[NTG-context] cropping with \limitatefirstline

Hans Hagen pragma at wxs.nl
Thu Sep 8 17:28:45 CEST 2005


Peter Rolf wrote:

>Hi,
>
>Hans Hagen wrote:
>  
>
>>Peter Rolf wrote:
>>
>>    
>>
>>>Sorry to bother you Hans, but the macro is not working as expected...
>>>
>>>I can see the cropped text (\underbar + special symbols) and there is an
>>>hyphen symbol in the text only example.
>>>
>>>I've added the example code I used for tests with \limitatetext and
>>>\doboundtext.
>>> 
>>>
>>>      
>>>
>>\def\limitatefirstline#1#2#3%
>> {\hbox\bgroup\strut
>>  \setbox\scratchbox\hbox{#1}%
>>  \ifdim\wd\scratchbox>#2\relax
>>    \setbox\scratchbox\hbox{#3}%
>>    \hsize#2\relax
>>    \advance\hsize-\wd\scratchbox
>>    \setbox\scratchbox\vbox{\forgetall\veryraggedright#1}%
>>    \setbox\scratchbox\vsplit\scratchbox to \lineheight
>>    \vbox
>>      {\unvbox\scratchbox
>>       \global\setbox\plusone\lastbox
>>       \global\setbox\plusone\hbox{\unhbox\plusone}}%
>>    
>>
>^^^^
>
>  
>
>>    \box\plusone\removeunwantedspaces#3%
>>  \else
>>    #1%
>>  \fi
>>  \egroup}
>>
>>of course there must be something to break (not possible with the non
>>letters, so there you either need to add \hskip0pt's or do real clipping
>>Hans
>>    
>>
>
>So it fails in any case of nonbreakable text.
>
>How about adding a failsafe test ala
>
>\ifdim\dimexpr\wd\plusone+\wd of sentinel\relax>#2\relax
>  \clip[width=\wd\plusone,...]{...#1...}\removeunwantedspaced#3%
>\else
>  \box\plusone\removeunwantedspaces#3%
>\fi
>
>One (ugly looking) partial character is still better than a bunch of
>characters, that cross the width border.
>
>I have played around with \clip, but it acts a little wild (vertical
>position and height). Can't subdue it myself...
>  
>
\unprotect

\def\limitatefirstline#1#2#3%
  {\hbox\bgroup\strut
   \setbox\scratchbox\hbox{#1}%
   \ifdim\wd\scratchbox>#2\relax
     \setbox\scratchbox\hbox{#3}%
     \hsize#2\relax
     \advance\hsize-\wd\scratchbox
     \setbox\scratchbox\vbox{\forgetall\veryraggedright#1}%
     \setbox\scratchbox\vsplit\scratchbox to \lineheight
     \vbox
       {\unvbox\scratchbox
        \global\setbox\plusone\lastbox
        \global\setbox\plusone\hbox{\unhbox\plusone}%
        \ifx\clip\undefined
          \box\plusone\removeunwantedspaces#3%
        \else\ifdim\wd\plusone>\hsize
          \hbox{\clip[\c!width=\hsize]{\box\plusone}#3}%
        \else
          \box\plusone\removeunwantedspaces#3%
        \fi\fi}%
   \else
     #1%
   \fi
   \egroup}

\protect

\ruledhbox{\limitatefirstline{xxxxxxxxxxxxxxxxxxxx}{3cm}{...}}


now you owe this list at least three wiki pages -) 

Hans 

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