框架中的蜘蛛网效果

Question

从旧的开始问题使用用户代码@伊格纳西，

\documentclass{article}
\usepackage[most]{tcolorbox}
\usepackage{pifont}
\newtcolorbox{mybox}[2][]{%
    colback=teal!10,
    coltitle=black,
    colframe=teal!30,
    fonttitle=\bfseries,
    title=#2, 
    sharp corners,
    rounded corners=southeast,
    arc is angular,
    arc=3mm,
    boxrule=0pt,
    enhanced,
    overlay={\node[font=\Huge, text=cyan!70!black] at ([yshift=-4mm]interior.north west) {\ding{228}};},
    underlay={
        \path[fill=tcbcolback!80!black] ([yshift=3mm]interior.south east)--++(-0.4,-0.1)--++(0.1,-0.2);
        \path[draw=tcbcolframe,shorten <=-0.05mm,shorten >=-0.05mm] ([yshift=3mm]interior.south east)--++(-0.4,-0.1)--++(0.1,-0.2);
    },
    drop fuzzy shadow,
    #1
    }

\usepackage{lipsum}
\begin{document}
\begin{mybox}{An example}
\lipsum[1]
\end{mybox}
\end{document}

是否可以在浅青色框架上创建白色（或其他特定颜色）的蜘蛛线？

Answer 1

可以添加任何图形（或文本）作为水印。但除非overlays您使用hooks库中的选项（请参阅https://tex.stackexchange.com/a/593025/1952）。

以下代码添加蜘蛛网作为水印图形，并且原始overlay选项已转换为overlay app并放置在水印定义之后。

\documentclass{article}
\usepackage[most, hooks]{tcolorbox}
\usepackage{pifont}
\newtcolorbox{mybox}[2][]{%
    colback=teal!10,
    coltitle=black,
    colframe=teal!30,
    fonttitle=\bfseries,
    title=#2, 
    sharp corners,
    rounded corners=southeast,
    arc is angular,
    arc=3mm,
    boxrule=0pt,
    enhanced,
    underlay={
        \path[fill=tcbcolback!80!black] ([yshift=3mm]interior.south east)--++(-0.4,-0.1)--++(0.1,-0.2);
        \path[draw=tcbcolframe,shorten <=-0.05mm,shorten >=-0.05mm] ([yshift=3mm]interior.south east)--++(-0.4,-0.1)--++(0.1,-0.2);
    },
    watermark graphics={SpiderWeb.png},
    watermark opacity=0.35,
    watermark overzoom=1,
    overlay app={\node[font=\Huge, text=cyan!70!black] at ([yshift=-4mm]interior.north west) {\ding{228}};},
    drop fuzzy shadow,
    #1
    }

\usepackage{lipsum}
\begin{document}
\begin{mybox}{An example}
\lipsum[1]
\end{mybox}

\end{document}