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