Am 2017-09-09 um 22:06 schrieb Aditya Mahajan :

On Sat, 9 Sep 2017, Henning Hraban Ramm wrote:

...

Ahoi, I got some long images that I’d like to split over several pages.

\def\clipfigure{\dodoubleempty\doClipFigure} \def\doClipFigure[#1][#2]{ \dorecurse{#1}{% \clip[ height=\textheight, voffset=\dimexpr((\recurselevel -1) * \textheight) ]{\externalfigure[#2][width=\textwidth]}\par } }

\clipfigure[3][verylongimage]

But "\dimexpr((\recurselevel -1) * \textheight)" for the vertical offset is wrong. How can I do this calculation?

You are missing a comma at the end of the voffset line

Thank you, but that’s not the core problem. I get "Illegal unit of measure (pt inserted)". My current code actually looks like % split in #1 page size parts \def\clipfigure{\dodoubleempty\doClipFigure} \def\doClipFigure[#1][#2]{ \ifsecondargument \dorecurse{#1}{% \tooltip{\clip[ height=\textheight, voffset=\dimexpr((\recurselevel - 1)\textheight),]{% \externalfigure[#2]}}{#2 (\recurselevel/#1)}\par} \else \normalfigure[#1] \fi } Another approach: \def\ausschnitt{\dodoubleempty\doAusschnitt} \def\doAusschnitt#1#2{\clip[height=\textheight,voffset=#1]{\externalfigure[#2][width=\textwidth]}\par} This also doesn’t work; there I’m trying to set the y coordinate for the start like \ausschnitt[15cm][verylongimage] Here I get "Missing number, treated as zero". I guess I need to employ the right combination of \the, expansion etc., but I don’t know how. This stuff is still over my head.

but why not use \clip[nx= .., ny=.., x=, y=...] instead. http://wiki.contextgarden.net/Using_Graphics#Image_Clipping

Because I don’t want to split the picture in even slices, but cut in places where it makes sense. The page height is a simplification, until I get the calculations working. BTW example picture: http://www.balderdashcomic.com/comic/ibonus i.e. http://www.balderdashcomic.com/comics/1416175460-bonus1.png Greetlings, Hraban --- http://www.fiee.net http://wiki.contextgarden.net GPG Key ID 1C9B22FD

Am 10.09.2017 um 09:13 schrieb Henning Hraban Ramm:

My current code actually looks like

% split in #1 page size parts \def\clipfigure{\dodoubleempty\doClipFigure} \def\doClipFigure[#1][#2]{ \ifsecondargument \dorecurse{#1}{% \tooltip{\clip[ height=\textheight, voffset=\dimexpr((\recurselevel - 1)\textheight),]{%

voffset=\numexpr(\recurselevel -1)\textheight]{% Herbert

\externalfigure[#2]}}{#2 (\recurselevel/#1)}\par} \else \normalfigure[#1] \fi }