使用 tikz 在 blob 内添加文本

Question

我如何在 tikz 中绘制此图片。我确实尝试使用 hobby(tikz 库)，但我无法在其中放置任何文本：

我已经尝试过这个代码：

\documentclass{article}

\usepackage[latin1]{inputenc}
\usepackage{tikz}
\usetikzlibrary{hobby}
\begin{document}
\pagestyle{empty}

\begin{tikzpicture}

\path[draw,use Hobby shortcut,closed=true, fill=yellow!80] 
(0,0) .. (4,0) .. (4,4) .. (2.5,2) .. (0,0);


\path[draw,use Hobby shortcut,closed=true, fill=blue!20]
(1,0.5) .. (3.5,0.5) .. (3.5,2.5) .. (2.5,1.5) .. (1, 0.5);


\end{tikzpicture}

\end{document}

这给了我以下信息：

Answer 1

使用标签定义曲线的坐标：

\documentclass[border=3.141592]{standalone}
\usepackage{tikz}
\usetikzlibrary{backgrounds,
                hobby}
                
\begin{document}
    \begin{tikzpicture}[
every label/.append style = {inner sep=2ex, font=\sffamily\bfseries}
                        ]
\path   (3.5,2.5) coordinate[label=above right:A] (a)
        (2.5,1.5) coordinate[label=below right:B] (b);
%
\scoped[on background layer]
{
\path[draw,use Hobby shortcut,closed=true, fill=yellow!80]
(0,0) .. (4,0) .. (4,4) .. (2.5,2) .. (0,0);
\path[draw,use Hobby shortcut,closed=true, fill=blue!20]
(1,0.5) .. (3.5,0.5) .. (a) .. (b)  .. (1, 0.5);
}
    \end{tikzpicture}
\end{document}

Answer 2

\documentclass{article}

\usepackage[latin1]{inputenc}
\usepackage{tikz}
\usetikzlibrary{hobby,calc}
\begin{document}
    \pagestyle{empty}
    
    \begin{tikzpicture}
        
        \path[draw,use Hobby shortcut,closed=true, fill=yellow!80] 
        (0,0) .. (4,0) .. (4,4) .. (2.5,2) .. (0,0);

        
        \path[draw,use Hobby shortcut,closed=true, fill=blue!20]
        (1,0.5) .. (3.5,0.5) .. (3.5,2.5) .. (2.5,1.5) .. (1, 0.5);
        
        \node at ($(current bounding box)+(1cm,2cm)$) {Q};
    \end{tikzpicture}
    
\end{document}

使用

    \node at ($(current bounding box.center)+(0cm,0cm)$) {Q};