如何填补交界处

Question

我需要一个反向和扭曲的字母“D”，下图在线条连接处有空白。

\documentclass[dvipsnames,11pt]{scrartcl}
    \usepackage{tikz,pgfornament,tikzrput}         % altermundus.com/pages/tkz/tikzrput/

    \begin{document}

    \begin{tikzpicture}

    \draw  [line width=2mm,line cap = round, red] (0,3) ..controls (-4,1) and (-5,-2) .. (0,-3);
    \draw  [line width=2mm,rounded corners, red] (0,3) --(0,-3);

    \end{tikzpicture}
    \end{document}  

Answer 1

将两行合并为一行。两个例子：

• 用圆线连接（红线）
• 无圆角线连接（蓝线）

用于连接线cycle的最后一条线坐标

\documentclass[dvipsnames,11pt]{scrartcl}
\usepackage{tikz,pgfornament,tikzrput}         % altermundus.com/pages/tkz/tikzrput/

\begin{document}
\begin{tikzpicture}
\draw [line width=2mm,line join = round, red] (0,3) ..controls (-4,1) and (-5,-2) .. (0,-3) -- cycle;
    \begin{scope}[xshift=44mm]
\draw [line width=2mm,blue] (0,3) ..controls (-4,1) and (-5,-2) .. (0,-3) -- cycle;
    \end{scope}
\end{tikzpicture}
\end{document}