62 lines
1.4 KiB
JavaScript
62 lines
1.4 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 XYZ from '../../../src/ol/source/XYZ.js';
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import TileLayer from '../../../src/ol/layer/Tile.js';
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import MultiPolygon from '../../../src/ol/geom/MultiPolygon.js';
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import Style from '../../../src/ol/style/Style.js';
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import Stroke from '../../../src/ol/style/Stroke.js';
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import {getVectorContext} from '../../../src/ol/render.js';
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const source = new XYZ({
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url: '/data/tiles/osm/{z}/{x}/{y}.png',
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transition: 0
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});
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const layer = new TileLayer({
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source: source
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});
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const geometry = new MultiPolygon([
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[[[-80, -40], [-40, 0], [-80, 40], [-120, 0], [-80, -40]]],
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[[[80, -40], [120, 0], [80, 40], [40, 0], [80, -40]]]
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]).transform('EPSG:4326', 'EPSG:3857');
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const style = new Style({
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stroke: new Stroke({
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width: 2,
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color: 'blue'
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})
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});
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layer.on('prerender', function(event) {
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const context = event.context;
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context.save();
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const vectorContext = getVectorContext(event);
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vectorContext.setStyle(style);
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vectorContext.drawGeometry(geometry);
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context.clip();
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});
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layer.on('postrender', function(event) {
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const context = event.context;
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context.restore();
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const vectorContext = getVectorContext(event);
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vectorContext.setStyle(style);
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vectorContext.drawGeometry(geometry);
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});
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new Map({
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pixelRatio: 1,
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target: 'map',
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layers: [layer],
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view: new View({
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center: [0, 0],
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zoom: 0
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})
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});
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render();
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