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tikz 中的弧形节点填充不一致

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tikz 中的弧形节点填充不一致

我在 tikz 中绘制了一个简单的力图。放置在弧上的节点背景已填充；这适用于我的三个弧中的两个。第一个确实显示了彩色背景，但它位于弧后面，因此弧会显示出来。当我重新排列命令的顺序时，仍然是第一个执行的命令具有“错误”的背景。

\documentclass{amsart}
\usepackage{tikz}
\usetikzlibrary{calc, arrows}

\begin{document}

\Large
\thispagestyle{empty}
\centering
\tikz[scale=1.5]{
    \coordinate (C) at (0,0);
    \fill[black] (C) circle (4pt) node[above, outer sep=3mm] {$C$};
    \draw[very thick,->, >=stealth] (C) -- (180:3) node[above] {$BC$ (known)};
    \draw[very thick,->, >=stealth] (C) -- (216.8:3) node[below] {$CG$ (known)};
    \draw[very thick,->, >=stealth] (C) -- (-90:3) node[below] {$CF$ (known)};
    \draw[very thick,->, >=stealth] (C) -- (-58:3) node[below] {$CE$};
    \draw[very thick,->, >=stealth] (C) -- (26.6:3) node[above] {$CD$ };
    \draw[very thick, dashed] (C) -- (-0:3);
    \draw[thick, <->, >=stealth] ($ (C)+(2,0) $)arc (0:-58:2) node[fill = pink, inner sep = 0.125em] at ($ (C)+(199:2) $) {$\theta$ (known)};
    \draw[thick, <->, >=stealth] ($ (C)+(2,0) $)arc (0:26.6:2) node[fill=pink, inner sep = 0.125em] at ($ (C)+(10:2) $) {$\alpha$ (known)};
    \draw[thick, <->, >=stealth] ($ (C)+(-2,0) $)arc (180:216.8:2) node[fill=pink, inner sep = 0.125em] at ($ (C)+(335:2) $) {$\phi$ (known)};
}

\end{document}

有人能看出我哪里错了吗？

谢谢，戴夫

答案1

您绘制了标签$\theta$ (known)（在最后一行之前的第三行），然后绘制了弧线（最后一行）。因此，标签的顺序应固定如下（请注意，我将其\theta与互换\phi，以保持绘制弧线然后在顶部绘制标签的正确顺序）：

\documentclass{amsart}
\usepackage{tikz}
\usetikzlibrary{calc, arrows}

\begin{document}

\Large
\thispagestyle{empty}
\centering
\tikz[scale=1.5,>=stealth]{
    \coordinate (C) at (0,0);
    \fill (C) circle (4pt) node[above, outer sep=3mm] {$C$};
    \draw[very thick,->] (C) -- (180:3) node[above] {$BC$ (known)};
    \draw[very thick,->] (C) -- (216.8:3) node[below] {$CG$ (known)};
    \draw[very thick,->] (C) -- (-90:3) node[below] {$CF$ (known)};
    \draw[very thick,->] (C) -- (-58:3) node[below] {$CE$};
    \draw[very thick,->] (C) -- (26.6:3) node[above] {$CD$ };
    \draw[very thick, dashed] (C) -- (-0:3);
    \draw[thick, <->] ($(C)+(2,0) $) arc (0:-58:2)     node[fill=pink, inner sep = 0.125em] at ($ (C)+(335:2)$){$\phi$ (known)};
    \draw[thick, <->] ($(C)+(2,0) $) arc (0:26.6:2)    node[fill=pink, inner sep = 0.125em] at ($ (C)+(10:2) $){$\alpha$ (known)};
    \draw[thick, <->] ($(C)+(-2,0)$) arc (180:216.8:2) node[fill=pink, inner sep = 0.125em] at ($ (C)+(199:2)$){$\theta$ (known)};
}

\end{document}

在此处输入图片描述

答案2

这里不需要计算节点的位置。你可以简单地通过添加到节点选项中midway沿弧线添加它们。midway

您还可以通过合理使用范围来避免连续重复样式选项，从而使代码更加灵活且更易于理解。

例如，

\documentclass[border=10pt,multi,tikz,dvipsnames]{standalone}
\usetikzlibrary{calc,arrows.meta}
\begin{document}
\tikz[scale=1.5,>=Stealth]{
    \coordinate (C) at (0,0);
    \fill (C) circle (4pt) node[above, outer sep=3mm] {$C$};
    \begin{scope}[very thick, ->]
      \draw (C) -- (180:3) node[above] {$BC$ (known)};
      \draw (C) -- (216.8:3) node[below] {$CG$ (known)};
      \draw (C) -- (-90:3) node[below] {$CF$ (known)};
      \draw (C) -- (-58:3) node[below] {$CE$};
      \draw (C) -- (26.6:3) node[above] {$CD$ };
    \end{scope}
    \draw[very thick, dashed] (C) -- (-0:3);
    \begin{scope}[thick, <->, every node/.style={midway, fill=pink, inner sep = 0.125em}]
      \draw  ($(C)+(2,0) $) arc (0:-58:2)     node {$\phi$ (known)};
      \draw ($(C)+(2,0) $) arc (0:26.6:2)    node {$\alpha$ (known)};
      \draw  ($(C)+(-2,0)$) arc (180:216.8:2) node {$\theta$ (known)};
    \end{scope}
}
\end{document}

自动放置弧线上的节点

如果你愿意，你也可以让它更简洁。然而，这可能会使代码更难理解，而不是更容易理解。

例如，以下是等效的。

\documentclass[border=10pt,multi,tikz,dvipsnames]{standalone}
\usetikzlibrary{calc,arrows.meta}
\begin{document}
\tikz[scale=1.5,>=Stealth]{
    \draw [very thick, ->, fill] (0,0) coordinate (C) circle (4pt) node[above, outer sep=3mm] {$C$} (C) foreach \i/\j/\k in {180:3/above/{$BC$ (known)},216.8:3/below/{$CG$ (known)},-90:3/below/{$CF$ (known)},-58:3/below/{$CE$},26.6:3/above/{$CD$}} { edge node [\j, at end] {\k} (\i) };
    \draw[very thick, dashed] (C) -- (-0:3);
    \foreach \i/\j/\k in {+/0:-58:2/\phi,+/0:26.6:2/\alpha,-/180:216.8:2/\theta}
    \draw [thick, <->] ($(C)+(\i 2,0)$) arc (\j) node [midway, fill=pink, inner sep = 0.125em] {$\k$ (known)};
}
\end{document}

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