取得兩個軸上刻度之間的 pgfplot 的單位 (DIN 461)

Question

正如線程中一樣 取得 pgfplot (DIN 461) 自動產生的刻度距離 已經問過，我正在尋找一種方法來獲取最後兩個刻度之間的單位。上述線程的解決方案適用於一個軸。我嘗試擴展兩個軸的代碼，但這僅適用於軸上。我究竟做錯了什麼？

\documentclass{standalone}
\usepackage{pgfplots}
\pgfplotsset{compat=newest}
\usepackage{siunitx}

\pgfplotsset{
    din xunit/.style={
        xticklabel style={
            name=xlabel\ticknum,
            append after command=\pgfextra{\xdef\lastxticknum{\ticknum}}
        },
        after end axis/.code={
            \pgfmathparse{int(\lastxticknum-1)}
            \path (xlabel\lastxticknum.base) -- (xlabel\pgfmathresult.base) node [midway, anchor=base] {#1};
        }
    },
    din yunit/.style={
        yticklabel style={
            name=ylabel\ticknum,
            append after command=\pgfextra{\xdef\lastyticknum{\ticknum}}
        },
        after end axis/.code={
            \pgfmathparse{int(\lastyticknum-1)}
            \path (ylabel\lastyticknum.base) -- (ylabel\pgfmathresult.base) node [midway, anchor=base] {#1};
        }
    }
}

\begin{document}
  \begin{tikzpicture}
    \begin{axis}[din xunit=\si{\second}, din yunit=\si{\meter}]
      \addplot table {
        0 0
        1 3
        2 4
      };
    \end{axis}
  \end{tikzpicture}
\end{document}

Answer 1

這是因為第二個after end axis/.code會覆蓋第一個。於是，改變.code就.append code解決了問題。

% used PGFPlots v1.15
\documentclass[border=5pt]{standalone}
\usepackage{siunitx}
\usepackage{pgfplots}
    \pgfplotsset{
        compat=1.15,
        din xunit/.style={
            xticklabel style={
                name=xlabel\ticknum,
                append after command=\pgfextra{\xdef\lastxticknum{\ticknum}}
            },
            % changed `.code' to `.append code'
            after end axis/.append code={
                \pgfmathparse{int(\lastxticknum-1)}
                \path (xlabel\lastxticknum.base) -- (xlabel\pgfmathresult.base) node [midway, anchor=base] {#1};
            },
        },
        din yunit/.style={
            yticklabel style={
                name=ylabel\ticknum,
                append after command=\pgfextra{\xdef\lastyticknum{\ticknum}}
            },
            % changed `.code' to `.append code'
            after end axis/.append code={
                \pgfmathparse{int(\lastyticknum-1)}
                \path (ylabel\lastyticknum.base) -- (ylabel\pgfmathresult.base) node [midway, anchor=base] {#1};
            },
        },
    }

\begin{document}
\begin{tikzpicture}
    \begin{axis}[
        din xunit=\si{\second},
        din yunit=\si{\meter},
    ]
        \addplot table {
            0 0
            1 3
            2 4
        };
    \end{axis}
\end{tikzpicture}
\end{document}

Answer 2

您可能需要包含將軸全部繪製在一起的程式碼：

\documentclass{standalone}
\usepackage{pgfplots}
\pgfplotsset{compat=newest}
\usepackage{siunitx}

\pgfplotsset{
    din label/.style args={#1 and #2}{
        xticklabel style={
            name=xlabel\ticknum,
            append after command=\pgfextra{\xdef\xlastticknum{\ticknum}}
        },
        yticklabel style={
            name=ylabel\ticknum,
            append after command=\pgfextra{\xdef\ylastticknum{\ticknum}}
        },
        after end axis/.code={
            \pgfmathparse{int(\xlastticknum-1)}
            \path (xlabel\xlastticknum.base) -- (xlabel\pgfmathresult.base) node [midway, anchor=base] {#1};
            \pgfmathparse{int(\ylastticknum-1)}
            \path (ylabel\ylastticknum.base) -- (ylabel\pgfmathresult.base) node [midway, anchor=base] {#2};
        }
    }
}


\begin{document}
  \begin{tikzpicture}
    \begin{axis}[din label=\si{\second} and \si{\meter}]
      \addplot table {
        0 0
        1 3
        2 4
      };
    \end{axis}
  \end{tikzpicture}
\end{document}

結果：