html5/location.html at master · JustinMcConnell/html5 · GitHub

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<!doctype html>
<html>
<head>
  <title>Find Me</title>
  <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0">
  <meta http-equiv="Content-type" content="text/html;charset=UTF-8">
  <meta name="author" content="Justin McConnell">
  <meta name="url" content="https://github.com/JustinMcConnell">

  <style>
  html,
  body {
    margin: 0;
    padding: 0;
    height: 100%;
  }
  body {
    font-family: sans-serif;
  }
  #map {
    width: 100%;
    height: 100%;
  }
  #output {
    display: none;
    position: absolute;
    top: 0;
    left: 100px;
    background-color: rgba(0, 0, 0, 0.5);
    color: #fff;
    padding: 10px;
    line-height: 1.5;
    z-index: 1000;
  }
  </style>
</head>

<body>

  <div id="output"></div>
  <div id="map"></div>

  <script type="text/javascript" src="https://maps.googleapis.com/maps/api/js?libraries=geometry&sensor=true"></script>

  <script>
  // Animated Marker Movement. Robert Gerlach 2012-2013 https://github.com/combatwombat/marker-animate
  // MIT license
 (function(){var e=function(e,t){defaultOptions={duration:1e3,easing:"linear",complete:null};t=t||{};for(key in defaultOptions){t[key]=t[key]||defaultOptions[key]}var n;if(typeof this.getPosition==="function"){n="getPosition"}else if(typeof this.getCenter==="function"){n="getCenter"}var r;if(typeof this.setPosition==="function"){r="setPosition"}else if(typeof this.getCenter==="function"){r="setCenter"}if(t.easing!="linear"){if(typeof jQuery=="undefined"||!jQuery.easing[t.easing]){throw'"'+t.easing+"\" easing function doesn't exist. Include jQuery and/or the jQuery easing plugin and use the right function name.";return}}window.requestAnimationFrame=window.requestAnimationFrame||window.mozRequestAnimationFrame||window.webkitRequestAnimationFrame||window.msRequestAnimationFrame;window.cancelAnimationFrame=window.cancelAnimationFrame||window.mozCancelAnimationFrame;this.AT_startPosition_lat=this[n]().lat();this.AT_startPosition_lng=this[n]().lng();var i=e.lat();var s=e.lng();if(Math.abs(s-this.AT_startPosition_lng)>180){if(s>this.AT_startPosition_lng){s-=360}else{s+=360}}var o=function(n,u){var a=(new Date).getTime()-u;var f=a/t.duration;var l=f;if(t.easing!=="linear"){l=jQuery.easing[t.easing](f,a,0,1,t.duration)}if(f<1){var c=new google.maps.LatLng(n.AT_startPosition_lat+(i-n.AT_startPosition_lat)*l,n.AT_startPosition_lng+(s-n.AT_startPosition_lng)*l);n[r](c);if(window.requestAnimationFrame){n.AT_animationHandler=window.requestAnimationFrame(function(){o(n,u)})}else{n.AT_animationHandler=setTimeout(function(){o(n,u)},17)}}else{n[r](e);if(typeof t.complete==="function"){t.complete()}}};if(window.cancelAnimationFrame){window.cancelAnimationFrame(this.AT_animationHandler)}else{clearTimeout(this.AT_animationHandler)}o(this,(new Date).getTime())};google.maps.Marker.prototype.animateTo=e;google.maps.Circle.prototype.animateTo=e})()
  </script>

  <script>

  (function() {
        // google map
    var map,

        // last position
        lat_lng,

        // marker on last position
        marker,

        // reverse geocode the postion with this
        geocoder,

        // accuracy of position in meters
        accuracy,

        // display the reverse geocoded address here
        info_window,

        // draw a circle around the position where the radius is the accuracy of the position
        circle,

        // write debug output here
        output = document.querySelector("#output");

    /*
     * GPS sent a position update, do something on the map.
     */
    function position_update(position) {
      // map is not loaded
      if (!map) {
        return;
      }

      accuracy = position.coords.accuracy;
      lat_lng = new google.maps.LatLng(position.coords.latitude,
                                       position.coords.longitude);

      // update existing overlays
      if (marker) {
        marker.animateTo(lat_lng);
        circle.animateTo(lat_lng);

      // first time around, add overlays
      } else {
        marker = new google.maps.Marker({
          position: lat_lng,
          title: "You are here!",
          icon: {
            url: "location_position.png",
            size: new google.maps.Size(22, 22),
            origin: new google.maps.Point(0, 0),
            anchor: new google.maps.Point(11, 11)
          },
          map: map
        });

        info_window = new google.maps.InfoWindow({
          content: "You are here!"
        });

        geocoder.geocode({"latLng": lat_lng}, function(results, status) {
          if (status == google.maps.GeocoderStatus.OK && results[0]) {
            info_window.setContent("You are here:<br>" +
                                   results[0].formatted_address + "<br>" +
                                   "Accurate to within " + accuracy + " meters.");
            info_window.open(map, marker);
          }
        });

        circle = new google.maps.Circle({
          strokeColor: "#99C2E8",
          strokeOpacity: 1.0,
          strokeWeight: 2,
          fillColor: "#aaaacc",
          fillOpacity: 0.3,
          center: lat_lng,
          radius: accuracy,
          map: map
        });

        map.panTo(lat_lng);
        map.zoomTo(accuracy);
      }

      output.innerHTML += new Date() + " " +
                          position.coords.latitude.toFixed(2) + "x" +
                          position.coords.longitude.toFixed(2) + ", " +
                          accuracy + " m<br>";
    }

    function position_error(error) {
      output.innerHTML += "Error: " + error.message + " (" + error.code + ")<br>";
    }

    function load_map() {
      var mapOptions = {
        center: new google.maps.LatLng(37.77056, -122.42694),
        zoom: 12,
        mapTypeId: google.maps.MapTypeId.ROADMAP
      };
      map = new google.maps.Map(document.getElementById("map"), mapOptions);
      geocoder = new google.maps.Geocoder();
    }

    /*
     * Zoom the map step by step until it reaches about a certain size in meters.
     * zoomTo will stop when the map's width or height, which ever is smaller, reaches the given size.
     * Leave a little room to spare around the given size, this is the buffer.
     * Each zoom should only start after the previous zoom finishes animating.
     */
    google.maps.Map.prototype.zoomTo = function(meters, buffer) {
      // stop zooming when the map has reached meters * buffer
      buffer = buffer || 8;

      // max zoom level for the current map type (road, hybride, satellite)
      var maxZoom = map.mapTypes[map.getMapTypeId()].maxZoom;

      var zoom = function zoom() {
        var size = map.getSizeInMeters();
        var smaller_dimension = size.width < size.height ? "width" : "height";

        if (size[smaller_dimension] > (meters * buffer) && map.getZoom() < maxZoom) {
          map.setZoom(map.getZoom() + 1);
        } else {
          google.maps.event.removeListener(listener_handle);
        }
      };

      // zoom further when the previous zoom finishes
      var listener_handle = google.maps.event.addListener(map, "idle", zoom);

      zoom();
    };

    /*
     * Get the width and height of the map.  Google measures this in meters.
     */
    google.maps.Map.prototype.getSizeInMeters = function() {
      var bounds = this.getBounds();
      var northEast = bounds.getNorthEast();
      var southWest = bounds.getSouthWest();
      var northWest = new google.maps.LatLng(northEast.lat(), southWest.lng());
      var width = google.maps.geometry.spherical.computeDistanceBetween(northWest, northEast);
      var height = google.maps.geometry.spherical.computeDistanceBetween(northWest, southWest);
      return {"width": width, "height": height};
    };

    window.addEventListener("load", load_map);
    if (typeof window.navigator.geolocation == "object") {
      window.navigator.geolocation.watchPosition(position_update, position_error, {enableHighAccuracy: true});
    } else {
      output.innerHTML = "Your device does not support geolocaiton.<br>If it did, you would see your location marked on the map.";
      output.style.display = "block";
    }

  }());
  </script>

</body>
</html>