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如何通过不透明度参数来参数化此 chapterimage 命令？

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如何通过不透明度参数来参数化此 chapterimage 命令？

我有以下内容章节图像命令，基于本书模板（Jenny Lantair 撰写的 ILM 报告）我仅通过这一行代码来使用它：\chapterimage{./res/headers/nature.jpg}。

\newcommand{\thechapterimage}{}
\newcommand{\chapterimage}[1]{\renewcommand{\thechapterimage}{#1}}

\def\thechapter{\arabic{chapter}}
\def\@makechapterhead#1{
\thispagestyle{empty}
{\centering
\ifnum \c@secnumdepth >\m@ne
\if@mainmatter
\startcontents
\begin{tikzpicture}[remember picture,overlay]
\node at (current page.north west)
{\begin{tikzpicture}[remember picture,overlay]
\node[anchor=north west,inner sep=0pt] at (0,0) {\includegraphics[width=\paperwidth]{\thechapterimage}};
\draw[anchor=west] (16cm,-25px) node [fill=white!10!white,text opacity=1,draw=white,draw opacity=1,line width=1pt,fill opacity=.6,inner sep=12pt]{\huge\bfseries\textcolor{black}{#1\strut\makebox[22cm]{}}};
\end{tikzpicture}};
\end{tikzpicture}}
\par\vspace*{180\p@}
\fi
\fi}

它运行良好，例如当我使用时：

\chapterimage{./res/headers/nature.jpg}
\chapter{Intakte Natur}

它输出：

在此处输入图片描述

我的问题：目前章节标题后面的白色框的不透明度设置为0.6当我将其设置为例如0.8它将全局应用。我如何通过不透明度参数来扩展它，即：\chapterimage[0.8]{./res/headers/nature.jpg}？我希望能够将某些（不是全部）章节的不透明度设置为单个值（而不是0.6）。

答案1

也许这个方法可以解决问题：

\newcommand\MyExchange[2]{#2#1}%
\newcommand{\MyOpacity}{}
\newcommand{\thechapterimage}{}
\newcommand{\chapterimage}[2][0.6]{%
  \edef\MyOpacity{\unexpanded{#1}}%
  \edef\thechapterimage{\unexpanded{#2}}%
}

\def\thechapter{\arabic{chapter}}
\def\@makechapterhead#1{%
\thispagestyle{empty}%
{\centering
\ifnum \c@secnumdepth >\m@ne
\if@mainmatter
\startcontents
\begin{tikzpicture}[remember picture,overlay]
\node at (current page.north west)
{\begin{tikzpicture}[remember picture,overlay]
\node[anchor=north west,inner sep=0pt] at (0,0) {\includegraphics[width=\paperwidth]{\thechapterimage}};
\expandafter\MyExchange
\expandafter{\MyOpacity}{%
  \draw[anchor=west] (16cm,-25px) node [fill=white!10!white,text opacity=1,draw=white,draw opacity=1,line width=1pt,fill opacity=%
},inner sep=12pt]{\huge\bfseries\textcolor{black}{#1\strut\makebox[22cm]{}}};
\end{tikzpicture}};
\end{tikzpicture}}%
\par\vspace*{180\p@}%
\fi
\fi}

...

\chapterimage[0.8]{./res/headers/nature.jpg}
\chapter{Intakte Natur}

如果您还想更改“填充不透明度”键以外的键的值：

\newcommand\MyExchange[2]{#2#1}%
\newcommand{\MyMoreKeyVals}{}
\newcommand{\thechapterimage}{}
\newcommand{\chapterimage}[2][]{%
  \edef\MyMoreKeyVals{\unexpanded{#1}}%
  \edef\thechapterimage{\unexpanded{#2}}%
}

\def\thechapter{\arabic{chapter}}
\def\@makechapterhead#1{%
\thispagestyle{empty}%
{\centering
\ifnum \c@secnumdepth >\m@ne
\if@mainmatter
\startcontents
\begin{tikzpicture}[remember picture,overlay]
\node at (current page.north west)
{\begin{tikzpicture}[remember picture,overlay]
\node[anchor=north west,inner sep=0pt] at (0,0) {\includegraphics[width=\paperwidth]{\thechapterimage}};
\expandafter\MyExchange
\expandafter{\MyMoreKeyVals}{%
  \draw[anchor=west] (16cm,-25px) node [fill=white!10!white,text opacity=1,draw=white,draw opacity=1,line width=1pt,fill opacity=.6,inner sep=12pt,%
}]{\huge\bfseries\textcolor{black}{#1\strut\makebox[22cm]{}}};
\end{tikzpicture}};
\end{tikzpicture}}%
\par\vspace*{180\p@}%
\fi
\fi}

...

\chapterimage[fill opacity=0.8]{./res/headers/nature.jpg}
\chapter{Intakte Natur}

这是未经测试的，因为您没有提供足够的代码/上下文进行测试。

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