Re: color expansion at runtime

[Peter Rolf <indiego@gmx.net>]

Thomas A. Schmitz schrieb:
> On Dec 14, 2007, at 5:57 PM, Peter Rolf wrote:
> 
>> 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.
> 
> I'm not quite sure I understand what you're trying to do, so this is a  
> shot in the dark: instead of low-level trickery, you could use ConTeXt  
> modes:
>
> \startmode[A]
> \definecolor [mycolor] [g=1]
> \stopmode
> 
> \startmode[B]
> \definecolor [mycolor] [r=1]
> \stopmode
> 
> You can then set \enablemode[A] in your file or pass the mode on the  
> commandline: texexec --mode=A
>
Thanks Thomas for your help.

I can do this without low-level trickery, but this would mean one or two
(fore|backgroundcolor) additional macro(s) per building block (>20) for
every graphic style (currently 2; more to come). This makes about 60
stupid little macros..... nope.
I think that in some special cases I must do this anyway (where the
color is choosen from a combination of states), but most times a general
macro will do.

I will try to get it run this weekend (have to learn TeX debugging
first). But I wouldn't be surprised if this is the easier part of the
problem. We will see :)


Greetings, Peter

> HTH
> 
> Thomas
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