89 lines
2.3 KiB
JavaScript
89 lines
2.3 KiB
JavaScript
import Map from '../src/ol/Map.js';
|
|
import TileLayer from '../src/ol/layer/WebGLTile.js';
|
|
import View from '../src/ol/View.js';
|
|
import XYZ from '../src/ol/source/XYZ.js';
|
|
import {fromLonLat} from '../src/ol/proj.js';
|
|
|
|
const key = 'get_your_own_D6rA4zTHduk6KOKTXzGB';
|
|
const attributions =
|
|
'<a href="https://www.maptiler.com/copyright/" target="_blank">© MapTiler</a> ' +
|
|
'<a href="https://www.openstreetmap.org/copyright" target="_blank">© OpenStreetMap contributors</a>';
|
|
|
|
// band math operates on normalized values from 0-1
|
|
// so we scale by 255 to align with the elevation formula
|
|
// from https://cloud.maptiler.com/tiles/terrain-rgb/
|
|
const elevation = [
|
|
'+',
|
|
-10000,
|
|
[
|
|
'*',
|
|
0.1 * 255,
|
|
[
|
|
'+',
|
|
['*', 256 * 256, ['band', 1]],
|
|
['+', ['*', 256, ['band', 2]], ['band', 3]],
|
|
],
|
|
],
|
|
];
|
|
|
|
const layer = new TileLayer({
|
|
opacity: 0.6,
|
|
source: new XYZ({
|
|
url:
|
|
'https://api.maptiler.com/tiles/terrain-rgb/{z}/{x}/{y}.png?key=' + key,
|
|
tileSize: 512,
|
|
maxZoom: 12,
|
|
}),
|
|
style: {
|
|
variables: {
|
|
level: 0,
|
|
},
|
|
color: [
|
|
'case',
|
|
// use the `level` style variable to determine the color
|
|
['<=', elevation, ['var', 'level']],
|
|
[139, 212, 255, 1],
|
|
[139, 212, 255, 0],
|
|
],
|
|
},
|
|
});
|
|
|
|
const map = new Map({
|
|
target: 'map',
|
|
layers: [
|
|
new TileLayer({
|
|
source: new XYZ({
|
|
url: 'https://api.maptiler.com/maps/streets/{z}/{x}/{y}.png?key=' + key,
|
|
attributions: attributions,
|
|
tileSize: 512,
|
|
maxZoom: 22,
|
|
}),
|
|
}),
|
|
layer,
|
|
],
|
|
view: new View({
|
|
center: fromLonLat([-122.3267, 37.8377]),
|
|
zoom: 11,
|
|
}),
|
|
});
|
|
|
|
const control = document.getElementById('level');
|
|
const output = document.getElementById('output');
|
|
control.addEventListener('input', function () {
|
|
output.innerText = control.value;
|
|
layer.updateStyleVariables({level: parseFloat(control.value)});
|
|
});
|
|
output.innerText = control.value;
|
|
|
|
const locations = document.getElementsByClassName('location');
|
|
for (let i = 0, ii = locations.length; i < ii; ++i) {
|
|
locations[i].addEventListener('click', relocate);
|
|
}
|
|
|
|
function relocate(event) {
|
|
const data = event.target.dataset;
|
|
const view = map.getView();
|
|
view.setCenter(fromLonLat(data.center.split(',').map(Number)));
|
|
view.setZoom(Number(data.zoom));
|
|
}
|