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% Copyright 2007 Mark Wibrow
%
% but subject to the LaTeX Project Public License
% (http://www.latex-project.org/lppl.txt)
%
% and the GNU Public License
% (http://www.gnu.org/licenses/gpl.txt)
%
% This file defines utilities common to the \pgfmath files.
%
% Version 1.414213 29/9/2007
\def\pgfmathincluded{}
% \pgfmath@ensureregister
%
% Ensure a control sequence exists as a TeX count/dimen register.
%
% #1 - count or dimen.
% #2 - a control sequence.
%
\def\pgfmath@ensureregister#1#2{%
\begingroup%
\setbox0=\hbox\bgroup\begingroup% In case #2 is a defined macro. Unlikely, but you never know...
\afterassignment\pgfmath@@ensureregister%
\noexpand#20.0pt\let\pgfmath@temp\relax\relax\pgfmath@#2#1\pgfmath@}
\def\pgfmath@@ensureregister#1#2\pgfmath@#3#4#5\pgfmath@{%
\endgroup\egroup%
\endgroup%
\ifx#4c%
\ifx#1.% Already a count register.
\else%
\csname newcount\endcsname#3% This gets round \outer in plain TeX.
\fi%
\else%
\ifx#4d%
\ifx\let#1% Already a dimen register.
\else%
\csname newdimen\endcsname#3%
\fi%
\fi%
\fi%
}
% Check registers exist. If not, create them.
%
\pgfmath@ensureregister{dimen}{\pgf@x}
\pgfmath@ensureregister{dimen}{\pgf@xa}
\pgfmath@ensureregister{dimen}{\pgf@xb}
\pgfmath@ensureregister{dimen}{\pgf@xc}
\pgfmath@ensureregister{dimen}{\pgf@y}
\pgfmath@ensureregister{dimen}{\pgf@ya}
\pgfmath@ensureregister{dimen}{\pgf@yb}
\pgfmath@ensureregister{dimen}{\pgf@yc}
\pgfmath@ensureregister{dimen}{\pgfutil@tempdima}
\pgfmath@ensureregister{dimen}{\pgfutil@tempdimb}
\pgfmath@ensureregister{count}{\c@pgf@counta}
\pgfmath@ensureregister{count}{\c@pgf@countb}
\pgfmath@ensureregister{count}{\c@pgf@countc}
\pgfmath@ensureregister{count}{\c@pgf@countd}
\pgfmath@ensureregister{count}{\pgfutil@tempcnta}
\pgfmath@ensureregister{count}{\pgfutil@tempcntb}
% Alias for \pgfmath.
%
\let\pgfmath@x\pgf@x
\let\pgfmath@xa\pgf@xa
\let\pgfmath@xb\pgf@xb
\let\pgfmath@xc\pgf@xc
\let\pgfmath@y\pgf@y
\let\pgfmath@ya\pgf@ya
\let\pgfmath@yb\pgf@yb
\let\pgfmath@yc\pgf@yc
\let\pgfmath@tempdima\pgfutil@tempdima
\let\pgfmath@tempdimb\pgfutil@tempdimb
\let\c@pgfmath@counta\c@pgf@counta
\let\c@pgfmath@countb\c@pgf@countb
\let\c@pgfmath@countc\c@pgf@countc
\let\c@pgfmath@countd\c@pgf@countd
\let\pgfmath@tempcnta\pgfutil@tempcnta
\let\pgfmath@tempcntb\pgfutil@tempcntb
% Now check if pgfutil and pgf@sys stuff exists. If it does, fine.
% Just \let pgfmath versions. If not, define pgfmath versions (Arghhh).
%
% \...ifnextchar
%
\ifx\pgfutil@ifnextchar\pgfmath@undefined%
\long\def\pgfmath@ifnextchar#1#2#3{%
\let\pgfmath@reserved@d#1%
\def\pgfmath@reserved@a{#2}%
\def\pgfmath@reserved@b{#3}%
\futurelet\pgfmath@let@token\pgfmath@ifnch}
\def\pgfmath@ifnch{%
\ifx\pgfmath@let@token\pgfmath@sptoken%
\let\pgfmath@reserved@c\pgfmath@xifnch%
\else%
\ifx\pgfmath@let@token\pgfmath@reserved@d%
\let\pgfmath@reserved@c\pgfmath@reserved@a%
\else%
\let\pgfmath@reserved@c\pgfmath@reserved@b%
\fi%
\fi%
\pgfmath@reserved@c}
{%
\def\:{\global\let\pgfmath@sptoken= } \:
\def\:{\pgfmath@xifnch} \expandafter\gdef\: {\futurelet\pgfmath@let@token\pgfmath@ifnch}
}%
\else%
\let\pgfmath@ifnextchar\pgfutil@ifnextchar%
% Still need to define \pgfmath@sptoken (cannot \let).
{%
\def\:{\global\let\pgfmath@sptoken= } \:
}%
\fi%
% \...ifundefined
%
\ifx\pgfutil@ifundefined\pgfmath@undefined%
\long\def\pgfmath@ifundefined#1{%
\expandafter\ifx\csname#1\endcsname\relax%
\expandafter\pgfmath@firstoftwo%
\else%
\expandafter\pgfmath@secondoftwo%
\fi}%
\else%
\let\pgfmath@ifundefined\pgfutil@ifundefined%
\fi%
% \...selectfont
%
\ifx\pgfutil@selectfont\pgfmath@undefined%
\ifx\selectfont\pgfmath@undefined%
\let\pgfmath@selectfont\rm% Plain TeX and ConTeXt.
\else%
\let\pgfmath@selectfont\selectfont% LaTeX.
\fi%
\else%
\let\pgfmath@selectfont\pgfutil@selectfont%
\fi%
% New definition easier than fussing around with let.
%
\newif\ifpgfmath@in@
\def\pgfmath@in@#1#2{%
\def\pgfmath@in@@##1#1##2##3\pgfmath@in@@{%
\ifx\pgfmath@in@##2\pgfmath@in@false\else\pgfmath@in@true\fi}%
\pgfmath@in@@#2#1\pgfmath@in@\pgfmath@in@@}
% \...tonumber
%
\ifx\pgf@sys@tonumber\pgfmath@undefined%
{\catcode`\p=12\catcode`\t=12\gdef\Pgf@geT#1pt{#1}}
\def\pgfmath@tonumber#1{\expandafter\Pgf@geT\the#1}
\else%
\let\pgfmath@tonumber\pgf@sys@tonumber%
\fi%
% \PackageWarning and \PackageError
%
\ifx\PackageWarning\pgfmath@undefined
\def\pgfmath@PackageWarning#1#2{\immediate\write-1{Package #1: Warning! #2.}}%
\else%
\let\pgfmath@PackageWarning\PackageWarning%
\fi%
\ifx\PackageError\pgfmath@undefined
\def\pgfmath@PackageError#1#2#3{\errmessage{Package #1 Error: #2.}}%
\else%
\let\pgfmath@PackageError\PackageError%
\fi%
\def\pgfmath@error#1#2{%
\pgfmath@PackageError{PGF Math}{%
#1%
\pgfutil@ifundefined{pgfmath@expression}{}{ (in '\pgfmath@expression')}%
}{#2}%
}
\def\pgfmath@warning#1{%
\pgfmath@PackageWarning{PGF Math}{%
#1%
\pgfutil@ifundefined{pgfmath@expression}{}{ (in '\pgfmath@expression')}%
}%
}
% \pgfmath@pt
%
% Needed to test for 'pt' resulting from expansion using \the.
%
{\catcode`\p=12\catcode`\t=12\gdef\PgfmaTh@PT{pt}}
\edef\pgfmath@pt{\PgfmaTh@PT}%
% \pgfmath@empty
%
% A handy macro.
%
\def\pgfmath@empty{}
\def\pgfmath@firstoftwo#1#2{#1}
\def\pgfmath@secondoftwo#1#2{#2}
% \pgfmath@gobbletilpgfmath@
%
% Gobble stream until \pgfmath@ {which is undefined}.
%
\def\pgfmath@gobbletilpgfmath@#1\pgfmath@{}
\def\pgfmath@gobbleone#1{}%
\def\pgfmath@namedef#1{\expandafter\def\csname#1\endcsname}
\def\pgfmath@nameedef#1{\expandafter\edef\csname#1\endcsname}
% \pgfmathloop
%
% A version of the standard TeX and LaTeX
% \loop, with an additional macro \pgfmathcounter
% (which is *not* a TeX counter) which keeps
% track of the iterations.
%
\newif\ifpgfmathcontinueloop
\def\pgfmathloop#1\repeatpgfmathloop{%
\def\pgfmathcounter{1}%
\def\pgfmath@iterate{%
#1\relax%
{% Do this inside a group, just in case...
\c@pgfmath@counta\pgfmathcounter%
\advance\c@pgfmath@counta1\relax%
\xdef\pgfmathloop@temp{\the\c@pgfmath@counta}%
}%
\edef\pgfmathcounter{\pgfmathloop@temp}%
\expandafter\pgfmath@iterate\fi}%
\pgfmath@iterate\let\pgfmath@iterate\relax}
\let\repeatpgfmathloop\fi
\def\pgfmathbreakloop{\let\pgfmath@iterate\relax}%
% \pgfmath@returnone
%
% #1 - a dimension representing a number or dimension.
%
% Changed by TT: made faster and simpler since it is used
% *heavily*. #1 must be something that can be assigned to a
% dimension.
%
\def\pgfmath@returnone#1\endgroup{%
\pgfmath@x#1%
\edef\pgfmath@temp{\pgfmath@tonumber{\pgfmath@x}}%
\expandafter\endgroup\expandafter\def\expandafter\pgfmathresult\expandafter{\pgfmath@temp}%
}
\let\pgfmathreturn=\pgfmath@returnone
% \pgfmath@smuggleone
%
% Smuggle a macro outside a group.
%
% Changed by TT: Speedup by insisting, that smuggleone is directly
% followed by \endgroup
%
\def\pgfmath@smuggleone#1\endgroup{%
\expandafter\endgroup\expandafter\def\expandafter#1\expandafter{#1}}
\let\pgfmathsmuggle=\pgfmath@smuggleone
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