reverse the direction of arrows in xdot.py graphs without modifying the dot input

[lkartik]

Hi,
I am trying to reverse the arrows in th edges of my graph. Say I have directed graph a-> b, b->c in graphviz dot format. But, I want the xdot.py to draw the graphs(with arrow head and tail reversed,) as b->a and c->b. Perhaps, it should be possible by modifying the vector graphics drawing functions(LINE_CAP_BUTT/LINE_JOIN_MITER). I was trying to modify the cairo functions(cr.*) in many classes by exchanging the x and y , src and dst. But, could not get it done It would be really helpful for me if anyone could point me the function/show how to do it. Any help would be much appreciated.

[jrfonseca]

What you're trying to do is beyond the xdot.py's scope of being a viewer.

Furthermore, I don't think it's technically possible. xdot output doesn't express things in terms of "arrow heads", but rather polygons.

In short, if you want to revert the output, pre-process the dot graph input, not the xdot output or xdot.py itself.