom, getClusterChildren, and getClusterLeaves functions.</li>
	<li>point_count - The number of points the cluster contains.</li>
	<li>point_count_abbreviated - A string that abbreviates the point_count value if it is long. (i.e. 4,000 becomes 4K)</li>
	</ul>
	</fieldset>
	</body>
	</html>