52 lines
1.4 KiB
JavaScript
52 lines
1.4 KiB
JavaScript
import KML from '../src/ol/format/KML.js';
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import Map from '../src/ol/Map.js';
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import Stamen from '../src/ol/source/Stamen.js';
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import VectorSource from '../src/ol/source/Vector.js';
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import View from '../src/ol/View.js';
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import {Heatmap as HeatmapLayer, Tile as TileLayer} from '../src/ol/layer.js';
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const blur = document.getElementById('blur');
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const radius = document.getElementById('radius');
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const vector = new HeatmapLayer({
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source: new VectorSource({
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url: 'data/kml/2012_Earthquakes_Mag5.kml',
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format: new KML({
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extractStyles: false,
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}),
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}),
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blur: parseInt(blur.value, 10),
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radius: parseInt(radius.value, 10),
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weight: function (feature) {
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// 2012_Earthquakes_Mag5.kml stores the magnitude of each earthquake in a
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// standards-violating <magnitude> tag in each Placemark. We extract it from
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// the Placemark's name instead.
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const name = feature.get('name');
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const magnitude = parseFloat(name.substr(2));
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return magnitude - 5;
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},
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});
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const raster = new TileLayer({
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source: new Stamen({
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layer: 'toner',
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}),
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});
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new Map({
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layers: [raster, vector],
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target: 'map',
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view: new View({
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center: [0, 0],
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zoom: 2,
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}),
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});
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blur.addEventListener('input', function () {
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vector.setBlur(parseInt(blur.value, 10));
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});
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radius.addEventListener('input', function () {
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vector.setRadius(parseInt(radius.value, 10));
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});
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