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带有 ulcorner 和 cdot 的推出方形

tag-icon • tag-icon tikz-cd commutative-diagrams
带有 ulcorner 和 cdot 的推出方形

我的问题基本上相当于这解决了一个.我将该代码改编为

\newcommand*{\po}{\mbox{\LARGE{$\mathrlap{\cdot}\ulcorner$}}}

用 tikzcd\ar[dr, phantom, "\po", very near end]但看起来很丑

在此处输入图片描述

如果我\之前添加\cdot：

\newcommand*{\po}{\mbox{\LARGE{$\mathrlap{\ \cdot}\ulcorner$}}}

它变得更好了一点：

在此处输入图片描述

但 cdot 垂直位置还是太低了；我希望它相对于 ulcorner 处于更好的位置解决了一个。如何修复？谢谢！

答案1

我仍然不太确定角点的逻辑含义是什么，但这里有三个想法：

  1. 真正的幻影箭头，即只有箭头尖而没有绘制线的路径。

    对于某些变化，我将定义角、角点以及点角提示以及它们的 TikZ-CD 样式。

    第一张图显示了它们的用法和外观。

  2. 一个角和一个点的图片。它将通过标签放置在四个角之一处。

    它有两种变体：dot corner和dot corner'。前者将放置在 TikZ 矩阵的单元格内，另一个将放置在后面。两者都有其优点和缺点。

  3. dot corner该图片通过或样式沿路径放置dot corner*。

    如果它们直接放置在开始或结束处，它们看起来像 1。但实际上它们可以沿着整个路径放置。

代码

\documentclass{article}
\usepackage{tikz-cd}
%%% Idea 1 (arrow tips)
\tikzcdset{
  only tips/.style={/pgf/tips=true, /tikz/draw=none},
      Corner/.tip={Straight Barb[angle'=90, round]},
  Corner Dot/.tip={Circle[length=+0pt +3, sep=+0pt +1.5] Corner[]},
  Dot Corner/.tip={Corner[reversed, sep=+0pt +1.5] Circle[length=+0pt +3]},
         rightcorner/.style={only tips, /tikz/arrows=      -Corner},
          leftcorner/.style={only tips, /tikz/arrows=Corner-},
     leftrightcorner/.style={only tips, /tikz/arrows=Corner-Corner},
      rightcornerdot/.style={only tips, /tikz/arrows=          -Corner Dot},
       leftcornerdot/.style={only tips, /tikz/arrows=Corner Dot-},
  leftrightcornerdot/.style={only tips, /tikz/arrows=Corner Dot-Corner Dot},
      rightdotcorner/.style={only tips, /tikz/arrows=          -Dot Corner},
       leftdotcorner/.style={only tips, /tikz/arrows=Dot Corner-},
  leftrightdotcorner/.style={only tips, /tikz/arrows=Dot Corner-Dot Corner}}

%%% Idea 2
\tikzset{
  pic/.is if=tikz@node@is@pic,
  dot corner/.pic={% also Idea 3
    \path[pic actions,draw=none,shade=none,-]
      (-1.5\pgflinewidth,1.5\pgflinewidth) circle[radius=1.5\pgflinewidth];
    \path[pic actions,fill=none,shade=none,-,line cap=round,line join=round]
      (-7.5\pgflinewidth,0pt) |- (0pt,7.5\pgflinewidth);},
  dot corner'/.code={\arrow[to path={node also[dot corner={#1}](\tikztostart)}]},
  dot corner/.cd, .is choice,
  north west/.style={label={[draw,fill,pic]north west:dot corner}},
  south west/.style={label={[draw,fill,pic,yscale=-1]south west:dot corner}},
  north east/.style={label={[draw,fill,pic,xscale=-1]north east:dot corner}},
  south east/.style={label={[draw,fill,pic,xscale=-1,yscale=-1]south east:dot corner}}}
\tikzcdset{dot corner'/.style={to path={node also[dot corner={#1}](\tikztostart)}}}
%%% Idea 3
\tikzcdset{
  /tikz/pics/dot corner*/.style={/tikz/sloped, /tikz/allow upside down,
    /tikz/rotate=45, /tikz/draw, /tikz/fill, dot corner},
  dot corner/.style ={path only, /tikz/every to/.append style={
    edge node={pic[{draw,fill,#1}]{dot corner*}}}},
  dot corner*/.style={path only, /tikz/every to/.append style={
    edge node={pic[{draw,fill,xscale=-1,#1}]{dot corner*}}}}}
\begin{document}
\begin{tikzcd}[every matrix/.append style={label=below:Idea 1}]
  A \rar[leftrightdotcorner] \dar[rightcorner]
& B \dar[leftrightcornerdot] \\
  C \rar[rightcornerdot]
& D \ular[leftdotcorner]
\end{tikzcd}\quad
\begin{tikzcd}[every matrix/.append style={label=below:Idea 2 (inside cell)}]
  |[dot corner=south east]| A \rar \dar
&                           B \dar \\
                            C \rar
& |[dot corner=north west]| D
\end{tikzcd}\quad
\begin{tikzcd}[every matrix/.append style={label=below:Idea 2 (later)}]
  A \rar \dar \ar[dot corner'=south east]
& B \dar \\
  C \rar
& |[dot corner'=north west]| D
\end{tikzcd}\quad
\begin{tikzcd}[every matrix/.append style={label=below:Idea 2/3}]
  |[dot corner/.list={north west, north east, south west, south east}]| A \rar \dar
& B \dar \\
  C \rar \urar[dot corner*=near start, dot corner=near end]
& |[dot corner'/.list={north west, north east, south west, south east}]|D
\end{tikzcd}
\end{document}

代码（仅限想法 2）

\documentclass{article}
\usepackage{tikz-cd}
\tikzset{
  pic/.is if=tikz@node@is@pic,
  dot corner/.pic={
    \path[pic actions,draw=none,shade=none,-]
      (-1.5\pgflinewidth,1.5\pgflinewidth) circle[radius=1.5\pgflinewidth];
    \path[pic actions,fill=none,shade=none,-,line cap=round,line join=round]
      (-7.5\pgflinewidth,0pt) |- (0pt,7.5\pgflinewidth);},
  dot corner'/.code={\arrow[to path={node also[dot corner={#1}](\tikztostart)}]},
  dot corner/.cd, .is choice,
  north west/.style={label={[draw,fill,pic]north west:dot corner}},
  south west/.style={label={[draw,fill,pic,yscale=-1]south west:dot corner}},
  north east/.style={label={[draw,fill,pic,xscale=-1]north east:dot corner}},
  south east/.style={label={[draw,fill,pic,xscale=-1,yscale=-1]south east:dot corner}}}
\tikzcdset{dot corner'/.style={to path={node also[dot corner={#1}](\tikztostart)}}}
\begin{document}
\begin{tikzcd}[every matrix/.append style={label=below:Idea 2 (inside cell)}]
  |[dot corner=south east]| A \rar \dar
&                           B \dar \\
                            C \rar
& |[dot corner=north west]| D
\end{tikzcd}\quad
\begin{tikzcd}[every matrix/.append style={label=below:Idea 2 (later)}]
  A \rar \dar \ar[dot corner'=south east]
& B \dar \\
  C \rar
& |[dot corner'=north west]| D
\end{tikzcd}
\end{document}

输出

在此处输入图片描述

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