[NTG-context] TeX trigger in MP macro

Peter Rolf indiego at gmx.net
Thu Aug 3 14:29:39 CEST 2006

Hi all,

Currently I am using

  if (\DbgFill=0) :
    fill whatever

in my MP graphics. \DbgFill (0|1) is just a trigger, which prevents
filling in case of visual debugging. Instead of always writing this
'long' form, it should be possible to use a self written mp-macro
instead. But my naive approach

def dbg_fill (expr p) =
  if (\DbgFill=0) :
    fill p ;
enddef ;

doesn't work. I get

>> DbgFill
! Unknown relation will be considered false.

How do I realize this trigger inside pure MP code and set it outside in
TeX? The trigger should be global and can change during runtime. Any
help is welcome.

Greetings, Peter

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