使用预定义形状的扇形

Question

我正在尝试使用形状“圆形扇区”pgfman301a，p.706。

1. 我发现没有办法改变轴的长度（应该是圆尺寸的变量）。
2. 将“顶点”定位在 0,0
3. 为什么“最小尺寸”不起作用？

代码：

\documentclass[]{scrartcl}
\usepackage[utf8]{inputenc} \usepackage[T1]{fontenc} \usepackage{lmodern}
\usepackage[ngerman]{babel} \usepackage[margin=0cm,a4paper]{geometry}
\usepackage[a4,frame,center]{crop}
\usepackage{tikz}
\usetikzlibrary{mindmap,%to get annotations
          decorations.fractals,
          decorations.pathmorphing,
          decorations.text,
          positioning,
          fadings,lindenmayersystems,shadings,calendar,spy,math,calc,
          shapes.geometric,
          intersections,
          shadows,
          fadings,backgrounds}
\begin{document}  
\begin{tikzpicture} 
   \coordinate (circleorig) at (0cm,0cm); 
   \newdimen\circledim
 \tikzmath{ \circledim=8 cm; }%end tikzmath
 \tikzset{shape circlesec/.style={bottom color=black!30,
                                  top color=red,
                                  draw,
                                  fill=yellow!30,
                                  line width=0.1pt,
                                  inner xsep=0pt,
                                  inner ysep=0pt,
                                 } 
          }%end tikzset
%help lines
%\draw [help lines,step=0.5cm] (0,5) grid (8,-8);
\foreach \x in {-8,-7.5,...,8}
  \draw [yshift=0 cm](\x,1pt) -- (\x,-1pt) node[anchor=north]{\tiny $\x$};
\foreach \y in {-8,-7.5,...,8}
  \draw [yshift=0 cm](1pt,\y) -- (-1pt,\y) node[anchor=east]{\tiny $\y$};
\node [name=j,
      shape=circular sector, 
            style=shape circlesec,
            inner sep=0cm,
            circular sector angle=30,
            shape border uses incircle,
            shape border rotate=-105,
            %minimum size = 10cm,%has no effect?
     ] 
     %at (sector center) 
     {\fbox{\begin{minipage}{3.5cm}
               Januar: Bildung\\
               der ersten silikaten\\
               Erdrinde bald nach \\
               dem prim\"aren,\\
               dissonanten Akt.
            \end{minipage}}
     }; 
    %\draw[shift=(j.south)] plot[mark=x] coordinates{(0,0)}  
    %   node[right] {j.south};
\end{tikzpicture} 
\end{document}

Answer 1

Kpym 已经告诉了你我要告诉你的关于 的内容minimum size。除此之外，你需要使用适当的锚点，并且只知道绘制节点后节点的大小，这样你就可以随后在 上绘制其下方的网格background layer。

\documentclass[tikz,border=3.14mm]{standalone}
\usetikzlibrary{math,calc,shapes.geometric,backgrounds}
\begin{document}  
\begin{tikzpicture}[scale=0.5,transform shape] 
   \coordinate (circleorig) at (0cm,0cm); 
   \newdimen\circledim
 \tikzmath{ \circledim=8 cm; }%end tikzmath
 \tikzset{shape circlesec/.style={bottom color=black!30,
                                  top color=red,
                                  draw,
                                  fill=yellow!30,
                                  line width=0.1pt,
                                  inner xsep=0pt,
                                  inner ysep=0pt,
                                 } 
          }%end tikzset
\node [name=j,
      shape=circular sector, 
            style=shape circlesec,
            inner sep=0cm,
            circular sector angle=30,
            shape border uses incircle,
            shape border rotate=-105,
            anchor=sector center,inner sep=-2mm,
            %minimum size = 20cm,%has an effect if the original size was smaller
     ] 
     (cs) at (0,0) 
     {\fbox{\begin{minipage}{3.5cm}
               Januar: Bildung\\
               der ersten silikaten\\
               Erdrinde bald nach \\
               dem prim\"aren,\\
               dissonanten Akt.
            \end{minipage}}
     }; 
\begin{scope}[on background layer]
%help lines
%\draw [help lines,step=0.5cm] (0,5) grid (8,-8);
\draw let \p1=($(cs.north)-(cs.sector center)$),\n1={int(1+\y1*1pt/1cm)}
in
\pgfextra{\pgfmathtruncatemacro{\xmax}{\n1}\pgfmathtruncatemacro{\nextx}{\xmax-1}\typeout{\n1}}
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{scope}

    %\draw[shift=(j.south)] plot[mark=x] coordinates{(0,0)}  
    %   node[right] {j.south};
\end{tikzpicture} 
\end{document}