61 lines
1.7 KiB
JavaScript
61 lines
1.7 KiB
JavaScript
import Map from '../src/ol/Map.js';
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import OSM from '../src/ol/source/OSM.js';
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import TileLayer from '../src/ol/layer/WebGLTile.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 {getRenderPixel} from '../src/ol/render.js';
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const osm = new TileLayer({
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source: new OSM({wrapX: true}),
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});
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const key = 'get_your_own_D6rA4zTHduk6KOKTXzGB';
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const imagery = new TileLayer({
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source: new XYZ({
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url: 'https://api.maptiler.com/tiles/satellite/{z}/{x}/{y}.jpg?key=' + key,
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attributions:
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'<a href="https://www.maptiler.com/copyright/" target="_blank">© MapTiler</a> ' +
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'<a href="https://www.openstreetmap.org/copyright" target="_blank">© OpenStreetMap contributors</a>',
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maxZoom: 20,
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}),
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});
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const map = new Map({
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layers: [osm, imagery],
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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 swipe = document.getElementById('swipe');
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imagery.on('prerender', function (event) {
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const gl = event.context;
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gl.enable(gl.SCISSOR_TEST);
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const mapSize = map.getSize(); // [width, height] in CSS pixels
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// get render coordinates and dimensions given CSS coordinates
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const bottomLeft = getRenderPixel(event, [0, mapSize[1]]);
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const topRight = getRenderPixel(event, [mapSize[0], 0]);
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const width = Math.round((topRight[0] - bottomLeft[0]) * (swipe.value / 100));
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const height = topRight[1] - bottomLeft[1];
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gl.scissor(bottomLeft[0], bottomLeft[1], width, height);
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});
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imagery.on('postrender', function (event) {
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const gl = event.context;
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gl.disable(gl.SCISSOR_TEST);
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});
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const listener = function () {
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map.render();
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};
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swipe.addEventListener('input', listener);
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swipe.addEventListener('change', listener);
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