取消背景中 tikz 图片的线条

Question

我定义了一个命令 \kr 来绘制一个小圆圈，将其用作字母。后来我想取消一个圆圈。但取消线在背景中，见图。我怎样才能使取消线位于前景中？

代码：

\documentclass{beamer}
\usepackage{tikz}
\usepackage{cancel}
\newcommand*\kr[1]{%
  \begin{tikzpicture}[baseline=(C.base),inner sep=0pt,minimum size=0pt]
    \node (C) {\phantom{a}};
    \node[fill=#1!50,draw,circle,minimum size=0.3cm] (C.center) {};
  \end{tikzpicture}}

\begin{document}
  \kr{green} \cancel{\kr{green}}
\end{document}

Answer 1

也许是这样的：

\documentclass{beamer}
\usepackage{tikz}
\usepackage{cancel}
\newcommand*\kr[1]{%
  \begin{tikzpicture}[baseline=(C.base),inner sep=0pt,minimum size=0pt]
    \node (C) {\phantom{a}};
    \node[fill=#1!50,draw,circle,minimum size=0.3cm] (C.center) {};
  \end{tikzpicture}}

\newcommand*\mycancel[1]{\makebox{\rlap{#1}\cancel{\phantom{#1}}}}

\begin{document}
  \kr{green} \mycancel{\kr{green}}
\end{document}