Re: color expansion at runtime

["Wolfgang Schuster" <schuster.wolfgang@googlemail.com>]

2007/12/15, Peter Rolf <indiego@gmx.net>:
> Wolfgang Schuster schrieb:
> > 2007/12/14, Peter Rolf <indiego@gmx.net>:
> >> Hi,
> >>
> >> I desperately need runtime defined colors (state dependent) for my
> >> macros. The macros are used with different graphic styles, which is the
> >> reason why I want to avoid any style dependent part inside them.
> >>
> >> To give you an example. I need something like this
> >>
> >> \color[{\StateDependentColor[stateA=green,stateC=blue,whatever=yellow,...]}]
> >>
> >> If flag 'stateA' is true at runtime, then color 'green' is used (and so
> >> on; order is significant).
> >>
> >> I have written such a macro, but sadly it crashes when used inside
> >> \color or \definecolor. Tried to debug it, but this is my first
> >> experience with the trace commands (probably not the best example to
> >> start with). Sigh, still so much to learn.. :)
> >>
> >> Any hints are welcome.
> >>
> >> Regards, Peter
> >
> > Hi Peter,
> >
> > can you try this (untested),
>
> Hi Wolfgang,
>
> your idea works pretty good (I haven't thought about \ifcase 'til now).
> Still the problem is, that
>
> - currentstate must be set somehow
> - the colors and the number of used states vary from macro to macro
>
> So I have to define individual variants of \statecolor (with non fixed
> state=number pairs), or add an entry for every single state (currently
> 9). The later method is too ugly (imagine the case that you only need
> states 0 and 8) and will be hard to maintain if new states arise.

It is hard to give a better solution because I don't what do you want to achive
and how your interface should look to change the states and colors ...

> I end up with 60 macros and that is what I want to avoid. Anyhow thanks
> for your help.
> I will try to trace my color macro while listening the right music for
> such problems (Yo La Tengo - I am not afraid of you and will beat your
> ass). Hopefully it works. ;)
>
> Greetings, Peter

I wish you good luck to find a better solution, I'm myself a little
busy till monday
and can't help you for the moment and I run into a few other ConTeXt problems
(and bugs, mkii and mkiv) the last two days and wasted to many time with them.

Wolfgang
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