TikZ 节点定位和 keyval

Question

指定路径上节点位置的最佳方法是什么？我找到的方法并不相同，这让我很困扰。

为什么below right不同于below, right和right, below？ 为什么below right不同于below=1pt, right=1pt和right=1pt, below=1pt？

\documentclass[tikz]{standalone}

\begin{document}

\begin{tikzpicture}
\draw (0,0) [out=40, in=150] to node [very near end, sloped, below right] {curve1} (20:6);
\draw (0,0) [out=40, in=150] to node [very near end, sloped, right, below] {curve2} (20:6);
\draw (0,0) [out=40, in=150] to node [very near end, sloped, below, right] {curve3} (20:6);
\end{tikzpicture}

\begin{tikzpicture}
\draw (0,0) [out=40, in=150] to node [very near end, sloped, right=1pt, below=1pt] {curve1} (20:6);
\draw (0,0) [out=40, in=150] to node [very near end, sloped, below=1pt, right=1pt] {curve2} (20:6);
\end{tikzpicture}

\end{document}

Answer 1

有关定位和锚点的所有内容均在章节中解释17.5 定位节点值得一读。

无论如何，我都会尝试向您提供一些有关此内容的基本想法。

第一个也是最重要的教训是，任何定位命令都会确定要使用的节点的锚点。如果您写入below，则将放置在此位置下方的将是锚点north，如果您写入above right，则所选的锚点将是south east。（您可以在定位选项后选择其他锚点来更改此行为）

第二课，只有最后一个定位选项仍然存在。如果您写入below, right（,它们之间），则right只会应用。

举个例子：

\draw (0,0) [out=40, in=150] to 
node [pos=0, draw, sloped, above left] (al) {above left}
node [pos=0, draw, sloped, below right] {below right} 
node [pos=.5, draw, sloped, right, below] (rb) {right, below}
node [pos=1, draw, sloped, below, right] (br) {below, right}
(20:6);

将产生

第三课：当使用positioning具有明确距离值（如）的新库时，像和above=2mm这样的表达式会产生不同的结果。above right=2mmabove right=2mm and 2mm

例如，以下代码：

\draw (0,0) [out=40, in=150] to coordinate[pos=.5] (aux)
    node [pos=.5, draw, sloped, below right=3pt] {below right} 
    node [pos=.5, draw, sloped, above left=3pt] {above left} 
    node [pos=.5, draw, sloped, above right=3pt and 3pt] {above right} 
    node [pos=.5, draw, sloped, below left=3pt and 7pt] {below left} 
    (20:6);

生成

当然，前面的链接对一切都有更好的解释。

前面示例的完整代码是

\documentclass[tikz]{standalone}

\usetikzlibrary{positioning}

\begin{document}

\begin{tikzpicture}
\draw (0,0) [out=40, in=150] to 
node [pos=0, draw, sloped, above left] (al) {above left}
node [pos=0, draw, sloped, below right] {below right} 
node [pos=.5, draw, sloped, right, below] (rb) {right, below}
node [pos=1, draw, sloped, below, right] (br) {below, right}
(20:6);

\fill[red] (al.south east) circle(1pt);
\fill[red] (rb.north) circle(1pt);
\fill[red] (br.west) circle(1pt);

\end{tikzpicture}

\begin{tikzpicture}
\draw (0,0) [out=40, in=150] to coordinate[pos=.5] (aux)
    node [pos=.5, draw, sloped, below right=3pt] {below right} 
    node [pos=.5, draw, sloped, above left=3pt] {above left} 
    node [pos=.5, draw, sloped, above right=3pt and 3pt] {above right} 
    node [pos=.5, draw, sloped, below left=3pt and 7pt] {below left} 
    (20:6);
\fill[red] (aux) circle(1pt);
\end{tikzpicture}

\end{document}