pyfeyn
Draw Feynman diagrams with ROOT. Dependencies are pyROOT (import ROOT in either Python 2.7 or 3),
and having pdflatex and pdfcrop on your $PATH.
Examples
The following diagrams come from python examples.py
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The API is pretty simple. The 0-100 coordinate system can be optionally drawn with draw_grid().
import pyfeyn as pf
pf.init_diagram()
pf.draw_grid()
v_z = pf.Vertex(20, 50)
v_zqq = pf.Vertex(50, 50)
v_q1 = pf.Vertex(70, 70, label=pf.Label(r"\mathrm{q}", offsetx=3))
v_q2 = pf.Vertex(70, 30, label=pf.Label(r"\bar{\mathrm{q}}", offsetx=3))
pf.Propagator(v_z, v_zqq, typ="wavyline", label=pf.Label("Z", offsety=6)).draw()
pf.Propagator(v_zqq, v_q1, typ="line").draw()
pf.Propagator(v_zqq, v_q2, typ="line", fliparrow=True).draw()
pf.save_diagram("feynmandiagram_zqq.pdf")