[NTG-context] Drawing oriented paths in MetaFun

Does MetaFun provide some macro to draw oriented paths? I would like it to basically add a small arrow *in the middle* of the path? Such a macro draworiented somepath somespecs ; would have to act like drawarrow firsthalf(somepath) somespecs ; draw secondhalf(somepath) somespecs ; Is it available already, or should I roll my own? -- Giuseppe "Oblomov" Bilotta