On 1/14/2014 12:13 AM, Elspeth McGullicuddy wrote:
Hi,
1- I put here a far too long example to show difficulties that I have
with formulas in conjunction with framed:
I haven't find a way to insert a formula (displaystyle, vertical
mode), at the beginning of a \framed.
Here is a small example:
\nopdfcompression
\startTEXpage[offset=3cm]
\hbox{$ x+y $}
\stopTEXpage
If you look in the pdf file you will see the following:
/FontBBox [-1042 -3060 4082 3560]
/Ascent 3560
/CapHeight 683
/Descent -3060
/ItalicAngle 0
/StemV 93
/XHeight 431
The less clever viewer can use that information for the selection
dimensions. Acrobat instead uses the glyph properties.
If you run instead
\starttext
\hbox{$$ x+y $$}
\stoptext
you will not get math at all because the $$ == an empty inline math so
there a text font is used:
/FontBBox [-422 -280 1394 1127]
/Ascent 1127
/CapHeight 683
/Descent -280
/ItalicAngle 0
/StemV 91
/XHeight 431
In context,
\hbox{\startformula x+y \stopformula}
boils down to
\hbox{\par $$ x+y $$ \par}
plus some more so i decided to turn this into
\hbox{\par \Ustartdisplaymath x+y \Ustopdisplaymath \par}
Now, believe it it not, when I tested that one luatex crashed as we
never thought about the fact that $$ is catched in the main loop and
\Ustartdisplaymath falls through and creates havoc. So, after some
debugging Luigi and I figured out that this was too messy to catch. Math
magician Taco will fix it in luatex's parser part. So, be warned, don't
this this trickery now.
In the meantime, i fixed context to deal with such matters. Of course
that bug doesn't relate to your observations.
Hans
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