用不同颜色建造圆圈项目

Question

我打算构建与以下代码完全相同的项目，但每次出现时在圆圈和字体中填充不同的颜色（例如，第一个为红色，白色为“1”，第二个为绿色，棕色为“2”）。我该怎么做？谢谢。

\documentclass[10pt,xcolor={dvipsnames,table}]{beamer}

\mode<article> % only for the article version
{
  \usepackage{fullpage}
  \usepackage{hyperref}
}


\mode<presentation>
{
  %\setbeamertemplate{background canvas}[vertical shading][bottom=red!10,top=blue!10]
  \setbeamercovered{transparent}
  \usefonttheme{serif}
  \usecolortheme{crane}
}

\usepackage{tikz}

\setbeamercovered{dynamic}

\setbeamertemplate{items}[circle]

\usetikzlibrary{tikzmark}

\newcommand{\itemnum}[1]{%
\setcounter{enumi}{#1}\usebeamertemplate{enumerate item}%
}

\begin{document}

\begin{frame}
These are my items~{\itemnum{1}} and~{\itemnum{2}}  ...
\end{frame}

\end{document} 

Answer 1

由于模板enumerate item使用了的颜色设置，item projected您可以使用它来调整圆圈（bg）和文本（fg）的颜色。

我已经添加\unskip并\unbreak调整水平间距（我认为之前的空间太多）并抑制换行。

代码

\documentclass[10pt,xcolor={dvipsnames,table}]{beamer}
\mode<article>{ % only for the article version
  \usepackage{fullpage}
  \usepackage{hyperref}
}
\mode<presentation>{
  %\setbeamertemplate{background canvas}[vertical shading][bottom=red!10,top=blue!10]
  \setbeamercovered{transparent}
  \usefonttheme{serif}
  \usecolortheme{crane}
}
\setbeamercovered{dynamic}
\setbeamertemplate{items}[circle]
\newcommand{\itemnum}[2][]{{% extra {} to keep changes local
  \setbeamercolor{item projected}{#1}%
  \setcounter{enumi}{#2}%
  \unskip\nobreak % no linebreak and no space before it
  \usebeamertemplate{enumerate item}%
}}
\begin{document}
\begin{frame}
These are my items \itemnum[bg=red,   fg=white]{1}
               and \itemnum[fg=brown, bg=green]{2} \dots
\end{frame}
\end{document}

输出

Answer 2

您已经得到了问题的完美答案，但作为替代方案：这里有一个使用circledsteps包的解决方案

\documentclass[10pt,xcolor={dvipsnames,table}]{beamer}

\mode<article> % only for the article version
{
  \usepackage{fullpage}
  \usepackage{hyperref}
}


\mode<presentation>
{
  %\setbeamertemplate{background canvas}[vertical shading][bottom=red!10,top=blue!10]
  \setbeamercovered{transparent}
  \usefonttheme{serif}
  \usecolortheme{crane}
}

\usepackage{tikz}

\setbeamercovered{dynamic}

\usepackage{circledsteps}

\setbeamertemplate{items}[circle]

\usetikzlibrary{tikzmark}

\newcommand{\itemnum}[1]{%
\setcounter{enumi}{#1}\usebeamertemplate{enumerate item}%
}

\begin{document}

\begin{frame}
These are my items~{\footnotesize\Circled[inner color=white,fill color=red,outer color=red]{1}} and~{\footnotesize\Circled[inner color=lightgray,fill color=green,outer color=green]{2}}  ...
\end{frame}

\end{document}