Re: Length range control of the last line of paragraph

[Hans Hagen <pragma@wxs.nl>]

On 3/25/2016 2:40 PM, Jan Tosovsky wrote:
> On 2016-03-24 Hans Hagen wrote:
>> On 3/24/2016 8:36 PM, Jan Tosovsky wrote:
>>>
>>> We basically need:
>>> <text><glue min-width='XX' max-width='hsize-3*indent'>
>>>
>>> and I thought this is exactly what \parfillskip ensures
>>> \parfillskip XX plus (hsize - 3*indent)
>>>
>>
>> the fil is taken into account when calculating the best break points
>> and then the XX is fixed but plus/minus can lead to if being less
>> or more, all relative to other fill (distributed)
>>
>> so, XX plus (hsize - 3*indent) is not a fixed value, it's XX or more
>>
>> take this:
>>
>> \ruledhbox to 10cm {x\hskip0pt plus 1cm x}
>>
>> the skip will stretch more than 1cm
>
> I can see.
>
> But sorry for my ignorance, as far as I understand, \parfillskip is added to the end of the paragraph, so we have rather
> \ruledhbox to 10cm {x\hskip0pt plus 1cm} % without that 'x' at the end, so no 'glue' distribution is performed

there is but not enough stretch so there will be a warning ... you can 
see it from

\ruledhbox to 10cm {x}
\ruledhbox to 10cm {x\hskip0pt plus 1cm}
\ruledhbox to 10cm {x\hskip0pt plus 1fill}


> If '\parfillskip 2em plus (hsize - 3*(2em) - 2em)' is specified, I still think we should get space of width at least 2em '####' which can be extended as indicated by hyphens '-' here:
>
> emememememememememememememememememememem
> emememememem------------------------####
>
> So there are two last line lengths extrems:
> (shortest)
> emememememememememememememememememememem
> emememememem
>
> (longest)
> emememememememememememememememememememem
> emememememememememememememememememem
>
> I slightly modified your example and even with verystrict settings all seems to be fine (except too narrow blocks, which is not my use case).
>
> \showmakeup[glue]
>
> \setupindenting[yes,2em]
>
> \edef\ward{\cldloadfile{ward}}
>
> \setupalign[verystrict,hz]
>
> \starttext
> \dorecurse{100}{
>       \hsize\dimexpr\textwidth-#1mm\relax
>       \dimen0=\hsize
>       \advance\dimen0 by -8em % 3*em - 2em
>       \parfillskip 2em plus \dimen0\relax
>       \ward  \par
>       \parfillskip 2em plus \dimen0\relax
>       \ward  \par
>       \startnarrower[left]
>           \parfillskip 2em plus \dimen0\relax
>           \ward \par
>       \stopnarrower
>       \startnarrower[left]
>           \parfillskip 2em plus \dimen0\relax
>           \ward \par
>       \stopnarrower
>       \page
> }
> \stoptext
>
> The problem here this settings cannot be done globally if there are various block widths.

you always add a 2em skip so there will never be a word touching the 
right margin in the last line; furthermore you permit some stretch, but 
as said before this stretch is not frozen, it's a ratio relative to 
other stretch

\ruledhbox to 10cm {x\hskip2em plus 1cm x\hskip2em plus 1cm x}

so, the plus 1cm can become more than that depending on needs (onlky the 
warning is influenced

> Can I somehow define command globally which takes local block widths?
>
> \parfillskip #1 plus \localhsize-#1-#2, where
> #1 gap width
> #2 shortest line width

\availablehsize

i think that the #1 gap is irrelevant and actually makes it worse as it 
add space while you actually want it to move the other direction

anyway, this is why using a couple of non-hyphenated words or a minimum 
amount of characters makes more sense

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                                           Hans Hagen | PRAGMA ADE
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