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在中心线上添加空间

tag-icon • tag-icon tikz-pgf
在中心线上添加空间

例如，如何从给定的中心线绘制一条梁（或更奇特的形状）？这就是我的意思，但解决方案不太好。我想添加图案等。

\documentclass[12pt,tikz,border=5pt]{standalone}
\usetikzlibrary{calc}


\begin{document}

\begin{tikzpicture}
% grid to see the coordinates

% Point A with circle and label
\coordinate [label={[label distance=3mm]below:A}] (A) at (1,3);

% Point B with circle and label
\coordinate [label={[label distance=3mm]right:B}](B) at (6,6);

% Point C with circle and label
\coordinate [label={[label distance=3mm]below:C}](C) at (7,4);

% Point D with circle and label
\coordinate [label={[label distance=3mm]right:D}](D) at (9,4);
\draw (D) circle [radius=3pt];

\draw[line width=20pt,line cap=round] (A) -- (B) -- (C) -- (D); 
\draw[line width=14pt,white,line cap=round] (A) -- (B) -- (C) -- (D);    
\draw (A) -- (B) -- (C) -- (D);

% grid to see the coordinates
\draw[help lines, step=1] (0,0) grid (10,8);

\draw (A) circle [radius=3pt];
\draw (B) circle [radius=3pt];
\draw (C) circle [radius=3pt];
\draw (D) circle [radius=3pt];

\end{tikzpicture}
\end{document}

在此处输入图片描述

答案1

你可以适应我之前的回答像这样：

\documentclass[tikz,border=5]{standalone}
\usetikzlibrary{calc}
\usetikzlibrary{patterns}
\tikzset{
  rect/.style= { to path={ let \n1={sqrt(2)*#1},
    \p1=($(\tikztostart)!\n1!-135:(\tikztotarget)$), \p2=($(\tikztostart)!\n1!135:(\tikztotarget)$),
    \p3=($(\tikztotarget)!\n1!-135:(\tikztostart)$), \p4=($(\tikztotarget)!\n1!135:(\tikztostart)$)
    in (\p1) -- (\p2) -- (\p3) -- (\p4) --cycle (\tikztotarget)}
  },
  round/.style={rounded corners=#1,rect/.default=#1}
}
\begin{document}
  \begin{tikzpicture}
    \draw[help lines] (0,0) grid (7,5);

    \def\mypath{(1,2) foreach \a in {30,-45,0,90} {to[rect] ++(\a:2)}}
    \fill[round=4mm,black] \mypath;
    \shade[round=3mm,left color=red, right color=blue] \mypath;
    \pattern[round=3mm,pattern color=white,pattern=bricks] \mypath;

  \end{tikzpicture}
\end{document}

在此处输入图片描述

答案2

使用pgf-blur。文档说阴影总是黑色的。但要找出那个黑色，并用我们的\blurcolor

\documentclass[tikz]{standalone}
\usetikzlibrary{shadows.blur}
\makeatletter
\tikzset{
    /tikz/render blur shadow/.code={
        \pgfbs@savebb
        \pgfsyssoftpath@getcurrentpath{\pgfbs@input@path}%
        \pgfbs@compute@shadow@bbox
        \pgfbs@process@rounding{\pgfbs@input@path}{\pgfbs@fadepath}%
        \pgfbs@apply@canvas@transform
        \colorlet{pstb@shadow@color}{white!\pgfbs@opacity!black}%
        \pgfdeclarefading{shadowfading}{\pgfbs@paint@fading}%
        \pgfsetfillcolor{\blurcolor}%
        \pgfsetfading{shadowfading}%
            {\pgftransformshift{\pgfpoint{\pgfbs@midx}{\pgfbs@midy}}}%
        \pgfbs@usebbox{fill}%
        \pgfbs@restorebb
    }
}
\begin{document}
    \begin{tikzpicture}
        \fill[black](0,2)rectangle(10,7);
        \def\blurcolor{yellow}
        \path[blur shadow,shadow xshift=0,shadow yshift=0,
              shadow blur radius=20pt,shadow opacity=100,shadow blur steps=100]
            (1,3)--(6,6)--cycle(6,6)--(7,4)--cycle(7,4)--(9,4)--cycle;
    \end{tikzpicture}
\end{document}

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