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TikZ：子继承箭头

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TikZ：子继承箭头

我正在尝试使用 TikZ 绘制一些费曼图，但似乎遇到了麻烦，因为父级的箭头也应用于子级，导致一条线上有两个箭头。（我一直在使用示例这里作为我自己创作的基础）

这是我的输出（我知道这个图不正确）：

在此处输入图片描述

如您所见，位置线有两个重叠的箭头，似乎只有箭头是继承的。

代码：

\documentclass[10pt]{revtex4-1}

\usepackage{tikz}

\begin{document}

\usetikzlibrary{decorations.pathmorphing,decorations.markings,trees,positioning,arrows}   

 \tikzset{
    photon/.style={,decorate, decoration={snake}, draw=red},
    particle/.style={,draw=blue, postaction={decorate},
        decoration={markings,mark=at position 0.5 with {\arrow[draw=blue]{>}}}},
    antiparticle/.style={,draw=blue, postaction={decorate},
        decoration={markings,mark=at position 0.5 with {\arrow[draw=blue]{<}}}},
    gluon/.style={,decorate, draw=black,
        decoration={snake,amplitude=4pt, segment length=5pt}}
     }

\begin{tikzpicture}[
        thick,
        level/.style={level distance=2cm},
        level 2/.style={sibling distance=2cm},
    ]
\begin{scope}
\node{}
        child[grow=right]{
            edge from parent [particle]
            child []{
                edge from parent [photon]
                node [above=2pt, anchor=south,shift={(0.2,0)}] {$\gamma$};
            }
            child[] {
                edge from parent [antiparticle]
                node [above=2pt, anchor=south] {$e^+$};
            }
            node [above=3pt](gam) {$e^-$}
         };
  \end{scope}
\end{tikzpicture}

\end{document}

答案1

在每个样式的decoration对应部分中包含每个选项：postaction

\documentclass[10pt]{revtex4-1}
\usepackage{tikz}

\begin{document}

\usetikzlibrary{decorations.pathmorphing,decorations.markings,trees,positioning,arrows}   

 \tikzset{
    photon/.style={decorate, decoration={snake}, draw=red},
    particle/.style={draw=blue,postaction={decorate,
        decoration={markings,mark=at position 0.5 with {\arrow[draw=blue]{>}}}}},
    antiparticle/.style={draw=blue,postaction={decorate,
        decoration={markings,mark=at position 0.5 with {\arrow[draw=blue]{<}}}}},
    gluon/.style={decorate, draw=black,
        decoration={snake,amplitude=4pt, segment length=5pt}}
     }

\begin{tikzpicture}[
        thick,
        level/.style={level distance=2cm},
        level 2/.style={sibling distance=2cm},
    ]
\begin{scope}
\node{}
        child[grow=right]{
            edge from parent [particle]
            child []{
                edge from parent [photon]
                node [above=2pt, anchor=south,shift={(0.2,0)}] {$\gamma$};
            }
            child[] {
                edge from parent [antiparticle]
                node [above=2pt, anchor=south] {$e^+$};
            }
            node [above=3pt](gam) {$e^-$}
         };
  \end{scope}
\end{tikzpicture}

\end{document}

在此处输入图片描述

答案2

对 Claudio Fiandrino 给出的解决方案仅作两点补充/评论：

  1. 如果装饰箭头的颜色与装饰线的颜色相同，则无需定义箭头的颜色，即只需\arrow[draw=blue] {>}说即可\arrow{>}。

  2. 对于与线（边）方向相反的箭头，您也可以使用\arrowreversed{>}。如果您想声明箭头的尖端（例如\arrowreversed{latex}，等等），这很方便。

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