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\documentclass{ppex}
\nonstopmode
\AtEndDocument {\end {fmffile}} \AtBeginDocument {\begin {fmffile}{ftmp}}
\usepackage {feynmp}
\pagestyle{empty}
\begin{document}
\ResetPreambleCommands
\ReadyForTheFray
\usepackage {feynmp}
\fbox{\begin{fmfgraph}(100,40)
\fmfleft{w}\fmfright{e}
\fmf{boson}{w,vw}\fmf{boson}{ve,e}
\fmf{fermion,tension=.5}{vw,vn,ve,vs,vw}
\fmf{gluon}{vn,vs}
\fmffixed{(0,h)}{vn,vs}
\fmfdot{vw,vn,ve,vs}
\end{fmfgraph}}
\fbox{\begin{fmfgraph}(100,40)
\fmfleft{w}\fmfright{e}
\fmf{boson}{w,vw}\fmf{boson}{ve,e}
\fmf{phantom,left,tension=.4}{vw,ve,vw}
\fmfdot{vw,ve}
\fmffreeze
\fmfipath{pn,ps}\fmfipair{vn,vs}
\fmfiequ{pn}{vpath (__vw, __ve)}
\fmfiequ{ps}{vpath (__ve, __vw)}
\fmfiequ{vn}{point .5length(pn) of pn}
\fmfiequ{vs}{point .5length(ps) of ps}
\fmfi{fermion}{subpath (0,.5)*length(pn) of pn}
\fmfi{fermion}{subpath (.5,1)*length(pn) of pn}
\fmfi{fermion}{subpath (0,.5)*length(ps) of ps}
\fmfi{fermion}{subpath (.5,1)*length(ps) of ps}
\fmfi{gluon}{vn--vs}
\fmfiv{dec.sh=circle,dec.siz=2thick}{vn}
\fmfiv{dec.sh=circle,dec.siz=2thick}{vs}
\end{fmfgraph}}
\end{document}
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