如何在 \tikzmath 模式下绘图？

Question

不知何故，此代码不起作用

\begin{tikzpicture}
\newcommand*{\xMax}{6}
\newcommand*{\yMax}{6}
\tikzmath{
  \k = 0;
  for \i in {0,0.5,...,\xMax} {
    if \i == \xMax then {
      \draw [very thin,gray] (\i,0) -- (\i,\yMax);
    } else {
      \draw [very thin,gray] (\i,0) -- (\i,\yMax) node[below=0.0cm] at ([xshift=0.275cm]\i,0) {$X_{\k}$};
    }
    \k = \k + 1;
  }
  for \i in {0,0.5,...,\yMax} {
      if \i == \yMax then {
        \draw [very thin,gray] (0,\i) -- (\xMax,\i);
      } else {
        \draw [very thin,gray] (0,\i) -- (\xMax,\i) node [left] at ([yshift=0.25cm]0,\i) {$\i$};
      }
  }
}
\end{tikzpicture}

但我还是没能找出原因。您有什么想法吗？

Answer 1

您可以\draw在 内使用和公司tikzmath。相关规则在 部分中有说明。59.7 在解析器外执行代码pgfmanual v3.1.5 的说明：

那么你需要更加小心地使用空格和;。例如​​，在

for \i in {0,0.5,...,\yMax} {

}和之间不能有空格{。此外，每个ifand 循环都需要以 结束;。如果你遵循这些规则，你会得到

\documentclass[tikz,border=3mm]{standalone}
\usetikzlibrary{math}
\begin{document}
\begin{tikzpicture}
\newcommand*{\xMax}{6}
\newcommand*{\yMax}{6}
\tikzmath{real \i;
  int \k;
  \k = 0;
  for \i in {0,0.5,...,\xMax}{
    if \i == \xMax then {
      {\draw [very thin,gray] (\i,0) -- (\i,\yMax);};
    } else {
      {\draw [very thin,gray] (\i,0) -- (\i,\yMax) node[below=0.0cm] at
      ([xshift=0.275cm]\i,0) {$X_{\k}$};};
    };
    \k = \k + 1;
  };
  for \i in {0,0.5,...,\yMax}{
      if \i == \yMax then {
        {\draw [very thin,gray] (0,\i) -- (\xMax,\i);};
      } else {
        {\draw [very thin,gray] (0,\i) -- (\xMax,\i) node [left] at
        ([yshift=0.25cm]0,\i) {$\i$};};
      };
  };
}
\end{tikzpicture}
\end{document}