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 {MultiPoint, Point} from '../src/ol/geom.js';
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import TileLayer from '../src/ol/layer/Tile.js';
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import OSM from '../src/ol/source/OSM.js';
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import CircleStyle from '../src/ol/style/Circle.js';
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import Fill from '../src/ol/style/Fill.js';
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import Stroke from '../src/ol/style/Stroke.js';
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import Style from '../src/ol/style/Style.js';
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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: [0, 0],
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zoom: 2
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})
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});
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const imageStyle = new Style({
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image: new CircleStyle({
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radius: 5,
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snapToPixel: false,
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fill: new Fill({color: 'yellow'}),
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stroke: new Stroke({color: 'red', width: 1})
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})
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});
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const headInnerImageStyle = new Style({
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image: new CircleStyle({
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radius: 2,
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snapToPixel: false,
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fill: new Fill({color: 'blue'})
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})
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});
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const headOuterImageStyle = new Style({
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image: new CircleStyle({
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radius: 5,
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snapToPixel: false,
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fill: new Fill({color: 'black'})
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})
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});
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const n = 200;
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const omegaTheta = 30000; // Rotation period in ms
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const R = 7e6;
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const r = 2e6;
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const p = 2e6;
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map.on('postcompose', function(event) {
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const vectorContext = event.vectorContext;
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const frameState = event.frameState;
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const theta = 2 * Math.PI * frameState.time / omegaTheta;
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const coordinates = [];
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let i;
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for (i = 0; i < n; ++i) {
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const t = theta + 2 * Math.PI * i / n;
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const x = (R + r) * Math.cos(t) + p * Math.cos((R + r) * t / r);
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const y = (R + r) * Math.sin(t) + p * Math.sin((R + r) * t / r);
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coordinates.push([x, y]);
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}
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vectorContext.setStyle(imageStyle);
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vectorContext.drawGeometry(new MultiPoint(coordinates));
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const headPoint = new Point(coordinates[coordinates.length - 1]);
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vectorContext.setStyle(headOuterImageStyle);
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vectorContext.drawGeometry(headPoint);
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vectorContext.setStyle(headInnerImageStyle);
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vectorContext.drawGeometry(headPoint);
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map.render();
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});
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map.render();
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