Missing labels with feynmp

Question

my question is exactly the same as

Missing labels with feynmf/feynmp?

but the answer there did not solve my problem. I am using WinEdt 7, installed Metapost, and copy and pasted that user's code into my WinEdt. I then

1. PDFTexify
2. Opened up fgraphs.mp and then did Tex > MetaPost > MetaPost to generate the fgraphs.1 file
3. Placed \includegraphics{fgraphs.1} into a separate tex file. When I PDFTexify, I get a diagram that has no labels.

This holds true if I change the fmfgraph environment to fmfgraph*.

Any help would be greatly appreciated!

Answer 1

It is better to use feynmp-auto so that if you compile the .tex file with --shell-escape there will be no need of running metapost separately.

\documentclass{article}
\usepackage{feynmp-auto}

% Needed to interpret generated *.1, *.2 etc. as ps files.
%\DeclareGraphicsRule{*}{mps}{*}{}

\begin{document}
Here is a vertex for a local potential in momentum space:
\begin{fmffile}{fgraphs}
  \begin{fmfgraph*}(40,30)
    % Note that the size is given in normal parentheses instead of curly
    % brackets in units of \unitlength (default 1pt).
    \fmfleft{i1,i2} % Define external vertices from bottom to top
    \fmfright{o1,o2}
    \fmf{fermion}{i1,v1,o1}
    \fmf{fermion}{i2,v2,o2}
    \fmf{photon,tension=0.3}{v1,v2}

    % These labels are missing!
    \fmflabel{$\vec{p}$}{i1}
    \fmflabel{$\vec{q}$}{i2}
    \fmflabel{$\vec{p}+\vec{k}$}{o1}
    \fmflabel{$\vec{p}-\vec{k}$}{o2}
  \end{fmfgraph*}
\end{fmffile}
\end{document}

To enable --shell-escape in winedt 7, go to Options → Execution Modes and then select pdflatex and type as in this figure ↓

Don't forget to press OK before exiting.