     \pgfusepath{draw}     \pgfscope         \pgftransformxshift{\ctikzvalof{bipoles/vsourceam/margin}\pgf@circ@res@left}         \pgftext[rotate=-\pgf@circ@direction]{$-$}         \pgfusepath{draw}     \endpgfscope     \pgfscope         \pgftransformxshift{\ctikzvalof{bipoles/vsourceam/margin}\pgf@circ@res@right}         \pgftext[rotate=-\pgf@circ@direction]{$+$}         \pgfusepath{draw}     \endpgfscope } \makeatother