[NTG-context] framed parameter

[Hans Hagen]

Hans van der Meer wrote:
> On Jun 30, 2006, at 19:05, Hans Hagen wrote:
>
>   
>> Hans van der Meer wrote:
>>     
>>> Just curious, because the last of the three examples solves the  
>>> problem.
>>>
>>> Why is it that this is allowed in the parameter list of \framed:
>>>
>>> \framed[frame=on,\iftrue width=3cm\fi]{abc}
>>>       
>> i would not use that kind of tricks, since it's pure luck if it works
>>     
>>> But this gives an error:
>>> \framed[frame=on,\iftrue background=color,backgroundcolor=green\fi] 
>>> {abc}
>>>       
>> because a , is seen and it separates the if from the fi
>>     
>>> ! Incomplete \if; all text was ignored after line 42.
>>> <inserted text>
>>> � � � � � � � � \fi
>>> <*> test.tex
>>> � � � � � �� emergencyend
>>> ?
>>>
>>> Allthough�this works and solves the problem I had:
>>> \framed[frame=on,background=\iftrue color\else
>>> none\fi,backgroundcolor=green]{abc}
>>>
>>> Is this somewhat inconsistent behaviour intrinsic to some  
>>> parameters?�
>>> I thought all parameters are picked up by a macro and then stashed  
>>> away.
>>>       
>> indeed
>>
>> btw background=none will trigger an overlay called 'none', when  
>> defined
>>
>> why do you need such tricks?
>>
>>     
>
> I want to switch runtime between colors. The switching occurs inside  
> the execution of a \halign template.
>   
then just redefine the color

\definecolor[colorone][r=1]
\definecolor[colortwo][g=1]

\definecolor[mycolor][colorone]

....

\definecolor[mycolor][colortwo] 

or, when you want to switch many colors, use color palets and switch palets 

Hans 


 

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