102 lines
2.6 KiB
JavaScript
102 lines
2.6 KiB
JavaScript
import KML from '../src/ol/format/KML.js';
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import Map from '../src/ol/Map.js';
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import Stamen from '../src/ol/source/Stamen.js';
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import VectorSource from '../src/ol/source/Vector.js';
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import View from '../src/ol/View.js';
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import {Fill, Stroke, Style} from '../src/ol/style.js';
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import {Tile as TileLayer, Vector as VectorLayer} from '../src/ol/layer.js';
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/*
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* Compute the style of the feature. Here we want the opacity of polygons to
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* be based on the offset from local noon. For example, a timezone where it is
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* currently noon would have an opacity of 0.75. And a timezone where it is
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* currently midnight would have an opacity of 0. This doesn't account for
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* daylight savings, so don't use it to plan your vacation.
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*/
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const styleFunction = function (feature) {
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let offset = 0;
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const name = feature.get('name'); // e.g. GMT -08:30
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const match = name.match(/([\-+]\d{2}):(\d{2})$/);
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if (match) {
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const hours = parseInt(match[1], 10);
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const minutes = parseInt(match[2], 10);
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offset = 60 * hours + minutes;
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}
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const date = new Date();
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const local = new Date(
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date.getTime() + (date.getTimezoneOffset() + offset) * 60000
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);
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// offset from local noon (in hours)
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let delta = Math.abs(12 - local.getHours() + local.getMinutes() / 60);
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if (delta > 12) {
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delta = 24 - delta;
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}
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const opacity = 0.75 * (1 - delta / 12);
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return new Style({
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fill: new Fill({
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color: [0xff, 0xff, 0x33, opacity],
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}),
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stroke: new Stroke({
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color: '#ffffff',
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}),
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});
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};
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const vector = new VectorLayer({
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source: new VectorSource({
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url: 'data/kml/timezones.kml',
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format: new KML({
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extractStyles: false,
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}),
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}),
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style: styleFunction,
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});
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const raster = new TileLayer({
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source: new Stamen({
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layer: 'toner',
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}),
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});
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const map = new Map({
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layers: [raster, vector],
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target: 'map',
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view: new View({
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center: [0, 0],
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zoom: 2,
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}),
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});
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const info = $('#info');
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info.tooltip({
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animation: false,
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trigger: 'manual',
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});
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const displayFeatureInfo = function (pixel) {
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info.css({
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left: pixel[0] + 'px',
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top: pixel[1] - 15 + 'px',
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});
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const feature = map.forEachFeatureAtPixel(pixel, function (feature) {
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return feature;
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});
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if (feature) {
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info.attr('data-original-title', feature.get('name')).tooltip('show');
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} else {
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info.tooltip('hide');
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}
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};
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map.on('pointermove', function (evt) {
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if (evt.dragging) {
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info.tooltip('hide');
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return;
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}
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displayFeatureInfo(map.getEventPixel(evt.originalEvent));
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});
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map.on('click', function (evt) {
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displayFeatureInfo(evt.pixel);
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});
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