[NTG-context] Problem with a defined colour in MetaFun
Keith McKay
mckaymeister at gmail.com
Fri Apr 29 15:19:28 CEST 2022
Hi Wolfgang,
Thank you for your reply. I did as you suggested but it still never
worked. However it did make me delve further into the Metafun,
LuaMetaFun and the Colouring ConTeXt manuals where I found examples of
the *resolvedcolor* helper which I used as follows:
definecolor [name = "myColor", r = uniformdeviate(1), g =
uniformdeviate(1), b = uniformdeviate(1)];
for loop..
fill unitsquare xscaled 5cm yscaled .5cm shifted (7cm,i*cm)
withcolor(r[resolvedcolor("myColor"), white]);
endfor;
I also found the *namedcolor* helper and I could use it as follows:
fill unitsquare xscaled 5cm yscaled .5cm shifted (1cm,(2*i)*cm)
withcolor namedcolor("myColor2") ;
However, for some reason it did not work in:
fill unitsquare xscaled 5cm yscaled .5cm shifted (7cm,i*cm)
withcolor(r[namedcolor("myColor"), white]);
//
Thanks again for your suggestion//
Best Wishes
Keith//
On 28/04/2022 16:04, Wolfgang Schuster wrote:
> Keith McKay via ntg-context schrieb am 28.04.2022 um 12:05:
>>
>> Hi,
>>
>> In the MWE below I define an rgb colour, myColor1, using random
>> numbers for the r, g and b components. I then use it to fill a
>> unitsquare the size of the page, which works as expected. In the loop
>> that follows I then use the defined colour, myColor1, along with
>> white and the variable r to create shades of myColor1 as in the MWE
>> below. However, myColor1 is not recognised in the loop and seems to
>> be replaced by black, although if I use a predefined colour, in this
>> case BurntSienna from the crayola collection, it works as expected.
>> I have tried a number of ways to get this to work as shown in the
>> code but without success. I would be grateful for any suggestions.
>>
>> Best Wishes
>>
>> Keith McKay
>>
>> %%%%%%%%%%%%%%%%%%%%MWE%%%%%%%%%%%%%
>>
>> \setuppapersize[A4,portrait]
>>
>> \usecolors[crayola]
>>
>> \starttext
>>
>> \dorecurse{10}{
>>
>> \startMPpage
>>
>> StartPage;
>>
>> \definecolor[name="myColor1", r = uniformdeviate(1), g =
>> uniformdeviate(1), b = uniformdeviate(1) ] ;
>>
>
> Remove the backslash in front of the definecolor command.
>
> Wolfgang
>
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