57 lines
1.4 KiB
JavaScript
57 lines
1.4 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 TileLayer from '../src/ol/layer/Tile.js';
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import OSM from '../src/ol/source/OSM.js';
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import VectorLayer from '../src/ol/layer/Vector.js';
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import VectorSource from '../src/ol/source/Vector.js';
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import Draw from '../src/ol/interaction/Draw.js';
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import smooth from 'chaikin-smooth';
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function makeSmooth(path, numIterations) {
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numIterations = Math.min(Math.max(numIterations, 1), 10);
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while (numIterations > 0) {
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path = smooth(path);
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numIterations--;
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}
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return path;
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}
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const vectorSource = new VectorSource({});
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const map = new Map({
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layers: [
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new TileLayer({
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source: new OSM(),
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opacity: 0.5
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}),
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new VectorLayer({
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source: vectorSource
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})
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],
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target: 'map',
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view: new View({
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center: [1078373.5950, 6871994.5910],
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zoom: 5
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})
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});
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const shallSmoothen = document.getElementById('shall-smoothen');
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const numIterations = document.getElementById('iterations');
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const draw = new Draw({
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source: vectorSource,
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type: 'LineString'
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});
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map.addInteraction(draw);
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draw.on('drawend', function(event) {
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if (!shallSmoothen.checked) {
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return;
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}
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const feat = event.feature;
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const geometry = feat.getGeometry();
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const coords = geometry.getCoordinates();
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const smoothened = makeSmooth(coords, parseInt(numIterations.value, 10) || 5);
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geometry.setCoordinates(smoothened);
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});
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