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颜色代码中的变量？

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颜色代码中的变量？

我正在尝试创建一个循环遍历所有色调的圆圈，如下所示。右边就是我目前所拥有的。

在此处输入图片描述 在此处输入图片描述

\foreach\x in {5, 10, ..., 360} {
    \pgfmathparse{\x}
    \definecolor{tmpcolor}{HSB}{\pgfmathresult,255,255}
    \fill[color=tmpcolor](
        {0.5\textwidth + 0.22\textheight*sin(\x)},
        {-0.309017\textheight -0.22\textheight*cos(\x) + 0.5em}
    ) circle [radius = 1em];
}

如何在环境\foreach中使用颜色代码中的变量tikz。

答案1

如果您加载将目标颜色模型设置为 rgb 的选项，xcolor则可以在 tikz 中使用 hsb/Hsb 颜色：rgb

\documentclass{standalone}

\usepackage[rgb]{xcolor}
\usepackage{tikz}

\begin{document}

\begin{tikzpicture}
\foreach\x in {5, 10, ..., 360} {
    \definecolor{tmpcolor}{Hsb}{\x,1,1}
    \fill[color=tmpcolor](\x:22em) circle [radius = 1em];
}
\end{tikzpicture}

\end{document}

在此处输入图片描述

答案2

按照xcolor，要绘制色轮，颜色模型Hsb（值空间）比模型（值空间）[0, 360] * [0, 1] * [0, 1] \subset R^2更容易使用。HSB[0, 240]^3 \subset Z^3

\documentclass[margin=5pt, tikz]{standalone}
%\usepackage{tikz}

\newcommand{\drawHsbColorWheel}[1]{%
  \begin{tikzpicture}[rotate=90, baseline=0pt]
    \foreach\x in {0, #1, ..., 360} {
        % define color in Hsb model which has space [0, 360] * [0, 1] * [0, 1]
        \definecolor{tmpcolor}{Hsb}{\x,1,1}
        % convert to rgb, since tikz doesn't support Hsb/hsb color model
        \colorlet{tmpcolor}[rgb]{tmpcolor}
        % draw colored dots on a 5cm-radius circle
        \fill[fill=tmpcolor] (\x:5cm) circle[radius={5cm/2*tan(#1)}];
        % add note at origin
        \node[font=\Huge] {Step = $#1^\circ$};
    }
  \end{tikzpicture}%
}

\begin{document}
\drawHsbColorWheel{10}

\drawHsbColorWheel{8}

\drawHsbColorWheel{5}
\end{document}

在此处输入图片描述

答案3

您的代码看起来更小更干净，但我一直收到错误（不知道为什么）。我首先决定将 36 个圆圈分成三部分，需要根据位置改变色调。因此，从我的另一个项目中，我重新利用了一些代码：

\documentclass{article}
\usepackage{tikz}

\begin{document}

\begin{tikzpicture}
    % Iterate over a predefined list of hue values from 0 to 350 in steps of 10
    \foreach \hue [evaluate=\hue as \adjustedhue using {ifthenelse(\hue < 180, \hue + 120, \hue - 240)}] in {0,10,...,350} {
        % Calculate the red component based on the adjusted hue value
        \pgfmathsetmacro{\red}{ifthenelse(\adjustedhue < 60 || \adjustedhue >= 300, 1,
                    ifthenelse(\adjustedhue < 180, 1 - (\adjustedhue - 60)/120,
                    ifthenelse(\adjustedhue < 240, 0,
                    ifthenelse(\adjustedhue < 300, (\adjustedhue - 240)/60, 1))))}
        % Calculate the green component based on the adjusted hue value
        \pgfmathsetmacro{\green}{ifthenelse(\adjustedhue < 60, \adjustedhue/60,
                    ifthenelse(\adjustedhue < 180, 1,
                    ifthenelse(\adjustedhue < 240, 1 - (\adjustedhue - 120)/120,
                    ifthenelse(\adjustedhue < 360, 0, 1))))}
        % Calculate the blue component based on the adjusted hue value
        \pgfmathsetmacro{\blue}{ifthenelse(\adjustedhue < 180, 0,
                    ifthenelse(\adjustedhue < 240, (\adjustedhue - 180)/60,
                    ifthenelse(\adjustedhue < 360, 1, 0)))}
        % Define the color using the RGB values
        \definecolor{tmpcolor}{rgb}{\red,\green,\blue}
        % Fill a circle at the corresponding position with the defined color
        \fill[color=tmpcolor] ({0.5\textwidth + 4cm*cos(\hue)}, {0.5\textwidth + 4cm*sin(\hue)}) circle [radius=1em];
    }
\end{tikzpicture}

\end{document}

这将生成如下输出：

测试

我希望这能有所帮助。

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