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<html>
<head>
<!-- FONT -->
<link
href="https://fonts.googleapis.com/css2?family=Open+Sans:wght@400;600&display=swap"
rel="stylesheet"
/>
<script src="https://unpkg.com/deck.gl@^8.8.0/dist.min.js"></script>
<script src="https://unpkg.com/@deck.gl/carto@^8.8.0/dist.min.js"></script>
<script src="https://unpkg.com/maplibre-gl@2.1.9/dist/maplibre-gl.js"></script>
<link href="https://unpkg.com/maplibre-gl@2.1.9/dist/maplibre-gl.css" rel="stylesheet" />
</head>
<body style="margin: 0; padding: 0; font-family: 'Open Sans', Helvetica, sans-serif;">
<div id="map" style="width: 100vw; height: 100vh;"></div>
</body>
<script type="text/javascript">
deck.carto.setDefaultCredentials({
username: 'public',
apiKey: 'default_public',
apiVersion: deck.carto.API_VERSIONS.V2,
});
let zoom = 1.5;
let deckgl;
const renderLayer = () => {
const layer = new deck.carto.CartoLayer({
id: 'world_population',
type: deck.carto.MAP_TYPES.QUERY,
data: `SELECT the_geom_webmercator, country_name, continent_name, pop_2015
FROM world_population_2015
ORDER BY pop_2015 DESC`,
opacity: 0.7,
getFillColor: deck.carto.colorCategories({
attr: 'continent_name',
domain: [
'Africa',
'Asia',
'Europe',
'North America',
'Oceania',
'South America'
],
colors: [
[117, 68, 92],
[175, 100, 88],
[213, 167, 91],
[115, 111, 76],
[91, 120, 142],
[76, 78, 143]
]
}),
getLineColor: [255, 255, 255, 204],
pointRadiusUnits: 'pixels',
getPointRadius: (d) => {
// Proportional symbol map + zoom based styling
// Maximum symbol size: 30 px * zoom level
// Maximum population square root (China): 27620.2642999664
return 30.0 * zoom * Math.sqrt(d.properties.pop_2015) / 27620.2642999664;
},
lineWidthMinPixels: 1,
updateTriggers: {
getPointRadius: [zoom]
},
pickable: true,
});
deckgl.setProps({
layers: [layer]
});
};
deckgl = new deck.DeckGL({
container: 'map',
map: maplibregl,
mapStyle: deck.carto.BASEMAP.VOYAGER,
initialViewState: {
latitude: 15,
longitude: 10,
zoom: zoom,
},
controller: true,
onViewStateChange: ({viewState}) => {
zoom = viewState.zoom;
renderLayer();
},
getTooltip: ({ object }) => {
if (!object) return false;
return {
html: `${object.properties.country_name}: ${object.properties.pop_2015}`,
};
},
});
</script>
</html>
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