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Merge pull request #133 from openlayers/f4g21
Version updates for the new English version
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,128 +1 @@ | ||
| import 'ol/ol.css'; | ||
| import Feature from 'ol/Feature'; | ||
| import Point from 'ol/geom/Point'; | ||
| import {Map, View} from 'ol'; | ||
| import {Stamen, Vector as VectorSource} from 'ol/source'; | ||
| import {Tile as TileLayer, WebGLPoints as WebGLPointsLayer} from 'ol/layer'; | ||
| import {fromLonLat} from 'ol/proj'; | ||
|
|
||
| const source = new VectorSource(); | ||
|
|
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| const client = new XMLHttpRequest(); | ||
| client.open('GET', './data/meteorites.csv'); | ||
| client.onload = function () { | ||
| const csv = client.responseText; | ||
| let curIndex; | ||
| let prevIndex = 0; | ||
| const features = []; | ||
|
|
||
| while ((curIndex = csv.indexOf('\n', prevIndex)) > 0) { | ||
| const line = csv.substr(prevIndex, curIndex - prevIndex).split(','); | ||
|
|
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| prevIndex = curIndex + 1; | ||
| if (prevIndex === 0) { | ||
| continue; // skip header | ||
| } | ||
|
|
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| const coords = fromLonLat([parseFloat(line[4]), parseFloat(line[3])]); | ||
|
|
||
| features.push( | ||
| new Feature({ | ||
| mass: parseFloat(line[1]) || 0, | ||
| year: parseInt(line[2]) || 0, | ||
| geometry: new Point(coords), | ||
| }) | ||
| ); | ||
| } | ||
| source.addFeatures(features); | ||
| }; | ||
| client.send(); | ||
|
|
||
| //! [years] | ||
| const minYear = 1850; | ||
| const maxYear = 2015; | ||
| const span = maxYear - minYear; | ||
| const rate = 10; // years per second | ||
|
|
||
| const start = Date.now(); | ||
|
|
||
| const styleVariables = { | ||
| currentYear: minYear, | ||
| }; | ||
| //! [years] | ||
|
|
||
| //! [expressions] | ||
| const period = 10; | ||
| const periodStart = ['-', ['var', 'currentYear'], period]; | ||
| const decay = [ | ||
| 'interpolate', | ||
| ['linear'], | ||
| ['get', 'year'], | ||
| periodStart, | ||
| 0, | ||
| ['var', 'currentYear'], | ||
| 1, | ||
| ]; | ||
| //! [expressions] | ||
|
|
||
| const meteorites = new WebGLPointsLayer({ | ||
| source: source, | ||
| style: { | ||
| //! [variables] | ||
| variables: styleVariables, | ||
| //! [variables] | ||
| //! [filter] | ||
| filter: ['between', ['get', 'year'], periodStart, ['var', 'currentYear']], | ||
| //! [filter] | ||
| symbol: { | ||
| symbolType: 'circle', | ||
| //! [size] | ||
| size: [ | ||
| '*', | ||
| decay, | ||
| ['+', ['*', ['clamp', ['*', ['get', 'mass'], 1 / 20000], 0, 1], 18], 8], | ||
| ], | ||
| //! [size] | ||
| color: 'rgb(255, 0, 0)', | ||
| //! [opacity] | ||
| opacity: ['*', 0.5, decay], | ||
| //! [opacity] | ||
| }, | ||
| }, | ||
| //! [hitdetection] | ||
| disableHitDetection: true, | ||
| //! [hitdetection] | ||
| }); | ||
|
|
||
| //! [declaration] | ||
| const map = new Map({ | ||
| //! [declaration] | ||
| target: 'map-container', | ||
| layers: [ | ||
| new TileLayer({ | ||
| source: new Stamen({ | ||
| layer: 'toner', | ||
| }), | ||
| }), | ||
| meteorites, | ||
| ], | ||
| view: new View({ | ||
| center: [0, 0], | ||
| zoom: 2, | ||
| }), | ||
| }); | ||
|
|
||
| //! [animate] | ||
| const yearElement = document.getElementById('year'); | ||
|
|
||
| function render() { | ||
| const elapsed = (rate * (Date.now() - start)) / 1000; | ||
| styleVariables.currentYear = Math.round(minYear + (elapsed % span)); | ||
| yearElement.innerText = styleVariables.currentYear; | ||
|
|
||
| map.render(); | ||
| requestAnimationFrame(render); | ||
| } | ||
|
|
||
| render(); | ||
| //! [animate] | ||
| alert('Hello Workshop'); |
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