A question related to "Advanced Wrapfig"

Question

this is my code snipped I am experimenting with:

\documentclass{article}
\usepackage{lipsum}
\usepackage{graphicx,wrapfig}
\begin{document}
% \parshape <num lines> <indent> <width> ...
\parshape 12 0pt \textwidth
0pt \dimexpr0.5\textwidth+4.0\baselineskip\relax
0pt \dimexpr0.5\textwidth+3.25\baselineskip\relax
0pt \dimexpr0.5\textwidth+1.75\baselineskip\relax
0pt \dimexpr0.5\textwidth+1\baselineskip\relax
0pt \dimexpr0.5\textwidth+2.0\baselineskip\relax
0pt \dimexpr0.5\textwidth+2.75\baselineskip\relax
0pt \dimexpr0.5\textwidth+3.5\baselineskip\relax
0pt \dimexpr0.5\textwidth+4.25\baselineskip\relax
0pt \dimexpr0.5\textwidth+5.0\baselineskip\relax
0pt \dimexpr0.5\textwidth+6.75\baselineskip\relax
0pt \textwidth
\noindent\lipsum[1]
\end{document}

The original code is from @Werner (Advanced Wrapfig) (all credits to him). I would like to "mirror" the shape of the text, i.e. the shape should be on the left-hand side, but I don't understand how to change the above code. Can anyone from the community help me please? Thanks in advance!

Answer 1

Syntax: \parshape <n> <indent line 1> <text width line 1> … <indent line n> <text width line n>

So to have a shape on the left, you have to replace 0pt by the expected text indent and the second value should than be \dimexpr \textwidth - <indent of this line>\relax.

Example:

\documentclass{article}
\usepackage{lipsum}
%\usepackage{graphicx,wrapfig}% Not needed for using `\parshape`
\begin{document}
% \parshape <num lines> <indent> <width> ...
\parshape 11
0pt \textwidth
1em \dimexpr\textwidth-1em\relax
2em \dimexpr\textwidth-2em\relax
3em \dimexpr\textwidth-3em\relax
4em \dimexpr\textwidth-4em\relax
5em \dimexpr\textwidth-5em\relax
4em \dimexpr\textwidth-4em\relax
3em \dimexpr\textwidth-3em\relax
2em \dimexpr\textwidth-2em\relax
1em \dimexpr\textwidth-1em\relax
0pt \textwidth
\noindent\lipsum[1]
\end{document} 

From LaTeX 2022-06-01 you can use \dimeval{…} instead of \dimexpr …\relax, and therefore a somehow more LaTeX like syntax:

\NeedsTeXFormat{LaTeX2e}[2022-06-01]
\documentclass{article}
\usepackage{lipsum}
\begin{document}
% \parshape <num lines> <indent> <width> ...
\parshape 11
0pt \textwidth
1em \dimeval{\textwidth-1em}
2em \dimeval{\textwidth-2em}
3em \dimeval{\textwidth-3em}
4em \dimeval{\textwidth-4em}
5em \dimeval{\textwidth-5em}
4em \dimeval{\textwidth-4em}
3em \dimeval{\textwidth-3em}
2em \dimeval{\textwidth-2em}
1em \dimeval{\textwidth-1em}
0pt \textwidth
\noindent\lipsum[1]
\end{document} 

See ltnews35 and LaTeX for authors — current version section 5 for more information about \dimeval.

Note: If the LaTeX run reports \dimeval as unknown command sequence with the example above, your LaTeX installation is too old. Either update or use the \dimexpr…\relax version instead.

BTW: The last pair is not only used for line n but all lines >= n in the paragraph, if the paragraph has more than n lines.

For more information about \dimexpr…\relax see The ε-TeX manual, section 3.5.