120 lines
3.5 KiB
JavaScript
120 lines
3.5 KiB
JavaScript
const aufgabe1 = () => {
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const map = L.map('map').setView([53.0, 14.0], 4)
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map.addLayer(new L.tileLayer('https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', {
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attribution: 'Map data <a href="https://openstreetmap.org">OpenStreetMap</a> contributors',
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minZoom: 1,
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maxZoom: 18
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}))
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const levels = [0, 20, 50, 100, 200, 250, 300, 400]
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let geojson;
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const getColor = density => {
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switch (true) {
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case density > levels[7]:
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return '#800026'
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case density > levels[6]:
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return '#BD0026'
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case density > levels[5]:
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return '#E31A1C'
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case density > levels[4]:
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return '#FC4E2A'
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case density > levels[3]:
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return '#FD8D3C'
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case density > levels[2]:
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return '#FEB24C'
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case density > levels[1]:
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return '#FED976'
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case density > levels[0]:
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return '#FFEDA0'
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default:
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return '#ffdea1'
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}
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}
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// Add the legend to the map
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const legend = L.control({position: 'bottomright'})
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legend.onAdd = () => {
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const legend = L.DomUtil.create('div', 'info legend')
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const labels = []
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for (let i = 0; i < levels.length; i++) {
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labels.push(
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'<i style="background:' + getColor(levels[i] + 1) + '"></i> '
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+ levels[i] + (levels[i + 1] ? '–' + levels[i + 1] : '+')
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)
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}
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legend.innerHTML = labels.join('<br>')
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return legend
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}
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legend.addTo(map)
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// Control that shows state info on hover
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const info = L.control()
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info.onAdd = () => {
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info._div = L.DomUtil.create('div', 'info')
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info.update()
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return info._div
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}
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info.update = props => {
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info._div.innerHTML = '<h4>European Population Density</h4>'
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if (props) {
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let formattedDensity = new Intl.NumberFormat('de-DE').format(props.density)
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info._div.innerHTML += `<b>${props.name}</b><br>${formattedDensity} people/km<sup>2</sup>`
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} else {
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info._div.innerHTML += 'Hover over a country'
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}
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}
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info.addTo(map);
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// Hover over feature
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const onEachFeature = (feature, layer) => {
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layer.on({
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mouseover: event => {
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event.target.setStyle({
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weight: 5,
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color: '#666',
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dashArray: '',
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fillOpacity: 0.7
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})
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if (!L.Browser.ie && !L.Browser.opera && !L.Browser.edge) {
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event.target.bringToFront()
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}
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info.update(event.target.feature.properties)
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},
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mouseout: event => {
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geojson.resetStyle(event.target)
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info.update()
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},
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click: event => map.fitBounds(event.target.getBounds())
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})
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}
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// Default style for each feature
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const getStyle = feature => ({
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stroke: true,
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fill: true,
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fillColor: getColor(feature.properties.density),
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fillOpacity: 1,
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dashArray: '3',
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weight: 2,
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color: 'black'
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})
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// Load data in
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$.getJSON('europe.geo.json', data => {
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data.features.map(feature => feature.properties.density = feature.properties.pop_est / (turf.area(feature) / 1_000_000))
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geojson = L.geoJson(data, {style: getStyle, onEachFeature}).addTo(map)
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})
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}
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aufgabe1()
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