81 lines
2.0 KiB
JavaScript
81 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 {defaults as defaultControls} from '../src/ol/control.js';
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import TileLayer from '../src/ol/layer/Tile.js';
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import _ol_source_OSM_ from '../src/ol/source/OSM.js';
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// default zoom, center and rotation
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var zoom = 2;
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var center = [0, 0];
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var 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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var hash = window.location.hash.replace('#map=', '');
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var parts = hash.split('/');
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if (parts.length === 4) {
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zoom = parseInt(parts[0], 10);
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center = [
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parseFloat(parts[1]),
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parseFloat(parts[2])
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];
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rotation = parseFloat(parts[3]);
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}
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}
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var map = new Map({
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layers: [
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new TileLayer({
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source: new _ol_source_OSM_()
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})
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],
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controls: defaultControls({
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attributionOptions: {
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collapsible: false
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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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var shouldUpdate = true;
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var view = map.getView();
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var 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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var center = view.getCenter();
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var hash = '#map=' +
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view.getZoom() + '/' +
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Math.round(center[0] * 100) / 100 + '/' +
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Math.round(center[1] * 100) / 100 + '/' +
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view.getRotation();
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var 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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