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模拟手绘曲线，画一个圈，必要时进行填充

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模拟手绘曲线，画一个圈，必要时进行填充

阅读这个问题：模拟手绘线条按照 Percusse 的想法，我尝试了这个：

在此处输入图片描述 在此处输入图片描述

但是，是否可以在样式命令中“隐藏”多行代码并通过传递参数keys。顺便说一句，对于step0.01 的 a，有 101 个标记，但对于step0.2 的 a，只有 50 个标记，并且该行不会到达末尾？

\documentclass[tikz]{standalone}
\usepackage{}
\usetikzlibrary{decorations.markings}

\begin{document}

\begin{tikzpicture}[decoration={markings,
mark=between positions 0 and 1 step .01 with {
\node at (0,.3pt*rand) [coordinate,
name=mark-\pgfkeysvalueof{/pgf/decoration/mark info/sequence number}]
{};}}]
\draw [help lines] grid (3,2);
\draw [postaction={decorate},help lines] (0,0) -- (3,1) arc (0:180:1.5 and 1);
\draw[smooth] [red] (mark-1)
    \foreach \i in {2,...,101} {-- (mark-\i) } ;
\end{tikzpicture}

\begin{tikzpicture}[decoration={markings,
mark=between positions 0 and 1 step .01 with {
\node at (0,.4pt*rand) [coordinate,
name=mark-\pgfkeysvalueof{/pgf/decoration/mark info/sequence number}]
{};}}]
\draw [help lines] grid (3,2);
\path [postaction={decorate}] (0,0) -- (3,1) arc (0:180:1.5 and 1) -- cycle ;
\draw[smooth,red,fill=red!15] (mark-1)
    \foreach \i in {2,...,101} {-- (mark-\i) } ;
\end{tikzpicture}

\end{document}

答案1

这是满足您要求的一种方法。可能不是最好的。

\documentclass[tikz]{standalone}
\usetikzlibrary{decorations.markings}
\tikzset{%
  hand drawn/random interval/.initial = 1pt,
  hand drawn/step/.initial = 0.05,
  hand drawn with markings/.style = {%
   decoration={%
    markings,
    mark = between positions 0 and 1 step \pgfkeysvalueof{/tikz/hand drawn/step} with {%
      \edef\SequenceNumber{%
        \pgfkeysvalueof{/pgf/decoration/mark info/sequence number}}%
      \coordinate (mark-\SequenceNumber) at
      (0,\pgfkeysvalueof{/tikz/hand drawn/random interval}*rand);
      \ifnum\SequenceNumber>1\relax
      \draw[#1] (mark-\number\numexpr\SequenceNumber-1\relax) 
        -- 
        (mark-\SequenceNumber);
      \fi},
    },
    decorate},
}
\begin{document}

\begin{tikzpicture}
  \draw [help lines] grid (3,2);
  \draw [hand drawn with markings = {red}] (0,0) -- (3,1) arc (0:180:1.5 and 1);
\end{tikzpicture}

\end{document}

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