49 lines
1.4 KiB
JavaScript
49 lines
1.4 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 VectorLayer from '../src/ol/layer/Vector.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 {DEVICE_PIXEL_RATIO} from '../src/ol/has.js';
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import {Fill, Stroke, Style} from '../src/ol/style.js';
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import {fromLonLat} from '../src/ol/proj.js';
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// Gradient and pattern are in canvas pixel space, so we adjust for the
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// renderer's pixel ratio
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const pixelRatio = DEVICE_PIXEL_RATIO;
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// Generate a rainbow gradient
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const canvas = document.createElement('canvas');
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const context = canvas.getContext('2d');
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const gradient = context.createLinearGradient(0, 0, 1024 * pixelRatio, 0);
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gradient.addColorStop(0, 'red');
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gradient.addColorStop(1 / 6, 'orange');
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gradient.addColorStop(2 / 6, 'yellow');
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gradient.addColorStop(3 / 6, 'green');
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gradient.addColorStop(4 / 6, 'aqua');
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gradient.addColorStop(5 / 6, 'blue');
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gradient.addColorStop(1, 'purple');
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const vectorLayer = new VectorLayer({
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background: 'white',
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source: new VectorSource({
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url: 'data/kml/states.kml',
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format: new KML({extractStyles: false}),
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}),
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style: new Style({
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fill: new Fill({color: gradient}),
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stroke: new Stroke({
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color: '#333',
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width: 1,
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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: [vectorLayer],
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target: 'map',
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view: new View({
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center: fromLonLat([-100, 38.5]),
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zoom: 4,
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}),
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});
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