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xtick 标签的位置

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xtick 标签的位置

我如何才能增强 xtick 标签的外观（将它们移至绘制线的顶部）。

    \documentclass[border=5pt]{standalone}
 \usepackage{tikz,pgfplots}           
 \usepackage{xcolor}
  \definecolor{lava}{rgb}{0.81, 0.06, 0.13}
 \definecolor{myblue}{rgb}{0.0, 0.30, 0.60}
\pgfplotsset{compat=newest}
\begin{document}
  \begin{tikzpicture}
\begin{axis}[
     xlabel={$t$(s)},
     grid=both,
    grid style={line width=.1pt, draw=gray!10},
    major grid style={line width=.2pt,draw=gray!50},
     ylabel={$v(t)$},
     axis lines=left,
    scaled ticks=false,
    axis lines=middle,
    minor tick num=4,
    enlargelimits={abs=0.2},


 xmin = 0, xmax =8,
    ymin = -0.5, ymax = 0.5,
    ytick={0,0.5},
    yticklabels={$0$,$V_m$},
    xtick= { 0,1,2,3,4,5,6,7,8},
    xticklabels={0,$T/2$,$T$,$3T/2$,$2T$,$5T/2$,$3T$,$7T/2$,$4T$},
     x tick label style={font=\small, rotate=0,below}                        
            ]

     \addplot[domain=0:1,samples=50

,smooth,lava, ultra thick] {0.5*x};
     \addplot[domain=1:2,samples=50,smooth,lava, ultra thick] {0};
     \addplot[domain=2:3,samples=50,smooth,lava, ultra thick] {-0.5*(x-2)};
     \addplot[domain=3:4,samples=50,smooth,lava, ultra thick] {0};
     \addplot[domain=4:5,samples=50,smooth,lava, ultra thick] {0.5*(x-4)};
     \addplot[domain=5:6,samples=50,smooth,

lava, ultra thick] {0};
      \addplot[domain=6:7,samples=50,smooth,lava, ultra thick] {-0.5*(x-6)};
     \addplot[domain=7:8,samples=50,smooth,lava, ultra thick] {0};
     \draw [ ultra thick, lava,dashed] (1,0) -- (1,0.5);
     \draw [ ultra thick, lava,dashed] (3,0) -- (3,-0.5);
     \draw [ ultra thick, lava,dashed] (5,0) -- (5,0.5);
        \draw [ ultra thick, lava,dashed] (7,0) -- (7,-0.5);

\end{axis}

    \end{tikzpicture}
\end{document}

答案1

默认情况下，图表的高度为\axisdefaultheight。我将标签移动了该高度的一半：xticklabel style={yshift=.5*\axisdefaultheight}

更新 ：

正如@Torbjørn T. 在其评论中所指出的，通过使用 pgf 键\pgfkeysvalueof{/pgfplots/height}而不是 ，该解决方案变得更加通用\axisdefaultheight。

xticklabel style={yshift=.5*\pgfkeysvalueof{/pgfplots/height}}

截屏

\documentclass[border=5pt]{standalone}
\usepackage{pgfplots}           
%\usepackage{xcolor}
\definecolor{lava}{rgb}{0.81, 0.06, 0.13}
\definecolor{myblue}{rgb}{0.0, 0.30, 0.60}
\pgfplotsset{compat=newest}
\begin{document}
\begin{tikzpicture}
\begin{axis}[
    xlabel={$t$(s)},
    grid=both,
    grid style={line width=.1pt, draw=gray!10},
    major grid style={line width=.2pt,draw=gray!50},
    ylabel={$v(t)$},
    axis lines=left,
    scaled ticks=false,
    axis lines=middle,
    minor tick num=4,
    enlargelimits={abs=0.2},
    xmin = 0, xmax =8,
    ymin = -0.5, ymax = 0.5,
    ytick={0,0.5},
    yticklabels={$0$,$V_m$},
    xtick= { 0,1,2,3,4,5,6,7,8},
    xticklabels={0,$T/2$,$T$,$3T/2$,$2T$,$5T/2$,$3T$,$7T/2$,$4T$},
    x tick label style={font=\small, rotate=0,below},
    xticklabel style={yshift=.5*\pgfkeysvalueof{/pgfplots/height}}                     
    ]
     \addplot[domain=0:1,samples=50,smooth,lava, ultra thick] {0.5*x};
     \addplot[domain=1:2,samples=50,smooth,lava, ultra thick] {0};
     \addplot[domain=2:3,samples=50,smooth,lava, ultra thick] {-0.5*(x-2)};
     \addplot[domain=3:4,samples=50,smooth,lava, ultra thick] {0};
     \addplot[domain=4:5,samples=50,smooth,lava, ultra thick] {0.5*(x-4)};
     \addplot[domain=5:6,samples=50,smooth,lava, ultra thick] {0};
     \addplot[domain=6:7,samples=50,smooth,lava, ultra thick] {-0.5*(x-6)};
     \addplot[domain=7:8,samples=50,smooth,lava, ultra thick] {0};
     \draw [ ultra thick, lava,dashed] (1,0) -- (1,0.5);
     \draw [ ultra thick, lava,dashed] (3,0) -- (3,-0.5);
     \draw [ ultra thick, lava,dashed] (5,0) -- (5,0.5);
     \draw [ ultra thick, lava,dashed] (7,0) -- (7,-0.5);
\end{axis}
    \end{tikzpicture}
\end{document}

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