​

var map;

function createPoly() {

​

    wkt_str = "LINESTRING(-98.78 39.63,2.98 27.52)";

    var wkt = new Wkt.Wkt();

    try {

        wkt.read(wkt_str);

    } catch (e) {

        if (e.name === 'WKTError') {

            alert('Wicket could not understand the WKT string you entered.');

            return;

        }

    }

​

    var poly = wkt.toObject(map.defaults); // Make an object

    poly.setMap(map); // Add it to the map

    var bounds = new google.maps.LatLngBounds();

    poly.getPath().forEach(function(element,index){bounds.extend(element);});

    map.fitBounds(bounds);

   $('#result').append('Google length:' + google.maps.geometry.spherical.computeLength(poly.getPath().getArray()));

  $('#result').append('<br>Custom length:' + poly.Distance());

}

​

function initialize() {

    var mapOptions = {

        zoom: 13,

        center: new google.maps.LatLng(41.730723, -84.815529),

        mapTypeId: google.maps.MapTypeId.TERRAIN,

        defaults: {

            icon: 'red_dot.png',

            shadow: 'dot_shadow.png',

            //editable: true,

            strokeColor: '#990000',

            fillColor: '#EEFFCC',

            fillOpacity: 0.6

        }

    };

​

    map = new google.maps.Map(document.getElementById('map-canvas'),  mapOptions);

    createPoly();

}

​

google.maps.Polyline.prototype.Distance = function() {

   var dist = 0;

   for (var i=1; i < this.getPath().getLength(); i++) {

      dist += this.getPath().getAt(i).distanceFrom(this.getPath().getAt(i-1));

   }

   return dist;

};

​

google.maps.LatLng.prototype.distanceFrom = function(newLatLng) {

    var R = 6378137 ; // meters

    var lat1 = this.lat();

    var lon1 = this.lng();

    var lat2 = newLatLng.lat();

    var lon2 = newLatLng.lng();

    var dLat = (lat2-lat1) * Math.PI / 180.0;

    var dLon = (lon2-lon1) * Math.PI / 180.0;

    var a = Math.sin(dLat/2) * Math.sin(dLat/2.0) +

      Math.cos(lat1 * Math.PI / 180.0 ) * Math.cos(lat2 * Math.PI / 180.0 ) *

      Math.sin(dLon/2.0) * Math.sin(dLon/2.0);

    var c = 2.0 * Math.atan2(Math.sqrt(a), Math.sqrt(1.0-a));

    var d = R * c;

    return d;

};

​

google.maps.event.addDomListener(window, 'load', initialize);