On 04.02.2016 12:26, Joseph Redfern wrote:

I'm trying to make the output of my graph-tool drawings a little more pretty. At the moment, if I have two thick edges that intersect at an angle other than 0°, there is some uglyness at the corners; see: http://i.imgur.com/CuEDoth.png and http://i.imgur.com/r54Mp9E.png.

It may be worth mentioning that I'm manually setting vertex positions (by specifying `pos` in my graph_draw call).

I've mentioned this on the #cairo IRC channel, and they suggest it may be because graph-tool is considering each edge as a seperate line, rather than being part of a larger path - could you confirm that this is the case? It was also suggested that I changing the line caps (presumably to have rounded ends) would solve it - does the API exposed by graph-tool allow this? In cairo, it would be a call to set_line_cap().

graph-tool was not really designed to make this sort of drawing. Making the edges being part of a larger path would require a major redesign. Although it would be possible to implement line caps easily, it would not entirely solve your problem. I think the most straightforward thing for you to consider is to actually draw the nodes with circle shapes of the appropriate size, with the same color as the edges. This should remove a large portion of the raggedness... Best, Tiago -- Tiago de Paula Peixoto <tiago@skewed.de>