85 lines
2.3 KiB
JavaScript
85 lines
2.3 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 Feature from '../../../src/ol/Feature.js';
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import Polygon from '../../../src/ol/geom/Polygon.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 Style from '../../../src/ol/style/Style.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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// create 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, 30, 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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// create pattern
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canvas.width = 11;
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canvas.height = 11;
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context.fillStyle = 'rgba(102, 0, 102, 0.5)';
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context.beginPath();
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context.arc(5, 5, 4, 0, 2 * Math.PI);
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context.fill();
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context.fillStyle = 'rgb(55, 0, 170)';
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context.beginPath();
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context.arc(5, 5, 2, 0, 2 * Math.PI);
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context.fill();
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const pattern = context.createPattern(canvas, 'repeat');
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const vectorSource = new VectorSource();
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let feature;
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// rectangle with 1 hole
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feature = new Feature({
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geometry: new Polygon([
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[[-22.5, -5], [-22.5, 35], [37.5, 35], [37.5, -5], [-22.5, -5]],
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[[-2.5, 7], [17.5, 7], [17.5, 23], [-2.5, 23], [-2.5, 7]]
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])
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});
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feature.setStyle(new Style({
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fill: new Fill({color: pattern}),
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stroke: new Stroke({color: gradient, width: 3})
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}));
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vectorSource.addFeature(feature);
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// rectangle with 2 holes
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feature = new Feature({
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geometry: new Polygon([
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[[-37.5, -32.5], [-37.5, 17.5], [32.5, 17.5], [32.5, -32.5], [-37.5, -32.5]],
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[[-33.5, -28.5], [-21.5, -28.5], [-21.5, -16.5], [-33.5, -16.5], [-33.5, -28.5]],
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[[12.5, -28.5], [26.5, -28.5], [26.5, -16.5], [12.5, -16.5], [12.5, -28.5]]
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])
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});
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feature.setStyle(new Style({
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fill: new Fill({color: gradient}),
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stroke: new Stroke({color: pattern, width: 5})
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}));
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vectorSource.addFeature(feature);
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new Map({
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pixelRatio: 1,
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layers: [
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new VectorLayer({
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source: vectorSource
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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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resolution: 1
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})
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});
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render();
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