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將節點放在圖的中間

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將節點放在圖的中間

我有一個由幾行組成的圖形：

\begin{tikzpicture}
    \shade[top color=black,bottom color=white] (-2,2) rectangle (2,1.75) node [above] {$n_2$};
    \shade[top color=white, bottom color=black] (-2,0.75) rectangle (2,0.5);
    \draw (-2,2)--(2,2);
    \draw (-2,1.75)--(2,1.75);
    \draw (-2,0.75)--(2,0.75);
    \draw (-2,0.5)--(2,0.5);

    \draw[blue, very thick, ->] (-3,2)--(-1.75,0.75) -- (-0.75,1.75)--(0.25,0.75)--(1.25,1.75)--(3.25,-0.25);
    \draw[red, very thick, ->] (-3,1)--(-1.75,0.75)--(3.25,1.75);
    \draw[green, very thick, ->] (-3,3)--(-1.75,0.75)--(-1.5,0.5)--(-0.5,0);
    \node (-1.5,0.5) {$n_2$};
    \node (10,10) {$n_1$};
    \end{tikzpicture}

現在我想將名稱為 $n_1$ 的節點放在水平線的中間（即點 (0,1) 處）。但無論我在那裡輸入的值如何，節點都不會移動，它始終與名稱為 $n_2$ 的第二個節點保持在同一位置。為什麼？我怎樣才能移動它？

答案1

正如彼得所說，你應該添加at來指定座標。但是，您不需要這些額外的節點。您可以將節點直接新增到上面的“欄”。您可以為任何路徑新增節點，矩形仍然是路徑。

輸出

在此輸入影像描述

程式碼

\documentclass[margin=10pt]{standalone}
\usepackage{tikz}

\begin{document}
\begin{tikzpicture}
    \shade[top color=black,bottom color=white] (-2,2) rectangle (2,1.75) node [midway,above, inner sep=6pt] {$n_2$};
    \shade[top color=white, bottom color=black] (-2,0.75) rectangle (2,0.5) node [midway, below, inner sep=6pt] {$n_1$};
    \draw (-2,2)--(2,2);
    \draw (-2,1.75)--(2,1.75);
    \draw (-2,0.75)--(2,0.75);
    \draw (-2,0.5)--(2,0.5);

    \draw[blue, very thick, ->] (-3,2)--(-1.75,0.75) -- (-0.75,1.75)--(0.25,0.75)--(1.25,1.75)--(3.25,-0.25);
    \draw[red, very thick, ->] (-3,1)--(-1.75,0.75)--(3.25,1.75);
    \draw[green, very thick, ->] (-3,3)--(-1.75,0.75)--(-1.5,0.5)--(-0.5,0);
    \end{tikzpicture}
\end{document}

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