Hi Mikael, Out of curiosity I tried to typeset your example (after adding the usual \starttext, \stoptext), but using ConTeXt ver: 2014.04.28 23:24 MKIV beta fmt: 2014.4.29 int: english/english I obtained a TeX error: tex error > error on line 13 in file /Users/kavian/Context/essais/mkii/figures/resize-and-center.tex: ! Undefined control sequence \startexternalfigurecollection ...igurecollection {#1}\settrue \c_grph_inclu... l.13 \clip[width=8cm,height=7cm] {% 3 \startexternalfigurecollection[k.jpg] 4 \useexternalfigure[k.jpg][k.jpg] 5 \stopexternalfigurecollection I did not understand what is the « Undefined control sequence », since I think \clip is a known control sequence. Best regards: OK On 1 mai 2014, at 15:38, Mikael P. Sundqvist wrote:

OK, sorry for the noise. I think I have the solution:

\startexternalfigurecollection[k.jpg] \useexternalfigure[k.jpg][k.jpg] \stopexternalfigurecollection

\externalfigurecollectionminwidth{k.jpg} \externalfigurecollectionmaxheight{k.jpg}

\clip[width=8cm,height=7cm]{% \framed[width=8cm,height=7cm,align={middle,lohi},offset=overlay]{% \dimen0=\externalfigurecollectionminwidth{k.jpg} \dimen2=\externalfigurecollectionmaxheight{k.jpg} \dimen4=8cm \dimen6=7cm \startluacode 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({"k.jpg"},{width="8cm"}) 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({"k.jpg"},{height="7cm"}) context.sprint("bar") end \stopluacode }}

If there are any bad side effects of this or simplifications, please do not hesitate to tell me :)

/Mikael

On Thu, May 1, 2014 at 1:50 PM, Mikael P. Sundqvist wrote:

...

Hi!

Assume that I want to fill in the text area with images, and I want to clip and scale them according to these rules:

1) If the image is "too wide" (in sense of proportions), then scale it so that the height fits the text area height, center it, and clip it to the text area. (See the attached image, on top, where the blue area is supposed to show the text area and the red rectangle the image.)

2) If the image is "too high" (in sense of proportions), then scale it so that the width fits the text area width, center it, and clip it to the text area. (See the attached image, on bottom.)

The background why I want to do this is that I'm making a small template for presentations, and I'd like the users to insert images as background without really having to think about if their proportions fit or not.

Best regards, Mikael

---

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maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : http://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___________________________________________________________________________________

Hi Mikael, With your new definitions and lua code I could typeset and test a few examples: it is very nice, thanks for sharing! Best regards: OK On 1 mai 2014, at 17:07, Mikael P. Sundqvist wrote:

Interesting,

I use ConTeXt ver: 2014.04.28 23:24 MKIV beta fmt: 2014.4.29 int: english/english

and it works. I now defined this with argument:

\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}

it works well. Of course you should replace k.jpg with some other image name...

/Mikael

PS And please, if someone has opinions about the code, don't hesitate to tell me. This is my first time using lua...

On Thu, May 1, 2014 at 4:59 PM, Otared Kavian wrote:

...

Hi Mikael,

Out of curiosity I tried to typeset your example (after adding the usual \starttext, \stoptext), but using ConTeXt ver: 2014.04.28 23:24 MKIV beta fmt: 2014.4.29 int: english/english I obtained a TeX error:

tex error > error on line 13 in file /Users/kavian/Context/essais/mkii/figures/resize-and-center.tex: ! Undefined control sequence

\startexternalfigurecollection ...igurecollection {#1}\settrue \c_grph_inclu... l.13 \clip[width=8cm,height=7cm] {%

3 \startexternalfigurecollection[k.jpg] 4 \useexternalfigure[k.jpg][k.jpg] 5 \stopexternalfigurecollection

I did not understand what is the « Undefined control sequence », since I think \clip is a known control sequence.

Best regards: OK

On 1 mai 2014, at 15:38, Mikael P. Sundqvist wrote:

...

OK, sorry for the noise. I think I have the solution:

\startexternalfigurecollection[k.jpg] \useexternalfigure[k.jpg][k.jpg] \stopexternalfigurecollection

\externalfigurecollectionminwidth{k.jpg} \externalfigurecollectionmaxheight{k.jpg}

\clip[width=8cm,height=7cm]{% \framed[width=8cm,height=7cm,align={middle,lohi},offset=overlay]{% \dimen0=\externalfigurecollectionminwidth{k.jpg} \dimen2=\externalfigurecollectionmaxheight{k.jpg} \dimen4=8cm \dimen6=7cm \startluacode 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({"k.jpg"},{width="8cm"}) 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({"k.jpg"},{height="7cm"}) context.sprint("bar") end \stopluacode }}

If there are any bad side effects of this or simplifications, please do not hesitate to tell me :)

/Mikael

On Thu, May 1, 2014 at 1:50 PM, Mikael P. Sundqvist wrote:

...

Hi!

Assume that I want to fill in the text area with images, and I want to clip and scale them according to these rules:

1) If the image is "too wide" (in sense of proportions), then scale it so that the height fits the text area height, center it, and clip it to the text area. (See the attached image, on top, where the blue area is supposed to show the text area and the red rectangle the image.)

2) If the image is "too high" (in sense of proportions), then scale it so that the width fits the text area width, center it, and clip it to the text area. (See the attached image, on bottom.)

The background why I want to do this is that I'm making a small template for presentations, and I'd like the users to insert images as background without really having to think about if their proportions fit or not.

Best regards, Mikael

---

If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : http://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___________________________________________________________________________________

___________________________________________________________________________________ If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : http://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___________________________________________________________________________________

---

If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : http://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___________________________________________________________________________________

On Thu, May 1, 2014 at 8:00 PM, Aditya Mahajan wrote:

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

___________________________________________________________________________________ If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : http://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___________________________________________________________________________________

Thanks Aditya! That is more general and looks more ConTeXt-ish to me with the options. I should study your code in detail to learn how that is done. Mikael