Text Formatting ⇒ Newcommand works but newenvironment fails to wrapfig

[yiorgosb]

I place this topic here since it is in essence a formatting issue.
I've created a newenvironment for wrapping a figure but it fails to wrap text (text overlaps figure). When I place the same code to a newcommand everything works fine and I can't figure out why.
I quote the two code excerpts below.

New envrironment

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\newenvironment{yfifg}[1][] { 

\begin{wrapfigure}{r}{0.2\textwidth}
		 \begin{center}
		    \includegraphics[width=0.18\textwidth]{images/c\thechapter /\thecntfig}
		 \end{center}
		 \caption{#1}
	\end{wrapfigure} 

	\stepcounter{cntfig}} {}

New command

Code: Select all

\newcommand{\yfig}[1]{ 

\begin{wrapfigure}{r}{0.2\textwidth}

		 \begin{center}

		    \includegraphics[width=0.18\textwidth]{images/c\thechapter /\thecntfig}

		 \end{center}

		 \caption{#1}

	\end{wrapfigure}}

Obviously in text they are called as

Code: Select all

\begin{yfifg} {acaption} \end{yfifg}
and
\fig{acaption}

respectively.


PS: (A simple question for not open a new topic) both environment and command may accept only one default value?