[luatex] shapemode inside vbox

[Ulrike Fischer]

Am Wed, 10 Apr 2019 15:10:36 +0200 schrieb Javier Bezos:

> I don't understand the logic of the \parshape's in the
> plain document below. The problem is the \parshape with
> \shapemode=2 (or 3) inside the \vbox.

I don't understand the behaviour of \shapemode on \parshape at all
;-(. Even if I let out confusing changes of directions. 

I asked a question once (with no answer):
https://tug.org/pipermail/luatex/2017-November/006641.html

Or look at the following. Why is the second value of the \parshape
mirrored but not the first?

\parindent0pt

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
eiusmod
tempor incididunt ut labore et dolore magna aliqua.

\hrule

\parshape 2 .1\hsize .9\hsize 0.2\hsize 0.8\hsize \shapemode=0
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
eiusmod
tempor incididunt ut labore et dolore magna aliqua. tempor
incididunt ut labore et dolore magna aliqua.
tempor incididunt ut labore et dolore magna aliqua. tempor
incididunt ut labore et dolore magna aliqua.


\shapemode=2 \parshape 2 .1\hsize .9\hsize 0.2\hsize 0.8\hsize
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
eiusmod
tempor incididunt ut labore et dolore magna aliqua. tempor
incididunt ut labore et dolore magna aliqua.
tempor incididunt ut labore et dolore magna aliqua. tempor
incididunt ut labore et dolore magna aliqua.

\bye


-- 
Ulrike Fischer 
http://www.troubleshooting-tex.de/