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I need to (temporarly) redefine \includegraphics command for trimming purposes. This is my MWE:

\documentclass[11pt]{article}
\usepackage{graphicx}
\usepackage[abs]{overpic}
\pagestyle{empty}
\begin{document}
\begin{figure}[h]
\centering
\resizebox*{1\textwidth}{!}{\begin{overpic}[grid,unit=1pt]{lemon.jpg}
\end{overpic}}\relax

\includegraphics[trim = 0 100 0 100, clip, width=1\textwidth]{lemon.jpg}
\caption{\label{myfig}My caption.}
\end{figure}

\end{document}

enter image description here

In this example I have a picture inserted with the overpic environment that create a grid on my figure. This allow my to find, quickly, the values to pass to the trim parameter of the \includegraphics command.

To make this operation much less "overkill" I tried to redefine the \includegraphics command this way:

\renewcommand*{\includegraphics}[2][]{\resizebox*{1\textwidth}{!}{%
\begin{overpic}[grid,unit=1pt]{#2}\end{overpic}}\relax}

but it doesn't work. I get this error:

! TeX capacity exceeded, sorry [grouping levels=255]....

I know you may find it yet "overkill" but I have my goog reasons to do that.(This would allow me to pass this redefinition by command line, keeping my .tex untouched)

My answer(s) is "how can I redefine the \includegraphics command to insert this sort of grid in my figures? What's wrong in my code?"

I took the idea from this post: https://latex.org/forum/viewtopic.php?t=7783

Edit. I can't understand why if i define this command(s)

\newcommand{\vacua}[1]{}
\newcommand*{\myincludegraphics}[2][]{\resizebox*{1\textwidth}{!}{%
\begin{overpic}[grid,unit=1pt]{#2}\end{overpic}}\relax\vacua{#1}}

the string:

\myincludegraphics[trim = 0 100 0 100, clip, width=1\textwidth]{lemon.jpg}

generates my picture with the grid correctly. But if i do:

\newcommand{\myignore}[1]{}
\let\includegraphics\undefined %% I undefine "\includegraphics"
\newcommand*{includegraphics}[2][]{\resizebox*{1\textwidth}{!}{%
\begin{overpic}[grid,unit=1pt]{#2}\end{overpic}}\relax\myignore{#1}}

with the string:

\includegraphics[trim = 0 100 0 100, clip, width=1\textwidth]{lemon.jpg}

I keek getting the same error.

Gabriele
  • 1,815
  • 2
    Circular definition, overpic uses includegraphics internally. You're better of making a personal macro and then replacing it when you are done trimming. – daleif Oct 14 '18 at 16:49
  • Again circular definition. Overpic uses includegraphics internally, so you get includegrapgics, calling overpic, calling includegrapgics, calling overpic.... – daleif Oct 14 '18 at 17:13
  • Your myincludegraphics is a bit strange. Why are you throwing away the optional argument (#1). Instead of passing it on to overpic? – daleif Oct 14 '18 at 17:15
  • There is another possibility with tikz: https://tex.stackexchange.com/q/9559/138900 – AndréC Oct 14 '18 at 17:35
  • @daleif If I pass it to overpic I'll get wrong values... look at https://latex.org/forum/viewtopic.php?t=7783 – Gabriele Oct 14 '18 at 17:51
  • Did you remember to use [grid,unit=1pt,#1], not i do not remember if overpic passes args onto includegraphics like this, it should be in the manual. Not at pc so cannot help. – daleif Oct 14 '18 at 17:57

1 Answers1

0

To avoid the circular definition (as pointed by daleif) I solved using this trick:

  1. I replace "\includegraphics" with "\myincludegraphics" in my .tex (easy to do with emacs)

  2. I compile with these options:

    pdflatex '\AtBeginDocument{\RequirePackage[abs]{overpic}\newcommand{\myignore}\[1]{} \newcommand*{\myincludegraphics}\[2][]{\resizebox*{1\textwidth}{!}{\begin{overpic}[grid,unit=1pt]{#2}\end{overpic}}\relax\myignore{#1}}} \nonstopmode\input{myfile.tex}'

    Now I get a grid on all the picture inserted with the \includegraphics command and I can use the trim parameter to tune the layout having a visible estimation of the trimming values (expressed in pt).

  3. I restore the \includegraphics string in my .tex file.

The \resizebox stuff helps me to obtain a temporarly enlarged layout of the figures...

The \myignore trick is required to obtain a real estimation of the trimming values (see https://latex.org/forum/viewtopic.php?t=7783)

I wrote a short elisp function that does all these operations (points 1-3) in one shot (I love emacs).

Gabriele
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