Demonstrates how the view's minimum zoom level can be changed.
The minZoom
option for a view limits how far out you can zoom. This property can be updated by calling view.setMinZoom(newMinZoom)
. In this example, the minimum zoom level is set so that you only see one world at a time. Resize your browser window to change the threshold.
import 'ol/ol.css';
import Map from 'ol/Map';
import OSM from 'ol/source/OSM';
import TileLayer from 'ol/layer/Tile';
import View from 'ol/View';
var viewport = document.getElementById('map');
function getMinZoom() {
var width = viewport.clientWidth;
return Math.ceil(Math.LOG2E * Math.log(width / 256));
}
var initialZoom = getMinZoom();
var view = new View({
center: [0, 0],
minZoom: initialZoom,
zoom: initialZoom,
});
var map = new Map({
layers: [
new TileLayer({
source: new OSM(),
}) ],
target: 'map',
view: view,
});
window.addEventListener('resize', function () {
var minZoom = getMinZoom();
if (minZoom !== view.getMinZoom()) {
view.setMinZoom(minZoom);
}
});
<!DOCTYPE html>
<html lang="en">
<head>
<title>View Min-Zoom</title>
<!-- Pointer events polyfill for old browsers, see https://caniuse.com/#feat=pointer -->
<script src="https://unpkg.com/elm-pep"></script>
<style>
.map {
width: 100%;
height:400px;
}
</style>
</head>
<body>
<div id="map" class="map"></div>
<script src="main.js"></script>
</body>
</html>
{
"name": "min-zoom",
"dependencies": {
"ol": "6.4.3"
},
"devDependencies": {
"parcel": "1.11.0"
},
"scripts": {
"start": "parcel index.html",
"build": "parcel build --experimental-scope-hoisting --public-url . index.html"
}
}