106 lines
2.5 KiB
JavaScript
106 lines
2.5 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 {Circle as CircleStyle, Fill, Stroke, Style} from '../src/ol/style.js';
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import {Tile as TileLayer, Vector as VectorLayer} from '../src/ol/layer.js';
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const styleCache = {};
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const styleFunction = 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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const radius = 5 + 20 * (magnitude - 5);
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let style = styleCache[radius];
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if (!style) {
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style = new Style({
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image: new CircleStyle({
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radius: radius,
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fill: new Fill({
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color: 'rgba(255, 153, 0, 0.4)',
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}),
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stroke: new Stroke({
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color: 'rgba(255, 204, 0, 0.2)',
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width: 1,
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}),
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}),
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});
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styleCache[radius] = style;
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}
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return style;
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};
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const vector = new VectorLayer({
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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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style: styleFunction,
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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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const map = 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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const info = document.getElementById('info');
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info.style.pointerEvents = 'none';
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const tooltip = new bootstrap.Tooltip(info, {
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animation: false,
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customClass: 'pe-none',
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offset: [0, 5],
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title: '-',
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trigger: 'manual',
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});
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let currentFeature;
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const displayFeatureInfo = function (pixel) {
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const feature = map.forEachFeatureAtPixel(pixel, function (feature) {
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return feature;
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});
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if (feature) {
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info.style.left = pixel[0] + 'px';
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info.style.top = pixel[1] + 'px';
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if (feature !== currentFeature) {
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tooltip.setContent({'.tooltip-inner': feature.get('name')});
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}
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if (currentFeature) {
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tooltip.update();
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} else {
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tooltip.show();
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}
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} else {
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tooltip.hide();
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}
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currentFeature = feature;
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};
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map.on('pointermove', function (evt) {
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if (evt.dragging) {
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tooltip.hide();
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currentFeature = undefined;
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return;
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}
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const pixel = map.getEventPixel(evt.originalEvent);
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displayFeatureInfo(pixel);
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});
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map.on('click', function (evt) {
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displayFeatureInfo(evt.pixel);
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});
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