1. let's call the direction 'gdir'
gdir = new GDirections(map, document.getElementById("directions"));
2. obtain the shortest route: var route = gdir.getRoute(0);
3. obtain the number of steps on the route:var stepn=route.getNumSteps();
4. define your object:var polyline = gdir.getPolyline();
5. find the first point on the route:splitvx=polyline.getVertex(0);
6. make a loop through all the steps:for (i=0;i<stepn;i++){}
7. get the coordinates of the first point on the route:
var start=route.getStartGeocode();
8. get the total number of point on the route:var numPolylineVertices = polyline.getVertexCount();
9. make a loop to extract all the coordinates on the route:for (n=0;n<numPolylineVertices;n++){
vertexCoord=polyline.getVertex(n);
var arr = new Array();
arr[n]=vertexCoord;}
10. perform a loop against your list of coordinates to get the distances.
Some notes:
Obviously this technique is good on short distances, after that the user's browser will crash.
The code should be placed in it's suitable place, but a sample you can find here.
