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我怎样才能用不同的颜色绘制这个圆圈？

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我怎样才能用不同的颜色绘制这个圆圈？

我正在尝试绘制下图，但遇到了一些困难。我编写了以下代码：

\documentclass{article}
\usepackage{xcolor,pict2e}% to allow any radius
\usepackage{tikz}
\begin{document}
\begin{tikzpicture}
\draw[very thick,<->] (-6,0) -- (6,0)node[anchor=north west] {$x$};
\draw (0,0)[red,very thick,dashed] circle (1cm and 1cm);
\draw (0,0) [red,very thick,dashed] circle (2.cm and 2.cm);
 \draw[thick,-] (0.7,0.7) -- (1.4,1.5);
  \draw[thick,-] (-0.7,0.7) -- (-1.4,1.5);
   \draw[thick,-] (0.7,-0.7) -- (1.4,-1.5);
 \draw[thick,-] (-0.7,-0.7) -- (-1.4,-1.5);
\end{tikzpicture}
\end{document}

在此处输入图片描述

答案1

使用时间pic

\documentclass{article}
%\usepackage{xcolor,pict2e}% to allow any radius
\usepackage{tikz}
\tikzset{pics/myarc/.style args={inner #1 and outer #2}{
  code={
    \draw[very thick,dashed, #1] (1,0) arc (0:90:1cm);
    \draw[very thick] (0,1) -- (0,2);
    \draw[very thick,dashed, #2] (0,2) arc (90:0:2cm);
    \draw[very thick] (2,0) -- (1,0);
  }
}}
\begin{document}
\begin{tikzpicture}
\draw[very thick,<->] (-6,0) -- (6,0)node[anchor=north west] {$x$};
\pic [draw,rotate=-45]      {myarc={inner red and outer blue}};
\pic [draw, rotate=45]      {myarc={inner olive and outer magenta}};
\pic [draw, rotate=135]      {myarc={inner blue and outer teal}};
\pic [draw, rotate=225]      {myarc={inner cyan and outer orange}};
\end{tikzpicture}
\end{document}

在此处输入图片描述

带填充：

\documentclass{article}
%\usepackage{xcolor,pict2e}% to allow any radius
\usepackage{tikz}
\tikzset{pics/myarc/.style args={inner #1 and outer #2 with fill #3}{
  code={
    \draw[very thick,dashed, #1] (1,0) arc (0:90:1cm);
    \draw[very thick] (0,1) -- (0,2);
    \draw[very thick,dashed, #2] (0,2) arc (90:0:2cm);
    \draw[very thick] (2,0) -- (1,0);
    \fill[#3] (1,0) arc (0:90:1cm) -- (0,2) arc (90:0:2cm) -- cycle;
  }
}}
\begin{document}
\begin{tikzpicture}
\draw[very thick,<->] (-6,0) -- (6,0)node[anchor=north west] {$x$};
\pic [draw,rotate=-45]      {myarc={inner red and outer blue with fill red!20}};
\pic [draw, rotate=45]      {myarc={inner olive and outer magenta with fill green!20}};
\pic [draw, rotate=135]      {myarc={inner blue and outer teal with fill olive!30}};
\pic [draw, rotate=225]      {myarc={inner cyan and outer orange with fill brown!20}};
\end{tikzpicture}
\end{document}

在此处输入图片描述

现在令人困惑的是，代码和 OP 中的图片不一样。实际上需要什么？

\documentclass{article}
%\usepackage{xcolor,pict2e}% to allow any radius
\usepackage{tikz}
\tikzset{pics/myarc/.style args={#1}{
  code={
    \draw[very thick,#1] (2,0) arc(0:90:2cm);
  }
}}
\begin{document}
\begin{tikzpicture}
\draw[very thick,<->] (-6,0) -- (6,0)node[anchor=north west] {$x$};
\foreach \rot/\col in {-45/green,45/blue,135/red,225/blue}{
\pic [draw,rotate=\rot]      {myarc={\col}};
}
\end{tikzpicture}
\end{document}

在此处输入图片描述

答案2

这不是很优雅，但我认为它给出了你想要的结果：

\documentclass{standalone}
\usepackage{xcolor}
\usepackage{tikz}

\begin{document}
\begin{tikzpicture}
\newcommand\rad{2} % circle radius
\draw[very thick,<->] (-3,0) -- (3,0)node[anchor=north west] {$x$};
% red
\draw[red,thick] (-\rad,0) arc (180:135:\rad);
\draw[red,thick] (-\rad,0) arc (-180:-135:\rad);
% green
\draw[green!50!black,thick] (\rad,0) arc (0:45:\rad);
\draw[green!50!black,thick] (\rad,0) arc (0:-45:\rad);
% blue top
\draw[blue,thick] (0,\rad) arc (90:45:\rad);
\draw[blue,thick] (0,\rad) arc (90:135:\rad);
% blue bottom
\draw[blue,thick] (0,-\rad) arc (-90:-45:\rad);
\draw[blue,thick] (0,-\rad) arc (270:225:\rad);
\end{tikzpicture}

\end{document}

Tikz 圆圈

答案3

由于无法改变线中间的线条颜色，因此需要四个圆弧。

\documentclass{article}
\usepackage{tikz}
\begin{document}
\begin{tikzpicture}
\draw[very thick,<->] (-6,0) -- (6,0)node[anchor=north west] {$x$};

\foreach \i/\j in {-45/green, 45/purple, 135/red, 225/blue}
    \draw[very thick,\j] (\i:2cm) arc [start angle=\i,radius=2cm, delta angle=90];
\end{tikzpicture}
\end{document}

在此处输入图片描述

答案4

并且在元帖子，使用操作和路径上有 8 个“点”subpath的事实。fullcircle

在此处输入图片描述

prologues := 3;
outputtemplate := "%j%c.eps";
beginfig(1);
draw (left--right) scaled 1in withcolor .8 white;
path c; 
c = fullcircle scaled 1in;
draw subpath (1,3) of c withcolor blue+red;
draw subpath (3,5) of c withcolor red;
draw subpath (5,7) of c withcolor blue;
draw subpath (-1,1) of c withcolor green;
for t=0 upto 7: label(decimal t, point t of c scaled 1.2); endfor
endfig;
end.

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