Full coordinates across streets with google maps

If you go here: http://econym.org.uk/gmap/snap.htm there are some examples of the kind of stuff I'm trying to do. I want the user to enter a route on a google maps widget, and then have the map drawl the route along roads. Then the user click on a "submit" button, and their rout开发者_JAVA技巧e is sent back to the server where it will be stored in a database.

Instead of sending back just the red vertices, I want to send back all the information that makes up the purple lines. Is this possible?

Purple lines are polylines which are stored as an array under DOM.You can send their information into your server.

In this page,there is a javascript event triggers after you clicked on map as follows:

var firstpoint = true;
var gmarkers = [];
var gpolys = [];
var dist = 0;

GEvent.addListener(dirn,"load", function() {
    // snap to last vertex in the polyline
    var n = dirn.getPolyline().getVertexCount();
    var p=dirn.getPolyline().getVertex(n-1);
    var marker=new GMarker(p);
    map.addOverlay(marker);
    // store the details
    gmarkers.push(marker);
    if (!firstpoint) {
      map.addOverlay(dirn.getPolyline());
      gpolys.push(dirn.getPolyline());
      dist += dirn.getPolyline().Distance();
      document.getElementById("distance").innerHTML="Path length: "+(dist/1000).toFixed(2)+" km. "+(dist/1609.344).toFixed(2)+" miles.";
    }
    firstpoint = false;
  });

These lines of code say that,after you clicked on map,the point you clicked snapped to nearest road,then if you add a second point to another point,a blue route appears as between all those polylines.

As I said previously,those polylines are stored in gpolys array.Also know that all vertices or GMarkers are also stored in gmarkers array.