pm-isomath (1may21)

git-svn-id: svn://tug.org/texlive/trunk@59038 c570f23f-e606-0410-a88d-b1316a301751

1 files changed, 92 insertions, 15 deletions

diff --git a/Master/texmf-dist/source/latex/pm-isomath/pm-isomath.dtx b/Master/texmf-dist/source/latex/pm-isomath/pm-isomath.dtx
index 106ca10d1dd..dba0560e67f 100644
--- a/Master/texmf-dist/source/latex/pm-isomath/pm-isomath.dtx
+++ b/Master/texmf-dist/source/latex/pm-isomath/pm-isomath.dtx
@@ -57,7 +57,7 @@ This work consists of this file pm-isomath.dtx, a README.txt file
 %<style>\ProvidesPackage{pm-isomath}[%
 %<txt>\ProvidesFile{README.txt}[%
 %<*driver,style,txt>
-  2020/11/06 v.1.0.07 
+  2021/05/01 v.1.1.00 
 %<txt>  README file for pm-isomath.sty]
 %<style>Poor man package for typesetting ISO compliant math when using pdfLaTeX]
 %</driver,style,txt>
@@ -103,7 +103,7 @@ This work consists of this file pm-isomath.dtx, a README.txt file
 %</driver>
 % \fi
 %
-% \CheckSum{436}%
+% \CheckSum{459}%
 % \begin{abstract}
 % The ISO regulations for typesetting math in the field of physics
 % and technology are pretty stringent and imply legal questions
@@ -651,6 +651,30 @@ This work consists of this file pm-isomath.dtx, a README.txt file
 %\end{tabular}\end{lrbox}
 %\noindent\resizebox{\textwidth}{!}{\usebox{0}}\egroup
 %
+% \subparagraph{ISO upright partial differential}
+% Among the fonts used to typeset math when using \prog{pdflatex},
+% only the LibertinusT1math font contains the upright partial
+% differential symbol that conforms the ISO regulations. All other
+% fonts at the moment available to typeset mathematics do not
+% contain an upright symbol, but they contain the original slanted
+% symbol as used with the CM fonts. With a poor-man trick it is
+% possible ti have available an upright symbol so as to describe
+% the Electrical field as the opposite of the electric potential
+% gradient. Compare the following formulas, where the second one
+% is ISO compliant:
+%\begin{align}
+%E =-\nabla V = -\left(
+%\frac{\partial V}{\partial x}\MathLatin{e}[b](it)_x + 
+%\frac{\partial V}{\partial y}\MathLatin{e}[b](it)_y + 
+%\frac{\partial V}{\partial z}\MathLatin{e}[b](it)_z + 
+%\right)\\[\baselineskip]
+%E =-\nabla V = -\left(
+%\frac{\uppartial V}{\uppartial x}\MathLatin{e}[b](it)_x + 
+%\frac{\uppartial V}{\uppartial y}\MathLatin{e}[b](it)_y + 
+%\frac{\uppartial V}{\uppartial z}\MathLatin{e}[b](it)_z + 
+%\right)\\[\baselineskip]
+%\end{align}
+%
 %\section{Final remarks}
 % This package |pm-isomath| is far from perfect, and its results are
 % questionable; of course poor man solutions are just patches;
@@ -665,6 +689,7 @@ This work consists of this file pm-isomath.dtx, a README.txt file
 % by Günter Milde, but tackles the problem of insufficient maximum
 % number of math font groups so as to avoid any problem with such
 % group limitation, and therefore all the caveats in Milde's package.
+%
 % That package is much more comfortable to use than this one; but
 % it is subject to a number of conditions that, depending on the
 % user environment, may even result in a complete failure. This
@@ -694,18 +719,18 @@ This work consists of this file pm-isomath.dtx, a README.txt file
 %\iffalse
 %<*style>
 %\fi
-%    \begin{macrocode}
 % Then we verify if the document is being typeset with \pdfLaTeX;
 % if it is not, an error flag is raised and reading of this
 % package is immediately interrupted. For this purpose we need
 % an engine-detecting package, and we generally use the |iftex| one.
+%    \begin{macrocode}
 \@ifpackageloaded{iftex}{}{\RequirePackage{iftex}}
 \unless\ifPDFTeX
     \PackageError{pm-isomath}{%
        ******************************************\MessageBreak
        This package should be used only when     \MessageBreak
        typesetting with pdfLaTeX.                \MessageBreak
-       Skipping loading the package              \MessageBreak
+       Loading this package is skipped           \MessageBreak
        ******************************************\MessageBreak
     }{%
        ******************************************\MessageBreak
@@ -728,12 +753,13 @@ This work consists of this file pm-isomath.dtx, a README.txt file
 % option is for deciding if the imaginary unit should be
 % defined as ‘i’ or ‘j’. As we have remarked in the previous
 % documentation, engineers, especially those who deal with
-% electricity and electrical quantities, but also electronics, control
+% electricity and electrical quantities, but also electronics, control,
 % and telecommunications engineers, use ‘j’; all these
 % varieties of engineers could not do anything in their profession
 % if they don't use complex numbers and quantities (the latter
 % called phasors). Possibly they are the applied scientists
-% who use complex numbers more than any other scientist.
+% who use complex numbers more often than any other scientist.
+%
 % Note: this option has \emph{not} been used to prepare this
 % very document.
 %    \begin{macrocode}
@@ -741,11 +767,25 @@ This work consists of this file pm-isomath.dtx, a README.txt file
 \DeclareOption{engineer}{\engineertrue}
 \ProcessOptions*\relax
 %    \end{macrocode}
-% Are the necessary packages already loaded?
+% Are the necessary packages already loaded? Notice that in previous
+% versions we just loaded |xparse| unless it was already loaded;
+% since 2020 the main functionalities of this package are already
+% contained into the \LaTeX\ kernel, But we are going to use one
+% of those “deprecated” functionalities that did not make their way
+% to the \LaTeX\ kernel. We also use the |xfp| floating point
+% computations available with the \LaTeX3 language.
 %    \begin{macrocode}
 \@ifpackageloaded{amsmath}{}{\RequirePackage{amsmath}}
 \@ifpackageloaded{etoolbox}{}{\RequirePackage{etoolbox}}
-\@ifpackageloaded{xparse}{}{\RequirePackage{xparse}}
+\RequirePackage{xparse,xfp}
+%    \end{macrocode}
+%
+% Since a trick on the ISO compliant upright partial differential
+% symbol requires the functionalities of the |rotate| and |scale|
+% functionalities, we load also the |graphicx| package if it has not
+% been already loaded.
+%    \begin{macrocode}
+\@ifpackageloaded{graphicx}{}{\RequirePackage{graphicx}}
 %    \end{macrocode}
 % Now we have almost all software instruments available. We
 % define a macro to switch the definitions of certain math
@@ -860,7 +900,7 @@ This work consists of this file pm-isomath.dtx, a README.txt file
 % commands are constructed in such a way as to have a default
 % family, series and shape common to both Latin and Greek fonts;
 % therefore with three optional arguments that the user can
-% specify with different delimiters but respecting their order,
+% specify with different delimiters, but respecting their order,
 % the user can get eight different choice combinations that
 % allow the selection of a large number of different looks.
 %
@@ -869,9 +909,9 @@ This work consists of this file pm-isomath.dtx, a README.txt file
 % mostly differ in the encoding choice for Latin or Greek letters.
 %
 % The user macros are defined by means of the defining commands
-% provided by the |xparse| package, while the service macros use
-% normal \LaTeX\ commands. The user commands follow this special
-% syntax:
+% provided by the |xparse| package functionalities, while the service
+% macros use normal \LaTeX\ commands. The user commands follow this
+% special syntax:
 %\begin{ttsintassi}
 %\cs{MathLatin}\marg{Latin letter}\marg{family}\oarg{series}\parg{shape}
 %\cs{MathGreek}\marg{Greek letter}\marg{family}\oarg{series}\parg{shape}
@@ -968,9 +1008,9 @@ This work consists of this file pm-isomath.dtx, a README.txt file
 \csname M@OT1\endcsname{9}}
 %    \end{macrocode}
 % Imitating the |ISOmath| package we define also the macros
-% for selecting the bold italics (produces results similar
-% to those obtained with package |bm|, but it does not require
-% any math group), and sans serif in  both normal and bold
+% for selecting the bold italics math fonts (with results similar
+% to those obtained with package |bm|,without requiring
+% any math group), and sans serif in both normal and bold
 % slanted shape.
 %    \begin{macrocode}
 \AtBeginDocument{%
@@ -1030,6 +1070,34 @@ This work consists of this file pm-isomath.dtx, a README.txt file
 % the thin space |\,| is absolute and does not change depending
 % on the preceding math atom.
 %
+% The ISO regulations require that any letter-like symbol that
+% does not refer to a measurable quantity be set in upright shape;
+% we already applied the regulation to the regular differential
+% symbol, that may appear in both the derivative fractions and
+% in the differential integrators. With partial derivatives the
+% default symbol is slanted since the very beginning of \TeX, when the
+% OMS Computer Modern Symbol font was defined; according to the
+% ISO regulations such symbol should be upright. For use with
+% \pdfLaTeX the only font distributed with any \TeX system that
+% contains such an upright symbol is the LibertinusT1math one;
+% all other OMS encoded fonts do no contain it. The defined
+% command |\uppartial| name is identical to the one used by the
+% LibertinusT1math font; therefore it is easy to check if this
+% symbol has already been defined
+%
+% On \texttt{tex.stachexchange.com} some questions were asked on
+% how to produce a suitable upright partial differential symbol,
+% when fonts did not have one available. The solutions we found
+% there are based on rotating and scaling the available slanted
+% partial differential symbol. We follow a similar approach,
+% although a shearing process would be a better solution;
+% we avoid to redefine this symbol if it is already available.
+% The default counterclockwise rotation is fixed to 22°, but may
+% be changed by means of an optional argument. Of course this
+% solution is a patch; we tested it at several sizes but only
+% with the Latin Modern Type~1 fonts. May be with other fonts
+% the results might need some adjustments.
+%
 % The command |\unit| for appending the units of measure to
 % the numerical value of the measure is added if no packages
 % have already defined it; package |siunitx| is a particularly
@@ -1068,6 +1136,15 @@ This work consists of this file pm-isomath.dtx, a README.txt file
 \providecommand*\diff{}
 \renewcommand*\diff{\ensuremath{\mathop{}\!\MathLatin{d}(n)}}
 % 
+\newbox{\PMpartial}
+\AtBeginDocument{%
+\@ifdefinable{\uppartial}%
+  {\NewDocumentCommand\uppartial{O{22}}{\setbox\PMpartial\hbox{$\partial$}%
+  \setbox\PMpartial=\hbox{%
+    \scalebox{1}[\fpeval{cosd #1}]{\rotatebox[origin=br]{#1}{\box\PMpartial}}%
+  }\raisebox{0.35ex}{\box\PMpartial}\mkern-1.25mu}}%
+}
+%
 \providecommand*\micro{}
 \AtBeginDocument{\@ifpackageloaded{textcomp}%
   {\renewcommand*\micro{\textormath{\textmu}{\ISOmu(rs)}}}%