79c8afdba8
To have the same path (starting with `ol/`, without `.js`) as in the documentation. The support was added in the webpack config in #8928
97 lines
2.2 KiB
JavaScript
97 lines
2.2 KiB
JavaScript
import Map from 'ol/Map';
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import View from 'ol/View';
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import KML from 'ol/format/KML';
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import {Tile as TileLayer, Vector as VectorLayer} from 'ol/layer';
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import Stamen from 'ol/source/Stamen';
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import VectorSource from 'ol/source/Vector';
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import {Circle as CircleStyle, Fill, Stroke, Style} from 'ol/style';
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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 = $('#info');
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info.tooltip({
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animation: false,
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trigger: 'manual'
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});
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const displayFeatureInfo = function(pixel) {
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info.css({
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left: pixel[0] + 'px',
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top: (pixel[1] - 15) + 'px'
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});
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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.tooltip('hide')
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.attr('data-original-title', feature.get('name'))
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.tooltip('fixTitle')
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.tooltip('show');
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} else {
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info.tooltip('hide');
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}
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};
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map.on('pointermove', function(evt) {
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if (evt.dragging) {
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info.tooltip('hide');
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return;
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}
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displayFeatureInfo(map.getEventPixel(evt.originalEvent));
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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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