cb6995d71a
* Replace Math.log2 with ol/math.log2 * TypedArray.from() browser compatibility fallback * listen for input and change events for range
93 lines
2.4 KiB
JavaScript
93 lines
2.4 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 {Image as ImageLayer, Tile as TileLayer} from '../src/ol/layer.js';
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import {Raster as RasterSource, XYZ} from '../src/ol/source.js';
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import {fromLonLat} from '../src/ol/proj.js';
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function flood(pixels, data) {
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const pixel = pixels[0];
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if (pixel[3]) {
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const height =
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-10000 + (pixel[0] * 256 * 256 + pixel[1] * 256 + pixel[2]) * 0.1;
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if (height <= data.level) {
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pixel[0] = 134;
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pixel[1] = 203;
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pixel[2] = 249;
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pixel[3] = 255;
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} else {
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pixel[3] = 0;
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}
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}
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return pixel;
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}
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const key = 'get_your_own_D6rA4zTHduk6KOKTXzGB';
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const 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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const elevation = new TileLayer({
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source: new XYZ({
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url:
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'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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elevation.on('prerender', function (evt) {
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evt.context.imageSmoothingEnabled = false;
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evt.context.msImageSmoothingEnabled = false;
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});
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const raster = new RasterSource({
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sources: [elevation],
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operation: flood,
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});
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const map = new Map({
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target: 'map',
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layers: [
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new TileLayer({
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source: new XYZ({
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attributions: attributions,
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url: 'https://api.maptiler.com/maps/streets/{z}/{x}/{y}.png?key=' + key,
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tileSize: 512,
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}),
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}),
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new ImageLayer({
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opacity: 0.6,
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source: raster,
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}),
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],
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view: new View({
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center: fromLonLat([-122.3267, 37.8377]),
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zoom: 11,
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}),
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});
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const control = document.getElementById('level');
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const output = document.getElementById('output');
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const listener = function () {
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output.innerText = control.value;
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raster.changed();
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};
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control.addEventListener('input', listener);
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control.addEventListener('change', listener);
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output.innerText = control.value;
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raster.on('beforeoperations', function (event) {
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event.data.level = control.value;
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});
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const locations = document.getElementsByClassName('location');
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for (let i = 0, ii = locations.length; i < ii; ++i) {
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locations[i].addEventListener('click', relocate);
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}
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function relocate(event) {
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const data = event.target.dataset;
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const view = map.getView();
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view.setCenter(fromLonLat(data.center.split(',').map(Number)));
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view.setZoom(Number(data.zoom));
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}
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