如何在 fncychap 中的章节样式中获得矩形的颜色渐变？(\usepackage[Bjornstrup]{fncychap})？

Question

我点击此链接更改了 fncychap 中章节样式的背景颜色：

如何在 fncychap 中更改章节样式的背景颜色？(\usepackage[Bjornstrup]{fncychap})

但是，我尝试添加颜色渐变，使矩形左侧的蓝色比矩形右侧的蓝色更深，但做不到。有什么建议吗？

Answer 1

试试这个代码。渐变是使用 完成的tikz。要使左侧变暗，请更改path fading=west,为path fading=east,（并更改章节标题的颜色，见下文）。

\documentclass[a4paper,12pt]{report}

\usepackage[Bjornstrup]{fncychap}

%%% ******************************************************* added
\definecolor{titlechap}{rgb}{0.9,0.9,0.9} % color of the chapter title <<<
\definecolor{numberchap}{rgb}{0.6,0.6,0.6}% color of the chapter number <<<<

\usepackage{tikz}
\usetikzlibrary{fadings,positioning}
\newcommand{\gradient}[1]{
\begin{tikzpicture}
    \node (rect) at (0,0) [fill=blue,,path fading=west,minimum width=\linewidth,minimum height=2.5cm] {};
    \node(title)[above left = 10pt and 10pt of rect.south east, anchor=south east, font=\CTV] {\textcolor{titlechap}{#1}};
    \ifnum \thechapter>0\node[left = 10pt of rect.north east,  anchor=center, font=\CNoV] {\textcolor{numberchap}{\thechapter}};\fi%
\end{tikzpicture}%
\vskip 40pt%
}

\renewcommand{\DOCH}{}
\renewcommand{\DOTI}[1]{\gradient{#1}}
\renewcommand{\DOTIS}[1]{\gradient{#1}}

%%*******************************************************************************
\begin{document}
    
    \tableofcontents   
    \chapter{Introduccion}
    \section{One}   
    \chapter{Technical content}
    \section{Two}
    
\end{document}

这是另一种变体：

%%% ******************************************************* added
\definecolor{titlechap}{rgb}{0.4,0.4,0.4} % color of the chapter title <<<
\definecolor{numberchap}{rgb}{0.6,0.6,0.6}% color of the chapter number <<<<

\usepackage{tikz}
\usetikzlibrary{fadings,positioning}
\newcommand{\gradient}[1]{
\begin{tikzpicture}
    \node (rect) at (0,0) [fill=blue,,path fading=east,minimum width=\linewidth,minimum height=2.5cm] {};
    \node(title)[above left = 10pt and 10pt of rect.south east, anchor=south east, font=\CTV] {\textcolor{titlechap}{#1}};
    \ifnum \thechapter>0\node[left = 10pt of rect.north east,  anchor=center, font=\CNoV] {\textcolor{numberchap}{\thechapter}};\fi%
\end{tikzpicture}%
\vskip 40pt%
}

\renewcommand{\DOCH}{}
\renewcommand{\DOTI}[1]{\gradient{#1}}
\renewcommand{\DOTIS}[1]{\gradient{#1}}

%%*******************************************************************************