在 \path plot coordinates {} 列表中使用宏

Question

我正在尝试创建一个函数，该函数可生成具有连续曲率的边界的斑点。只要我将各个坐标传递给该函数，一切就会顺利进行。

\documentclass{article}
\usepackage{tikz}

\newcommand{\smoothplot}[3]{%
% Smooth curve through 3 coordinates
  \path [draw=red, line width = 5, smooth cycle] 
    plot coordinates {(#1) (#2) (#3)};
}

\begin{document}
\begin{tikzpicture}
    \coordinate (A) at (0,0);
    \coordinate (B) at (5,5);
    \coordinate (C) at (2,-2);
    \smoothplot{A}{B}{C};
\end{tikzpicture}
\end{document}

但是如果我想通过传递坐标列表来获得任意数量的参数，我就无法让它工作。

\documentclass{article}
\usepackage{tikz}

\newcommand{\smoothplot}[1]{%
% Smooth curve through coordinates given in a list
  \path [draw=red, line width = 5, smooth cycle] 
    plot coordinates {\foreach \mycoord in #1 {(\mycord)}};
}

\begin{document}
\begin{tikzpicture}
    \coordinate (A) at (0,0);
    \coordinate (B) at (5,5);
    \coordinate (C) at (2,-2);
    \smoothplot{A, B, C};
\end{tikzpicture}
\end{document}

它给了我一个错误：Package tikz Error: Cannot parse this coordinate.

有人能告诉我如何从列表中提取坐标以便操作plot可以使用它们吗？

Answer 1

这可以通过 来完成samples at。

\documentclass{article}
\usepackage{tikz}
\begin{document}
\newcommand{\smoothplot}[1]{
\draw[red,line width=5] plot[smooth cycle,variable=\x,samples at={#1}] (\x);}
\begin{tikzpicture}
    \coordinate (A) at (0,0);
    \coordinate (B) at (5,5);
    \coordinate (C) at (2,-2);
    %\draw[red,line width=5] plot[smooth cycle,variable=\x,samples at={A,B,C}] (\x);
    \smoothplot{A,B,C}
\end{tikzpicture}
\end{document}