如何为 TikZ 中的每个节点执行一个宏？

Question

我做了一些实验，并编写了一些代码，希望它们能对你有所帮助。无论如何，这都不是一个完整的解决方案。

看来，一个adviedit可行的宏必须是的形式，\macro{x=<value>,y=<value>}以便whizzytex能够将数字反馈回来。我的第一个想法是简单地为增加一种风格，\node使其看起来像\node[advi={x=<value,y=<value>}]，但这似乎行不通（也许更多的实验会揭示出一种使它工作的方法）。所以我围绕命令定义了一个包装器\node，它在开始时获取坐标，然后将控制权交给原始。由于执行给定选项\node的方式（如），这没有问题。\node\node[draw]

这是代码。我会在代码中对其进行注释。

\documentclass[12pt]{article}
%\url{http://tex.stackexchange.com/q/50468/86}
\usepackage{advi}
\usepackage{tikz}

% We need to use some internal commands with `@`s in them for getting
% the widths of the nodes
\makeatletter
\tikzset{
% This is the workhorse style
  advi/.style={
% We do the advi stuff after the node has been placed so that we can
% get access to its width and height.  What this means is that our
% node ends up being equivalent to
%  \node[at=(x-value,y-value)] {node text} [advi/set advi={x=,y=}];
    append after command={[advi/set advi={#1}]},
% As the advi boxes are specified by lower-left corner, we anchor our
% node at the lower-left so that the given coordinate is the node
% coordinate
    anchor=south west,
% The parameter #1 is of the form "x=<value>,y=<value>".  We trick
% TikZ into taking that as defining some keys in the "/tikz/advi"
% directory
    advi/.cd,
    #1,
% We use the values that have just been set, namely `/tikz/advi/x`
% and `/tikz/advi/y` to specify the location of the node via the
% `at` key.  We need to give the full path as we're currently in at
% `/tikz/advi`
    /tikz/at={(\pgfkeysvalueof{/tikz/advi/x},\pgfkeysvalueof{/tikz/advi/y})}
  },
% This next bit ensures that the `/tikz/advi/x` and `y` keys can be
% used to store values.
  advi/.cd,
  x/.initial=0,
  y/.initial=0,
% This is the part that specifies the boxes in the dvi.  This is
% actually executed after the node has been processed
  set advi/.code={
% As the node has been processed, we can get its width and height by
% looking at a couple of anchors.
    \tikz@scan@one@point\pgfutil@firstofone(\tikzlastnode.north east)
    \pgf@xa=\pgf@x
    \pgf@ya=\pgf@y
    \tikz@scan@one@point\pgfutil@firstofone(\tikzlastnode.south west)
% We adjust the values to be multiples of `em`s as that's the default
% for advi/whizzytex
    \pgfmathsetmacro{\advi@node@w}{(\pgf@xa - \pgf@x)/1em}%
    \pgfmathsetmacro{\advi@node@h}{(\pgf@ya - \pgf@y)/1em}%
% Finally, we call the `\adviedit` command
    \adviedit{comm=\advinode,w=\advi@node@w,h=\advi@node@h,#1}{}%}
  }
}
\makeatother

% This is the command that whizzytex will look for.
\newcommand{\advinode}[1]{%
  \node[advi={#1}]
}

\begin{document}

hello world, how are you?

% We use `em` units as those are the defaults for advi/whizzytex.
% Presumably this could be made configurable or some wizardry used
% to ensure that the tikz coordinates and the advi coordinates
% matched.
\begin{tikzpicture}[x=1em,y=1em]
% We can even pass ordinary styles to the node:
   \advinode{x=13.6805,y=7.3048}[red,draw] {A};
   \advinode{x=5.7699,y=10.5065}[circle,fill=blue!50] {B};
   \advinode{x=6.464,y=6.6085} {C};
   \advinode{x=7.2497,y=7.8264} {D};
   \advinode{x=3.7562,y=6.9931} {E};
   \advinode{x=1.8567,y=12.5472} {F};
   \advinode{x=9.3650,y=7.0893} {G};
   \advinode{x=13.9264,y=4.4529} {H};
   \advinode{x=11.4138,y=11.5331} {I};
   \advinode{x=3.3900,y=2.6800} {J};
\end{tikzpicture}

\end{document}

我不太相信可以在standalone课堂上尝试这个，所以这里提供一个屏幕截图。

带有可拖动节点的 advi

蓝色框和绿线是由绘制的advi。请注意，它们是在下面绘图，因此被节点的边框A和节点的填充区域覆盖B。它们是可拖动的。

绿线表示坐标是相对于某个东西的。实验表明，它们是相对于(0,0)图片内部的 - 这正是它应该的样子。（快速查看代码advi.sty表明，与 PGF 内置函数有一些交互，这可能处理了这一点）。

（最后，这看起来非常有趣，确实值得学习。）

Answer 1