On Thu, 16 Mar 2023 18:27:53 +0100 Wolfgang Schuster via ntg-context wrote:

Keith McKay via ntg-context schrieb am 16.03.2023 um 17:59:

...

Hi,

I would like to position a combination of images where the centre of the combination coincides with the centre of the text area of a page. In the example below I have made the combination into a layer thinking that this would be the easiest way to position it where I wanted. However to position in the centre of the page I would need to know the size of the combination and use this to calculate the x and y values for positioning of the layer. I have looked at the Wiki page on image size of combinations but still cant figure out how to do it. Any suggestions on how to go about this or is their a better way?

Wiki Page reference: https://wiki.contextgarden.net/Combinations#Image_Width

Thanks

Keith McKay

%%% example %%%

\setuppapersize[A4,portrait]%[A4,portrait]

\setuplayout

[backspace=2.5cm,

topspace=1cm,

height=28cm,

width=17cm,

header=0cm,

footer=0.75cm,

]

\useMPlibrary [dum]

\starttext

\definelayer[test3]

\setlayer[test3][x=2cm,y=15cm]

{\startcombination[nx=3,ny=1,distance=15mm,after=,location=middle]

{\externalfigure[dummy]}{}

\rotate[rotation=90]{\externalfigure[dummy]}{}

{\externalfigure[dummy][]}{}

\stopcombination}

\flushlayer[test3]

\stoptext

\useMPlibrary [dum]

\showframe [text] [text]

\setuplayout [tight]

\starttext

\centerbox    {\bTABLE[frame=off,offset=7.5mm,align={middle,lohi}]         \bTR             \bTD                 \externalfigure[dummy]             \eTD             \bTD                 \rotate[rotation=90]{\externalfigure[dummy]}             \eTD             \bTD                 \externalfigure[dummy]             \eTD         \eTR     \eTABLE}

\stoptext

Wolfgang

Or you could put the combination in a frame: \startparagraph [align=middle] \startframed [frame=off,offset=\zeropoint] \startcombination [nx=3,ny=1] {first} {} {second}{} {third} {} \stopcombination \stopframed \stopparagraph Alan

Hi, I've experimented this morning with the solutions suggested by Wolfgang and Alan in reply to my post. The solution is really quite simple as suggested by Wolfgang i.e. \centerbox{..}.  I have applied this to the code and I now have three different solutions to my initial problem. The Joy of ConTeXt! Thanks again Wolfgang and Alan. Best Wishes Keith McKay Here is the code showing the three solutions which others may find useful. \setuppapersize[A4,portrait]%[A4,portrait] \setuplayout [backspace=2.5cm, topspace=1cm, height=28cm, width=17cm, header=0cm, footer=0.75cm, ] \setuppagenumbering[state=start,alternative=doublesided,location=margin] \useMPlibrary [dum] \starttext %%% Me %%% \showframe [text] [text] \definelayer[test3] \setlayer[test3][] \centerbox{ {\startcombination[nx=3,ny=1,distance=15mm,after=,location=middle] {\externalfigure[dummy]}{} \rotate[rotation=90]{\externalfigure[dummy]}{} {\externalfigure[dummy][]}{} \stopcombination} } \flushlayer[test3] \page %%% Wolfgang %%% \centerbox {\bTABLE[frame=off,offset=7.5mm,align={middle,lohi}] \bTR \bTD \externalfigure[dummy] \eTD \bTD \rotate[rotation=90]{\externalfigure[dummy]} \eTD \bTD \externalfigure[dummy] \eTD \eTR \eTABLE} \page %%% Alan %%% \centerbox{ \startparagraph [align=middle] \startframed [frame=off,offset=\zeropoint] \startcombination [nx=3,ny=1,distance=15mm,after=,location=middle] {\externalfigure[dummy]}{} \rotate[rotation=90]{\externalfigure[dummy]}{} {\externalfigure[dummy][]}{} \stopcombination \stopframed \stopparagraph } \stoptext On 16/03/2023 19:50, Keith McKay wrote:

Thanks Wolfgang and Alan! I will experiment with them tomorrow. Best Wishes Keith McKay

Thanks for your reply Pablo. I didn't see it till just now because for some reason it ended up in my junk folder, along with a number of other ConTeXt messages. You will probably have seen my reply to the list with the three solutions, now we have four! Yep, I know that A4 is the default page size and I always start with that but sometimes I play about with page sizes when typesetting and so can just change when coding. In the document I'm working on, some pages will only contain images and/or combination of images so I went down the Layers route since this also allows me to absolutely position these images on the page. Thanks again for your help! Best Wishes Keith McKay On 16/03/2023 17:58, Pablo Rodriguez via ntg-context wrote:

On 3/16/23 17:59, Keith McKay via ntg-context wrote:

...

Hi,

I would like to position a combination of images where the centre of the combination coincides with the centre of the text area of a page. Hi Keith,

I think the following sample might achieve what you want:

\showframe \setupexternalfigures[location={default}] \setuplayout [backspace=2.5cm, topspace=1cm, height=28cm, width=17cm, header=0cm, footer=0.75cm, ] \definelayer[test3] %[x=.5\paperwidth, y=.5\paperheight] [x=.5\textwidth, y=.5\textheight] %\setupbackgrounds[page] \setupbackgrounds[text] [background=test3] \starttext \setlayer[test3][location={middle}] \framed[offset=overlay]{{\startcombination[nx=3,ny=1,distance=15mm] {\externalfigure[cow][width=15mm]}{} \rotate[rotation=90]{\externalfigure[cow][width=15mm]}{} {\externalfigure[cow][width=15mm]}{} \stopcombination}} \null \stoptext

BTW, A4 portrait is the default page size.

\setupbackgrounds is the standard way to place layers.

Page and text centering would require different positions (I have commented out the option for page centering).

I hope it helps (since I’m not sure I’m getting your point here),

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

maillist : ntg-context@ntg.nl / https://www.ntg.nl/mailman/listinfo/ntg-context webpage : https://www.pragma-ade.nl / http://context.aanhet.net archive : https://bitbucket.org/phg/context-mirror/commits/ wiki : https://contextgarden.net ___________________________________________________________________________________