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ビーマースタイルのノード内のテキストの色

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ビーマースタイルのノード内のテキストの色

私は「metropolis」Beamer テーマ + fontspec + Fira フォントを基にして、シンプルな .sty ファイルを作成しました。タイトル ページで著者と機関を MWE のように表示する、つまり著者/機関ごとに 1 行ずつ表示するというアイデアが気に入っています。このレイアウトの欠点は、\author マクロと \institution マクロを使用する場合、引数を\\同じ inst. の形式で共著者を区切って渡す必要があることです。align=leftこの処理は が行います。問題は、新しい段落でデフォルトの色である黒が使用され、それ以上の色が使用されないことです\usebeamercolor[fg]{author}。color = \usebeamercolor[fg]{author}ノード定義でを使用するとMissing \endcsname inserted、エラーが発生します。color = whiteは機能します。これは私が今行っていることです。しかし、それは色をハードコーディングすることを意味します。これは避けたほうがよいでしょう。解決策としては、著者のリストを次のように分割することが考えられます。\@authorsリストを\andで分割します著者をループ処理していますが、私がやっていることとしてはやり過ぎのようです。\usebeamercolor[fg]{author}すべての著者に適用するより簡単な方法はありますか?

MWE:

\documentclass[11pt, aspectratio=169]{beamer}  % 
\usetheme[]{metropolis}

% Requirement
\usepackage{tikz}
\usepackage{fontspec}

% colors
\definecolor{BGlightBlu}{HTML}{3461AA}

% Fonts
\newfontfamily{\RuLight}{Rubik Light}

% Settings
\setbeamercolor*{author}{fg = white}


% innertheme 

\defbeamertemplate*{title page}{thisStyle}[1][]
{%

\begin{tikzpicture}[remember picture,overlay]
  \draw[fill=BGlightBlu, BGlightBlu] (current page.south west) rectangle
   (current page.north east);

% Title
\node
[   align=left,
    xshift=.6cm,
    yshift = 1cm, 
    minimum width=0.8\textwidth,
    text width=0.7\textwidth,
    anchor = west, 
    font = {\RuLight \LARGE},
    text = white,
    execute at begin node=\setlength{\baselineskip}{0.7\baselineskip}
] (title) at (current page.west)
{
    \inserttitle
};

% Author 
\node
[   
    below=0.6cm,
    align=left,
    anchor = north west,
    xshift=.6cm,
    font={\RuLight \footnotesize},
    align=left,
%   color=white, %works
%     color = \usebeamercolor[fg]{author}, % 'Missing \endcsname' error
    execute at begin node=\setlength{\baselineskip}{01.2\baselineskip}
] (author) at (title.south west){  \usebeamercolor[fg]{author} \insertauthor
                        };  

% Inst
\node
[   
    xshift = 0.5\textwidth,
    below=0.6cm,
    align=left,
    anchor = north west,
    font={\RuLight \footnotesize},
    align=left,
    color=white,
    execute at begin node=\setlength{\baselineskip}{1.2\baselineskip}
] (inst) at (title.south west){ \insertinstitute };

\end{tikzpicture}
}

\title[]{The title is so long that it needs two lines}
\author[]{Me Myself  \\    My First Coauthor, My Second Coauthor}
\institute[]{My Place alone (MPA)  \\ Their place, together (TPT)} 


\begin{document}

\begin{frame}[plain]
\maketitle
\end{frame}

\end{document}

タイトルフレーム

ここで、エラーを再現するために、コードを BgMWE.tex と beamerthemeMWE.sty に分割しました。

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%  beamerthemeMWE.sty
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

\mode<presentation>
\usetheme[]{metropolis}

% Requirement
\usepackage{tikz}

% Settings
\setbeamercolor*{author}{fg = red}

% innertheme 

\setbeamertemplate{background}{
  \begin{tikzpicture}
  \draw[fill=BGlightBlu, BGlightBlu] (current page.south west) rectangle
   (current page.north east);
  \ifnum\thepage>1\relax%
   \fill[white,opacity=1] (0,0) rectangle(\the\paperwidth,\the\paperheight);
   \fi
  \end{tikzpicture}
}

\defbeamertemplate*{title page}{MWE}[1][]
{%

\begin{tikzpicture}[remember picture,overlay]

% Title
\node
[   align=left,
    xshift=.6cm,
    yshift = 1cm, 
    minimum width=0.8\textwidth,
    text width=0.7\textwidth,
    anchor = west, 
    font = { \LARGE},
    text = white,
    execute at begin node=\setlength{\baselineskip}{0.7\baselineskip}
] (title) at (current page.west)
{
    \inserttitle
};

% Author 
\node
[   
    below=0.6cm,
    align=left,
    anchor = north west,
    xshift=.6cm,
    font={ \footnotesize},
    align=left,
    color = author.fg, % Here is the source of the error
    execute at begin node=\setlength{\baselineskip}{0.8\baselineskip}
] (author) at (title.south west){  \insertauthor
                        };  

% Inst
\node
[   
    xshift = 0.5\textwidth,
    below=0.6cm,
    align=left,
    anchor = north west,
    font={ \footnotesize},
    align=left,
    color=white,
    execute at begin node=\setlength{\baselineskip}{0.8\baselineskip}
] (inst) at (title.south west){ \insertinstitute };

\node[below=0.5cm,
     align=left,
     anchor = north west,
     font={ \large},
     color=white,
] (date) at (author.south west){ \insertdate};
\end{tikzpicture}[action]{%
{\usebeamercolor[fg]{author}}% just to initialize the colour
}
}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%  BgMWE.tex
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\documentclass[11pt, aspectratio=169]{beamer}  % 
\usetheme{MWE}


\title[]{The title is so long that it needs two lines}
\author[]{Me Myself  \\    My First Coauthor, My Second Coauthor}
\institute[]{My Place alone (MPA)  \\ Their place, together (TPT)} 


\begin{document}

\begin{frame}[plain]
\maketitle
\end{frame}

\end{document}

MWE.texをコンパイルするとMWE.tex:14: Package xcolor Error: Undefined color `author.fg'.

Type  H <return>  for immediate help.```

答え1

以前に著者の色を使用したことがある場合 (単純なもので{\usebeamercolor[fg]{author}}十分です)、次のようにして前景コンポーネントにアクセスできますauthor.fg。

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%  BgMWE.tex
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\documentclass[11pt, aspectratio=169]{beamer}% 


\begin{filecontents*}[overwrite]{beamerthemeMWE.sty}
\mode<presentation>
\usetheme{moloch}% modern fork of the metropolis theme

% Requirement
\usepackage{tikz}

\definecolor{BGlightBlu}{HTML}{3461AA}

% Settings
\setbeamercolor*{author}{fg = red}

% innertheme 

\setbeamertemplate{background}{
  \begin{tikzpicture}
  \draw[fill=BGlightBlu, BGlightBlu] (current page.south west) rectangle
   (current page.north east);
  \ifnum\thepage>1\relax%
   \fill[white,opacity=1] (0,0) rectangle(\the\paperwidth,\the\paperheight);
   \fi
  \end{tikzpicture}
}

\defbeamertemplate*{title page}{MWE}[1][]
{%
\begin{tikzpicture}[remember picture,overlay]

% Title
\node
[   align=left,
    xshift=.6cm,
    yshift = 1cm, 
    minimum width=0.8\textwidth,
    text width=0.7\textwidth,
    anchor = west, 
    font = {\LARGE},
    text = white,
    execute at begin node=\setlength{\baselineskip}{0.7\baselineskip}
] (title) at (current page.west)
{\inserttitle};

% Author 
\node
[   
    below=0.6cm,
    align=left,
    anchor = north west,
    xshift=.6cm,
    font={\footnotesize},
    align=left,
    color = author.fg, % Here is the source of the error
    execute at begin node=\setlength{\baselineskip}{0.8\baselineskip}
] (author) at (title.south west){\insertauthor};

% Inst
\node
[   
    xshift = 0.5\textwidth,
    below=0.6cm,
    align=left,
    anchor = north west,
    font={\footnotesize},
    align=left,
    color=white,
    execute at begin node=\setlength{\baselineskip}{0.8\baselineskip}
] (inst) at (title.south west){\insertinstitute};

\node[below=0.5cm,
     align=left,
     anchor = north west,
     font={\large},
     color=white,
] (date) at (author.south west){\insertdate};
\end{tikzpicture}
}

{\usebeamercolor[fg]{author}}
\end{filecontents*}
\usetheme{MWE}


\title[]{The title is so long that it needs two lines}
\author[]{Me Myself  \\    My First Coauthor, My Second Coauthor}
\institute[]{My Place alone (MPA)  \\ Their place, together (TPT)} 


\begin{document}

\begin{frame}[plain]
\maketitle
\end{frame}

\end{document}

ここに画像の説明を入力してください

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