Forest 包：如何在序言中使用 \forestset？

Question

我正在嘗試自動化我希望重複使用的某些樹的佈局，但我似乎無法讓命令\forestset在序言中工作。在下面的程式碼中，我認為一旦此資訊傳遞到序言中，主文檔中文件的註解部分就應該是不必要的。但就目前情況而言，前導資訊無法修改結果樹的預設佈局。 （請注意，這也不會產生編譯錯誤。）

\documentclass[10pt,oneside,pdftex,dvipsnames,a4paper]{article}
\usepackage{forest}
\forestset{ 
  sn edges/.style={
  for tree={
    grow'=0, 
    l=0pt, inner sep=0.075cm, s sep=0.1mm,
    child anchor=west,parent anchor=south,
    anchor=west,calign=first,
    edge path={
      \noexpand\path [draw, \forestoption{edge}]
      (!u.south west) +(7.5pt,0) |- node{} (.child anchor)\forestoption{edge label};
    },
    before typesetting nodes={
      if n=1
        {insert before={[,phantom]}}
        {}
    },
    fit=band,
    before computing xy={l=15pt},
  }
 }
}
%-------------------------------------------------------------
\begin{document}
\begin{forest}
  % for tree={
  %   grow'=0, 
  %   l=0pt, inner sep=0.075cm, s sep=0.1mm,
  %   child anchor=west,parent anchor=south,
  %   anchor=west,calign=first,
  %   edge path={
  %     \noexpand\path [draw, \forestoption{edge}]
  %     (!u.south west) +(7.5pt,0) |- node{} (.child anchor)\forestoption{edge label};
  %   },
  %   before typesetting nodes={
  %     if n=1
  %       {insert before={[,phantom]}}
  %       {}
  %   },
  %   fit=band,
  %   before computing xy={l=15pt},
  % }
[$B$
  [$B_{1}$]
  [$B_{2}$
    [$A$
      [$A_{1}$,tikz={\node [draw,inner sep=0.5pt,fit to=tree]{};}]
      [$A_{2}$
        [$D$]
        [$E$]
      ]
      [$A_{3}$
      ]
    ]
  ]
]
\end{forest}
\end{document}

Answer 1

您在序言中定義了樣式sn edges，但沒有說您希望您的樹使用它。為此，您應該提供樣式名稱作為樹中的鍵。

微量元素：

\documentclass{article}
\usepackage{forest}
\forestset{ 
  sn edges/.style={
  for tree={
    grow'=0, 
    l=0pt, inner sep=0.075cm, s sep=0.1mm,
    child anchor=west,parent anchor=south,
    anchor=west,calign=first,
    edge path={
      \noexpand\path [draw, \forestoption{edge}]
      (!u.south west) +(7.5pt,0) |- node{} (.child anchor)\forestoption{edge label};
    },
    before typesetting nodes={
      if n=1
        {insert before={[,phantom]}}
        {}
    },
    fit=band,
    before computing xy={l=15pt},
  }
 }
}
%-------------------------------------------------------------
\begin{document}
\begin{forest}
sn edges,
[$B$
  [$B_{1}$]
  [$B_{2}$
    [$A$
      [$A_{1}$,tikz={\node [draw,inner sep=0.5pt,fit to=tree]{};}]
      [$A_{2}$
        [$D$]
        [$E$]
      ]
      [$A_{3}$
      ]
    ]
  ]
]
\end{forest}
\end{document}

結果：

default preamble另一種方法是不建立新樣式，而是使用in 中的鍵將給定樣式自動套用到所有樹\forestset。在這種情況下，您不需要為各個樹提供樣式鍵。

\documentclass{article}
\usepackage{forest}
\forestset{ 
  default preamble={
  for tree={
    grow'=0, 
    l=0pt, inner sep=0.075cm, s sep=0.1mm,
    child anchor=west,parent anchor=south,
    anchor=west,calign=first,
    edge path={
      \noexpand\path [draw, \forestoption{edge}]
      (!u.south west) +(7.5pt,0) |- node{} (.child anchor)\forestoption{edge label};
    },
    before typesetting nodes={
      if n=1
        {insert before={[,phantom]}}
        {}
    },
    fit=band,
    before computing xy={l=15pt},
  }
 }
}
%-------------------------------------------------------------
\begin{document}
\begin{forest}
[$B$
  [$B_{1}$]
  [$B_{2}$
    [$A$
      [$A_{1}$,tikz={\node [draw,inner sep=0.5pt,fit to=tree]{};}]
      [$A_{2}$
        [$D$]
        [$E$]
      ]
      [$A_{3}$
      ]
    ]
  ]
]
\end{forest}
\end{document}

Answer 2

您\forestset需要定義forest環境中考慮的名稱的樣式。請參閱下面的 MWE：

\documentclass[a4paper]{article}
\usepackage{forest}
\forestset{my tree/.style = {% NEW
    for tree={
        inner sep=0.075cm, 
        l sep=1mm,% CHANGED AND CORRECTED
        s sep=1mm,% changed
        grow'=0,
        child anchor=west,parent anchor=south,
        anchor=west,calign=first,
        edge path={
          \noexpand\path [draw, \forestoption{edge}]
          (!u.south west) +(7.5pt,0) |- node{} (.child anchor)\forestoption{edge label};
        },
        before typesetting nodes={
          if n=1
            {insert before={[,phantom]}}
            {}
        },
        fit=band,
        before computing xy={l=15pt},
            }% end of for tree
                        }% end of my tree style
        }% end of forestset
%-------------------------------------------------------------
\begin{document}
\begin{forest} my tree
 [$B$
  [$B_{1}$]
  [$B_{2}$
    [$A$
      [$A_{1}$,tikz={\node [draw,inner sep=0.5pt,fit to=tree]{};}]
      [$A_{2}$
        [$D$]
        [$E$]
      ]
      [$A_{3}$
      ]
    ]
  ]
]
\end{forest}
\end{document}