Tikzcd 垂直箭头上的倾斜标签：如何将标签与箭头分开？

Question

我正在尝试使用包sloped中的箭头标签选项tikzcd。使用此选项，标签大多数时候都会与箭头相邻，除非箭头垂直：

\documentclass{standalone}
\usepackage{tikz-cd}
\begin{document}
\begin{tikzcd}
UL & U & UR \\
L & C
\ar[r,"f"{sloped},"g"]
\ar[dr,"f"{sloped},"g"]
\ar[d,"f"{sloped},"g"]
\ar[dl,"f"{sloped},"g"]
\ar[l,"f"{sloped},"g"]
\ar[ul,"f"{sloped},"g"]
\ar[u,"f"{sloped},"g"]
\ar[ur,"f"{sloped},"g"]
& R \\
DL & D & DR
\end{tikzcd}
\end{document}

请注意，对于水平箭头，“倾斜”标签f和普通标签的放置g位置是相同的。但是当箭头不是水平时，放置位置会有所不同，特别是当箭头垂直时，“倾斜”标签f会位于箭头顶部并明显向下偏移，而不是与箭头相邻。

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问题：我想获得垂直箭头的输出，其中标签与箭头对齐倾斜，但放置在箭头旁边而不是箭头上方。我该如何实现？我宁愿不要使用类似的东西rotatebox，因为那样的话，如果我向图表中添加了一些东西，现在之前的垂直箭头指向对角线，我就必须调整所有内容。

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我尝试使用按键调整位置inner sep，但这似乎只能调整向下的偏移量而不能横向移动标签：

\documentclass{standalone}
\usepackage{tikz-cd}
\begin{document}
\begin{tikzcd}
UL & U & UR \\
L & C
\ar[r,"f"{sloped},"g"{sloped,inner sep=-2pt}]
\ar[dr,"f"{sloped},"g"{sloped,inner sep=-2pt}]
\ar[d,"f"{sloped},"g"{sloped,inner sep=-2pt}]
\ar[dl,"f"{sloped},"g"{sloped,inner sep=-2pt}]
\ar[l,"f"{sloped},"g"{sloped,inner sep=-2pt}]
\ar[ul,"f"{sloped},"g"{sloped,inner sep=-2pt}]
\ar[u,"f"{sloped},"g"{sloped,inner sep=-2pt}]
\ar[ur,"f"{sloped},"g"{sloped,inner sep=-2pt}]
& R \\
DL & D & DR
\end{tikzcd}
\end{document}

Answer 1

除了垂直箭头之外，其他所有箭头都可以使用 来处理auto。通过添加选项 auto，Ti钾Z 将以这样一种方式定位曲线和直线上的节点，即它们不在曲线上，而是在曲线旁边。”（pgfmanual 第 54 页）。垂直的节点似乎需要单独处理。

\documentclass{standalone}
\usepackage{tikz-cd}
\begin{document}
\begin{tikzcd}
UL & U & UR \\
L & C
\ar[r,"f"{sloped,auto},"g"{sloped,auto,swap}]
\ar[dr,"f"{sloped,auto},"g"{sloped,auto,swap}]
\ar[d,"f"{sloped,above},"g"{sloped,below}]
\ar[dl,"f"{sloped,auto},"g"{sloped,auto,swap}]
\ar[l,"f"{sloped,auto},"g"{sloped,auto,swap}]
\ar[ul,"f"{sloped,auto},"g"{sloped,auto,swap}]
\ar[u,"f"{sloped,above},"g"{sloped,below}]
\ar[ur,"f"{sloped,auto},"g"{sloped,auto,swap}]
& R \\
DL & D & DR
\end{tikzcd}
\end{document}

Answer 2

使用xshift和yshift。您可能还想使用 来调整对角线标签的位置，以pos控制标签沿边缘的位置。这并不完美，但看起来不错。

\documentclass{standalone}
\usepackage{tikz-cd}
\begin{document}
\begin{tikzcd}
UL & U & UR \\
L & C
\ar[r,"f"{sloped}]
\ar[dr,"f"{sloped, pos=0.4}]
\ar[d,"f"{sloped, yshift = 6pt, xshift=-5pt}]
\ar[dl,"f"{sloped,pos=0.6}]
\ar[l,"f"{sloped}]
\ar[ul,"f"{sloped, pos=0.4}]
\ar[u,"f"{sloped, yshift = 6pt, xshift=5pt}]
\ar[ur,"f"{sloped, pos=0.6}]
& R \\
DL & D & DR
\end{tikzcd}\end{document} 

Answer 3

我不完全理解这一点，但这是我在发布问题后不久偶然发现的解决方案：使用键anchor。看来，如果您设置anchor=south，则标签的位置与标签不倾斜时的位置几乎相同，只是有时看起来像是swap应用了什么的。对于垂直箭头，这既解决了标签位于箭头顶部的问题，也解决了额外的偏移问题。

\documentclass{standalone}
\usepackage{tikz-cd}
\begin{document}
\begin{tikzcd}
UL & U & UR \\
L & C
\ar[r,"f","g"{sloped,anchor=south}]
\ar[dr,"f","g"{sloped,anchor=south}]
\ar[d,"f","g"{sloped,anchor=south}]
\ar[dl,"f","g"{sloped,anchor=south}]
\ar[l,"f","g"{sloped,anchor=south}]
\ar[ul,"f","g"{sloped,anchor=south}]
\ar[u,"f","g"{sloped,anchor=south}]
\ar[ur,"f","g"{sloped,anchor=south}]
& R \\
DL & D & DR
\end{tikzcd}
\end{document}

我最好的猜测是，sloped键会查看anchor键来确定要旋转的位置。但是，经过一些实验，并没有发现anchor键的值可以重现默认sloped标签的位置，所以谁知道呢。