Image overlay for GoogleMaps with Opacity Control

A simple library which adds easy support for Overlay to Google Maps API. It also adds a simple Opacity Control for use with Google Maps, which allows you to change the opacity of your tile overlay and simple geolocation control.

The easiest way to prepare map for Google Maps overlay is to use MapTiler Desktop.

Read more

Usage in page

 <!DOCTYPE html>
          <title>Campus Map</title>
          <meta charset="utf-8"/>
          <meta name="viewport" content="initial-scale=1.0, user-scalable=no"/>
          <script src=""></script>
          <script src=""></script>

            function init() {
              var opts = {
                streetViewControl: false,
                tilt: 0,
                center: new google.maps.LatLng(0, 0),
                zoom: 3

              var map = new google.maps.Map(document.getElementById('map'), opts);
              var mapBounds = new google.maps.LatLngBounds(
                      new google.maps.LatLng(31.433639, -100.470039),
                      new google.maps.LatLng(31.444161, -100.448983));
              var mapMinZoom = 12;
              var mapMaxZoom = 18;
              var overlay = new klokantech.MapTilerMapType(map, function (x, y, z) {
                return "{z}/{x}/{y}.png".replace('{z}', z).replace('{x}', x).replace('{y}', y);
                      mapBounds, mapMinZoom, mapMaxZoom);

              var opacitycontrol = new klokantech.OpacityControl(map, overlay);

              var geoloccontrol = new klokantech.GeolocationControl(map, mapMaxZoom);

            html, body, #map { width:100%; height:100%; margin:0; padding:0; }
        <body onload="init()">
          <div id="map"></div>



klokantech.MapTilerMapType(map, tileurl, opt_bounds, opt_minZoom, opt_maxZoom, opt_dontAdd)

  • map {google.maps.Map} Map object.
  • tileurl {function} function(number, number, number) Function which returns url to tile.
  • opt_bounds {google.maps.LatLngBounds} Overlay bounds.
  • opt_minZoom {number} Minimal zoom of layer.
  • opt_maxZoom {number} Maximal zoom of layer.
  • opt_dontAdd {boolean} Layer should be created but not added to the map.
  • getTile(tileCoord, zoom, ownerDocument)
  • setOpacity(value) Sets opacity to value <0,1>

klokantech.OpacityControl(map, layer, opacity)

  • map {google.maps.Map} Map object.
  • layer {Object} Layer for opacity change.
  • opacity {number} Default opacity of layer.
  • setOpacity(value) Sets opacity to value <0,1>

klokantech.GeolocationControl(map, opt_maxZoom, opt_controlPosition);

  • map {google.maps.Map} Map object.
  • opt_zoom {number} Zoom to use when first position is obtained.
  • opt_controlPosition {google.maps.ControlPosition=}
  • Découvrez MapTiler en français!


    Přečtěte si více v češtině

    Více na

    Leer más en español


    Meer in het Nederlands

    Ga naar

    日本語で詳細をみる へ

    Weitere Informationen finden Sie


    ديزملا فشتكإ ىلإ لقتنا

    Explore MapTiler in Switzerland