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画一个“手绘”圆圈（某种程度上）

tag-icon • tag-icon tikz-pgf
画一个“手绘”圆圈（某种程度上）

我想要一种更好的方法来绘制近似手绘圆圈的东西tikz：

\documentclass{article}
\pagestyle{empty}
\usepackage{tikz}
\usetikzlibrary{calc}
\begin{document}

\begin{tikzpicture}

  \coordinate (A) at (0,0);
  \coordinate (C) at (2in, 0);
  \coordinate (B) at ($(C)!1in!-90:(A)$);

  \draw (A) -- (C) -- (B) -- cycle;

  \coordinate (A/u) at ($(A) + (30:1em)$);
  \coordinate (A/d) at ($(A) + (-10:1em)$);
  \coordinate (A/x) at ($(A) + (120:2em)$);
  \coordinate (A/y) at ($(A) + (-120:2em)$);

  \draw[line width=1pt] (A/d) .. controls (A/x) and (A/y) .. (A/u);

\end{tikzpicture}

\end{document}

在此处输入图片描述

我知道模拟手绘线条。虽然摇摆的效果很好，但我还是想得到一些接近圆形但两端不太相接的东西。

答案1

在...的帮助下模拟手绘线条，似乎可以得到更好的结果（红色的对于这种特殊的应用，使用方形和打击乐的decoration=penciline，以及使用 Alain Matthes 的 ，圆形效果会更好\freedraw：

在此处输入图片描述

代码：

\documentclass{article}
\pagestyle{empty}
\usepackage{tikz}
\usetikzlibrary{calc,decorations.pathmorphing,patterns,shapes}

%% https://tex.stackexchange.com/questions/39296/simulating-hand-drawn-lines: percusse
\pgfdeclaredecoration{penciline}{initial}{
    \state{initial}[width=+\pgfdecoratedinputsegmentremainingdistance,auto corner on length=1mm,]{
        \pgfpathcurveto%
        {% From
            \pgfqpoint{\pgfdecoratedinputsegmentremainingdistance}
                            {\pgfdecorationsegmentamplitude}
        }
        {%  Control 1
        \pgfmathrand
        \pgfpointadd{\pgfqpoint{\pgfdecoratedinputsegmentremainingdistance}{0pt}}
                        {\pgfqpoint{-\pgfdecorationsegmentaspect\pgfdecoratedinputsegmentremainingdistance}%
                                        {\pgfmathresult\pgfdecorationsegmentamplitude}
                        }
        }
        {%TO 
        \pgfpointadd{\pgfpointdecoratedinputsegmentlast}{\pgfpoint{0.5pt}{1.5pt}}
        }
    }
    \state{final}{}
}

%% https://tex.stackexchange.com/questions/39296/simulating-hand-drawn-lines: Alain Matthes
\pgfdeclaredecoration{free hand}{start}
{
  \state{start}[width = +0pt,
                next state=step,
                persistent precomputation = \pgfdecoratepathhascornerstrue]{}
  \state{step}[auto end on length    = 3pt,
               auto corner on length = 3pt,               
               width=+2pt]
  {
    \pgfpathlineto{
      \pgfpointadd
      {\pgfpoint{2pt}{0pt}}
      {\pgfpoint{rand*0.15pt}{rand*0.15pt}}
    }
  }
  \state{final}
  {}
}
 \tikzset{free hand/.style={
    decorate,
    decoration={free hand}
    }
 } 
\def\freedraw#1;{\draw[free hand] #1;}



\begin{document}

\begin{tikzpicture}
    \coordinate (A) at (0,0);
    \coordinate (C) at (1in, 0);
    \coordinate (B) at ($(C)!1in!-90:(A)$);

    \draw (A) -- (C) -- (B) -- cycle;

    \coordinate (A/u) at ($(A) + (30:1em)$);
    \coordinate (A/d) at ($(A) + (-10:1em)$);
    \coordinate (A/x) at ($(A) + (120:2em)$);
    \coordinate (A/y) at ($(A) + (-120:2em)$);

    \begin{scope}[decoration=penciline]
        \draw[thick, fill=blue!25, fill opacity=.25, draw=red, decorate] ($(A)+(-0.1cm,-0.1cm)$)  rectangle (0.1cm,0.2cm); 
        \draw[thick, draw=brown, radius=0.1cm, decorate] (B)  circle (0.15cm); 
        \draw[thick, draw=blue, x radius=0.15cm, y radius=0.19cm, rotate=30, shape=circle, decorate,] (C) circle {}; 
        \node [above left] at (B) {decoration=penciline};
    \end{scope}
\end{tikzpicture}
\hspace*{0.3cm}
\begin{tikzpicture}
    \coordinate (A) at (0,0);
    \coordinate (C) at (1in, 0);
    \coordinate (B) at ($(C)!1in!-90:(A)$);

    \draw (A) -- (C) -- (B) -- cycle;

    \coordinate (A/u) at ($(A) + (30:1em)$);
    \coordinate (A/d) at ($(A) + (-10:1em)$);
    \coordinate (A/x) at ($(A) + (120:2em)$);
    \coordinate (A/y) at ($(A) + (-120:2em)$);

    \freedraw[thick, draw=blue] ($(A)+(-0.1cm,-0.1cm)$)  rectangle (0.15cm,0.2cm); 
    \freedraw[thick, fill=blue!25, fill opacity=.25, draw=red] (B) circle [radius=0.2cm]; 
    \freedraw[thick, fill=blue!25, fill opacity=.25, draw=red, x radius=0.15cm, y radius=0.19cm, rotate=30, shape=circle,] (C) circle {}; 
    \node [above left] at (B) {\textbackslash freedraw};
\end{tikzpicture}

\end{document}

答案2

我不知道如何驾驶tikz，所以如果语法不规范，请原谅。但我所做的是采取\mathcal{O}并以用户可定义的方式拉伸和旋转它：

\documentclass{article}
\pagestyle{empty}
\usepackage{tikz}
\usetikzlibrary{calc}
\newcommand\handoh[3][0]{%
\scalebox{#2}[#3]{\raisebox{1pt}{\kern3pt\rotatebox{#1}{%
  \kern-4.5pt\raisebox{-2pt}{$\mathcal{O}$}\kern-4pt}}\kern2pt}%
}
\begin{document}
\begin{tikzpicture}

  \coordinate (A) at (0,0);
  \coordinate (C) at (2in, 0);
  \coordinate (B) at ($(C)!1in!-90:(A)$);

  \draw (A) -- (C) -- (B) -- cycle;

  \coordinate (A/u) at ($(A) + (30:1em)$);
  \coordinate (A/d) at ($(A) + (-10:1em)$);
  \coordinate (A/x) at ($(A) + (120:2em)$);
  \coordinate (A/y) at ($(A) + (-120:2em)$);


\node (D) [label=left:{\textbackslash handoh[160]\{2.5\}\{3\}}] 
  at (A) {\handoh[160]{2.5}{3}};

\node (E) [label=left:{\textbackslash handoh[45]\{1.3\}\{1.7\}}] 
  at (B) {\handoh[45]{1.3}{1.7}};

\node (F) [label=below:{\textbackslash handoh[-70]\{2.5\}\{1.5\}}] 
  at (C) {\handoh[-70]{2.5}{1.5}};
\end{tikzpicture}
\end{document}

在此处输入图片描述

答案3

如果圆的另一侧没有另一个中点，则很难获得您想要的真正圆形。此 MWE 添加了另一个中点，并稍微调整了控制点，以获得略带圆形、略带不规则的形状。

事实上，虽然“摇摆”效果对于较直的线段来说很好，但大多数时候我发现小圆圈是相当平滑的线条，通常是椭圆形的......

梅威瑟：

\documentclass{article}
\pagestyle{empty}
\usepackage{tikz}
\usetikzlibrary{calc}
\begin{document}

\begin{tikzpicture}

  \coordinate (A) at (0,0);
  \coordinate (C) at (2in, 0);
  \coordinate (B) at ($(C)!1in!-90:(A)$);

  \draw (A) -- (C) -- (B) -- cycle;

  \coordinate (A/u) at ($(A) + (40:.8em)$);
  \coordinate (A/d) at ($(A) + (-20:1.1em)$);
  \coordinate (A/l) at ($(A) + (180:.7em)$);
  \coordinate (A/x) at ($(A) + (50:1em)$);
  \coordinate (A/y) at ($(A) + (120:1.2em)$);
  \coordinate (A/v) at ($(A) + (-120:1.6em)$);
  \coordinate (A/w) at ($(A) + (-30:1.8em)$);

  \draw[line width=1pt] (A/d) .. controls (A/x) and (A/y) .. (A/l) .. controls (A/v) and (A/w) .. (A/u);

\end{tikzpicture}

\end{document}

给出：

圆形 三角形

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