On Sun, 5 Dec 2010, Li Yanrui (李延瑞) wrote:
Hi,
See the following example:
\starttext
\startMPcode
u = 1cm;
xmin = -2.6u;
xmax = 4u;
drawarrow (xmin,0)--(xmax,0);
\stopMPcode
\stoptext
It can be compiled rightly. But when I add the 'label' line into it, see:
\starttext
\startMPcode
u = 1cm;
xmin = -2.6u;
xmax = 4u;
drawarrow (xmin,0)--(xmax,0);
label.lft("hello",(0, 0));
\stopMPcode
\stoptext
Now it can not be compiled and luatex outputs:
mplib : loading 'metafun.mp' (experimental metapost version two)
mplib > mp terminal: ! Redundant equation.
<to be read again>
;
<*> u = 1cm;
xmin = -2.6u; xmax = 4u; drawarrow (xmin,0)--(xmax,0); label.lf...
! Redundant equation.
<to be read again>
Is this a bug or it always need to use 'save' macro to hold these
local variable in metafun?
When a label (or btex ... etex) is present, ConTeXt processes the MP code
twice: once to typeset the labels and then to place to labels. You get a
redundant equation in the second pass.
The easiest way to prevent this is to use := instead of =
Aditya
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