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LogCreative avatar LogCreative commented on May 27, 2024 1

这个命令是为了实现 SJTU VI A5-03-01，主要代码是：

SJTUBeamer/src/source/sjtuvi.dtx

Lines 567 to 686 in 62e901b

% \begin{macro}{\sjtubeamer@compatible}
% For \TeX Live 2018 and even older,
% it is \emph{not} compatible to use the
% patterns.meta library for making
% user-defined patterns.
% And fading is not available for caching.
% Please consider
% \verb"\def\sjtubeamer@compatible{false}"
% to match the following condition
% checking.
%
% Remember to use \verb"\makeatletter"
% and \verb"\makeatother" in \LaTeX{}.
% \begin{macrocode}
\def\sjtubeamer@compatible@false{false}
% \end{macrocode}
% We didn't make it as an option since it will break the hierarchical structure of
% option definition. This is the bottom level of all style files, no advanced
% methods are provided in this layer.
% \end{macro}
%
% \begin{macro}{stamp}
% Make a stamp array.
%
% Use option
% \verb"[pattern={stamp[size=8pt,xshift=4pt,yshift=4pt]}]"
% on TikZ fill element.
% \begin{macrocode}
\ifx\sjtubeamer@compatible\sjtubeamer@compatible@false
\else
\usetikzlibrary{patterns.meta}
\tikzdeclarepattern{
name=stamp,
parameters={
\pgfkeysvalueof{/pgf/pattern keys/size},
\pgfkeysvalueof{/pgf/pattern keys/xshift},
\pgfkeysvalueof{/pgf/pattern keys/yshift},
},
defaults={
size/.initial = 5pt,
xshift/.initial = 0pt,
yshift/.initial = 0pt,
},
bottom left={(
-0.5*\pgfkeysvalueof{/pgf/pattern keys/size}
+\pgfkeysvalueof{/pgf/pattern keys/xshift},
-0.4*\pgfkeysvalueof{/pgf/pattern keys/size}
+\pgfkeysvalueof{/pgf/pattern keys/yshift}
)},
top right={(
0.5*\pgfkeysvalueof{/pgf/pattern keys/size}
+\pgfkeysvalueof{/pgf/pattern keys/xshift},
0.4*\pgfkeysvalueof{/pgf/pattern keys/size}
+\pgfkeysvalueof{/pgf/pattern keys/yshift}
)},
tile size={(
\pgfkeysvalueof{/pgf/pattern keys/size},
0.8*\pgfkeysvalueof{/pgf/pattern keys/size}
)},
code={
\def\sjtubeamer@s{\pgfkeysvalueof{/pgf/pattern keys/size}}%
\tikzset{x=0.5*\sjtubeamer@s,y=0.2*\sjtubeamer@s}
\fill[xshift=\pgfkeysvalueof{/pgf/pattern keys/xshift},
yshift=\pgfkeysvalueof{/pgf/pattern keys/yshift}]
(-0.25*\sjtubeamer@s,0)
-- (-0.17*\sjtubeamer@s,0.06*\sjtubeamer@s)
-- (-0.17*\sjtubeamer@s,0.1*\sjtubeamer@s)
-- (0.17*\sjtubeamer@s,0.1*\sjtubeamer@s)
-- (0.17*\sjtubeamer@s,0.06*\sjtubeamer@s)
-- (0.25*\sjtubeamer@s,0)
-- (0.17*\sjtubeamer@s,-0.06*\sjtubeamer@s)
-- (0.17*\sjtubeamer@s,-0.1*\sjtubeamer@s)
-- (-0.17*\sjtubeamer@s,-0.1*\sjtubeamer@s)
-- (-0.17*\sjtubeamer@s,-0.06*\sjtubeamer@s) -- cycle;
}
}
\fi
% \end{macrocode}
% Avoid calling macros in code section for performance reasons.
%
% The newest version of TikZ provides the interface to user-define a pattern.
% Obeying compatibility philosophy, use \verb"\pgfkeyvalueof" interface to get
% parameters in a standard way. The unit is first tested in a standalone file
% and previewed by TikZEdt.
% \end{macro}
%
% \begin{macro}{\stamparray}
% Create the stamp array in the TikZ
% environment.
%
% The first parameter is the pattern size.
%
% The second parameter is the starting
% point. Formatted in \verb"(0,0)".
%
% The third parameter is the ending point.
% Formatted in \verb"(0,0)".
% \begin{macrocode}
\ifx\sjtubeamer@compatible\sjtubeamer@compatible@false
\providecommand{\stamparray}[3]{}
\else
\providecommand{\stamparray}[3]{
% #1: pattern size
% #2: starting point
% #3: ending point
\usebeamercolor{palette primary}
\fill [pattern={stamp[size=#1]},
pattern color=bg!50!fg] #2 rectangle #3;
\def\sjtubeamer@s{#1}%
\pgfmathparse{0.5*\sjtubeamer@s}\let\xs=\pgfmathresult%
\pgfmathparse{-0.4*\sjtubeamer@s}\let\ys=\pgfmathresult%
\fill [pattern={stamp[size=#1,xshift=\xs, yshift=\ys]},
pattern color=bg!50!fg] #2 rectangle #3;
}
\fi
% \end{macrocode}
% NOTICE: \TeX{} is not good at handling parameters. Always remember to store it
% into a temporary variable. Register \verb"\pgfmathresult" will store the result
% of \verb"\pgfmathparse".
% \end{macro}

主要使用了 \tikzdeclarepattern 命令（详见PGF/TikZ 手册 62.3）来定义图案。

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syx-413 avatar syx-413 commented on May 27, 2024

我想移植一下这个命令但是，看了源代码，发现关联的东西很多，可以指明一下这个如何做的吗。：}
image

from sjtubeamer.

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