程序包 pgfkeys 错误：我不知道密钥“/tikz/s”，我将忽略它

Question

我不知道应该使用哪些包来使该代码运行，请有人帮帮我。

\begin{tikzpicture}[scale=1.5,font=\footnotesize]

\tikzset{

solid node/.style={circle,draw,inner sep=1.5,fill=black},

hollow node/.style={circle,draw,inner sep=1.5}

}

% Specify spacing for each level of the tree

\tikzstyle{level 1}=[level distance=10mm,sibling distance=37mm]

\tikzstyle{level 2}=[level distance=10mm,sibling distance=20mm]

\tikzstyle{level 3}=[level distance=15mm,sibling distance=10mm]

\tikzstyle arrowstyle=[scale=1]

\tikzstyle directed=[postaction={decorate,decoration={markings,

mark=at position .5 with {\arrow[arrowstyle]{stealth}}}}]



\node(0)[solid node,label=above:{$1$}]{}

child{node(1)[solid node, label=left:{$2$}]{}

child{node(3)[solid node]{}

child{node[hollow node,label=below:{$(6,3)$}]{}edge from parent node[left]{$G$} }

child{node[hollow node,label=below:{$(1,4)$}]{} edge from parent node[right]{$H$}}

edge from parent node[left]{$C$}}

child{node(4)[solid node]{}

child{node[hollow node,label=below:{$(1,2)$}]{}edge from parent node[left]{$G$} }

child{node[hollow node,label=below:{$(3,2)$}]{} edge from parent node[right]{$H$}}

edge from parent node[right]{$D$}

}

edge from parent node[left,xshift=-3]{$A$}

}

child{node(2)[solid node,label=right:{$2$}]{}

child{node(6)[solid node,label=right:{$1$}]{}

child{node[hollow node,label=below:{$(2,3)$}]{}edge from parent node[left]{$I$} }

child{node[hollow node,label=below:{$(1,4)$}]{} edge from parent node[right]{$J$}}

edge from parent node[left]{$E$}}

child{node(7)[solid node,label=right:{$1$}]{}

child{node[hollow node,label=below:{$(2,3)$}]{}edge from parent node[left]{$K$} }

child{node[hollow node,label=below:{$(3,2)$}]{} edge from parent node[right]{$L$}}

edge from parent node[right]{$F$}

}

edge from parent node[right,xshift=3]{$B$}

};



\draw[dashed,rounded corners=10]($(3) + (-.2,.25)$)rectangle($(4) +(.2,-.25)$);


\node at ($(3)!.5!(4)$) {$1$};

\end{tikzpicture}

Answer 1

您的 MWE 中缺少花括号和一个子节点。请参阅@Schrödinger 的猫评论。更正后格式更好的代码是：

\documentclass[tikz,margin=3mm]{standalone}
\usetikzlibrary{fit}

\begin{document}
    \begin{tikzpicture}[scale=1.5,font=\footnotesize]
\tikzset{
 solid node/.style = {circle,draw,inner sep=1.5,fill=black},
hollow node/.style = {circle,draw,inner sep=1.5},
% Specify spacing for each level of the tree
    level 1/.style = {level distance=10mm,sibling distance=37mm},
    level 2/.style = {level distance=10mm,sibling distance=20mm},
    level 3/.style = {level distance=15mm,sibling distance=10mm},
   directed/.style = {postaction={decorate,decoration={markings,
                        mark=at position .5 with {\arrow{stealth}}}}
                     }% where you like to use this style?   
        }% end of tikzset
% tree
\node(0)[solid node,label=above:{$1$}]{}
% left branch
    child{node(1)[solid node, label=left:{$2$}]{}
        child{node(3)[solid node]{}
            child{node[hollow node,label=below:{$(6,3)$}]{} edge from parent node[left]{$G$} }
            child{node[hollow node,label=below:{$(1,4)$}]{} edge from parent node[right]{$H$}}
        edge from parent node[left]{$C$}
            }
        child{node(4)[solid node]{}
            child{node[hollow node,label=below:{$(1,2)$}]{} edge from parent node[left]{$G$} }
            child{node[hollow node,label=below:{$(3,2)$}]{} edge from parent node[right]{$H$}}
        edge from parent node[right]{$D$}
            }
    edge from parent node[left,xshift=-3]{$A$}
        }
% right branch
    child{node(2)[solid node,label=right:{$2$}]{}
        child{node(6)[solid node,label=right:{$1$}]{}
            child{node[hollow node,label=below:{$(2,3)$}]{} edge from parent node[left]{$I$} }
            child{node[hollow node,label=below:{$(1,4)$}]{} edge from parent node[right]{$J$}}
        edge from parent node[left]{$E$}}
        child{node(7)[solid node,label=right:{$1$}]{}
            child{node[hollow node,label=below:{$(2,3)$}]{}edge from parent node[left]{$K$} }
            child{node[hollow node,label=below:{$(3,2)$}]{} edge from parent node[right]{$L$}}
        edge from parent node[right]{$F$}
            }
    edge from parent node[right,xshift=3]{$B$}
        };
%
\node[draw,dashed,rounded corners=10,inner sep=8, 
      fit=(3) (4),
      label=center:$1$] {};
\end{tikzpicture}
\end{document}

Answer 2

错误是由于缺少括号造成的。不过，我还是忍不住要提出一个替代方案：forest。借用这个很好的答案你可以简化代码

\documentclass{article}
\usepackage[edges]{forest}
\forestset{declare toks={elo}{}} % https://tex.stackexchange.com/a/278184
\begin{document}
\begin{forest}
for tree={s sep+=2em,circle,draw,inner sep=1.5pt,
    where n children=0{fill=white}{fill=black},
    decision edge label/.style n args=3{
    edge label/.expanded={node[midway,auto=#1,anchor=#2,\forestoption{elo}]{\strut$#3$}}
  },
  decision/.style={if n=1
    {decision edge label={left}{east}{#1}}
    {decision edge label={right}{west}{#1}}
  },
    }
 [,label=above:1
  [,label=left:2,decision=A
   [,decision=C
    [,label=below:{$(6,3)$},decision=H]
    [,label=below:{$(1,4)$},decision=I]
   ]
   [,decision=D
    [,label=below:{$(1,2)$},decision=J]
    [,label=below:{$(3,2)$},decision=K]
   ]
  ]
  [,label=right:2,decision=B
   [,decision=E
    [,label=below:{$(2,3)$},decision=L]
    [,label=below:{$(1,4)$},decision=M]
   ]
   [,decision=F
    [,label=below:{$(2,3)$},decision=N]
    [,label=below:{$(3,2)$},decision=O]
   ]
  ]
 ]
\end{forest}
\end{document}