From: Aditya Mahajan <adityam@umich.edu>
To: mailing list for ConTeXt users <ntg-context@ntg.nl>
Subject: Re: resize and center and clip image
Date: Thu, 1 May 2014 14:00:25 -0400 (EDT) [thread overview]
Message-ID: <alpine.DEB.2.02.1405011353370.7265@nqv-guvaxcnq> (raw)
In-Reply-To: <CAHy-LL-B0L3aF3H0-E=Hofbyjj6LoDEEAwJsWqU5XkGhrtizMg@mail.gmail.com>
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.
\starttext
\dontleavehmode
\scaleandclip[width=3cm, height=3cm]{\externalfigure[cow.pdf][width=3cm,frame=on]}
\scale[maxwidth=3cm, maxheight=3cm]{\externalfigure[cow.pdf][width=3cm,frame=on]}
\dontleavehmode
\scaleandclip[width=3cm, height=3cm]{\externalfigure[cow.pdf][width=3cm,height=10cm,frame=on]}
\scale[maxwidth=3cm, maxheight=3cm]{\externalfigure[cow.pdf][width=3cm,height=10cm,frame=on]}
\dontleavehmode
\scaleandclip[width=3cm, height=3cm]{\externalfigure[cow.pdf][width=10cm,height=3cm,frame=on]}
\scale[maxwidth=3cm, maxheight=3cm]{\externalfigure[cow.pdf][width=10cm,height=3cm,frame=on]}
\stoptext
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next prev parent reply other threads:[~2014-05-01 18:00 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-05-01 11:50 Mikael P. Sundqvist
2014-05-01 13:38 ` Mikael P. Sundqvist
2014-05-01 14:59 ` Otared Kavian
2014-05-01 15:07 ` Mikael P. Sundqvist
2014-05-01 16:43 ` Otared Kavian
2014-05-01 18:00 ` Aditya Mahajan [this message]
2014-05-01 19:27 ` Mikael P. Sundqvist
2014-05-01 19:31 ` Wolfgang Schuster
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