76 lines
1.8 KiB
JavaScript
76 lines
1.8 KiB
JavaScript
import Map from '../src/ol/Map.js';
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import OSM from '../src/ol/source/OSM.js';
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import TileLayer from '../src/ol/layer/Tile.js';
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import View from '../src/ol/View.js';
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// default zoom, center and rotation
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let zoom = 2;
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let center = [0, 0];
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let rotation = 0;
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if (window.location.hash !== '') {
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// try to restore center, zoom-level and rotation from the URL
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const hash = window.location.hash.replace('#map=', '');
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const parts = hash.split('/');
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if (parts.length === 4) {
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zoom = parseFloat(parts[0]);
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center = [parseFloat(parts[1]), parseFloat(parts[2])];
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rotation = parseFloat(parts[3]);
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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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new TileLayer({
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source: new OSM(),
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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: center,
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zoom: zoom,
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rotation: rotation,
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}),
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});
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let shouldUpdate = true;
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const view = map.getView();
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const updatePermalink = function () {
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if (!shouldUpdate) {
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// do not update the URL when the view was changed in the 'popstate' handler
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shouldUpdate = true;
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return;
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}
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const center = view.getCenter();
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const hash =
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'#map=' +
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view.getZoom().toFixed(2) +
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'/' +
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center[0].toFixed(2) +
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'/' +
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center[1].toFixed(2) +
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'/' +
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view.getRotation();
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const state = {
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zoom: view.getZoom(),
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center: view.getCenter(),
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rotation: view.getRotation(),
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};
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window.history.pushState(state, 'map', hash);
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};
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map.on('moveend', updatePermalink);
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// restore the view state when navigating through the history, see
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// https://developer.mozilla.org/en-US/docs/Web/API/WindowEventHandlers/onpopstate
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window.addEventListener('popstate', function (event) {
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if (event.state === null) {
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return;
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}
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map.getView().setCenter(event.state.center);
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map.getView().setZoom(event.state.zoom);
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map.getView().setRotation(event.state.rotation);
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shouldUpdate = false;
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});
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