H Mounir,
I have recently done something similar and managed to do part
of what you require, I can take an origin and destination and calculate a
route between them and return a feature (representing the route) based on
the Path object returned. I have a blog where I save useful stuff that I
otherwise might forget. Here is the link
(http://usefulpracticalgeoblog.blogspot.com/search?updated-min=2011-01-01T00:00:00-08:00&updated-max=2012-01-01T00:00:00-08:00&max-results=1).
The code is heavily commented to help you hopefully understand what is going
on and can be downloaded, along with example shapefiles, from my GooglePages
website
The code does the following :-
- finds closest graph node to coordinate tuples representing destination and
origin
- calculates route
- generates a feature with a geometry representing the route, a cost
representing the distance and also an objectID
- feeds all the routes (if multiple there are destinations) into a
featurecollection that can then be drawn
As for your coloring, I suggest you take the featurecollection returned and
apply a style to it that is different from your road network and then draw
it on top. That is how I have tackled that problem anyway :-)
I hope it helps you.
Kind Regards,
Paul
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This paper provides an overview of data connectivity, details
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