It seems to be the more simple solution. Graphviz is already able to
generate an image map file from a dot file (cmap option in Graphviz). It
works well applied on graph displayed as an image.
It's also possible to add javascript event on map area to trigger on click
and other events to display menu or to catch "node to node" link creation.
But, I don't know if it is possible to make the same with canvas...
Have you an idea for the implementation of this feature ?
Thanks a lot (and sorry for my english)