title: polyline snap to road using google maps api v3
body: <p>In google maps api v2 it was easy, </p>
  
  <pre><code>var map = new GMap2(document.getElementById("map"));
      map.setCenter(new GLatLng(53.7877, -2.9832),13)
  //    map.addControl(new GLargeMapControl());
  //    map.addControl(new GMapTypeControl());
      var dirn = new GDirections();
  
  //      var firstpoint = true;
      var gmarkers = [];
      var gpolys = [];
      var dist = 0;
  
  // == When the user clicks on a the map, get directiobns from that point to itself ==
  
  gmarkers.push(new google.maps.LatLng(53.7877, -2.9832));
  gmarkers.push(new google.maps.LatLng(53.9007, -2.9832));
  gmarkers.push(new GLatLng(53.600, -2.700));
  
  
  
  for (var i = 0; i &lt; gmarkers.length-1; i++) {
      console.log(gmarkers[i]);
                  dirn.loadFromWaypoints([gmarkers[i].toUrlValue(6),gmarkers[i+1].toUrlValue(6)],{getPolyline:true});
  
  }
  
  
  // == when the load event completes, plot the point on the street ==
      GEvent.addListener(dirn,"load", function() {
  // snap to last vertex in the polyline
          var n = dirn.getPolyline().getVertexCount();
              map.addOverlay(dirn.getPolyline());
              gpolys.push(dirn.getPolyline());
              dist += dirn.getPolyline().getDistance();
              document.getElementById("distance").innerHTML="Path length: "+(dist/1000).toFixed(2)+" km. "+(dist/1609.344).toFixed(2)+" miles.";
             });
      GEvent.addListener(dirn,"error", function() {
          GLog.write("Failed: "+dirn.getStatus().code);
      });
  console.log(dirn);
  </code></pre>
  
  <p>In google api V3 this way simple doesnt work. There is something like directions service but I dont have any idea how I can draw polyline through my points and polyline will be snaped to road.</p>