76 lines
1.9 KiB
JavaScript
76 lines
1.9 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 {getCenter} from '../src/ol/extent.js';
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import TileLayer from '../src/ol/layer/Tile.js';
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import {transformExtent} from '../src/ol/proj.js';
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import Stamen from '../src/ol/source/Stamen.js';
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import TileWMS from '../src/ol/source/TileWMS.js';
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function threeHoursAgo() {
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return new Date(Math.round(Date.now() / 3600000) * 3600000 - 3600000 * 3);
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}
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const extent = transformExtent([-126, 24, -66, 50], 'EPSG:4326', 'EPSG:3857');
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let startDate = threeHoursAgo();
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const frameRate = 0.5; // frames per second
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let animationId = null;
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const layers = [
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new TileLayer({
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source: new Stamen({
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layer: 'terrain'
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})
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}),
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new TileLayer({
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extent: extent,
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source: new TileWMS({
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attributions: ['Iowa State University'],
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url: 'https://mesonet.agron.iastate.edu/cgi-bin/wms/nexrad/n0r-t.cgi',
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params: {'LAYERS': 'nexrad-n0r-wmst'}
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})
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})
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];
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const map = new Map({
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layers: layers,
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target: 'map',
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view: new View({
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center: getCenter(extent),
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zoom: 4
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})
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});
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function updateInfo() {
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const el = document.getElementById('info');
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el.innerHTML = startDate.toISOString();
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}
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function setTime() {
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startDate.setMinutes(startDate.getMinutes() + 15);
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if (startDate > Date.now()) {
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startDate = threeHoursAgo();
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}
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layers[1].getSource().updateParams({'TIME': startDate.toISOString()});
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updateInfo();
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}
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setTime();
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const stop = function() {
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if (animationId !== null) {
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window.clearInterval(animationId);
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animationId = null;
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}
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};
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const play = function() {
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stop();
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animationId = window.setInterval(setTime, 1000 / frameRate);
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};
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const startButton = document.getElementById('play');
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startButton.addEventListener('click', play, false);
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const stopButton = document.getElementById('pause');
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stopButton.addEventListener('click', stop, false);
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updateInfo();
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