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From: Keith McKay via ntg-context <ntg-context@ntg.nl>
Newsgroups: gmane.comp.tex.context
Subject: Re: Problem with a defined colour in MetaFun
Date: Fri, 29 Apr 2022 14:19:28 +0100
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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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<html>
  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
  </head>
  <body>
    <p>Hi Wolfgang,</p>
    <p>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 <b>resolvedcolor</b> helper which I used as follows:

</p>
    <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">definecolor [name = "myColor",  r = uniformdeviate(1), g = uniformdeviate(1), b = uniformdeviate(1)];</p>
    <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">for loop..</p>
    <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">	fill unitsquare xscaled 5cm yscaled .5cm shifted (7cm,i*cm) withcolor(r[resolvedcolor("myColor"), white]);</p>
    <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">endfor;</p>
    <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">
</p>
    <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">I also found the <b>namedcolor</b> helper and I could use it as follows:</p>
    <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">
</p>
    <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">fill unitsquare xscaled 5cm yscaled .5cm shifted (1cm,(2*i)*cm) withcolor namedcolor("myColor2") ;</p>
    <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">
</p>
    <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">However, for some reason it did not work in:</p>
    <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">
</p>
    <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">fill unitsquare xscaled 5cm yscaled .5cm shifted (7cm,i*cm) withcolor(r[namedcolor("myColor"), white]);</p>
    <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;"><i>
</i></p>
    <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">Thanks again for your suggestion<i>
</i></p>
    <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">Best Wishes</p>
    <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">Keith<i>
</i></p>
    <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;"><style type="text/css">p, li { white-space: pre-wrap; }</style></p>
    <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;"><style type="text/css">p, li { white-space: pre-wrap; }</style></p>
    <p><style type="text/css">p, li { white-space: pre-wrap; }</style></p>
    <div class="moz-cite-prefix">On 28/04/2022 16:04, Wolfgang Schuster
      wrote:<br>
    </div>
    <blockquote type="cite"
      cite="mid:53af5dbe-fabd-6dc8-8dc7-8b86e44d8ba5@gmail.com">
      <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
      <span>Keith McKay via ntg-context schrieb am 28.04.2022 um 12:05:</span><br>
      <blockquote type="cite"
        cite="mid:3fc7c602-d9de-6b68-e771-240eebee4cb8@gmail.com">
        <meta http-equiv="content-type" content="text/html;
          charset=UTF-8">
        <p>Hi,</p>
        <p>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.</p>
        <p>Best Wishes</p>
        <p>Keith McKay</p>
        <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; 
margin-right:0px; -qt-block-indent:0; text-indent:0px;">%%%%%%%%%%%%%%%%%%%%MWE%%%%%%%%%%%%%</p>
        <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; 
margin-right:0px; -qt-block-indent:0; text-indent:0px;">\setuppapersize[A4,portrait]</p>
        <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; 
margin-right:0px; -qt-block-indent:0; text-indent:0px;">\usecolors[crayola]</p>
        <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; 
margin-right:0px; -qt-block-indent:0; text-indent:0px;">\starttext</p>
        <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; 
margin-right:0px; -qt-block-indent:0; text-indent:0px;">\dorecurse{10}{</p>
        <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; 
margin-right:0px; -qt-block-indent:0; text-indent:0px;">\startMPpage</p>
        <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; 
margin-right:0px; -qt-block-indent:0; text-indent:0px;">StartPage;</p>
        <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; 
margin-right:0px; -qt-block-indent:0; text-indent:0px;">\definecolor[name="myColor1",
 r =  uniformdeviate(1), g = uniformdeviate(1), b = uniformdeviate(1) ] ;</p>
      </blockquote>
      <br>
      Remove the backslash in front of the definecolor command.<br>
      <br>
      Wolfgang<br>
      <br>
    </blockquote>
  </body>
</html>

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