How to make \framed ignore the width of the rule

* How to make \framed ignore the width of the rule
@ 2007-06-06 23:42 Aditya Mahajan
  2007-06-07 10:16 ` Wolfgang Schuster
  2007-06-07 17:19 ` How to make \framed " Hans Hagen
  0 siblings, 2 replies; 6+ messages in thread
From: Aditya Mahajan @ 2007-06-06 23:42 UTC (permalink / raw)
  To: Context Mailing List List

Hi,

How can I make \framed ignore the width of the rule? I am trying to 
typeset internet protocol headers, but I cannot fully get what I want. 
Here is my attempt:

\unprotect

\makecounter{v!protocolheaderlength}

\defineframed[protocolfieldheader]
             [location=lohi,height=3\lineheight,offset=none,strut=yes]

\def\startprotocolheader
  {\dodoubleempty\dostartprotocolheader}

\def\dostartprotocolheader[#1][#2]%
  {\getparameters[c!protocol][#1]%
   \let\field\protocolheaderfield
   \resetcounter{v!protocolheaderlength}%
   \vbox\bgroup
%    \ruledvbox\bgroup
   \removeunwantedspaces
   \dontleavehmode
   \protocolfieldheader[frame=on,width=\c!protocolbits\c!protocolunitsize]%
   {\let\\\crlf\bold #2}\crlf}

\def\stopprotocoloheader
  {\egroup}

\def\protocolheaderfield#1#2%
  {\doif{\countervalue{v!protocolheaderlength}}{\c!protocolbits}
   {\resetcounter{v!protocolheaderlength}\crlf}%
   \removeunwantedspaces
   \dontleavehmode
   \protocolfieldheader[width=#1\c!protocolunitsize]{\let\\\crlf #2\\(#1)}%
    \incrementcounter{v!protocolheaderlength}{#1}}

\protect

% \showstruts
% \showboxes

\starttext

% Why should unitsize=1mm. Are things being scaled by another factor?
\startprotocolheader[bits=16,unitsize=1mm][General MAC Headers]
  \field    {1}   {HT}
  \field    {1}   {EC}
  \field    {6}   {Type}
  \field    {1}   {ESF}
  \field    {1}   {CI}
  \field    {2}   {EKS}
  \field    {1}   {Rsv}
  \field    {3}   {LEN MSB}
  \field    {8}   {LEN LSB}
  \field    {8}   {CID MSB}
  \field    {8}   {CID LSB}
  \field    {8}   {HCS}
\stopprotocoloheader

\stoptext

Notice that all the lines are not of the same size. It seems that the 
rules of framed are causing the frame to be of a larger width.

Also am I missing a scaling factor in width= expressions above. 
Everything looks fine with unitsize=1mm, but the final figure is 
clearly larger than 16mm. I am confused as to what is happening.

Is there any better way to do this?

Thanks,
Aditya
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