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From: Geert Verhaag <verhaaggchm@ziggo.nl>
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Subject: Struggling with startuseMPgraphic and string argument!
Date: Wed, 16 Sep 2020 16:32:00 +0200
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Hi,

I'm trying to pass a string argument value to an MPgraphic but it 
doesn't seem to work:

Tried the following:

\startuseMPgraphic{name}{lbl}
   pair a ; a := (3cm,3cm) ;label.top("\MPvariable{lbl}",a) ;
\stopuseMPgraphic

\starttext
   \useMPgraphic{name}{lbl=1}
\stoptext

The above works as expected!

But the following doesn't:

\startuseMPgraphic{name}{lbl}
   pair a ; a := (3cm,3cm) ;label.top("\MPvariable{lbl}",a) ;
\stopuseMPgraphic

\starttext
   \useMPgraphic{name}{lbl=abc}
\stoptext

It yields:

  1 \startuseMPgraphic{name}{lbl}
  2       pair a ; a := (3cm,3cm) ;label.top("\MPvariable{lbl}",a) ;
  3     \stopuseMPgraphic
  4
  5     %\startuseMPgraphic{name}fill fullcircle scaled 200pt withcolor 
.625yellow ;\stopuseMPgraphic
  6
  7     \starttext
  8      Example:
  9 >>    \useMPgraphic{name}{lbl=abc}
10     \stoptext
11

<to be read again>
a
\m_meta_current_variable a-a
                             bc
<argument> ... \hbox {\scratchdimen \m_meta_current_variable
                                                   sp}\ifzeropt \wd 
\b_meta_v...
\secondoftwoarguments #1#2b-#2

\9>>1 #1,2-\meta_prepare_instance_variable {#1}
\syst_helpers_do_process_comm...
\syst_helpers_do_process_comma_list ...rgument #1,
                                                   ]\relax \global 
\advance \...
...
l.9   \useMPgraphic{name}{lbl=abc}

So it seems that only numbers can be passed not character strings! Why 
is that? Is there a possibility to achieve this functionality?

Regards,
Gerard


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<html>
  <head>

    <meta http-equiv="content-type" content="text/html; charset=UTF-8">
  </head>
  <body>
    <p>Hi,</p>
    <p>I'm trying to pass a string argument value to an MPgraphic but it
      doesn't seem to work:</p>
    <p>Tried the following:</p>
    <p><font face="FreeMono">\startuseMPgraphic{name}{lbl}<br>
          pair a ; a := (3cm,3cm) ;label.top("\MPvariable{lbl}",a) ;<br>
        \stopuseMPgraphic<br>
        <br>
        \starttext<br>
          \useMPgraphic{name}{lbl=1}<br>
        \stoptext</font><br>
    </p>
    <div class="moz-signature">The above works as expected!</div>
    <div class="moz-signature"><br>
    </div>
    <div class="moz-signature">But the following doesn't:</div>
    <div class="moz-signature"><br>
    </div>
    <div class="moz-signature"><font face="FreeMono">\startuseMPgraphic{name}{lbl}<br>
          pair a ; a := (3cm,3cm) ;label.top("\MPvariable{lbl}",a) ;<br>
        \stopuseMPgraphic<br>
        <br>
        \starttext<br>
          \useMPgraphic{name}{lbl=abc}<br>
        \stoptext</font></div>
    <div class="moz-signature"><font face="FreeMono"><br>
      </font></div>
    <div class="moz-signature">It yields:</div>
    <div class="moz-signature"><font face="FreeMono"><br>
      </font></div>
    <div class="moz-signature"><font face="FreeMono"> 1    
        \startuseMPgraphic{name}{lbl}<br>
         2       pair a ; a := (3cm,3cm)
        ;label.top("\MPvariable{lbl}",a) ;<br>
         3     \stopuseMPgraphic<br>
         4     <br>
         5     %\startuseMPgraphic{name}fill fullcircle scaled 200pt
        withcolor .625yellow ;\stopuseMPgraphic<br>
         6     <br>
         7     \starttext<br>
         8      Example:<br>
         9 &gt;&gt;    \useMPgraphic{name}{lbl=abc}<br>
        10     \stoptext<br>
        11     <br>
        <br>
        &lt;to be read again&gt; <br>
        a<br>
        \m_meta_current_variable a-a<br>
                                    bc<br>
        &lt;argument&gt; ... \hbox {\scratchdimen
        \m_meta_current_variable <br>
                                                          sp}\ifzeropt
        \wd \b_meta_v...<br>
        \secondoftwoarguments #1#2b-#2<br>
                                      <br>
        \9&gt;&gt;1 #1,2-\meta_prepare_instance_variable {#1}<br>
                                                      
        \syst_helpers_do_process_comm...<br>
        \syst_helpers_do_process_comma_list ...rgument #1,<br>
                                                          ]\relax
        \global \advance \...<br>
        ...<br>
        l.9   \useMPgraphic{name}{lbl=abc}<br>
      </font></div>
    <div class="moz-signature"><br>
    </div>
    <div class="moz-signature">So it seems that only numbers can be
      passed not character strings! Why is that? Is there a possibility
      to achieve this functionality?<br>
    </div>
    <div class="moz-signature"><br>
    </div>
    <div class="moz-signature">Regards,</div>
    <div class="moz-signature">Gerard<br>
      <meta http-equiv="content-type" content="text/html; charset=UTF-8">
      <title></title>
      <br>
      <div class="moz-signature"></div>
    </div>
  </body>
</html>

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