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图下方的线

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图下方的线

在此处输入图片描述

\documentclass[border=6mm]{standalone}
\usepackage    {siunitx}
\usepackage    {tikz}
\usetikzlibrary{angles}
\sisetup       {output-decimal-marker={,}}

\begin{document}
\begin{tikzpicture}[scale=0.3,line join=round]
\def\yb{13}
\def\ac{42} % angle C
\pgfmathsetmacro\x{\yb*tan(\ac)}
\pgfmathsetmacro\h{\yb/cos(\ac)} % hypothenuse
\coordinate [label=below:$\textcolor{white}F$] (A) at (0,0);
\coordinate [label=above:$\textcolor{white}B$](B) at (0,\yb);
\coordinate [label=below:$\textcolor{white}G$](C) at (-\yb,0);
\draw[thick] (A) -- node[right]        {\color{blue} $z$}
                          (B) -- node[sloped,above] {\color{white}hypotenuse = \num{\h}}
                          (C) -- node[sloped,below] {\color{white}\text{opposite} $= FG$} cycle;
                          \draw[thick] (B) -- node[sloped]        {\color{blue}$|$}
                          (C) -- cycle;
\def\yt{13}
\def\ac{42} % angle C
\pgfmathsetmacro\x{\yb*tan(\ac)}
\pgfmathsetmacro\h{\yb/cos(\ac)} % hypothenuse
\coordinate [label=below:$\textcolor{white}F$] (A) at (0,0);
\coordinate [label=above:$\textcolor{white}B$](D) at (0,\yt);
\coordinate [label=below:$\textcolor{white}G$](E) at (\yt,0);
\coordinate [label=below:$\textcolor{white}G$](m) at (\yt,-2cm);
\coordinate [label=below:$\textcolor{white}G$](n) at (-\yt,-2cm);
\coordinate [label=below:$\textcolor{blue}{120}$](H) at (0,-2cm);
\draw[thick] (A) -- node[right]        {\color{blue} $z$}
                          (D) -- node[sloped,above] {\color{white}hypotenuse = \num{\h}}
                          (E) -- node[sloped,below] {\color{blue}$y$} cycle;
                          \draw[thick] (D) -- node[sloped]        {\color{blue}$|$}
                          (E) -- cycle;
\draw[thick](m)--(H)--(n)--cycle;
% angles, with angles library
\draw[thick] pic [draw] {angle=A--C--B} node [above,xshift=.8cm,yshift=0cm] at (C) {\ang{\ac}};
\draw[thick] pic [draw,angle radius=4mm] {right angle=B--A--C};
\end{tikzpicture}
\end{document}

如何将线放在图下方？顺便说一句，不要介意其他代码，我会在需要时使用它。

答案1

为了好玩，这很容易pstricks：

\documentclass{article}
\usepackage{sansmath}
\usepackage[x11names]{xcolor}%
\usepackage{pst-eucl}

\begin{document}

\psset{unit=1.25cm}
\begin{pspicture}(-2,-1)(2,2) \sansmath
\psset{PointSymbol=none, PointName=none, linejoin=1, linewidth=1pt, labelsep=2pt, MarkHashLength=3mm}
\pstTriangle(0,1.8){A}(-2,0){B}(2,0){C}
\pstGeonode(0,0){O}\pcline(A)(O) \naput{$\color{DeepSkyBlue3}z$}\uput[d](1,0){$\color{DeepSkyBlue3}y$}
{\psset{linecolor=Coral2, SegmentSymbol=MarkHash, MarkAngle=90}
\pstRightAngle{A}{O}{B} 
\pstMarkAngle[linestyle=none]{C}{B}{A}{$\color{DeepSkyBlue3}42^{\circ}$}
\pstSegmentMark{A}{B}\pstSegmentMark{A}{C}}
\pstTriangle(0,1.8){A}(-2,0){B}(2,0){O}
\pcline[offset=-15pt, linecolor=DeepSkyBlue3]{|-|}(B)(C)
\ncput*[nrot=:U]{$\color{DeepSkyBlue3}120$}
\end{pspicture}

\end{document}

在此处输入图片描述

答案2

这只是另一种非常接近此类绘图的方法，以便让您知道如何在非水平的情况下绘制这些测量线（并且无需使用任何可以自动执行此操作的花哨库）：

措施

\documentclass[tikz,border=3.14mm]{standalone}
\usetikzlibrary{calc,arrows.meta,quotes,angles}

\tikzset{
    measure/.style = {thin,
            {Bar[width=2.2mm]Latex[]}-%
            {Latex[]Bar[width=2.2mm]},
                }
    }
    
\begin{document}
    \begin{tikzpicture}[thick,font=\sffamily]
        \def\angleI{10} % tilt angle
        \def\angleB{42} % B angle
        \def\a{6}
        
        \pgfmathsetmacro\b{0.5*\a/cos(\angleB)}
        \path   (0,0) coordinate (B) 
                (\angleI:\a) coordinate (C)
                ($(B)+(\angleI+\angleB:\b)$) coordinate (A)
                ($(B)!0.5!(C)$) coordinate (H);
        \draw   (A) node[above]{A} -- (B) node[midway,sloped,red]{\large $|$}  node[left]{B} -- (C) node[near end,above,cyan]{y} node[right]{C} -- (A) node[midway,sloped,red]{\large $|$} -- cycle
                (A) -- (H) node[midway,right,cyan]{z} ;
        \draw[red] pic [draw,angle radius=3mm] {right angle=A--H--B};
        
        \draw[purple] pic [draw] {angle=C--B--A} node [xshift=8mm,yshift=4mm] at (B) {\angleB$^\circ$};
        
        \draw[measure,cyan]  ($(B)!5mm!-90:(C)$) -- ($(C)!5mm! 90:(B)$) node[midway,sloped,fill=white]{120};
    \end{tikzpicture}
\end{document}

答案3

我不知道我是否理解正确了这个问题。但是你想要图形下方的黑线？例如，你可以使用\newcommand{\decoRule}{\rule{\textwidth}{0.6pt}}

\documentclass[border=6mm]{article}
\usepackage    {siunitx}
\usepackage    {tikz}
\usetikzlibrary{angles}
\sisetup       {output-decimal-marker={,}}

\newcommand{\decoRule}{\rule{\textwidth}{0.6pt}}
\begin{document}
    \begin{figure}
        \centering
\begin{tikzpicture}[scale=0.3,line join=round]
\def\yb{13}
\def\ac{42} % angle C
\pgfmathsetmacro\x{\yb*tan(\ac)}
\pgfmathsetmacro\h{\yb/cos(\ac)} % hypothenuse
\coordinate [label=below:$\textcolor{white}F$] (A) at (0,0);
\coordinate [label=above:$\textcolor{white}B$](B) at (0,\yb);
\coordinate [label=below:$\textcolor{white}G$](C) at (-\yb,0);
\draw[thick] (A) -- node[right]        {\color{blue} $z$}
                          (B) -- node[sloped,above] {\color{white}hypotenuse = \num{\h}}
                          (C) -- node[sloped,below] {\color{white}\text{opposite} $= FG$} cycle;
                          \draw[thick] (B) -- node[sloped]        {\color{blue}$|$}
                          (C) -- cycle;
\def\yt{13}
\def\ac{42} % angle C
\pgfmathsetmacro\x{\yb*tan(\ac)}
\pgfmathsetmacro\h{\yb/cos(\ac)} % hypothenuse
\coordinate [label=below:$\textcolor{white}F$] (A) at (0,0);
\coordinate [label=above:$\textcolor{white}B$](D) at (0,\yt);
\coordinate [label=below:$\textcolor{white}G$](E) at (\yt,0);
\coordinate [label=below:$\textcolor{white}G$](m) at (\yt,-2cm);
\coordinate [label=below:$\textcolor{white}G$](n) at (-\yt,-2cm);
\coordinate [label=below:$\textcolor{blue}{120}$](H) at (0,-2cm);
\draw[thick] (A) -- node[right]        {\color{blue} $z$}
                          (D) -- node[sloped,above] {\color{white}hypotenuse = \num{\h}}
                          (E) -- node[sloped,below] {\color{blue}$y$} cycle;
                          \draw[thick] (D) -- node[sloped]        {\color{blue}$|$}
                          (E) -- cycle;
\draw[thick](m)--(H)--(n)--cycle;
% angles, with angles library
\draw[thick] pic [draw] {angle=A--C--B} node [above,xshift=.8cm,yshift=0cm] at (C) {\ang{\ac}};
\draw[thick] pic [draw,angle radius=4mm] {right angle=B--A--C};
\end{tikzpicture}
\decoRule
\caption[a triangle]{A description comes here}\label{triangle}
\end{figure}
\end{document}

在此处输入图片描述

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