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index.js
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index.js
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import fetch from 'isomorphic-fetch'
import mapbox from 'mapbox-gl'
import turfExtent from 'turf-extent'
import './style.css'
const DBL_QUOTE = '"'
const COMMA = ','
const root = document.getElementById('root')
root.innerHTML = `
<div id="map"></div>
<div id="menu">
<select id="systems-select">
<option value="none">Select a system</option>
</select>
<div id="system-info"></div>
</div>
`
// run!
let Systems = window.Systems = {}
run()
mapbox.accessToken = process.env.MAPBOX_ACCESS_TOKEN
const map = new mapbox.Map({
container: 'map',
style: process.env.MAPBOX_MAP_STYLE,
zoom: 14
})
const systemInfo = document.getElementById('system-info')
const systemsSelect = document.getElementById('systems-select')
systemsSelect.onchange = function (event) {
console.log(event)
const id = event.target.value
if (id !== 'none') selectSystem(id)
}
function selectSystem (id) {
const System = Systems[id]
systemInfo.innerHTML = `
<p><strong><a href='${System.url}'>${System.name}</a></strong></p>
<small>${System.location}, ${System.country}</small>
`
if (System.geojson) {
map.fitBounds(turfExtent(System.geojson))
} else {
updateStations(System)
}
}
async function run () {
try {
await getSystems()
} catch (e) {
console.error(e.stack)
}
Object.keys(Systems).forEach((id) => {
const System = Systems[id]
const option = document.createElement('option')
option.value = id
option.appendChild(document.createTextNode(`${System.location} - ${System.name}`))
systemsSelect.appendChild(option)
})
}
function getSystems () {
return fetch('/gbfs/systems.csv')
.then((res) => res.text())
.then((csv) => {
csv
.split('\n')
.slice(1, -1)
.map((row) => {
const quotes = row.split(DBL_QUOTE)
// FYI: breaks on non-double-quoted location
// return [...quotes[0].slice(0, -1).split(','), quotes[1], ...quotes[2].slice(1).split(',')]
if (quotes.length === 3) {
// handle the case with double-quoted location:
const first = quotes[0].split(COMMA)
const last = quotes[2].split(COMMA)
return [
first[0],
first[1], // ignore last comma in first chunk
quotes[1], // use middle chunk from quotes split
last[1], // ignore first comma in last chunk
last[2],
last[3]
]
} else {
// standard un-quoted location
return row.split(COMMA)
}
})
.forEach((row) => {
Systems[row[3]] = {
country: row[0],
name: row[1],
location: row[2],
id: row[3],
url: row[4],
gbfs: row[5]
}
})
})
.catch((e) => {
throw e
})
}
function updateStations (System, infoUrl) {
return fetch(`/gbfs/${System.id}/station_information.json`)
.then((res) => res.json())
.then((gbfs) => {
System.geojson = gbfs2geojson(gbfs)
map.addSource(System.id, {
cluster: true,
clusterRadius: 25,
data: System.geojson,
type: 'geojson'
})
map.addLayer({
id: System.id,
layout: {
'icon-image': 'marker-15'
},
source: System.id,
type: 'symbol'
})
const clusterLayers = [
[150, '#f28cb1'],
[20, '#f1f075'],
[0, '#51bbd6']
]
clusterLayers.forEach((layer, i) => {
map.addLayer({
id: `${System.id}-cluster-${i}`,
type: 'circle',
source: System.id,
paint: {
'circle-color': layer[1],
'circle-radius': 18,
'circle-opacity': 0.5
},
filter: i === 0
? ['>=', 'point_count', layer[0]]
: ['all',
['>=', 'point_count', layer[0]],
['<', 'point_count', clusterLayers[i - 1][0]]]
})
})
map.addLayer({
id: `${System.id}-cluster-count`,
type: 'symbol',
source: System.id,
layout: {
'text-field': '{point_count}',
'text-font': [
'DIN Offc Pro Medium',
'Arial Unicode MS Bold'
],
'text-size': 12
}
})
map.fitBounds(turfExtent(System.geojson))
})
.catch((e) => {
throw e
})
}
function gbfs2geojson (station_information) {
return {
type: 'FeatureCollection',
features: station_information.data.stations.map(function (station) {
return {
type: 'Feature',
properties: station,
geometry: {
type: 'Point',
coordinates: [
station.lon,
station.lat
]
}
}
})
}
}