在 tcolorbox 中創建筆記本紙的外觀；繪製正確的行數時出現問題

Question 1

我建議用tcolorbox的子皮enhanced（適合易碎的盒子）來完成此操作。在下面給出的程式碼中，我們定義了一個名為的皮膚，paper該皮膚源自enhanced，並使tcolorbox樣式paper執行skin=paper（除其他外，例如設定所需的框架和背景顏色）。我們也定義了三個子皮膚paperfirst，papermiddle和paperlast分別源自enhancedfirst、enhancedmiddle和enhancedlast；這些使我們能夠在所有情況下為盒子提供所需的外觀（未破損、頂部破損但底部未破損、底部破損但頂部未破損、頂部和底部均破損）。

由於enhanced皮膚設置/tcb/geometry nodes=true，它定義了名為frame、interior、的節點segmentation，title這允許我們訪問的有趣點tcolorbox。在這裡，可以使用任一frame來interior計算框高度（這些不會給出完全相同的結果，因為/tcb/leftrule、和屬於，/tcb/toprule但不屬於）。在下面定義的皮膚中，我們使用節點來計算要繪製的水平線的數量，以及垂直線範圍的合適組合，這取決於盒子是否在頂部破裂以及是否在底部破裂。例如，可以使用來計算要繪製的水平線的數量（也可以在呼叫內部完成）。/tcb/rightrule/tcb/bottomruleframeinteriorpaperinteriorframeinterior\pgfmathtruncatemacroint()\pgfmathsetmacro

normal lines注意：我對你的風格做了一個小小的改變。較大line width，但規則是用繪製的opacity=...，如所定義的/tcb/paper/rule opacity。這張圖是在一個內部完成的，transparency group其目的是確保規則交叉點不會比規則中的其他地方更暗。

\documentclass{article}
\usepackage{tcolorbox}
\tcbuselibrary{breakable, skins}
\usepackage{tikz}
\usetikzlibrary{calc}
\usepackage{lipsum}

\makeatletter

\tikzset{normal lines/.style={gray, thin}}
\tcbset{paper/left margin/.initial=1.25in,
        paper/line spacing/.initial=1cm,
        paper/rule opacity/.initial=0.4,
        paper/.style={
          skin=paper, colback=green!10, colframe=green!65!black,
          breakable, left=1.3in,
        }
}

\newif\if@paper@broken@top
\newif\if@paper@broken@bottom
\pgfkeys{/tcb/paper/broken top/.is if=@paper@broken@top,
         /tcb/paper/broken bottom/.is if=@paper@broken@bottom
}

% The various parts don't have the same skin when a box is broken. This also
% influences where we want the vertical rule to extend to.
\tcbsubskin{paperfirst}{enhancedfirst}{
  paper/broken top=false, paper/broken bottom=true
}
\tcbsubskin{papermiddle}{enhancedmiddle}{
  paper/broken top=true, paper/broken bottom=true
}
\tcbsubskin{paperlast}{enhancedlast}{
  paper/broken top=true, paper/broken bottom=false
}

\tcbsubskin{paper}{enhanced}{
  skin first=paperfirst, skin middle=papermiddle, skin last=paperlast,
  paper/broken top=false, paper/broken bottom=false,
  overlay={
    \begin{tcbclipinterior}
    \begin{scope}[opacity=\pgfkeysvalueof{/tcb/paper/rule opacity},
                  transparency group]
    % Make sure the vertical rule extends exactly as far as we want, depending
    % on where the box is broken.
    \if@paper@broken@top
      \coordinate (top for vert rule) at (frame.north west);
    \else
      \coordinate (top for vert rule) at (interior.north west);
    \fi
    %
    \if@paper@broken@bottom
      \coordinate (bottom for vert rule) at (frame.south west);
    \else
      \coordinate (bottom for vert rule) at (interior.south west);
    \fi
    %
    \draw[transform canvas={xshift=\pgfkeysvalueof{/tcb/paper/left margin}},
          style=normal lines] (top for vert rule) -- (bottom for vert rule);
    %
    \path let \p1=($(interior.north)-(interior.south)$) in
      \pgfextra{%
        \pgfmathtruncatemacro{\tmp}{veclen(\p1) /
                                    \pgfkeysvalueof{/tcb/paper/line spacing}}%
        \xdef\paperskin@nblines{\tmp}};
    \foreach \i in {1,..., \paperskin@nblines} {
       \pgfmathsetlengthmacro{\paperskin@shift}{
         -\i*\pgfkeysvalueof{/tcb/paper/line spacing}}
       \draw[style=normal lines]
         ([yshift=\paperskin@shift]interior.north west) --
         ([yshift=\paperskin@shift]interior.north east);
    }
    \end{scope}
    \end{tcbclipinterior}
  },
}

\makeatother

\pagestyle{empty}

\begin{document}

\lipsum[1]
\begin{tcolorbox}[paper]
\lipsum[2]
\end{tcolorbox}

\lipsum[3]
\begin{tcolorbox}[paper]
\lipsum[4-5]
\end{tcolorbox}

\end{document}

未破損的盒子：

first破損盒子的一部分：

last破損盒子的一部分：

Amiddle（頂部破損和底部）也可以畫得很好，垂直線可以延伸到所需的距離：

注意：我的程式碼的以下部分：

\tcbsubskin{paper}{enhanced}{
  ...
  overlay={
    ...
    % Make sure the vertical rule extends exactly as far as we want, depending
    % on where the box is broken.
    \if@paper@broken@top
      \coordinate (top for vert rule) at (frame.north west);
    \else
      \coordinate (top for vert rule) at (interior.north west);
    \fi
    %
    \if@paper@broken@bottom
      \coordinate (bottom for vert rule) at (frame.south west);
    \else
      \coordinate (bottom for vert rule) at (interior.south west);
    \fi

也可以這樣寫：

\newcommand*{\paper@defcoord}[3]{
  \coordinate (#2 for vert rule) at (#1.#3 west);
}

\tcbsubskin{paper}{enhanced}{
  ...
  overlay={
    ...
    % Make sure the vertical rule extends exactly as far as we want, depending
    % on where the box is broken.
    \edef\tmp{\if@paper@broken@top frame\else interior\fi}
    \expandafter\paper@defcoord\expandafter{\tmp}{top}{north}
    \edef\tmp{\if@paper@broken@bottom frame\else interior\fi}
    \expandafter\paper@defcoord\expandafter{\tmp}{bottom}{south}

但第一種方法似乎更容易閱讀，因此我決定將其保留在完整的範例中。

Answer