![如何从图片内的锚节点绘制线段?](https://linux22.com/image/429218/%E5%A6%82%E4%BD%95%E4%BB%8E%E5%9B%BE%E7%89%87%E5%86%85%E7%9A%84%E9%94%9A%E8%8A%82%E7%82%B9%E7%BB%98%E5%88%B6%E7%BA%BF%E6%AE%B5%EF%BC%9F.png)
我试图从可配置对象(构造为 TikZ 图片)内的锚节点绘制一条线,但不起作用。对此有解释和解决方案吗?
\documentclass[10pt]{standalone}
\usepackage[siunitx,american, RPvoltages]{circuitikz}
\begin{document}
% --- Manômetro ---------------------
\tikzset{pics/manometer/.style={code={
\tikzset{manometer/.cd,#1}
\def\pv##1{\pgfkeysvalueof{/tikz/manometer/##1}}% local object variable
%------------------------------
%--- case
\filldraw [thin,fill=\pv{case color}, opacity=0.95] (0,0) circle (2.05cm);
\draw [semithick, white,opacity=0.95] (0,0) circle (1.85cm);
% --- Tubo de Bourdon interno
\pv{bourdon}[double=white, line width=0.5pt,double distance=2mm,opacity=0.95, rounded corners, cap=round] (-90:1.95) --++(90:0.5) arc(270:20:1.4cm) coordinate(ptb);
\pv{bourdon}(ptb) -- (0,0);
\filldraw[black,thin,fill=white, opacity=0.9] (0,0) circle (1.8cm);
% --- pressure port node for an external reference
\node (-port) at (0,-1.78){} ;
%--- escala
\foreach \angle / \label in
{225/0, 200/10, 175/20, 150/30, 125/40, 100/50, 75/60, 50/70, 25/80, 0/90,-25/100 }
{
\draw[line width=1pt] (\angle:1.6cm) -- (\angle:1.8cm);
\draw (\angle:1.3cm) node{\textsf{\label}};
}
\draw (-90:0.75cm) node{\SI{}{\kilo\pascal}}; % unidade
\foreach \angle in {225,222.5, ..., -25} {\draw[thin] (\angle:1.7cm) -- (\angle:1.8cm);}
\foreach \angle in {225,212.5, ..., -25} {\draw[thin] (\angle:1.65cm) -- (\angle:1.8cm);}
\draw[circle,ultra thick,-latex] (0,0) to[short,*-](225-\pv{value}*2.5:1.1cm); % Valor indicado
\draw[fill=black,rounded corners] (0,0) -- (225-\pv{value}*2.5-30:-5mm) -- +(225-\pv{value}*2.5-90:5mm) -- cycle;
\node[draw,circle, fill=gray!10, opacity=0.85] at(0,0){};
}
}, % end of code
manometer/.cd,
value/.initial=30,
case color/.initial=cyan!60!gray,
port color/.initial=green!30!black,
pressure port/.initial=\draw, %\path % to hide pressure port
bourdon/.initial=\draw, %\path % to hide bourdon tube
} % End of Manometer
\begin{tikzpicture}
% defining a pic with name P01
% The problem is that the connection port is outside of the object.
\pic [local bounding box=P01] at (0,0) {manometer={value=50, port color=olive!50!gray, pressure port=\draw, bourdon=\path}};
\draw[color=green!50!black, double=cyan!1, line width=2mm, double distance=1mm, opacity=0.95, rounded corners] (P01.-90) --++(0,-1) --++(-2,0) ;
%--- Following is the desired method using an internal node reference to connect the object but the following error occurs:
% Package pgf Error: No shape named `pgfcirc@short2122start' is known. ...gray, pressure port=\draw, bourdon=\path}}
\pic (P02) at (5,0) {manometer={value=50, pressure port=\draw, bourdon=\draw}};
\draw[color=green!50!black, double=cyan!1, line width=2mm, double distance=1mm, opacity=0.95, rounded corners] (P02-port) --++(0,-1) --++(2,0) ;
\end{tikzpicture}%
\end{document}
答案1
避免使用circuitikz
tikz 图片内的元素。这是一个相当简单的示例,会产生与原始代码类似的错误。
\documentclass{standalone}
\usepackage{circuitikz}
\tikzset{pics/mypic/.style={code={\draw (0,0) to[short](1,0);}}}
\begin{document}
\begin{tikzpicture}
\pic (p) {mypic};
\end{tikzpicture}
\end{document}
问题的根源似乎是节点的命名。如果您不命名的具体实例mypic
,即删除(p)
,则错误会消失。
作为替代方案,使用纯 tikz 并使用 tikz 命令绘制压力计指针。这应该不会比circuitikz
在非预期情况下使用元素更困难。