111 lines
2.9 KiB
JavaScript
111 lines
2.9 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 TileLayer from '../src/ol/layer/Tile.js';
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import XYZ from '../src/ol/source/XYZ.js';
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const key = 'get_your_own_D6rA4zTHduk6KOKTXzGB';
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const attributions = '<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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const disabledLayer = new TileLayer({
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// specify className so forEachLayerAtPixel can distinguish layers
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className: 'ol-layer-dem',
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source: new XYZ({
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attributions: attributions,
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url: 'https://api.maptiler.com/tiles/terrain-rgb/{z}/{x}/{y}.png?key=' + key,
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maxZoom: 10,
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crossOrigin: '',
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imageSmoothing: false
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})
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});
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const imagery = new TileLayer({
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className: 'ol-layer-imagery',
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source: new XYZ({
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attributions: attributions,
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url: 'https://api.maptiler.com/tiles/satellite/{z}/{x}/{y}.jpg?key=' + key,
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maxZoom: 20,
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crossOrigin: ''
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})
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});
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const enabledLayer = new TileLayer({
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source: new XYZ({
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attributions: attributions,
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url: 'https://api.maptiler.com/tiles/terrain-rgb/{z}/{x}/{y}.png?key=' + key,
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maxZoom: 10,
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crossOrigin: ''
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})
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});
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imagery.on('prerender', function(evt) {
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// use opaque background to conceal DEM while fully opaque imagery renders
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if (imagery.getOpacity() === 1) {
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evt.context.fillStyle = 'white';
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evt.context.fillRect(0, 0, evt.context.canvas.width, evt.context.canvas.height);
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}
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});
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const control = document.getElementById('opacity');
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const output = document.getElementById('output');
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control.addEventListener('input', function() {
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output.innerText = control.value;
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imagery.setOpacity(control.value / 100);
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});
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output.innerText = control.value;
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imagery.setOpacity(control.value / 100);
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const view = new View({
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center: [6.893, 45.8295],
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zoom: 16,
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projection: 'EPSG:4326'
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});
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const map1 = new Map({
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target: 'map1',
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layers: [disabledLayer, imagery],
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view: view
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});
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const map2 = new Map({
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target: 'map2',
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layers: [enabledLayer],
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view: view
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});
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const info1 = document.getElementById('info1');
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const info2 = document.getElementById('info2');
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const showElevations = function(evt) {
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if (evt.dragging) {
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return;
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}
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map1.forEachLayerAtPixel(
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evt.pixel,
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function(layer, pixel) {
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const height = -10000 + (pixel[0] * 256 * 256 + pixel[1] * 256 + pixel[2]) * 0.1;
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info1.innerText = height.toFixed(1);
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},
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{
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layerFilter: function(layer) {
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return layer === disabledLayer;
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}
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}
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);
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map2.forEachLayerAtPixel(
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evt.pixel,
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function(layer, pixel) {
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const height = -10000 + (pixel[0] * 256 * 256 + pixel[1] * 256 + pixel[2]) * 0.1;
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info2.innerText = height.toFixed(1);
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},
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{
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layerFilter: function(layer) {
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return layer === enabledLayer;
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}
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}
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);
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};
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map1.on('pointermove', showElevations);
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map2.on('pointermove', showElevations);
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