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| <html>
<head>
<title>FOAM API Example</title>
<script src="https://unpkg.com/deck.gl@^7.0.0/dist.min.js"></script>
<script src="https://unpkg.com/latlon-geohash@^1.1.0/latlon-geohash.js"></script>
<script src="https://api.tiles.mapbox.com/mapbox-gl-js/v0.50.0/mapbox-gl.js"></script>
<link href='https://api.tiles.mapbox.com/mapbox-gl-js/v1.0.0/mapbox-gl.css' rel='stylesheet' />
<style type="text/css">
body {
font-family: Helvetica, Arial, sans-serif;
width: 100vw;
height: 100vh;
margin: 0;
}
#control-panel {
position: absolute;
top: 0;
left: 0;
margin: 12px;
padding: 20px;
font-size: 12px;
line-height: 1.5;
z-index: 1;
background: #fff;
font-family: Helvetica, Arial, sans-serif;
box-shadow: 0 0 4px rgba(0, 0, 0, 0.15);
}
label {
display: inline-block;
width: 140px;
}
</style>
</head>
<body>
<div id="control-panel">
<div>
<label>Radius</label>
<input id="radius" type="range" min="1000" max="20000" step="1000" value="4000"></input>
<span id="radius-value"></span>
</div>
<div>
<label>Coverage</label>
<input id="coverage" type="range" min="0" max="1" step="0.1" value="1"></input>
<span id="coverage-value"></span>
</div>
<div>
<label>Upper Percentile</label>
<input id="upperPercentile" type="range" min="90" max="100" step="1" value="100"></input>
<span id="upperPercentile-value"></span>
</div>
</div>
</body>
<script type="text/javascript">
const {DeckGL, HexagonLayer} = deck;
// Map
const BOUNDING_BOX = [
[-5.96, 49.83],
[1.87, 55.24]
];
const INITIAL_ZOOM = 6;
const MIN_ZOOM = 5;
const MAX_ZOOM = 15;
// Functions
function getCenterPoint(bounding_box) {
return [(bounding_box[0][0] + bounding_box[1][0]) / 2, (bounding_box[0][1] + bounding_box[1][1]) / 2];
}
function getPointCoords(geohash) {
coords = Geohash.decode(geohash);
return [coords['lon'], coords['lat'], 0];
}
const deckgl = new DeckGL({
mapboxApiAccessToken: '<mapbox-access-token>', // Replace with your Mapbox access token
mapStyle: 'mapbox://styles/mapbox/dark-v9',
longitude: getCenterPoint(BOUNDING_BOX)[0],
latitude: getCenterPoint(BOUNDING_BOX)[1],
zoom: INITIAL_ZOOM,
minZoom: MIN_ZOOM,
maxZoom: MAX_ZOOM,
pitch: 40.5
});
let data = [];
const OPTIONS = ['radius', 'coverage', 'upperPercentile'];
const COLOR_RANGE = [
[1, 152, 189],
[73, 227, 206],
[216, 254, 181],
[254, 237, 177],
[254, 173, 84],
[209, 55, 78]
];
OPTIONS.forEach(key => {
document.getElementById(key).oninput = renderLayer;
});
function renderLayer () {
const options = {};
OPTIONS.forEach(key => {
const value = document.getElementById(key).value;
document.getElementById(key + '-value').innerHTML = value;
options[key] = Number(value);
});
const hexagonLayer = new HexagonLayer({
id: 'heatmap',
colorRange: COLOR_RANGE,
data,
elevationRange: [0, 1000],
elevationScale: 250,
extruded: true,
getPosition: d => d,
opacity: 1,
...options
});
deckgl.setProps({
layers: [hexagonLayer]
});
}
fetchPoints(100, 0);
function fetchPoints(limit, offset) {
fetch('https://map-api-direct.foam.space/poi/filtered?swLng=' + BOUNDING_BOX[0][0] + '&swLat=' + BOUNDING_BOX[0][1] + '&neLng=' + BOUNDING_BOX[1][0] + '&neLat=' + BOUNDING_BOX[1][1] + '&status=application&status=listing&sort=most_value&limit=' + limit + '&offset=' + offset)
.then(result => result.json())
.then(json => {
json.forEach(function(record) {
data.push(getPointCoords(record.geohash));
});
offset += json.length
if (json.length === limit) {
fetchPoints(limit, offset)
} else {
renderLayer();
}
});
}
</script>
</html>
|