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尽可能将 tikz 节点推至轴限制

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尽可能将 tikz 节点推至轴限制

我想将节点放置在尽可能靠近轴限值但仍在轴内的直线上，而不管节点文本的长度如何。虽然我能够使用 为首先达到最大 x 值的标签执行此操作restrict domain，但对于首先达到最大 y 值的标签则不起作用。原因是锚点north east先于锚点到达它south east。但是，如果更改锚点，则文本会移到线的另一侧，而我不希望出现这种情况。

有没有办法做到这一点，而不用pos=x像我对“斜率 6”所做的那样手动定位节点？计算 x 是可能的，但如何将节点的高度转换为轴坐标？

非常感谢。

\documentclass[11pt,a4paper]{article}
\usepackage{pgfplots}
\pgfplotsset{compat=1.14}
\begin{document}
\begin{figure}
\centering
\begin{tikzpicture}[inner sep=1.5pt,scale=1.4]
\begin{axis}[xmin=3.0, xmax=8.0, ymin=10.0, ymax=35.0,
restrict x to domain=\pgfkeysvalueof{/pgfplots/xmin}:\pgfkeysvalueof{/pgfplots/xmax},
restrict y to domain=\pgfkeysvalueof{/pgfplots/ymin}:\pgfkeysvalueof{/pgfplots/ymax},samples=200]
\addplot[domain=\pgfkeysvalueof{/pgfplots/xmin}:\pgfkeysvalueof{/pgfplots/xmax}]{3*x} node [at end,draw,anchor=south east,sloped] () {\scriptsize Slope 3};
\addplot[domain=\pgfkeysvalueof{/pgfplots/xmin}:\pgfkeysvalueof{/pgfplots/xmax}]{4*x} node [at end,draw,anchor=south east,sloped] () {\scriptsize Slope 4};
\addplot[domain=\pgfkeysvalueof{/pgfplots/xmin}:\pgfkeysvalueof{/pgfplots/xmax}]{5*x} node [at end,draw,anchor=south east,sloped] () {\scriptsize Slope 5};
\addplot[domain=\pgfkeysvalueof{/pgfplots/xmin}:\pgfkeysvalueof{/pgfplots/xmax}]{6*x} node [pos=.9,draw,anchor=south east,sloped] () {\scriptsize Slope 6};
\addplot[domain=\pgfkeysvalueof{/pgfplots/xmin}:\pgfkeysvalueof{/pgfplots/xmax}]{7*x} node [at end,draw,anchor=south east,sloped] () {\scriptsize Slope 7};
\end{axis}
\end{tikzpicture}
\end{figure}
\end{document}

答案1

您可以用calc它来计算位置。

\documentclass[11pt,a4paper]{article}
\usepackage{pgfplots}
\usetikzlibrary{calc}
\pgfplotsset{compat=1.14}
\begin{document}
\begin{figure}
\centering
\begin{tikzpicture}[inner sep=1.5pt,box/.style={draw,font=\scriptsize}]
\begin{axis}[xmin=3.0, xmax=8.0, ymin=10.0, ymax=35.0,,scale=1.4,
restrict x to domain=\pgfkeysvalueof{/pgfplots/xmin}:\pgfkeysvalueof{/pgfplots/xmax},
restrict y to domain=\pgfkeysvalueof{/pgfplots/ymin}:\pgfkeysvalueof{/pgfplots/ymax},samples=200]
\addplot[domain=\pgfkeysvalueof{/pgfplots/xmin}:\pgfkeysvalueof{/pgfplots/xmax}]{3*x}
node [at end,box,anchor=south east,sloped] (s3) {Slope 3};
\addplot[domain=\pgfkeysvalueof{/pgfplots/xmin}:\pgfkeysvalueof{/pgfplots/xmax}]{4*x} 
node [at end,box,anchor=south east,sloped] (s4) {Slope 4};
\addplot[domain=\pgfkeysvalueof{/pgfplots/xmin}:\pgfkeysvalueof{/pgfplots/xmax}]{5*x} 
coordinate[pos=0] (p50) coordinate[pos=1] (p51);
\addplot[domain=\pgfkeysvalueof{/pgfplots/xmin}:\pgfkeysvalueof{/pgfplots/xmax}]{6*x} 
coordinate[pos=0] (p60) coordinate[pos=1] (p61);
\addplot[domain=\pgfkeysvalueof{/pgfplots/xmin}:\pgfkeysvalueof{/pgfplots/xmax}]{7*x} 
coordinate[pos=0] (p70) coordinate[pos=1] (p71);
\end{axis}
\path (current axis.north west) coordinate (NW)
      (current axis.north east) coordinate (NE)
     let \p1=($(s3.north)-(s3.south)$),
    \p5=($(p51)-(p50)$),\n5={atan2(\y5,\x5)},
    \p6=($(p61)-(p60)$),\n6={atan2(\y6,\x6)},
    \p7=($(p71)-(p70)$),\n7={atan2(\y7,\x7)}
    in
    foreach \X in {5,6,7}
    {($(intersection of p\X0--p\X1 and NW--NE)+(\n\X+180:{(\y1+1pt)/tan(\n\X)})$)
    node[box,anchor=south east,rotate=\n\X]{Slope \X}}
    ;
\end{tikzpicture}
\end{figure}
\end{document}

在此处输入图片描述

请注意，如果您真的想要使用scale，请在 的选项中使用它axis，而不是在 环境中tikzpicture。在大多数情况下，我们并不需要它，我们可以调整轴的width和，但我把它保留了下来。height

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