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May 8, 2018 12:39
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CARTO.js v4: Tile aggregation cluster of points
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta name="viewport" content="initial-scale=1.0" /> | |
| <meta charset="utf-8" /> | |
| <!-- Include Carto.js --> | |
| <script src="https://cartodb-libs.global.ssl.fastly.net/carto.js/v4.0.2/carto.min.js"></script> | |
| <!-- Include Leaflet --> | |
| <script src="https://unpkg.com/leaflet@1.2.0/dist/leaflet.js"></script> | |
| <link href="https://unpkg.com/leaflet@1.2.0/dist/leaflet.css" rel="stylesheet" /> | |
| <style> | |
| body { | |
| margin: 0; | |
| padding: 0; | |
| } | |
| #map { | |
| position: absolute; | |
| height: 100%; | |
| width: 100%; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <div id="map"></div> | |
| <script> | |
| const map = L.map('map').setView([30, 0], 3); | |
| L.tileLayer('https://{s}.basemaps.cartocdn.com/rastertiles/voyager_nolabels/{z}/{x}/{y}.png', { | |
| maxZoom: 18 | |
| }).addTo(map); | |
| // define client | |
| const client = new carto.Client({ | |
| apiKey: 'default_public', | |
| username: 'oboix' | |
| }); | |
| // define source of data using a SQL query | |
| const source = new carto.source.SQL(` | |
| select *, 1 as count from stormevents_locations_2014 | |
| `); | |
| // Aggregation option | |
| const aggregation = new carto.layer.Aggregation({ | |
| threshold: 1, | |
| resolution: 32, | |
| placement: carto.layer.Aggregation.placement.SAMPLE, | |
| columns: { | |
| total_agg: { | |
| aggregateFunction: carto.layer.Aggregation.operation.SUM, | |
| aggregatedColumn: "count" | |
| } | |
| } | |
| }); | |
| // define CartoCSS code to style data on map | |
| const style = new carto.style.CartoCSS(` | |
| #layer { | |
| marker-fill: red; | |
| marker-width: ramp([total_agg], 5,20 , quantiles); | |
| } | |
| #layer::labels { | |
| text-name: [total_agg]; | |
| text-face-name: 'DejaVu Sans Book'; | |
| text-size: 10; | |
| text-fill: #FFFFFF; | |
| text-label-position-tolerance: 0; | |
| text-halo-radius: 1; | |
| text-halo-fill: #6F808D; | |
| text-allow-overlap: true; | |
| text-placement: point; | |
| text-placement-type: dummy; | |
| } | |
| `); | |
| // create CARTO layer from source and style variables | |
| // and defining the interactivity of columns | |
| // when featureOver and featureClick events are executed | |
| const cartolayer = new carto.layer.Layer(source, style, { aggregation }); | |
| // add CARTO layer to the client | |
| client.addLayer(cartolayer); | |
| // get tile from client and add them to the map object | |
| client.getLeafletLayer().addTo(map); | |
| </script> | |
| </body> | |
| </html> |
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