editor of polyline for edge

[dener16350]

Dear Graphstream creators,
First thanks for your library :-)
I'm engineer in a french public research team which works for simulation of water drinking network.
I'm trying to use it to create a network editor (for water supply), for nodes it's OK.
But pipes follow the street and if we want a representation with openstreetmap for background for example, we need polyline as path for edges.
I use shape:polyline in css to draw my network, and it's fine.
But I need also to create or modify the path of one edge.
First if I move beginning or ending node of the edge, what is the solution to redraw the polyline for connected links ? (mouse dragged)
And second how modify GS to modify by mouse dragged edgepoints and inject the result in the graph model ?

Best regards
Denis