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Parse rodCreatePath-type subpath lists (or any list like (?width 5 ?layer "M1"))

patschouly

I'm creating my own rodCreatePath which includes snap-to-grid for diagonal segments. I've built the basic path functions, but I'm currently stuck at how to parse the lists for offsetsubpath, enclpath and subrects.


CreatePath(pts width @key (subpaths list()))
    foreach(subpath subpaths
        CreateSinglePath(CalculateOffsetPath(pts getElem(subpath ?sep)) getElem(subpath ?width))
    )
)

The question is: How can I implement getElem(). That is, how can I get the individual arguments from a list like (?width 5 ?layer "M1")

Kind regards,

Patrick

  • Andrew Beckett

    Hi Patrick,

    How about this? It's quite simple and elegant:

    ; if this was written in SKILL++ (ils) mode, pass the environment
; symeval(element theEnvironment())
procedure(getElem(subpath element)
    destructuringBind((@key layer width sep justification beginOffset 
            endOffset choppable prop enclosure) subpath
        symeval(element)
    )
)

    The use model would be slightly different - you'd use getElem(subpath 'width) (which would look less confusing because normally you don't have keyword arguments without a value). I made the getElem have the superset of enclosure and offset subpath arguments from rodCreatePath, but of course  you can tweak that to suit your needs.

    Andrew.

  • patschouly
    in reply to Andrew Beckett

    Awesome, that is indeed simple and elegent. Thanks for you help!

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