84 lines
2.0 KiB
JavaScript
84 lines
2.0 KiB
JavaScript
import Map from '../src/ol/Map.js';
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import View from '../src/ol/View.js';
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import MVT from '../src/ol/format/MVT.js';
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import VectorTileLayer from '../src/ol/layer/VectorTile.js';
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import VectorTileSource from '../src/ol/source/VectorTile.js';
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import Style from '../src/ol/style/Style.js';
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import Fill from '../src/ol/style/Fill.js';
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import Stroke from '../src/ol/style/Stroke.js';
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// lookup for selection objects
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let selection = {};
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// feature property to act as identifier
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const idProp = 'iso_a3';
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const vtLayer = new VectorTileLayer({
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declutter: true,
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source: new VectorTileSource({
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format: new MVT(),
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url: 'https://ahocevar.com/geoserver/gwc/service/tms/1.0.0/' +
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'ne:ne_10m_admin_0_countries@EPSG%3A900913@pbf/{z}/{x}/{-y}.pbf'
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}),
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style: function(feature) {
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// normal style
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let style = new Style({
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stroke: new Stroke({
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color: 'gray',
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width: 1
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}),
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fill: new Fill({
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color: 'rgba(20,20,20,0.9)'
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})
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});
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if (selection[feature.get(idProp)]) {
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// selection style
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style = new Style({
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stroke: new Stroke({
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color: 'rgba(200,20,20,0.8)',
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width: 2
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}),
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fill: new Fill({
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color: 'rgba(200,20,20,0.2)'
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})
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});
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}
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return style;
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}
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});
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const map = new Map({
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layers: [
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vtLayer
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],
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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 selectElement = document.getElementById('type');
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map.on('click', updateSelection);
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function updateSelection(event) {
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const features = map.getFeaturesAtPixel(event.pixel);
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if (!features) {
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selection = {};
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// force redraw of layer style
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vtLayer.setStyle(vtLayer.getStyleFunction());
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return;
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}
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const feature = features[0];
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const fid = feature.get(idProp);
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if (selectElement.value === 'singleselect') {
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selection = {};
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}
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// add selected feature to lookup
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selection[fid] = feature;
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// force redraw of layer style
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vtLayer.setStyle(vtLayer.getStyleFunction());
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}
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