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From: Gerben Wierda <gerben.wierda@rna.nl>
Newsgroups: gmane.comp.tex.context
Subject: Would it be possible in LMTX to do something like
 variable font/lineheight to fit a fixed frame?
Date: Sun, 10 May 2020 20:34:31 +0200
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Suppose I have a fixed sized frame, say 3 y 4 cm. And I have a =
variable-length text.

Would it be possible to write a macro that scaled the font and line =
height such that the text will fit in the frame?

What I have now is very basic:
	Fixed width
	Typeset (METAPOST textext())
	If too high
	METAPOST: scale down so it fits in frame

But the scaling wil scale both height and width so it doesn=E2=80=99t =
only go to the correct height, it also gets too narrow. Just scaling in =
the vertical direction squashes the text/font.

What would be great is some way to have the font size and lineheight =
result from TeX trying to fit it inside a predetermined size.

Doesn=E2=80=99t need to be perfect, a good approximation will do. I=E2=80=99=
ve been thinking about using the surface size difference between desired =
box size and the result of textext() as an approach to guess a right =
fontsize and line height.

What could make it possible for me too is a way to do a typeset command =
from lua that gives me the box sizes of typesetting without actually =
typesetting it to the true output of the job. Something like
typeset a piece of text without actually outputting it to the PDF output =
in a width (say 4)
get the width and height of the result (say 4 x 6)
Adapt front size and lineheight (from 4x6 to 4x3 means a 50% reduction, =
which may be too much as the result may have just a syllable on the last =
line)
typeset for real in 50% size
Is that doable? Or is there a better way?
	=20

G=

--Apple-Mail=_21752363-5575-4BDE-A8A2-0E120DEEEEDC
Content-Transfer-Encoding: quoted-printable
Content-Type: text/html;
	charset=utf-8

<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html; =
charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; line-break: after-white-space;" =
class=3D"">Suppose I have a fixed sized frame, say 3 y 4 cm. And I have =
a variable-length text.<div class=3D""><br class=3D""></div><div =
class=3D"">Would it be possible to write a macro that scaled the font =
and line height such that the text will fit in the frame?</div><div =
class=3D""><br class=3D""></div><div class=3D"">What I have now is very =
basic:</div><div class=3D""><span class=3D"Apple-tab-span" =
style=3D"white-space:pre">	</span>Fixed width</div><div =
class=3D""><span class=3D"Apple-tab-span" style=3D"white-space:pre">	=
</span>Typeset (METAPOST textext())</div><div class=3D""><span =
class=3D"Apple-tab-span" style=3D"white-space:pre">	</span>If too =
high</div><div class=3D""><span class=3D"Apple-tab-span" =
style=3D"white-space:pre">	</span>METAPOST: scale down so it fits =
in frame</div><div class=3D""><br class=3D""></div><div class=3D"">But =
the scaling wil scale both height and width so it doesn=E2=80=99t only =
go to the correct height, it also gets too narrow. Just scaling in the =
vertical direction squashes the text/font.</div><div class=3D""><br =
class=3D""></div><div class=3D"">What would be great is some way to have =
the font size and lineheight result from TeX trying to fit it inside a =
predetermined size.</div><div class=3D""><br class=3D""></div><div =
class=3D"">Doesn=E2=80=99t need to be perfect, a good approximation will =
do. I=E2=80=99ve been thinking about using the surface size difference =
between desired box size and the result of textext() as an approach to =
guess a right fontsize and line height.</div><div class=3D""><br =
class=3D""></div><div class=3D"">What could make it possible for me too =
is a way to do a typeset command from lua that gives me the box sizes of =
typesetting without actually typesetting it to the true output of the =
job. Something like</div><div class=3D""><ul class=3D""><li =
class=3D"">typeset a piece of text without actually outputting it to the =
PDF output in a width (say 4)</li><li class=3D"">get the width and =
height of the result (say 4 x 6)</li><li class=3D"">Adapt front size and =
lineheight (from 4x6 to 4x3 means a 50% reduction, which may be too much =
as the result may have just a syllable on the last line)</li><li =
class=3D"">typeset for real in 50% size</li></ul></div><div class=3D"">Is =
that doable? Or is there a better way?</div><div class=3D""><span =
class=3D"Apple-tab-span" style=3D"white-space:pre">	=
</span>&nbsp;</div><div class=3D""><br class=3D""></div><div =
class=3D"">G</div></body></html>=

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