Am 01.05.2014 um 20:00 schrieb Aditya Mahajan <adit...@umich.edu>:
> On Thu, 1 May 2014, Mikael P. Sundqvist wrote:
>> \startluacode
>> userdata = userdata or {}
>> function userdata.lundklippfyllbild(str, bredd, hojd)
>> if tex.dimen[0] / tex.dimen[2] < tex.dimen[4] / tex.dimen[6] then
>> local skalning =
>> -0.5*(tex.dimen[4]/tex.dimen[0]*tex.dimen[2]-tex.dimen[6])
>> context("\\vskip%ssp", skalning)
>> context.externalfigure({str},{width=bredd})
>> context.sprint("foo")
>> else
>> local skalning =
>> -0.5*(tex.dimen[6]/tex.dimen[2]*tex.dimen[0]-tex.dimen[4])
>> context("\\hskip%ssp", skalning)
>> context.externalfigure({str},{height=hojd})
>> context.sprint("bar")
>> end
>> end
>> \stopluacode
>>
>> \unexpanded\def\lundklippfyllbild#1#2#3{%
>> \startexternalfigurecollection[#1]%
>> \useexternalfigure[#1][#1]%
>> \stopexternalfigurecollection%
>> \clip[
>> width=#2,
>> height=#3,
>> hoffset=0mm,
>> voffset=0mm,
>> ]{%
>> \framed[width=#2,height=#3,align={middle,lohi},offset=overlay,frame=off]{%
>> \dimen0=\externalfigurecollectionminwidth{#1}%
>> \dimen2=\externalfigurecollectionmaxheight{#1}%
>> \dimen4=#2%
>> \dimen6=#3%
>> {\ctxlua{userdata.lundklippfyllbild([==[#1]==],[==[#2]==],[==[#3]==])}}}}}
>>
>>
>>
>> and then run
>>
>>
>> \lundklippfyllbild{k.jpg}{\textwidth}{\textheight}
>
> Here is an eTeX solution.
>
> \unprotect
>
> \newdimen\d_scaleandclip_actual_wd
> \newdimen\d_scaleandclip_actual_ht
>
> \newdimen\d_scaleandclip_requested_wd
> \newdimen\d_scaleandclip_requested_ht
>
> \newbox\scaleandclip_box
>
> \installnamespace{scaleandclip}
> \installcommandhandler \????scaleandclip {scaleandclip} \????scaleandclip
>
> \setupscaleandclip
> [width=\textwidth,
> height=\textheight]
>
> \unexpanded\def\scaleandclip{\dodoubleempty\doscaleandclip}
>
> \def\doscaleandclip[#1][#2]%
> {\bgroup
> \ifsecondargument
> \edef\currentscaleandclip{#1}%
> \setupcurrentscaleandclip[#2]%
> \else\iffirstargument
> \doifassignmentelse{#1}
> {\let\currentscaleandclip\empty
> \setupcurrentscaleandclip[#1]}
> {\edef\currentscaleandclip{#1}}
> \else
> \let\currentscaleandclip\empty
> \fi\fi
> \dowithnextboxcs\scaleandclip_finish\hbox}
>
> \def\scaleandclip_finish
> {%
> \d_scaleandclip_requested_wd \dimexpr\scaleandclipparameter\c!width\relax
> \d_scaleandclip_requested_ht
> \dimexpr\scaleandclipparameter\c!height\relax
> %
> \d_scaleandclip_actual_wd\wd\nextbox
> \d_scaleandclip_actual_ht\dimexpr\ht\nextbox + \dp\nextbox\relax
> %
> \ifdim\dimexpr\d_scaleandclip_actual_wd*100/\d_scaleandclip_requested_wd
> <
> \dimexpr\d_scaleandclip_actual_ht*100/\d_scaleandclip_requested_ht
> \relax
> \setbox\scaleandclip_box\hbox
> {\scale[\c!width=\d_scaleandclip_requested_wd]{\box\nextbox}}%
> \scratchdimen=\the\dimexpr(\ht\scaleandclip_box -
> \d_scaleandclip_requested_ht)/2\relax
> \clip
> [
> \c!voffset=\scratchdimen,
> \c!height=\d_scaleandclip_requested_ht,
> ]{\box\scaleandclip_box}%
> \else
> \setbox\scaleandclip_box\hbox
> {\scale[\c!height=\d_scaleandclip_requested_ht]{\box\nextbox}}%
> \scratchdimen=\the\dimexpr(\wd\scaleandclip_box -
> \d_scaleandclip_requested_wd)/2\relax
> \clip
> [
> \c!hoffset=\scratchdimen,
> \c!width=\d_scaleandclip_requested_wd,
> ]{\box\scaleandclip_box}%
> \fi
> \egroup}
>
> \protect
>
> The usage is:
>
> \scaleandclip[width=..., height=...]{ ... any box ...}
>
> simimlar to the usage of \scale macro.
We should convince Hans to add this functionality to the \scale macro with
“factor=clip”.
Wolfgang
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