78 lines
2.1 KiB
JavaScript
78 lines
2.1 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 {fromLonLat} from '../src/ol/proj.js';
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import {Raster as RasterSource, TileJSON} from '../src/ol/source.js';
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import XYZ from '../src/ol/source/XYZ.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 = -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] = 145;
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pixel[1] = 175;
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pixel[2] = 186;
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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 = 'pk.eyJ1IjoidHNjaGF1YiIsImEiOiJjaW5zYW5lNHkxMTNmdWttM3JyOHZtMmNtIn0.CDIBD8H-G2Gf-cPkIuWtRg';
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const elevation = new XYZ({
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url: 'https://api.mapbox.com/v4/mapbox.terrain-rgb/{z}/{x}/{y}.pngraw?access_token=' + key,
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crossOrigin: 'anonymous'
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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 TileJSON({
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url: 'https://api.tiles.mapbox.com/v4/mapbox.world-light.json?secure&access_token=' + key,
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crossOrigin: 'anonymous'
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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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control.addEventListener('input', function() {
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output.innerText = control.value;
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raster.changed();
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});
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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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