阴影扇形

Question

这是一些径向阴影。在这个非常好的答案。但是，即使我调整了参数，也无法使中间颜色非常明显。好吧，我只能说，这个漂亮阴影的作者留下了一个问题“后来——阴影被假定为 100bp 直径？？”。如果她不知道，可怜的土拨鼠怎么会知道，特别是在冬眠的时候？我复制了代码，以便您或其他人可以玩它。

幸运的是，你希望中间颜色是白色，所以我可以使用 B 方案，在本例中即路径淡入淡出。这就是我的建议。

\documentclass[tikz]{standalone}
\makeatletter
% from https://tex.stackexchange.com/a/127045/121799
\tikzset{use path/.code=\tikz@addmode{\pgfsyssoftpath@setcurrentpath#1}}
\makeatother
\usetikzlibrary{calc,shapes.geometric,backgrounds,fadings}
\tikzfading[name=fade in,
inner color=transparent!100,
outer color=transparent!0]

\pgfdeclareradialshading[fradialcolour1,fradialcolour2,fradialcolour3]{fncyradial}{\pgfpoint{0}{0}}{% manual 1082-1083; later - shading is assumed to be 100bp diameter ??
  color(0)=(fradialcolour1);
  color(20bp)=(fradialcolour2);
  color(40bp)=(fradialcolour3);
  color(50bp)=(fradialcolour3)
}
\tikzset{% https://tex.stackexchange.com/a/372682/121799
  fradial/.code={%
        \tikzset{%
          fancy radial/.cd,
          shading=fncyradial,
          #1
        }
  },
  fancy radial/.search also={/tikz},
  fancy radial/.cd,
  fancy radial inner colour/.code={
        \colorlet{fradialcolour1}{#1}
  },
  fancy radial mid colour/.code={
        \colorlet{fradialcolour2}{#1}
  },
  fancy radial outer colour/.code={
        \colorlet{fradialcolour3}{#1}
  },
  fancy radial inner colour=black,
  fancy radial outer colour=black,
  fancy radial mid colour=white,
  inner color/.style={
        fancy radial inner colour=#1,
  },
  outer color/.style={
        fancy radial outer colour=#1,
  },
  mid color/.style={
        fancy radial mid colour=#1,
  },
}
\begin{document}  
\begin{tikzpicture}[scale=0.5,
                    transform shape
                   ] 

\tikzset{shape circlesec/.style={
                                 draw,
                                 line width=0.1pt,
                                 inner xsep=0pt,
                                 inner ysep=0pt,
    } 
}%end tikzset


       \node [name=maerz,save path=\pathA,
       shape=circular sector, 
       style=shape circlesec,
       inner sep=0cm,
       circular sector angle=30,
       shape border uses incircle,
       shape border rotate=-165,
       anchor=sector center,inner sep=-2mm,%
       minimum size = 6.6cm,%has an effect if the original size was smaller
       %shading angle=15,
      ] 
   (maerz) at (0,0) {};
   \begin{scope}[on background layer]
   \clip[use path=\pathA];
   \shade[inner color=green,outer color=red,path fading=fade in] let 
   \p1=($(maerz.arc center)-(maerz.sector center)$),\n1={veclen(\y1,\x1)}
   in (maerz.sector center) circle (\n1);
   \end{scope}
   \foreach \anchor/\placement in
      {arc center/right, sector center/below left}
      \draw[shift=(maerz.\anchor)] plot[mark=x] coordinates{(0,0)}
         node[\placement] {\scriptsize\texttt{(maerz.\anchor)}};

   \draw let \p1=($(maerz.north)-(maerz.sector center)$),\n1={int(1+\y1*1pt/1cm)}%
      in
      \pgfextra{\pgfmathtruncatemacro{\xmax}{\n1}
                \pgfmathtruncatemacro{\nextx}{\xmax-1}
               }%end pgfextra code
      foreach \x in {-\xmax,-\nextx,...,\xmax}
         {(\x,1pt) -- (\x,-1pt) node[anchor=north,font=\tiny]{ $\x$} } 
      foreach \y in {-\xmax,-\nextx,...,\xmax}
         {(1pt,\y) -- (-1pt,\y) node[anchor=east,font=\tiny]{($\y$)}};

\end{tikzpicture} 
\end{document}

当然，您可以通过\tikzfading[name=fade out,inner color=transparent!0,outer color=transparent!100]从 pgfmanual 第 344 页叠加来添加另一种颜色。

旧答案：使用阴影时，讽刺的是，它middle color必须放在最后，而不是中间。

\documentclass[]{standalone}
\usepackage{tikz}
\usetikzlibrary{calc,shapes.geometric}

\begin{document}  
\begin{tikzpicture}[scale=0.5,
                    transform shape
                   ] 

\tikzset{shape circlesec/.style={bottom color=red,
                                 top color=white,
                                 middle color=green,
                                 shade,
                                 shading=axis,
                                 shading angle=180,
                                 draw,
                                 %fill=yellow!30,
                                 line width=0.1pt,
                                 inner xsep=0pt,
                                 inner ysep=0pt,
    } 
}%end tikzset


       \node [name=maerz,
       shape=circular sector, 
       style=shape circlesec,
       inner sep=0cm,
       circular sector angle=30,
       shape border uses incircle,
       shape border rotate=-165,
       anchor=sector center,inner sep=-2mm,%
       minimum size = 6.6cm,%has an effect if the original size was smaller
       shading angle=60,
      ] 
   (maerz) at (0,0) {};

   %\draw[top color=white,bottom color=black,middle color=violet]%
   %   (maerz.arc center) circular sector  (maerz.sector center);

   \foreach \anchor/\placement in
      {arc center/right, sector center/below left}
      \draw[shift=(maerz.\anchor)] plot[mark=x] coordinates{(0,0)}
         node[\placement] {\scriptsize\texttt{(maerz.\anchor)}};

   \draw let \p1=($(maerz.north)-(maerz.sector center)$),\n1={int(1+\y1*1pt/1cm)}%
      in
      \pgfextra{\pgfmathtruncatemacro{\xmax}{\n1}
                \pgfmathtruncatemacro{\nextx}{\xmax-1}
               }%end pgfextra code
      foreach \x in {-\xmax,-\nextx,...,\xmax}
         {(\x,1pt) -- (\x,-1pt) node[anchor=north,font=\tiny]{ $\x$} } 
      foreach \y in {-\xmax,-\nextx,...,\xmax}
         {(1pt,\y) -- (-1pt,\y) node[anchor=east,font=\tiny]{($\y$)}};

\end{tikzpicture} 
\end{document}

当使用您的代码时，我发现这些形状具有抵抗的意外行为fit......

Answer 1