Problem with a defined colour in MetaFun

Problem with a defined colour in MetaFun

[Keith McKay via ntg-context]

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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) ] ;

fill unitsquare xscaled PaperWidth yscaled PaperHeight withcolor "myColor1";

for i =2 step 2 until 10:

r := i/10;

fill unitsquare xscaled 5cm yscaled .5cm shifted (1cm,i*cm) 
withcolor(r[\MPcolor{BurntSienna},white]);

fill unitsquare xscaled 5cm yscaled .5cm shifted (7cm,i*cm) 
withcolor(r[\MPcolor{myColor1}, white]);

fill unitsquare xscaled 5cm yscaled .5cm shifted (13cm,i*cm) 
withcolor(r[\MPcolor{"myColor1"}, white]);

%fill unitsquare xscaled 5cm yscaled .5cm shifted (13cm,i*cm) 
withcolor(r[myColor1 , white]); This line causes an error.

endfor;

StopPage;

\stopMPpage

}

\stoptext

%%%%%%%%%%%%%%%%%%%%%%%%%%%end MWE%%%%%%%%%%%

I am running:

system >

system > ConTeXt ver: 2022.04.20 19:18 LMTX fmt: 2022.4.26 int: 
english/english

system >

system > 'cont-new.mkxl' loaded

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Re: Problem with a defined colour in MetaFun

[Fabrice L via ntg-context]

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Hi Keith,

> Le 28 avr. 2022 à 06:05, Keith McKay via ntg-context <ntg-context@ntg.nl> a écrit :
> 
> 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) ] ;
> fill unitsquare xscaled PaperWidth yscaled PaperHeight withcolor  "myColor1";
> for i =2 step 2 until 10:
> r := i/10;
> fill unitsquare xscaled 5cm yscaled .5cm shifted (1cm,i*cm) withcolor(r[\MPcolor{BurntSienna},white]);
> fill unitsquare xscaled 5cm yscaled .5cm shifted (7cm,i*cm) withcolor(r[\MPcolor{myColor1}, white]);
> fill unitsquare xscaled 5cm yscaled .5cm shifted (13cm,i*cm) withcolor(r[\MPcolor{"myColor1"}, white]);
> %fill unitsquare xscaled 5cm yscaled .5cm shifted (13cm,i*cm) withcolor(r[myColor1 ,  white]); This line causes an error.
> endfor;
> StopPage;
> \stopMPpage
> }
> 
> \stoptext
> %%%%%%%%%%%%%%%%%%%%%%%%%%%end MWE%%%%%%%%%%%
> 

Here is a solution, with works here, defining in another way the color «  myColor »:

\setuppapersize[A4,portrait]
\usecolors[crayola]
\starttext
\dorecurse{2}{
\startMPpage
StartPage;
color myColor ;
myColor := (uniformdeviate(1),uniformdeviate(1),uniformdeviate(1));
fill unitsquare xscaled PaperWidth yscaled PaperHeight withcolor myColor;
for i =2 step 2 until 10:
r := i/10;
fill unitsquare xscaled 5cm yscaled .5cm shifted (1cm,i*cm) withcolor(r[\MPcolor{BurntSienna},white]);
fill unitsquare xscaled 5cm yscaled .5cm shifted (7cm,i*cm) withcolor(r[\MPcolor{myColor1}, white]);
fill unitsquare xscaled 5cm yscaled .5cm shifted (13cm,i*cm) withcolor(r[\MPcolor{"myColor1"}, white]);
%fill unitsquare xscaled 5cm yscaled .5cm shifted (13cm,i*cm) withcolor(r[myColor1 ,  white]); This line causes an error.
endfor;
StopPage;
\stopMPpage
}

\stoptext

Fabrice.
> 
>     
> ___________________________________________________________________________________
> If your question is of interest to others as well, please add an entry to the Wiki!
> 
> maillist : ntg-context@ntg.nl <mailto:ntg-context@ntg.nl> / http://www.ntg.nl/mailman/listinfo/ntg-context <http://www.ntg.nl/mailman/listinfo/ntg-context>
> webpage  : http://www.pragma-ade.nl <http://www.pragma-ade.nl/> / http://context.aanhet.net <http://context.aanhet.net/>
> archive  : https://bitbucket.org/phg/context-mirror/commits/ <https://bitbucket.org/phg/context-mirror/commits/>
> wiki     : http://contextgarden.net <http://contextgarden.net/>
> ___________________________________________________________________________________


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___________________________________________________________________________________

Re: Problem with a defined colour in MetaFun

[Fabrice L via ntg-context]

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Sorry, I was a little too enthusiastic, here here is the code :

> Le 28 avr. 2022 à 08:41, Fabrice L <fabrice.alpha@gmail.com> a écrit :
> 
> Hi Keith,
> 
>> Le 28 avr. 2022 à 06:05, Keith McKay via ntg-context <ntg-context@ntg.nl <mailto:ntg-context@ntg.nl>> a écrit :
>> 
>> 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) ] ;
>> fill unitsquare xscaled PaperWidth yscaled PaperHeight withcolor  "myColor1";
>> for i =2 step 2 until 10:
>> r := i/10;
>> fill unitsquare xscaled 5cm yscaled .5cm shifted (1cm,i*cm) withcolor(r[\MPcolor{BurntSienna},white]);
>> fill unitsquare xscaled 5cm yscaled .5cm shifted (7cm,i*cm) withcolor(r[\MPcolor{myColor1}, white]);
>> fill unitsquare xscaled 5cm yscaled .5cm shifted (13cm,i*cm) withcolor(r[\MPcolor{"myColor1"}, white]);
>> %fill unitsquare xscaled 5cm yscaled .5cm shifted (13cm,i*cm) withcolor(r[myColor1 ,  white]); This line causes an error.
>> endfor;
>> StopPage;
>> \stopMPpage
>> }
>> 
>> \stoptext
>> %%%%%%%%%%%%%%%%%%%%%%%%%%%end MWE%%%%%%%%%%%
>> 
> 
> Here is a solution, with works here, defining in another way the color «  myColor »:
> 
> \setuppapersize[A4,portrait]
> \usecolors[crayola]
> \starttext
> \dorecurse{2}{
> \startMPpage
> StartPage;
> color myColor ;
> myColor := (uniformdeviate(1),uniformdeviate(1),uniformdeviate(1));
> fill unitsquare xscaled PaperWidth yscaled PaperHeight withcolor myColor;
> for i =2 step 2 until 10:
> r := i/10;
> fill unitsquare xscaled 5cm yscaled .5cm shifted (1cm,i*cm) withcolor(r[\MPcolor{BurntSienna},white]);
> fill unitsquare xscaled 5cm yscaled .5cm shifted (7cm,i*cm) withcolor(r[\MPcolor{myColor1}, white]);
> fill unitsquare xscaled 5cm yscaled .5cm shifted (13cm,i*cm) withcolor(r[\MPcolor{"myColor1"}, white]);
> %fill unitsquare xscaled 5cm yscaled .5cm shifted (13cm,i*cm) withcolor(r[myColor1 ,  white]); This line causes an error.
> endfor;
> StopPage;
> \stopMPpage
> }
> 
> \stoptext

I forgot to remove « myColor1 » from the others parts of the code. 
\setuppapersize[A4,portrait]
\usecolors[crayola]
\starttext
\dorecurse{10}{
\startMPpage
StartPage;
color myColor ;
myColor := (uniformdeviate(1),uniformdeviate(1),uniformdeviate(1));
fill unitsquare xscaled PaperWidth yscaled PaperHeight withcolor myColor;
for i =2 step 2 until 10:
r := i/10;
fill unitsquare xscaled 5cm yscaled .5cm shifted (1cm,i*cm) withcolor(r[\MPcolor{BurntSienna},white]);
fill unitsquare xscaled 5cm yscaled .5cm shifted (7cm,i*cm) withcolor(r[myColor, white]);
fill unitsquare xscaled 5cm yscaled .5cm shifted (13cm,i*cm) withcolor(r[myColor, white]);
%fill unitsquare xscaled 5cm yscaled .5cm shifted (13cm,i*cm) withcolor(r[myColor1 ,  white]); This line causes an error.
endfor;
StopPage;
\stopMPpage
}

\stoptext


> 
> Fabrice.
>> 
>>     
>> ___________________________________________________________________________________
>> If your question is of interest to others as well, please add an entry to the Wiki!
>> 
>> maillist : ntg-context@ntg.nl <mailto:ntg-context@ntg.nl> / http://www.ntg.nl/mailman/listinfo/ntg-context <http://www.ntg.nl/mailman/listinfo/ntg-context>
>> webpage  : http://www.pragma-ade.nl <http://www.pragma-ade.nl/> / http://context.aanhet.net <http://context.aanhet.net/>
>> archive  : https://bitbucket.org/phg/context-mirror/commits/ <https://bitbucket.org/phg/context-mirror/commits/>
>> wiki     : http://contextgarden.net <http://contextgarden.net/>
>> ___________________________________________________________________________________


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___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
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___________________________________________________________________________________

Re: Problem with a defined colour in MetaFun

[Wolfgang Schuster via ntg-context]

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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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___________________________________________________________________________________

Re: Problem with a defined colour in MetaFun

[Keith McKay via ntg-context]

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Hi Fabrice

Thank you for your reply. It works the way I wanted. Wolfgang also 
replied and this has lead me to an alternative method. See my reply to 
him in this mailing list.

Best Wishes

Keith

On 28/04/2022 13:45, Fabrice L wrote:
> Sorry, I was a little too enthusiastic, here here is the code :
>
>> Le 28 avr. 2022 à 08:41, Fabrice L <fabrice.alpha@gmail.com> a écrit :
>>
>> Hi Keith,
>>
>>> Le 28 avr. 2022 à 06:05, Keith McKay via ntg-context 
>>> <ntg-context@ntg.nl> a écrit :
>>>
>>> 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) ] ;
>>> fill unitsquare xscaled PaperWidth yscaled PaperHeight withcolor 
>>> "myColor1";
>>> for i =2 step 2 until 10:
>>> r := i/10;
>>> fill unitsquare xscaled 5cm yscaled .5cm shifted (1cm,i*cm) 
>>> withcolor(r[\MPcolor{BurntSienna},white]);
>>> fill unitsquare xscaled 5cm yscaled .5cm shifted (7cm,i*cm) 
>>> withcolor(r[\MPcolor{myColor1}, white]);
>>> fill unitsquare xscaled 5cm yscaled .5cm shifted (13cm,i*cm) 
>>> withcolor(r[\MPcolor{"myColor1"}, white]);
>>> %fill unitsquare xscaled 5cm yscaled .5cm shifted (13cm,i*cm) 
>>> withcolor(r[myColor1 , white]); This line causes an error.
>>> endfor;
>>> StopPage;
>>> \stopMPpage
>>> }
>>>
>>> \stoptext
>>> %%%%%%%%%%%%%%%%%%%%%%%%%%%end MWE%%%%%%%%%%%
>>
>> Here is a solution, with works here, defining in another way the 
>> color «  myColor »:
>>
>> \setuppapersize[A4,portrait]
>> \usecolors[crayola]
>> \starttext
>> \dorecurse{2}{
>> \startMPpage
>> StartPage;
>> color myColor ;
>> myColor := (uniformdeviate(1),uniformdeviate(1),uniformdeviate(1));
>> fill unitsquare xscaled PaperWidth yscaled PaperHeight withcolor myColor;
>> for i =2 step 2 until 10:
>> r := i/10;
>> fill unitsquare xscaled 5cm yscaled .5cm shifted (1cm,i*cm) 
>> withcolor(r[\MPcolor{BurntSienna},white]);
>> fill unitsquare xscaled 5cm yscaled .5cm shifted (7cm,i*cm) 
>> withcolor(r[\MPcolor{myColor1}, white]);
>> fill unitsquare xscaled 5cm yscaled .5cm shifted (13cm,i*cm) 
>> withcolor(r[\MPcolor{"myColor1"}, white]);
>> %fill unitsquare xscaled 5cm yscaled .5cm shifted (13cm,i*cm) 
>> withcolor(r[myColor1 ,  white]); This line causes an error.
>> endfor;
>> StopPage;
>> \stopMPpage
>> }
>>
>> \stoptext
>
> I forgot to remove « myColor1 » from the others parts of the code.
> \setuppapersize[A4,portrait]
> \usecolors[crayola]
> \starttext
> \dorecurse{10}{
> \startMPpage
> StartPage;
> color myColor ;
> myColor := (uniformdeviate(1),uniformdeviate(1),uniformdeviate(1));
> fill unitsquare xscaled PaperWidth yscaled PaperHeight withcolor myColor;
> for i =2 step 2 until 10:
> r := i/10;
> fill unitsquare xscaled 5cm yscaled .5cm shifted (1cm,i*cm) 
> withcolor(r[\MPcolor{BurntSienna},white]);
> fill unitsquare xscaled 5cm yscaled .5cm shifted (7cm,i*cm) 
> withcolor(r[myColor, white]);
> fill unitsquare xscaled 5cm yscaled .5cm shifted (13cm,i*cm) 
> withcolor(r[myColor, white]);
> %fill unitsquare xscaled 5cm yscaled .5cm shifted (13cm,i*cm) 
> withcolor(r[myColor1 ,  white]); This line causes an error.
> endfor;
> StopPage;
> \stopMPpage
> }
>
> \stoptext
>
>
>>
>> Fabrice.
>>> ___________________________________________________________________________________
>>> If your question is of interest to others as well, please add an 
>>> entry to the Wiki!
>>>
>>> maillist 
>>> :ntg-context@ntg.nl/http://www.ntg.nl/mailman/listinfo/ntg-context
>>> webpage  :http://www.pragma-ade.nl/http://context.aanhet.net
>>> archive  :https://bitbucket.org/phg/context-mirror/commits/
>>> wiki     :http://contextgarden.net
>>> ___________________________________________________________________________________
>

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If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
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___________________________________________________________________________________

Re: Problem with a defined colour in MetaFun

[Keith McKay via ntg-context]

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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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___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
wiki     : http://contextgarden.net
___________________________________________________________________________________