“命令后附加”是否可以在节点顶部而不是下方绘制？

Question 1

一个path picture选项将调查填充节点

\documentclass{article}
\usepackage{tikz}

\tikzset{%
    simple node/.style = {%
        rectangle, draw%
    },
    barred node/.style = {%
        simple node,% 
        path picture = {\draw ([xshift=-1mm]path picture bounding box.north east) --([xshift=-1mm]path picture bounding box.south east);}
    }%
}

\begin{document}

\begin{tikzpicture}
    % draw the extra path manually - works fine:
    \node[simple node, fill=yellow] at (0,0) (a) {A\,};
    \draw ([xshift=-1mm]a.north east) --([xshift=-1mm]a.south east);

    % without the fill this looks fine. (Note that "\draw node" is necessary, rather than just "\node".)
    \draw node [barred node] at (1,0) (b) {B\,};

    % but with the fill it breaks - the line is drawn behind the node instead of in front of it.
    \draw node [barred node, fill=yellow] at (2,0) (c) {C\,};
\end{tikzpicture}

\end{document}

Answer

一个path picture选项将调查填充节点

\documentclass{article}
\usepackage{tikz}

\tikzset{%
    simple node/.style = {%
        rectangle, draw%
    },
    barred node/.style = {%
        simple node,% 
        path picture = {\draw ([xshift=-1mm]path picture bounding box.north east) --([xshift=-1mm]path picture bounding box.south east);}
    }%
}

\begin{document}

\begin{tikzpicture}
    % draw the extra path manually - works fine:
    \node[simple node, fill=yellow] at (0,0) (a) {A\,};
    \draw ([xshift=-1mm]a.north east) --([xshift=-1mm]a.south east);

    % without the fill this looks fine. (Note that "\draw node" is necessary, rather than just "\node".)
    \draw node [barred node] at (1,0) (b) {B\,};

    % but with the fill it breaks - the line is drawn behind the node instead of in front of it.
    \draw node [barred node, fill=yellow] at (2,0) (c) {C\,};
\end{tikzpicture}

\end{document}

Question 2

每条路径实际上都包含三层：

behind path，
路径本身和
in front of path。

默认情况下，将放置路径上指定的所有节点、图片和边in front of path。（坐标也是如此，但由于它们没有视觉输出，因此可以忽略它们。）

\node但是那些没有放在路径上的 s怎么办呢？好吧，它们仍然在路径上，因为\node只是的快捷方式\path node。

如果您使用，append after command其内容只会添加到正常路径上的节点之后，并且完全独立于节点及其样式（线宽、线条颜色、填充等）。

\draw node这也是为什么你需要或更准确地说的原因\path [draw] node。（\draw也只是的快捷方式\path [draw]）。事实上，你可以这样做

\node [barred node] at (1,0) (b) {B\,} [draw];

该edge操作可帮助解决两个问题：首先，就像节点一样，它将被in front of path默认放置（并且由于它将位于节点之后，因此也将位于节点之上），并且您可以完全控制它的外观。默认设置every edge/.style = drawalready 足以让该线显示出来，而无需使用\draw或[draw]在指定节点的路径上。

对于复杂的图表，指定通常的默认值是明智的，例如draw = black, line to, solid, line cap = rect。

--

红色节点表示节点的变换（包括缩放）无法正确应用于额外的线条（尽管存在解决方案）。此外，线条样式根本不会被继承。

作为一种选项，我添加了一种barred node*样式，将绘图作为背景路径的一部分（它始终是形状的一部分并将继承节点的设置）。

因为它不会被剪裁到矩形内，所以我减去了外面的部分，这样线就会从矩形线的中间开始。

如果rounded corners半径大于 1 毫米，那么看起来也不会好看。

代码

\documentclass[tikz]{standalone}
\makeatletter
\def\tikz@addshape@anchor{\def\anchor##1{\pgf@sh@reanchor{\pgf@sm@shape@name}{##1}}}
\tikzset{
  add to bg path/.code=%
    \tikz@addoption{%
      \toks0\expandafter\expandafter\expandafter{\csname pgf@sh@bg@\tikz@shape\endcsname}%
      \toks1{\begingroup\tikz@addshape@anchor#1\endgroup}%
      \expandafter\edef\csname pgf@sh@bg@\tikz@shape\endcsname{\the\toks0 \the\toks1 }}}
\makeatother
\tikzset{
  simple node/.style = {rectangle, draw},
  barred node/.style = {
    simple node,
    append after command = {
        ([xshift=-1mm]\tikzlastnode.north east)
        edge
        ([xshift=-1mm]\tikzlastnode.south east)}},
  barred node*/.style={
    simple node,
    add to bg path={%
      \pgfpathmoveto{%
        \pgfpointadd{\pgfpoint{-1mm-\pgfkeysvalueof{/pgf/outer xsep}}
                              {-\pgfkeysvalueof{/pgf/outer ysep}}}
                    {\northeast}}% or \anchor{north east}
      \pgfpathlineto{%
        \pgfpointadd{\pgfpoint{-1mm-\pgfkeysvalueof{/pgf/outer xsep}}
                              {\pgfkeysvalueof{/pgf/outer ysep}}}
                    {\anchor{south east}}}}}}
\begin{document}
\begin{tikzpicture}
\node[simple node, fill=yellow]                           at (0,    0) (a) {A\,};
\draw ([xshift=-1mm]a.north east) --([xshift=-1mm]a.south east);
\node [barred node]                                       at (1,    0) (b) {B\,};
\node [barred node, fill=yellow]                          at (2,    0) (c) {C\,};
\tikzset{
  nodes = {dash pattern=on \pgflinewidth off 2.5\pgflinewidth, blue, rotate = 45}}
\node [barred node,  fill=red,   thick, line cap = round] at (0.5, -1) (d) {D\,};
\node [barred node*, fill=green, thick, line cap = round] at (1.5, -1) (e) {E\,};
\end{tikzpicture}
\end{document}

输出

Answer