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FergusDevelopmentLLC/mapbox-aws.html

Created March 2, 2021 22:30
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mapbox-aws.html
<!DOCTYPE html>
<html>
<head>
<meta charset='utf-8' />
<title>U.S. Congressional Districts</title>
<script src='https://cdnjs.cloudflare.com/ajax/libs/mapbox-gl/2.1.1/mapbox-gl.js'></script>
<link href='https://cdnjs.cloudflare.com/ajax/libs/mapbox-gl/2.1.1/mapbox-gl.css' rel='stylesheet' />
<style>
body {
margin: 0;
padding: 0;
}
#map {
position: absolute;
top: 0;
bottom: 0;
width: 100%;
}
</style>
</head>
<body>
<div id='map'></div>
<script>
const getCenterFrom = mapBounds => [(mapBounds[0] + mapBounds[2]) / 2, (mapBounds[1] + mapBounds[3]) / 2]
const params = new URLSearchParams(location.search)
let state = 'IN'
if (params.has('state')) state = params.get('state')
mapboxgl.accessToken = 'pk.eyJ1Ijoid2lsbGNhcnRlciIsImEiOiJjamV4b2g3Z2ExOGF4MzFwN3R1dHJ3d2J4In0.Ti-hnuBH8W4bHn7k6GCpGw'
// get bounding box: http://bboxfinder.com
const mapBounds = [-130.429688, 23.563987, -63.105469, 52.268157]//Southwest corner, Northeast corner
const map = new mapboxgl.Map({
container: 'map',
style: `mapbox://styles/mapbox/bright-v9`,
center: getCenterFrom(mapBounds),
zoom: 3
})
map.on('load', () => {
map.addSource('districts', {
type: 'geojson',
data: `https://21u9zetks1.execute-api.us-east-1.amazonaws.com/dev/districtsForState/${state}`
})
map.addLayer({
id: 'districts-layer',
source: 'districts',
type: 'fill',
layout: {},
paint: {
'fill-color': '#f08',
'fill-opacity': 0.4
}
})
})
let zoomed = false
map.on('sourcedata', (e) => {
if (!zoomed && map.getSource('districts') && map.isSourceLoaded('districts')) {
const district = map.querySourceFeatures('districts').find(district => true)//find the first district for state
if(district) {
map.flyTo({
center: [district.geometry.coordinates[0][0][0], district.geometry.coordinates[0][0][1]],
zoom: 5.5,
essential: true
})//fly to the first coordinate in the first district polygon
zoomed = true
}
}
})
</script>
</body>
</html>
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