Is it possible to use PlantUML to make the arrows on a sequence diagram sloped? I would like to be able to illustrate the passage of time. Also, I sometimes need to send two requests from an actor in parallel, and find that it's visually clearer if that is shown by arrows with the same start and different slopes.
Here's an example of what I'm looking for (from http://www.mcternan.me.uk/mscgen/)
thanks!
