VictorVelarde · June 13, 2019 16:38
diff --git a/index.html b/index.html
 <!DOCTYPE html>
 <html>

 <head>
  <title>Clusters PoC | CARTO & MGL</title>
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta charset="UTF-8">

  <script src="https://libs.cartocdn.com/carto-vl/v1.3/carto-vl.min.js"></script>

  <script src="https://api.tiles.mapbox.com/mapbox-gl-js/v1.0.0/mapbox-gl.js"></script>
  <link href="https://api.tiles.mapbox.com/mapbox-gl-js/v1.0.0/mapbox-gl.css" rel="stylesheet" />

  <link href="https://carto.com/developers/carto-vl/v1.3.0/examples/maps/style.css" rel="stylesheet">
 </head>

 <body>
  <div id="map"></div>

  <script>
    const map = new mapboxgl.Map({
      container: 'map',
      style: carto.basemaps.voyager,
      center: [7, 25],
      zoom: 2,
      renderWorldCopies: false
    });

    const nav = new mapboxgl.NavigationControl();
    map.addControl(nav, 'top-left');

    //** CARTO VL functionality begins here **//

    carto.setDefaultAuth({
      user: 'cartovl',
      apiKey: 'default_public'
    });

    // Points layer
    const source = new carto.source.Dataset('airbnb_madrid_listings_2018');

    // Auxiliary viz, to get the clusters
    const viz = new carto.Viz(`
      color: opacity(ramp(buckets($room_type, ['Entire home/apt', 'Private room', 'Shared room']), [red, green, blue]), 0.5)
      strokeColor: transparent
      width: 2
      @cc: clusterCount()
      @v_features: viewportFeatures($cartodb_id, $room_type)
      resolution: 8
    `);
    const layer = new carto.Layer('points', source, viz);
    const interactivity = new carto.Interactivity([layer],
      { autoChangePointer: false }
    );
    interactivity.on('featureClick', e => {
      const f = e.features[0];
      if (f) {
        const type = f._rawFeature.room_type;
        const count = f._rawFeature._cdb_feature_count
        console.log(count, type);
      }
    });

    // Client-cluster layer
    const entire = ['==', ['get', 'room_type'], 'Entire home/apt'];
    const private = ['==', ['get', 'room_type'], 'Private room'];
    const shared = ['==', ['get', 'room_type'], 'Shared room'];


    layer.on('loaded', () => {
      map.addSource('clusters', {
        type: 'geojson',
        data: null,
        cluster: true,
        clusterRadius: 64,
        clusterProperties: {
          'entire': ['+', ['case', entire, ['get', 'room_count'], 0]],
          'private': ['+', ['case', private, ['get', 'room_count'], 0]],
          'shared': ['+', ['case', shared, ['get', 'room_count'], 0]],
        }
      });
      const clustersSource = map.getSource('clusters');

      const layerUpdated = function () {
        const features = viz.variables.v_features.value;
        const geojsonFeatures = features.map(f => {

          const type = f.properties['room_type'];
          const count = f._rawFeature._cdb_feature_count;

          return {
            "type": "Feature",
            "geometry": {
              "type": "Point",
              "coordinates": f.getRenderedCentroid()
            },
            "properties": {
              "room_type": `${type}`,
              "room_count": count,
            }
          }
        });

        clustersSource.setData({
          type: 'FeatureCollection',
          features: geojsonFeatures
        });
        // console.log('* clusters updated');
      };

      layer.on('updated', layerUpdated);

      map.addLayer({
        "id": "clusters_layer",
        "type": "circle",
        "source": "clusters",
        "filter": ["!=", "cluster", true],
        "paint": {
          "circle-color": ["case",
            entire, '#f00',
            private, '#0f0',
            shared, '#00f', '#444'
          ],
          "circle-opacity": 0.6,
          "circle-radius": 12
        }
      });


      // objects for caching and keeping track of HTML marker objects (for performance)
      var markers = {};
      var markersOnScreen = {};

      function updateMarkers() {
        var newMarkers = {};
        var features = map.querySourceFeatures('clusters');

        // for every cluster on the screen, create an HTML marker for it (if we didn't yet),
        // and add it to the map if it's not there already
        for (var i = 0; i < features.length; i++) {
          var coords = features[i].geometry.coordinates;
          var props = features[i].properties;

          // if (!props.cluster) continue;
          var id = props.cluster_id;

          var marker = markers[id];
          if (!marker) {
            var el = createDonutChart(props);
            marker = markers[id] = new mapboxgl.Marker({ element: el }).setLngLat(coords);
          }
          newMarkers[id] = marker;

          if (!markersOnScreen[id])
            marker.addTo(map);
        }
        // for every marker we've added previously, remove those that are no longer visible
        for (id in markersOnScreen) {
          if (!newMarkers[id])
            markersOnScreen[id].remove();
        }
        markersOnScreen = newMarkers;
      }

      // after the GeoJSON data is loaded, update markers on the screen and do so on every map move/moveend
      map.on('data', function (e) {
        if (e.sourceId !== 'clusters' || !e.isSourceLoaded) return;

        map.on('move', updateMarkers);
        map.on('moveend', updateMarkers);
        updateMarkers();
      });



    });

    layer.addTo(map);

    // Chart
    // code for creating an SVG donut chart from feature properties
    const colors = ['#f00', '#0f0', '#00f'];
    function createDonutChart(props) {
      var offsets = [];
      var counts = [props.entire, props.private, props.shared];
      var total = 0;
      for (var i = 0; i < counts.length; i++) {
        offsets.push(total);
        total += counts[i];
      }
      var fontSize = total >= 1000 ? 22 : total >= 100 ? 20 : total >= 10 ? 18 : 16;
      var r = total >= 1000 ? 50 : total >= 100 ? 32 : total >= 10 ? 24 : 18;
      var r0 = Math.round(r * 0.6);
      var w = r * 2;

      var html = '<svg width="' + w + '" height="' + w + '" viewbox="0 0 ' + w + ' ' + w +
        '" text-anchor="middle" style="font: ' + fontSize + 'px sans-serif">';

      for (i = 0; i < counts.length; i++) {
        html += donutSegment(offsets[i] / total, (offsets[i] + counts[i]) / total, r, r0, colors[i]);
      }
      html += '<circle cx="' + r + '" cy="' + r + '" r="' + r0 +
        '" fill="white" /><text dominant-baseline="central" transform="translate(' +
        r + ', ' + r + ')">' + total.toLocaleString() + '</text></svg>';

      var el = document.createElement('div');
      el.innerHTML = html;
      return el.firstChild;
    }

    function donutSegment(start, end, r, r0, color) {
      if (end - start === 1) end -= 0.00001;
      var a0 = 2 * Math.PI * (start - 0.25);
      var a1 = 2 * Math.PI * (end - 0.25);
      var x0 = Math.cos(a0), y0 = Math.sin(a0);
      var x1 = Math.cos(a1), y1 = Math.sin(a1);
      var largeArc = end - start > 0.5 ? 1 : 0;

      return ['<path d="M', r + r0 * x0, r + r0 * y0, 'L', r + r * x0, r + r * y0,
        'A', r, r, 0, largeArc, 1, r + r * x1, r + r * y1,
        'L', r + r0 * x1, r + r0 * y1, 'A',
        r0, r0, 0, largeArc, 0, r + r0 * x0, r + r0 * y0,
        '" fill="' + color + '" />'].join(' ');
    }

  </script>

 </body>

 </html>
	<!DOCTYPE html>
	<html>

	<head>
	<title>Clusters PoC \| CARTO & MGL</title>
	<meta name="viewport" content="width=device-width, initial-scale=1.0">
	<meta charset="UTF-8">

	<script src="https://libs.cartocdn.com/carto-vl/v1.3/carto-vl.min.js"></script>

	<script src="https://api.tiles.mapbox.com/mapbox-gl-js/v1.0.0/mapbox-gl.js"></script>
	<link href="https://api.tiles.mapbox.com/mapbox-gl-js/v1.0.0/mapbox-gl.css" rel="stylesheet" />

	<link href="https://carto.com/developers/carto-vl/v1.3.0/examples/maps/style.css" rel="stylesheet">
	</head>

	<body>
	<div id="map"></div>

	<script>
	const map = new mapboxgl.Map({
	container: 'map',
	style: carto.basemaps.voyager,
	center: [7, 25],
	zoom: 2,
	renderWorldCopies: false
	});

	const nav = new mapboxgl.NavigationControl();
	map.addControl(nav, 'top-left');

	// CARTO VL functionality begins here //

	carto.setDefaultAuth({
	user: 'cartovl',
	apiKey: 'default_public'
	});

	// Points layer
	const source = new carto.source.Dataset('airbnb_madrid_listings_2018');

	// Auxiliary viz, to get the clusters
	const viz = new carto.Viz(`
	color: opacity(ramp(buckets($room_type, ['Entire home/apt', 'Private room', 'Shared room']), [red, green, blue]), 0.5)
	strokeColor: transparent
	width: 2
	@cc: clusterCount()
	@v_features: viewportFeatures($cartodb_id, $room_type)
	resolution: 8
	`);
	const layer = new carto.Layer('points', source, viz);
	const interactivity = new carto.Interactivity([layer],
	{ autoChangePointer: false }
	);
	interactivity.on('featureClick', e => {
	const f = e.features[0];
	if (f) {
	const type = f._rawFeature.room_type;
	const count = f._rawFeature._cdb_feature_count
	console.log(count, type);
	}
	});

	// Client-cluster layer
	const entire = ['==', ['get', 'room_type'], 'Entire home/apt'];
	const private = ['==', ['get', 'room_type'], 'Private room'];
	const shared = ['==', ['get', 'room_type'], 'Shared room'];


	layer.on('loaded', () => {
	map.addSource('clusters', {
	type: 'geojson',
	data: null,
	cluster: true,
	clusterRadius: 64,
	clusterProperties: {
	'entire': ['+', ['case', entire, ['get', 'room_count'], 0]],
	'private': ['+', ['case', private, ['get', 'room_count'], 0]],
	'shared': ['+', ['case', shared, ['get', 'room_count'], 0]],
	}
	});
	const clustersSource = map.getSource('clusters');

	const layerUpdated = function () {
	const features = viz.variables.v_features.value;
	const geojsonFeatures = features.map(f => {

	const type = f.properties['room_type'];
	const count = f._rawFeature._cdb_feature_count;

	return {
	"type": "Feature",
	"geometry": {
	"type": "Point",
	"coordinates": f.getRenderedCentroid()
	},
	"properties": {
	"room_type": `${type}`,
	"room_count": count,
	}
	}
	});

	clustersSource.setData({
	type: 'FeatureCollection',
	features: geojsonFeatures
	});
	// console.log('* clusters updated');
	};

	layer.on('updated', layerUpdated);

	map.addLayer({
	"id": "clusters_layer",
	"type": "circle",
	"source": "clusters",
	"filter": ["!=", "cluster", true],
	"paint": {
	"circle-color": ["case",
	entire, '#f00',
	private, '#0f0',
	shared, '#00f', '#444'
	],
	"circle-opacity": 0.6,
	"circle-radius": 12
	}
	});


	// objects for caching and keeping track of HTML marker objects (for performance)
	var markers = {};
	var markersOnScreen = {};

	function updateMarkers() {
	var newMarkers = {};
	var features = map.querySourceFeatures('clusters');

	// for every cluster on the screen, create an HTML marker for it (if we didn't yet),
	// and add it to the map if it's not there already
	for (var i = 0; i < features.length; i++) {
	var coords = features[i].geometry.coordinates;
	var props = features[i].properties;

	// if (!props.cluster) continue;
	var id = props.cluster_id;

	var marker = markers[id];
	if (!marker) {
	var el = createDonutChart(props);
	marker = markers[id] = new mapboxgl.Marker({ element: el }).setLngLat(coords);
	}
	newMarkers[id] = marker;

	if (!markersOnScreen[id])
	marker.addTo(map);
	}
	// for every marker we've added previously, remove those that are no longer visible
	for (id in markersOnScreen) {
	if (!newMarkers[id])
	markersOnScreen[id].remove();
	}
	markersOnScreen = newMarkers;
	}

	// after the GeoJSON data is loaded, update markers on the screen and do so on every map move/moveend
	map.on('data', function (e) {
	if (e.sourceId !== 'clusters' \|\| !e.isSourceLoaded) return;

	map.on('move', updateMarkers);
	map.on('moveend', updateMarkers);
	updateMarkers();
	});



	});

	layer.addTo(map);

	// Chart
	// code for creating an SVG donut chart from feature properties
	const colors = ['#f00', '#0f0', '#00f'];
	function createDonutChart(props) {
	var offsets = [];
	var counts = [props.entire, props.private, props.shared];
	var total = 0;
	for (var i = 0; i < counts.length; i++) {
	offsets.push(total);
	total += counts[i];
	}
	var fontSize = total >= 1000 ? 22 : total >= 100 ? 20 : total >= 10 ? 18 : 16;
	var r = total >= 1000 ? 50 : total >= 100 ? 32 : total >= 10 ? 24 : 18;
	var r0 = Math.round(r * 0.6);
	var w = r * 2;

	var html = '<svg width="' + w + '" height="' + w + '" viewbox="0 0 ' + w + ' ' + w +
	'" text-anchor="middle" style="font: ' + fontSize + 'px sans-serif">';

	for (i = 0; i < counts.length; i++) {
	html += donutSegment(offsets[i] / total, (offsets[i] + counts[i]) / total, r, r0, colors[i]);
	}
	html += '<circle cx="' + r + '" cy="' + r + '" r="' + r0 +
	'" fill="white" /><text dominant-baseline="central" transform="translate(' +
	r + ', ' + r + ')">' + total.toLocaleString() + '</text></svg>';

	var el = document.createElement('div');
	el.innerHTML = html;
	return el.firstChild;
	}

	function donutSegment(start, end, r, r0, color) {
	if (end - start === 1) end -= 0.00001;
	var a0 = 2 * Math.PI * (start - 0.25);
	var a1 = 2 * Math.PI * (end - 0.25);
	var x0 = Math.cos(a0), y0 = Math.sin(a0);
	var x1 = Math.cos(a1), y1 = Math.sin(a1);
	var largeArc = end - start > 0.5 ? 1 : 0;

	return ['<path d="M', r + r0 * x0, r + r0 * y0, 'L', r + r * x0, r + r * y0,
	'A', r, r, 0, largeArc, 1, r + r * x1, r + r * y1,
	'L', r + r0 * x1, r + r0 * y1, 'A',
	r0, r0, 0, largeArc, 0, r + r0 * x0, r + r0 * y0,
	'" fill="' + color + '" />'].join(' ');
	}

	</script>

	</body>

	</html>