石拱桥

Question

我想用 TikZ 重现以下内容，但无法做到。我认为第一个很容易，但我无法搭建桥梁……请帮忙。

\begin{tikzpicture}
\draw (0,0) -- (0.2,0.2) -- (0.4,0) -- (0.2,-0.2) -- cycle;
\end{tikzpicture}

Answer 1

数学和角度。

您可以使用scale键或x和y键来改变拱门的大小。

代码

\documentclass[tikz]{standalone}
\begin{document}
\begin{tikzpicture}
\newcommand*\myAng   {7.5}
\newcommand*\myArches{5} % starting with 0
\coordinate (@);
\foreach[evaluate={\c=\i/\myArches*100;}] \i in {0,...,\myArches}
  \draw[rotate=-(\i-(\myArches-1)/2)*2*\myAng+\myAng, fill=red!\c!blue!50]
    (@) -- +(90+\myAng:1)
        -- +([shift=(90-\myAng:1)]right:1)
        -- +(right:1) coordinate (@)
        -- cycle;

\draw[rotate= (\myArches+1)*\myAng]          (0, -0.2)     rectangle +(-1.4, 1.4);
\draw[rotate=-(\myArches+1)*\myAng] ([shift={(0, -0.2)}]@) rectangle +( 1.4, 1.4);
\end{tikzpicture}
\end{document}

输出

Answer 2

您可以使用双线来绘制桥梁，并用垂直线装饰它以模仿石头：

\documentclass{standalone}

\usepackage{tikz}
\usetikzlibrary{decorations.pathreplacing}

\begin{document}

\begin{tikzpicture}[decoration=ticks]
  \draw [double distance=1.7mm] (0,0) arc [start angle=30, end angle=151, radius=2cm];
  \draw [decorate] (0,0) arc [start angle=30, end angle=151, radius=2cm];
\end{tikzpicture}

\end{document}

Answer 3

可以使用trapezium形状链。这样做的好处是，各个角点等都可以作为节点锚点供以后使用。

\documentclass[tikz,border=2mm]{standalone}
\usetikzlibrary{shapes.geometric}
\begin{document}
\begin{tikzpicture}[declare function={alpha=40;% opening angle of the bridge 
    n=6;% number of inner bricks
    w=1;% brick height
    beta=alpha/n;% auxiliary angle
},line join=round]
 \pgfmathtruncatemacro{\myn}{n}   
 \path coordinate (tmp) node[anchor=south east,shift={(alpha-90:w*0.1cm)},minimum size=w*1.2cm,rectangle,draw,rotate=alpha](L){}
 foreach \i in {1,...,\myn}
 {node[trapezium,draw,outer sep=0pt,trapezium angle={-90+beta},minimum height=1cm,anchor=bottom left corner,rotate={alpha-2*(\i-0.5)*beta}](t-\i) {}
 (t-\i.bottom right corner) }
 node[anchor=south west,shift={(-alpha-90:w*0.1cm)},minimum size=w*1.2cm,rectangle,draw,rotate=-alpha](R){};   
\end{tikzpicture}    
\end{document}