KOMA-Script 的 addmargin 环境与 caption 命令结合使用

Question

我想使用 KOMA-Script 的 addmargin 环境（仅限单面文档）来有时使用文档的整个宽度书写内容，该文档分为 2/3 文本区域和 1/3 边距。

这有效......直到我意识到标题命令没有按照我想要的那样占据整个宽度，请参阅（我当前的代码（我认为只有必要的部分））：

\documentclass[fontsize=12pt,twoside=false,paper=a4,DIV=15,BCOR=0mm,twocolumn=false,footinclude=true,headinclude=true,mpinclude=false]{scrreprt}% KOMAScript
\AfterCalculatingTypearea{%
    %% Margin
    \addtolength{\evensidemargin}{-\marginparwidth}%
    \addtolength{\textwidth}{\marginparwidth}%
    \setlength{\marginparwidth}{.333\textwidth}%
    \addtolength{\textwidth}{-\marginparwidth}%
    \addtolength{\evensidemargin}{\marginparwidth}%
}\recalctypearea%


\newlength{\overhang}%
\setlength{\overhang}{\marginparwidth}%
\addtolength{\overhang}{\marginparsep}%
\newenvironment{fullwidth}{%
    \begin{addmargin}[0em]{-\overhang}%
}{%
    \end{addmargin}%
}%


\usepackage{graphics}
\usepackage{graphicx}
\usepackage{caption}


\usepackage{float}
\usepackage{showframe}
\usepackage{lipsum}
\begin{document}
    %% Works as intended
    \lipsum[1]
    \begin{fullwidth}
        \lipsum[1]
    \end{fullwidth}
    %% Problem with caption
    \newpage
    \begin{figure}[H]\centering
        \includegraphics[width=0.5\linewidth]{example-image-a}
        \caption{This caption is centered as it should be. \lipsum[1]}
    \end{figure}
    \begin{figure}[H]
        \begin{fullwidth}\centering
            \includegraphics[width=0.5\linewidth]{example-image-a}
            \caption{The image is centered, but the caption is NOT ugh... \lipsum[1]}
        \end{fullwidth}
    \end{figure}
\end{document}

输出为： 有人能向我解释如何解决这个问题吗？我只是想让标题使用整个宽度作为图像。如果可能的话，使用 addmargin 环境，因为我已经在文档中经常使用它了。:D

Answer 1

addmargin是trivlist。据我所知，它确实会改变\linewidth，但 也\textwidth不会改变\hsize。但\caption宽度似乎取决于这些。因此，例如使用：

\documentclass[fontsize=12pt,twoside=false,paper=a4,DIV=15,BCOR=0mm,twocolumn=false,footinclude=true,headinclude=true,mpinclude=false]{scrreprt}% KOMAScript
\AfterCalculatingTypearea{%
    %% Margin
    \addtolength{\evensidemargin}{-\marginparwidth}%
    \addtolength{\textwidth}{\marginparwidth}%
    \setlength{\marginparwidth}{.333\textwidth}%
    \addtolength{\textwidth}{-\marginparwidth}%
    \addtolength{\evensidemargin}{\marginparwidth}%
}\recalctypearea%


\newlength{\overhang}%
\setlength{\overhang}{\marginparwidth}%
\addtolength{\overhang}{\marginparsep}%
\newenvironment{fullwidth}{%
  \begin{addmargin}[0em]{-\overhang}%
    \textwidth\linewidth\hsize\linewidth% added
}{%
    \end{addmargin}%
}%


\usepackage{graphics}
\usepackage{graphicx}
\usepackage{caption}


\usepackage{float}
\usepackage{showframe}
\usepackage{lipsum}
\begin{document}
    %% Works as intended
    \lipsum[1]
    \begin{fullwidth}
        \lipsum[1]
    \end{fullwidth}
    %% Problem with caption
    \newpage
    \begin{figure}[H]\centering
        \includegraphics[width=0.5\linewidth]{example-image-a}
        \caption{This caption is centered as it should be. \lipsum[1]}
    \end{figure}
    \begin{figure}[H]
        \begin{fullwidth}\centering
            \includegraphics[width=0.5\linewidth]{example-image-a}
            \caption{The image is centered, but the caption is NOT ugh... \lipsum[1]}
        \end{fullwidth}
    \end{figure}
\end{document}