Google Maps v3 - limit viewable area and zoom level

SO-3818016

HTML

<script src="http://maps.google.com/maps/api/js?sensor=false"></script>
<div id="map" style="width: 400px; height: 300px;"></div>

JavaScript

// This is the minimum zoom level that we'll allow
 var minZoomLevel = 14;

 var map = new google.maps.Map(document.getElementById('map'), {
     zoom: minZoomLevel,
     center: new google.maps.LatLng(53.2170249, 6.5656727),
     mapTypeId: google.maps.MapTypeId.ROADMAP
 });

var marker = new google.maps.Marker({
    position: {lat: 53.218573, lng: 6.567293},
    map: map,
    title: '???'
});

 // Bounds for Groningen
 var strictBounds = new google.maps.LatLngBounds(
 new google.maps.LatLng(53.2124505, 6.5558022), //Southwest
 new google.maps.LatLng(53.2212904, 6.5760153)); //Northeast

 // Listen for the dragend event
 google.maps.event.addListener(map, 'bounds_changed', function () {
     if (strictBounds.contains(map.getCenter())) return;

     // We're out of bounds - Move the map back within the bounds

     var c = map.getCenter(),
         x = c.lng(),
         y = c.lat(),
         maxX = strictBounds.getNorthEast().lng(),
         maxY = strictBounds.getNorthEast().lat(),
         minX = strictBounds.getSouthWest().lng(),
         minY = strictBounds.getSouthWest().lat();

     if (x < minX) x = minX;
     if (x > maxX) x = maxX;
     if (y < minY) y = minY;
     if (y > maxY) y = maxY;

     map.setCenter(new google.maps.LatLng(y, x));
 });

 // Limit the zoom level
 google.maps.event.addListener(map, 'zoom_changed', function () {
     if (map.getZoom() < minZoomLevel) map.setZoom(minZoomLevel);
 });