[Therion] color centerlines by map?

[Stacho Mudrak]

This is exactly the problem: currently therion is not able to handle
attributes individually for shots. But this item is already in the
TODO list, I will try to implement is ASAP.

Regards, S.

On Sun, Apr 13, 2008 at 9:05 PM, Jonathan Prouty <dormat at gmail.com> wrote:
> I've made some progress in my attempt at having splay legs be colored
>  differently from regular survey legs, but I'm afraid I've hit a wall.
>
>  I've added "-attr splay on" to all surveys that consist of nothing but
>  splay legs. This makes it necessary that I record splay legs and
>  regular legs in different surveys within therion. This is a bit of a
>  pain, but it will work for now.
>
>  In order to take advantage of the "splay" custom attribute, I've also
>  redefined the metapost macro responsible for drawing centerlines:
>
>       def l_survey_cave(expr p) =
>         pickup PenD;
>         if known ATTR_splay:
>           draw p withcolor green;
>         else:
>           draw p withcolor red;
>         fi;
>       enddef;
>
>  The macro works as it should. If a survey has the "splay" custom
>  attribute (value doesn't matter), the survey will be colored green.
>  Unfortunately, ALL survey lines are colored green, not just the ones
>  with the "splay" attribute.
>
>  I think this is because internally, therion combines all surveys into
>  a single object to draw them. Therefore, if any survey has the "splay"
>  attribute, "if known ATTR_splay:" will return true for the entire
>  thing. If this is the case, is there any way to limit the scope of the
>  "splay" custom attribute?
>
>  I think using this splay attribute is a nasty hack, considering
>  therion already maintains meta data that determines whether a given
>  survey leg is a splay shot or not. Is there a way to check what flags
>  a station/leg has set from within metapost? Something similar to the
>  following:
>
>       def l_survey_cave(expr p) =
>         pickup PenD;
>         if splay_flag_set:
>           draw p withcolor green;
>         else:
>           draw p withcolor red;
>         fi;
>       enddef;
>
>  --
>  -Jonny ^v^
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