tikz 将颜色字符串转换为十六进制值

Question

我希望将 tikz 中的颜色字符串转换为十六进制值。

\documentclass[border=1mm]{standalone}
\usepackage{tikz}
\begin{document}
\begin{tikzpicture}
\tikzset{box/.style={draw,outer sep=0,minimum size=1cm}}
\def\dy{1}
\foreach \col [count=\i] in {red,orange,yellow,green,cyan,blue,purple} {
    \def\mycol{\col!40!gray}
    \node[box,yshift=1cm*\i*\dy,fill=\mycol,label=left:\mycol] (main) {ABC};
}
\end{tikzpicture}
\end{document}

所以我希望展示red!40!grey类似的东西#xxxxxxxx但不展示如何进行这样的转换！

Answer 1

也许是这个（带有\extractcolorspecs和\convertcolorspec来自xcolor包，由包加载tikz）？

\documentclass[border=1mm]{standalone}
\usepackage{tikz}
\begin{document}
\begin{tikzpicture}
\tikzset{box/.style={draw,outer sep=0,minimum size=1cm}}
\def\dy{1}
\foreach \col [count=\i] in {red,orange,yellow,green,cyan,blue,purple} {
    \def\mycol{\col!40!gray}
    \extractcolorspecs{\mycol}{\modelcmd}{\colorcmd}
    \convertcolorspec{\modelcmd}{\colorcmd}{HTML}\hex
    \node[box,yshift=1cm*\i*\dy,fill=\mycol,label=left:\mycol] (main) {\#\hex};
}
\end{tikzpicture}
\end{document}

Answer 2

不是在中完成的tikz，而是使用colorinfo包来提取颜色信息，并使用binhex.tex包将颜色信息转换为十六进制格式。

在这里扩展我的答案在 LaTeX 中绘制调色板框允许根据 LaTeX 颜色规范进行规范。

\documentclass{article}
\usepackage{xcolor,stackengine,colorinfo}
\input binhex.tex
\newcommand\palbox[1]{{\sffamily\fboxsep=5pt\relax\fboxrule=1pt\relax\footnotesize%
  \fcolorbox{gray!50}{gray!10}{%
    \stackengine{8pt}{%
      \colorbox[RGB]{#1}{\rule{60pt}{0pt}\rule{0pt}{60pt}}%
    }{%
      \color{black!60}\stackengine{12pt}{\intohex{#1}}{\saycolors{#1}}{U}{l}{F}{F}{S}%
    }{U}{l}{F}{F}{S}%
  }%
}}
\newcommand\saycolors[1]{\saycolorsaux#1\relax}
\def\saycolorsaux#1 #2 #3\relax{R:#1 G:#2 B:#3}
\newcommand\intohex[1]{\#\intohexaux#1\relax}
\def\intohexaux#1 #2 #3\relax{\twodigithex{#1}\twodigithex{#2}\twodigithex{#3}}
\newcommand\twodigithex[1]{\ifnum#1<16\relax0\fi\MakeLowercase{\hex{#1}}}

\newlength\rcomp
\newlength\gcomp
\newlength\bcomp
\newcommand\colcomponents[1]{\expandafter\colcomponentsaux#1\relax}
\def\colcomponentsaux#1,#2,#3\relax{%
  \setlength\rcomp{\dimexpr255\dimexpr#1pt\relax+.5pt\relax}%
  \setlength\gcomp{\dimexpr255\dimexpr#2pt\relax+.5pt\relax}%
  \setlength\bcomp{\dimexpr255\dimexpr#3pt\relax+.5pt\relax}%
}
\newcommand\truncatergb[1]{\expandafter\truncatergbaux#1\relax}
\def\truncatergbaux#1.#2\relax{#1}
\newcommand\xpalbox[1]{%
  \colorlet{mycolor}{#1}%
  \setbox0=\hbox{\colorInfo{mycolor}}%
  \colcomponents{\colorValue}%
  \edef\Rcomp{\truncatergb{\the\rcomp}}%
  \edef\Gcomp{\truncatergb{\the\gcomp}}%
  \edef\Bcomp{\truncatergb{\the\bcomp}}%
  \edef\tmp{\expandafter\expandafter\expandafter\Rcomp
    \expandafter\expandafter\expandafter\space
    \expandafter\Gcomp\expandafter\space\Bcomp}%
  \expandafter\palbox\expandafter{\tmp} = \colorbox{mycolor}{#1}%
  \par
}
\begin{document}
\xpalbox{blue!40!red!25}
\xpalbox{blue!60!green!45}
\end{document}

Answer 3

基于@quark67 的答案的另一个例子：

\documentclass[border=1mm]{standalone}
\usepackage{tikz}
\usetikzlibrary{positioning,chains}
\begin{document}
    \begin{tikzpicture}[start chain=M1 going below,node distance=0]
    \tikzset{box/.style={draw,outer sep=0,minimum width=2cm,on chain=M1}}
    \def\dy{1}
    \foreach \col [count=\i] in {red,orange,yellow,green,cyan,blue,purple,
        {rgb,255:red,0; green,255; blue,0},
        {rgb:red,1;green,1;yellow,1}} {
        \extractcolorspecs{\col}{\modelcmd}{\colorcmd}
        \convertcolorspec{\modelcmd}{\colorcmd}{HTML}\hex
        \node[box,fill=\col,label=right:\col] (main) {\#\hex};
    }
    \end{tikzpicture}
\end{document}