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Add add_tree function to GenEvent #104

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Add add_tree function to GenEvent #104

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1 change: 1 addition & 0 deletions src/core.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -536,6 +536,7 @@ PYBIND11_MODULE(_core, m) {
METH(set_units, GenEvent)
METH(event_pos, GenEvent)
PROP_RO_OL(beams, GenEvent, std::vector<ConstGenParticlePtr>)
METH(add_tree, GenEvent)
METH_OL(add_vertex, GenEvent, void, GenVertexPtr)
METH_OL(add_particle, GenEvent, void, GenParticlePtr)
METH(set_beam_particles, GenEvent)
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70 changes: 52 additions & 18 deletions tests/test_basic.py
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Original file line number Diff line number Diff line change
Expand Up @@ -4,7 +4,7 @@
import numpy as np


def make_evt():
def create_event_components():
r"""
In this example we will generate the following event by hand

Expand All @@ -29,12 +29,7 @@ def make_evt():
v2__p4 \
/ p6
p2

Finally, the event gets a weight.
"""
evt = hep.GenEvent(hep.Units.GEV, hep.Units.MM)
evt.event_number = 1

# px py pz e pdgid status
p1 = hep.GenParticle((0.0, 0.0, 7000.0, 7000.0), 2212, 1)
p1.generated_mass = 0.938
Expand All @@ -52,41 +47,69 @@ def make_evt():
p7.generated_mass = 0.01
p8 = hep.GenParticle((3.962, -49.498, -26.687, 56.373), -2, 8)
p8.generated_mass = 0.006
evt.add_particle(p1)
evt.add_particle(p2)
evt.add_particle(p3)
evt.add_particle(p4)
evt.add_particle(p5)
evt.add_particle(p6)
evt.add_particle(p7)
evt.add_particle(p8)

# make sure vertex is not optimized away by WriterAscii
v1 = hep.GenVertex((1.0, 1.0, 1.0, 1.0))
v1.add_particle_in(p1)
v1.add_particle_out(p3)
evt.add_vertex(v1)

# make sure vertex is not optimized away by WriterAscii
v2 = hep.GenVertex((2.0, 2.0, 2.0, 2.0))
v2.add_particle_in(p2)
v2.add_particle_out(p4)
evt.add_vertex(v2)

# make sure vertex is not optimized away by WriterAscii
v3 = hep.GenVertex((3.0, 3.0, 3.0, 3.0))
v3.add_particle_in(p3)
v3.add_particle_in(p4)
v3.add_particle_out(p5)
v3.add_particle_out(p6)
evt.add_vertex(v3)

# make sure vertex is not optimized away by WriterAscii
v4 = hep.GenVertex((4.0, 4.0, 4.0, 4.0))
v4.add_particle_in(p5)
v4.add_particle_out(p7)
v4.add_particle_out(p8)
evt.add_vertex(v4)

return [p1, p2, p3, p4, p5, p6, p7, p8], [v1, v2, v3, v4]


def make_evt():
r"""
In this example we will generate the following event by hand

name status pdg_id parent Px Py Pz Energy Mass
1 !p+! 1 2212 0,0 0.000 0.000 7000.000 7000.000 0.938
2 !He4! 2 1000020040 0,0 0.000 0.000 -7000.000 7000.000 3.756
=============================================================================
3 !d! 3 1 1,1 0.750 -1.569 32.191 32.238 0.000
4 !u~! 4 -2 2,2 -3.047 -19.000 -54.629 57.920 0.000
5 !W-! 5 -24 3,4 1.517 -20.68 -20.605 85.925 80.799
6 !gamma! 6 22 3,4 -3.813 0.113 -1.833 4.233 0.000
7 !d! 7 1 5,5 -2.445 28.816 6.082 29.552 0.010
8 !u~! 8 -2 5,5 3.962 -49.498 -26.687 56.373 0.006

The corresponding graph looks like this

p7
p1 /
\v1__p3 p5---v4
\_v3_/ \
/ \ p8
v2__p4 \
/ p6
p2

Finally, the event gets a weight.
"""
evt = hep.GenEvent(hep.Units.GEV, hep.Units.MM)
evt.event_number = 1

particles, vertices = create_event_components()
for p in particles:
evt.add_particle(p)
for v in vertices:
evt.add_vertex(v)

evt.weights = [1.0]

Expand All @@ -104,6 +127,17 @@ def evt():
return make_evt()


def test_GenEvent_add_tree():
evt1 = make_evt()
particles, _ = create_event_components()
evt2 = hep.GenEvent(hep.Units.GEV, hep.Units.MM)
evt2.add_tree(particles)
assert len(evt2.particles) == len(evt1.particles)
assert hep.equal_particle_sets(evt2.particles, evt1.particles)
assert len(evt2.vertices) == len(evt1.vertices)
assert hep.equal_vertex_sets(evt2.vertices, evt1.vertices)


def test_GenHeavyIon():
hi = hep.GenHeavyIon()
assert hi == hep.GenHeavyIon()
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