On 1/16/2017 8:31 PM, Sergey Slyusarev wrote:
the (subtle) difference between the two [*MPinclusions and
*/MPinitializations/] is not a bug but a feature
If I understood correctly, *MPinitializations affects everything and can't be
assigned to a specific instance (or can it?),
in some cases (like mine) this difference is not so subtle.
Look at the following example (not so minimal):
\startMPinitializations
picture p;
p := image(
draw fullsquare scaled 1cm;
draw textext("1");
);
\stopMPinitializations
\startMPinitializations
picture s;
s := image(
draw (fullsquare rotated 45) scaled 1cm;
draw textext("2");
);
\stopMPinitializations
\defineMPinstance[foo][initializations=yes]
\startMPcode{foo}
picture q;
q := image(
draw fullcircle scaled 1cm;
draw textext("3");
);
draw q;
\stopMPcode
\startMPcode{foo}
draw p;
draw q shifted (2cm, 0);
draw s shifted (4cm, 0);
\stopMPcode
\defineMPinstance[bar][initializations=yes]
\startMPcode{bar}
picture r;
r := image(
draw fullcircle scaled 1cm;
draw textext("4");
);
draw r;
\stopMPcode
\startMPcode{bar}
draw p;
draw r shifted (2cm, 0);
draw s shifted (4cm, 0);
\stopMPcode
First, it shows why *MPinitializations can't replace *MPinclusions for
me (it affects all instances),
and second, it silently produces produces some really unexpected results:
It looks like it should produce (by line)
A circle with "3" inside (yes)
A square with "1" inside (yes); A circle with "3" inside again (no,
instead it produces circle with "2" inside); A rhombus with "2" inside
(no, instead it produces a rhombus with "1")
and so on.
(tested on http://live.contextgarden.net/)
In fact, I failed to declare picture variable inside with text inside
one *MPcode environment and pass it to another safely
(text either disappears or changes to other text, and this time ConTeXt
returns no error), that surely is a bug?
no, it's the way it works ... but keep in mind that textexts are
something bound to a specific code snippet so you can bets do something
like this:
\starttext
\defineMPinstance[foo][definitions=yes]
\defineMPinstance[bar][definitions=yes]
\startMPdefinitions{foo}
vardef p =
image(
draw fullsquare scaled 1cm;
draw textext("1");
)
enddef ;
\stopMPdefinitions
\startMPdefinitions{bar}
vardef p =
image(
draw (fullsquare rotated 45) scaled 1cm;
draw textext("2");
)
enddef;
\stopMPdefinitions
\startMPcode{foo}
draw p;
draw image(
draw fullcircle scaled 1cm;
draw textext("3");
);
draw p;
\stopMPcode
\startMPcode{bar}
draw p;
draw image(
draw fullcircle scaled 1cm;
draw textext("4");
);
\stopMPcode
\stoptext
-----------------------------------------------------------------
Hans Hagen | PRAGMA ADE
Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
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