利用tikz重新定义beamer中的enumerate罗列环境\item形式_beamer中enumerate样式

利用tikz重新定义beamer中的enumerate罗列环境\item形式:

%利用tikz重新定义beamer中的enumerate罗列环境\item形式
\documentclass{beamer}
\input{preamble.tex}  
\input{tikzall.tex} %包含所有的tikz包
%%=====================================================================
\def\myitem{%
\item <1->[%
\stepcounter{enumi}%
{%

$$\begin{tikzpicture}[scale=1,line width=0.1pt] \useasboundingbox(-0.15,-0.15) rectangle(0.3,0.2); \coordinate (A) at(-0.15,-0.15); \coordinate (B) at(-0.15,0.2);   \coordinate (C) at(0.3,0.2);   \coordinate (D) at(0.3,-0.15); \coordinate (E) at($(A)!0.5!(B)+(0.05,0)$); \coordinate (F) at($(C)!0.5!(D)$); \shade[top color=yellow!75,bottom color=blue!75](A)--(E)--(F)--(A)--cycle; \shade[top color=green!75,bottom color=red!75](E)--(B)--(F)--(E)--cycle; \end{tikzpicture}$$ %
}%
]%
}%
%%=====================================================================
\def\myitemi{%
\item <1->[%
\stepcounter{enumi}%添加符号1,2,3...
{%
$$\begin{tikzpicture}[scale=1,line width=0.1pt] \useasboundingbox(-0.15,-0.15) rectangle(0.3,0.2); \coordinate (A) at(-0.15,-0.15); \coordinate (B) at(-0.15,0.2);   \coordinate (C) at(0.3,0.2);   \coordinate (D) at(0.3,-0.15); \coordinate [label =left:$\theenumi \text{:}$](E) at($(A)!0.5!(B)+(0.05,0)$); \coordinate (F) at($(C)!0.5!(D)$); \shade[top color=yellow!75,bottom color=blue!75](A)--(E)--(F)--(A)--cycle; \shade[top color=green!75,bottom color=red!75](E)--(B)--(F)--(E)--cycle; \end{tikzpicture}$$ %
}%
]%
}%
%%=====================================================================
$$\begin{document} \begin{frame} \noindent 第1种 \begin{enumerate} \myitem 你好 \myitem 大家好 \end{enumerate} \noindent 第2种 \begin{enumerate} \myitemi 你好 \myitemi 大家好 \end{enumerate} \end{frame} \end{document}$$

示例代码如下:修改后的结果如下: