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如何在 tikz 中绘制更远的边缘

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如何在 tikz 中绘制更远的边缘

在下面的示例中，您可以看到我遇到的问题的说明。我想从节点 s 到 6 绘制一个错误，但我想清除节点 1。\draw从红色虚线可以看出，使用很容易做到。但是，我更希望找到正确的选项并将其包含在命令中\path。非常感谢您的帮助。

在此处输入图片描述

\documentclass[border=10pt]{standalone}
\usepackage[utf8]{inputenc}
\usepackage{amsmath}
\usepackage{tikz}
\usetikzlibrary{arrows.meta, 
                automata,
                intersections,
                positioning,
                quotes,
                matrix
                }
\usetikzlibrary{shapes,arrows,fit}

\begin{document}


\begin{tikzpicture}[auto, node distance = 30mm and 40mm,
        dot/.style = {circle, fill=red, inner sep=2pt, node contents={}},
every state/.style = {circle, draw=red, very thick},
 every edge/.style = {draw=blue, line width=1pt, -Stealth,
                      shorten >=2pt, shorten <=2pt,
                      },
 every edge quotes/.style = {auto, sloped, inner sep=2pt},
       every label/.style = {rectangle, inner sep=2pt, font=\large},
     mincut/.style = {draw=green!40!black, line width=3pt, dashed}
                                              ]

\node[state]  at (0, 0)  (1) [label=left:{ $ $}] {$1$};
\node[state]  (4) [right= of 1, label=right:{ $ $}] {4};
\node[state]  (2) [above=  of 4, label=above:{ $ $}] {2};
\node[state]  (6) [below right=2 and 1.7 of 4, label=below:{ $ $}] {6};

\node[state]  (s) [above=  of 1, label=above:{ $ $}] {s};


\path       (s) edge["{$5,0$}"]                 (1)
                edge["{$1,0$}"]                 (2)
                edge["{$2,0$} ",out=180,in=200] (6)

            (1) edge["{$2,2$}"]                 (2)
                edge["{$3,1$}"]                 (4)
                edge["{$2,2$}"]                 (6);
                
                
\draw[red,->,very thick,dashed] (s) .. controls (-3,-2) .. (6);

\end{tikzpicture}

\end{document}

答案1

我不会说使用附加项\draw就不正确，但looseness除了in和out角度之外，您还可以使用参数。例如，

edge["{$2,0$} ", out=230, in=180, looseness=1.4] (6)

或者，使用 指定自定义路径to path，例如

edge["{$2,0$} ", to path={(\tikztostart) .. controls +(-4,-5) and +(-4,-1) ..  (\tikztotarget) \tikztonodes}] (6)

请参阅第 14.13 节至路径操作在手册中。

下面我也使用该bbox库来获得更好的边界框。

在此处输入图片描述

\documentclass[border=10pt]{standalone}
\usepackage[utf8]{inputenc}
\usepackage{amsmath}
\usepackage{tikz}
\usetikzlibrary{arrows.meta, 
                automata,
                intersections,
                positioning,
                quotes,
                matrix,
                bbox % <-- added
                }
\usetikzlibrary{shapes,arrows,fit}

\begin{document}


\begin{tikzpicture}[auto, node distance = 30mm and 40mm,
        dot/.style = {circle, fill=red, inner sep=2pt, node contents={}},
every state/.style = {circle, draw=red, very thick},
 every edge/.style = {draw=blue, line width=1pt, -Stealth,
                      shorten >=2pt, shorten <=2pt,
                      },
 every edge quotes/.style = {auto, sloped, inner sep=2pt},
       every label/.style = {rectangle, inner sep=2pt, font=\large},
     mincut/.style = {draw=green!40!black, line width=3pt, dashed}
                                              ]

\node[state]  at (0, 0)  (1) [label=left:{ $ $}] {$1$};
\node[state]  (4) [right= of 1, label=right:{ $ $}] {4};
\node[state]  (2) [above=  of 4, label=above:{ $ $}] {2};
\node[state]  (6) [below right=2 and 1.7 of 4, label=below:{ $ $}] {6};

\node[state]  (s) [above=  of 1, label=above:{ $ $}] {s};


\path [bezier bounding box] % for improved bounding box calculation, requires bbox library
            (s) edge["{$5,0$}"]                 (1)
                edge["{$1,0$}"]                 (2)
                edge["{$2,0$} ", out=230, in=180, looseness=1.4] (6)
                edge["{$2,0$} ", red, dashed, to path={(\tikztostart) .. controls +(-3,-7) and +(-5,0) ..  (\tikztotarget) \tikztonodes}] (6)

            (1) edge["{$2,2$}"]                 (2)
                edge["{$3,1$}"]                 (4)
                edge["{$2,2$}"]                 (6)
               ;

\end{tikzpicture}

\end{document}

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