矢印付きの対称棒

Question

下図のように、x軸に対して指定された長さと角度を持つ 2 本の棒と、原点の円が示されたプロットを作成したいと考えています。また、原点に 2 つの矢印が表示されています。この概略図をプロットできれば、Tikz宿題のいくつかの問題を非常に絵のようなスタイルで提供できるようになります。

Answer 1

これらは特に複雑なものではありませんdimline。ここsiunitx寸法と角度を入力するために使用できます。

\documentclass[tikz,border=3.14mm]{standalone}
\usetikzlibrary{calc,decorations.pathreplacing,angles,quotes}
\newif\ifdrawdimlineleft
\newif\ifdrawdimlineright
\tikzset{dimlabel distance/.initial=5mm,
vertical lines extend/.initial=5mm,
vertical dim line/.style={gray,thin},
dim arrow line/.style={latex-latex,thin},
dim label/.style={},
left dimline/.is if=drawdimlineleft,
left dimline=true,
right dimline/.is if=drawdimlineright,
right dimline=true,
indicate dimensions/.style={decorate,decoration={
show path construction,
lineto code={
\draw[dim arrow line]
    ($ (\tikzinputsegmentfirst)!\pgfkeysvalueof{/tikz/dimlabel distance}!-90:(\tikzinputsegmentlast) $) -- ($ (\tikzinputsegmentlast)!\pgfkeysvalueof{/tikz/dimlabel distance}!90:(\tikzinputsegmentfirst) $)
 \ifx#1\empty
 \else
 node[midway,sloped,fill=white,dim label]{#1}
 \fi;
\ifdrawdimlineleft
\draw[vertical dim line] (\tikzinputsegmentfirst) -- 
($ (\tikzinputsegmentfirst)!\pgfkeysvalueof{/tikz/vertical lines
extend}!-90:(\tikzinputsegmentlast) $);
\fi
\ifdrawdimlineright
\draw[vertical dim line]    (\tikzinputsegmentlast) -- 
    ($ (\tikzinputsegmentlast)!\pgfkeysvalueof{/tikz/vertical lines extend}!90:(\tikzinputsegmentfirst) $); 
\fi 
}}}}
\begin{document}
\begin{tikzpicture}
 \draw[thick,-stealth] (-5,0) -- (5,0) coordinate(x) node[below]{$\mu$};
 \draw[thick,-stealth] (0,-5) -- (0,3) node[left]{$y$};
  \draw[dashed] (-30:3) coordinate(A) -- (0,0) coordinate(O) ;
 \draw[dashed,postaction={indicate dimensions={$L_1=2.5\,$m},
        dim arrow line/.append style={solid}}]  (O) -- (-120:2.5) coordinate(B);
 \draw[thick]  (A) -- ++(-30:3);
 \draw[thick,postaction={indicate dimensions={$L_2=3\,$m},
        dim arrow line/.append style={solid}}]  (B) -- ++ (-120:3);
 \draw[thick,red,-stealth] (O) -- (60:1.5);
 \draw[thick,red,-stealth] (O) -- (150:1.5);
 \pic [draw,green!60!black,angle radius=1cm,angle eccentricity=1.4,
 "$30^\circ$"] {angle = A--O--x};
\end{tikzpicture}  
\end{document}

ここで全体をスコープ内で回転させる方が合理的かもしれません。

\documentclass[tikz,border=3.14mm]{standalone}
\usetikzlibrary{calc,decorations.pathreplacing,angles,quotes}
\newif\ifdrawdimlineleft
\newif\ifdrawdimlineright
\tikzset{dimlabel distance/.initial=5mm,
vertical lines extend/.initial=5mm,
vertical dim line/.style={gray,thin},
dim arrow line/.style={latex-latex,thin},
dim label/.style={},
left dimline/.is if=drawdimlineleft,
left dimline=true,
right dimline/.is if=drawdimlineright,
right dimline=true,
indicate dimensions/.style={decorate,decoration={
show path construction,
lineto code={
\draw[dim arrow line]
    ($ (\tikzinputsegmentfirst)!\pgfkeysvalueof{/tikz/dimlabel distance}!-90:(\tikzinputsegmentlast) $) -- ($ (\tikzinputsegmentlast)!\pgfkeysvalueof{/tikz/dimlabel distance}!90:(\tikzinputsegmentfirst) $)
 \ifx#1\empty
 \else
 node[midway,sloped,fill=white,dim label]{#1}
 \fi;
\ifdrawdimlineleft
\draw[vertical dim line] (\tikzinputsegmentfirst) -- 
($ (\tikzinputsegmentfirst)!\pgfkeysvalueof{/tikz/vertical lines
extend}!-90:(\tikzinputsegmentlast) $);
\fi
\ifdrawdimlineright
\draw[vertical dim line]    (\tikzinputsegmentlast) -- 
    ($ (\tikzinputsegmentlast)!\pgfkeysvalueof{/tikz/vertical lines extend}!90:(\tikzinputsegmentfirst) $); 
\fi 
}}}}
\begin{document}
\foreach \X in {30,33,...,60,57,54,...,33}
{\begin{tikzpicture}
 \draw[thick,-stealth] (-5.5,0) -- (5,0) coordinate(x) node[below]{$\mu$};
 \draw[thick,-stealth] (0,-6.5) coordinate (my) -- (0,3) node[left]{$y$};
  \pgfmathsetmacro{\myangle}{\X}
  \begin{scope}[rotate=-\myangle]
   \draw[dashed] (2.5,0) coordinate(A) -- (0,0) coordinate(O);
   \draw[dashed,postaction={indicate dimensions={$L_1=2.5\,$m},
          dim arrow line/.append style={solid}}]  (O) -- (0,-2.5) coordinate(B);
   \draw[thick]  (A) -- ++(2.5,0);
   \draw[thick,postaction={indicate dimensions={$L_2=3\,$m},
          dim arrow line/.append style={solid}}]  (B) -- ++ (0,-3);
   \draw[thick,red,stealth-stealth] (-1.5,0) -- (O) -- (0,1.5);
   \pic [draw,green!60!black,angle radius=1cm,angle eccentricity=1.4,
   "$\pgfmathprintnumber{\myangle}^\circ$"] {angle = A--O--x};
   \pic [draw,green!60!black,angle radius=1cm,angle eccentricity=1.4,
   "$\pgfmathparse{90-\myangle}\pgfmathprintnumber{\pgfmathresult}^\circ$"] {angle = my--O--A};
  \end{scope}
\end{tikzpicture}}  
\end{document}