Reverse direction of control in sequence diagram possible?

[cheahTJ]

With regards to this diagram, can I check if it can be drawn as such as the conventional and typical diagrams we always saw is the passing of control from the left to right, but in this case is right to left, from bar to foo. So is this possible?

[damithc]

@cheahTJ The direction can be left or right, provided they are horizontal and not angled up/down.

But yes, normally we start the interaction from a top left position, although it is not a rule.

[cheahTJ]

Got it thank you prof!