Pinch Zoom

This example uses OpenLayers v4.0.1. The latest is v.

#### Pinch Zoom

Restrict pinch zooming to integer zoom levels.

By default, the `ol.interaction.PinchZoom` can leave the map at fractional zoom levels. If instead you want to constrain pinch zooming to integer zoom levels, set `constrainResolution: true` when constructing the interaction.

Related API documentation:

- ol.Map
,
- ol.View
,
- ol.interaction
,
- ol.interaction.PinchZoom
,
- ol.layer.Tile
,
- ol.source.OSM

Copy Edit
Pinch Zoom Restrict pinch zooming to integer zoom levels. var map = new ol.Map({ interactions: ol.interaction.defaults({pinchZoom: false}).extend([ new ol.interaction.PinchZoom({ constrainResolution: true // force zooming to a integer zoom }) ]), layers: [ new ol.layer.Tile({ source: new ol.source.OSM() }) ], target: 'map', view: new ol.View({ center: [0, 0], zoom: 2 }) }); <div id="map" class="map"></div>

    <!DOCTYPE html>
    <html>
      <head>
        <title>Pinch Zoom</title>
        <link rel="stylesheet" href="https://openlayers.org/en/v4.0.1/css/ol.css" type="text/css">
        <!-- The line below is only needed for old environments like Internet Explorer and Android 4.x -->
        <script src="https://cdn.polyfill.io/v2/polyfill.min.js?features=requestAnimationFrame,Element.prototype.classList,URL"></script>
        <script src="https://openlayers.org/en/v4.0.1/build/ol.js"></script>
      </head>
      <body>
        <div id="map" class="map"></div>
        <script>
          var map = new ol.Map({
            interactions: ol.interaction.defaults({pinchZoom: false}).extend([
              new ol.interaction.PinchZoom({
                constrainResolution: true // force zooming to a integer zoom
              })
            ]),
            layers: [
              new ol.layer.Tile({
                source: new ol.source.OSM()
              })
            ],
            target: 'map',
            view: new ol.View({
              center: [0, 0],
              zoom: 2
            })
          });
        </script>
      </body>
    </html>