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Subject: Problem with a defined colour in MetaFun
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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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<html>
  <head>
    <meta http-equiv="content-type" content="text/html; charset=UTF-8">
  </head>
  <body>
    <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>
    <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">fill unitsquare xscaled PaperWidth yscaled PaperHeight withcolor  "myColor1";</p>
    <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">for i =2 step 2 until 10:</p>
    <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">r := i/10;</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,i*cm) withcolor(r[\MPcolor{BurntSienna},white]);</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[\MPcolor{myColor1}, white]);</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 (13cm,i*cm) withcolor(r[\MPcolor{"myColor1"}, white]);</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 (13cm,i*cm) withcolor(r[myColor1 ,  white]); This line causes an error.</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;">StopPage;</p>
    <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">\stopMPpage</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="-qt-paragraph-type:empty; 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;">\stoptext</p>
    <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">%%%%%%%%%%%%%%%%%%%%%%%%%%%end MWE%%%%%%%%%%%</p>
    <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">I am running:

</p>
    <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">system          &gt; </p>
    <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">system          &gt; ConTeXt  ver: 2022.04.20 19:18 LMTX  fmt: 2022.4.26  int: english/english</p>
    <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">system          &gt; </p>
    <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">system          &gt; 'cont-new.mkxl' loaded</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>
    <p>

    </p>
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