Am 19.09.2016 um 20:50 schrieb David Kastrup:
> Urs Liska <> writes:
> [...]
> You are working with slopes here.  Don't.  They don't support vertical
> lines.

Yes, that's what I realized ...

> Please take a look at the recently added functions
>    ly:length ly:angle ly:directed
> They will usually make it easy to do the operations you want.  In
> particular ly:directed can also use a vector as a direction without ever
> calculating its angle.

Thanks! From looking at the docs it seems they'll do exactly what I want
(and had partially implemented in Scheme). Can't wait to return to my
LilyPond computer :-)

Urs Liska

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