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# visualization.py - Tests the visualization module. Checks 2D
# plotting of a waveguide with several sources, monitors, and
# boundary conditions. Checks for subdomain plots.
#
# Also tests the animation run function, mp4 output, jshtml output, and git output.
from __future__ import division
import unittest
from subprocess import call
import meep as mp
import numpy as np
import os
# Make sure we have matplotlib installed
import matplotlib
matplotlib.use('agg') # Set backend for consistency and to pull pixels quickly
from matplotlib import pyplot as plt
import io
def hash_figure(fig):
buf = io.BytesIO()
fig.savefig(buf, format='raw')
buf.seek(0)
data = np.frombuffer(buf.getvalue(), dtype=np.uint8)
return np.sum((data > np.mean(data)) + data)
def setup_sim(zDim=0):
cell = mp.Vector3(16,8,zDim)
# A simple waveguide
geometry = [mp.Block(mp.Vector3(mp.inf,1,1),
center=mp.Vector3(),
material=mp.Medium(epsilon=12))]
# Add point sources
sources = [mp.Source(mp.ContinuousSource(frequency=0.15),
component=mp.Ez,
center=mp.Vector3(-5,0),
size=mp.Vector3(0,0,2)),
mp.Source(mp.ContinuousSource(frequency=0.15),
component=mp.Ez,
center=mp.Vector3(0,2),
size=mp.Vector3(0,0,2)),
mp.Source(mp.ContinuousSource(frequency=0.15),
component=mp.Ez,
center=mp.Vector3(-1,1),
size=mp.Vector3(0,0,2)),
mp.Source(mp.ContinuousSource(frequency=0.15),
component=mp.Ez,
center=mp.Vector3(-2,-2,1),
size=mp.Vector3(0,0,0)),
]
# Add line sources
sources += [mp.Source(mp.ContinuousSource(frequency=0.15),
component=mp.Ez,
size=mp.Vector3(0,2,2),
center=mp.Vector3(-6,0)),
mp.Source(mp.ContinuousSource(frequency=0.15),
component=mp.Ez,
size=mp.Vector3(0,2,2),
center=mp.Vector3(0,1))]
# Add plane sources
sources += [mp.Source(mp.ContinuousSource(frequency=0.15),
component=mp.Ez,
size=mp.Vector3(2,2,2),
center=mp.Vector3(-3,0)),
mp.Source(mp.ContinuousSource(frequency=0.15),
component=mp.Ez,
size=mp.Vector3(2,2,2),
center=mp.Vector3(0,-2))]
# Different pml layers
pml_layers = [mp.PML(2.0,mp.X),mp.PML(1.0,mp.Y,mp.Low),mp.PML(1.5,mp.Y,mp.High)]
if zDim > 0:
pml_layers += [mp.PML(1.5,mp.Z)]
resolution = 10
sim = mp.Simulation(cell_size=cell,
boundary_layers=pml_layers,
geometry=geometry,
sources=sources,
resolution=resolution)
# Line monitor
sim.add_flux(1,0,1,mp.FluxRegion(center=mp.Vector3(5,0,0),size=mp.Vector3(0,4,4), direction=mp.X))
# Plane monitor
sim.add_flux(1,0,1,mp.FluxRegion(center=mp.Vector3(2,0,0),size=mp.Vector3(4,4,4), direction=mp.X))
return sim
def view_sim():
sim = setup_sim(8)
xy0 = mp.Volume(center=mp.Vector3(0,0,0), size=mp.Vector3(sim.cell_size.x,sim.cell_size.y,0))
xy1 = mp.Volume(center=mp.Vector3(0,0,1), size=mp.Vector3(sim.cell_size.x,sim.cell_size.y,0))
yz0 = mp.Volume(center=mp.Vector3(0,0,0), size=mp.Vector3(0,sim.cell_size.y,sim.cell_size.z))
yz1 = mp.Volume(center=mp.Vector3(1,0,0), size=mp.Vector3(0,sim.cell_size.y,sim.cell_size.z))
xz0 = mp.Volume(center=mp.Vector3(0,0,0), size=mp.Vector3(sim.cell_size.x,0,sim.cell_size.z))
xz1 = mp.Volume(center=mp.Vector3(0,1,0), size=mp.Vector3(sim.cell_size.x,0,sim.cell_size.z))
vols = [xy0,xy1,yz0,yz1,xz0,xz1]
titles = ['xy0','xy1','yz0','yz1','xz0','xz1']
xlabel = ['x','x','y','y','x','x']
ylabel = ['y','y','z','z','z','z']
for k in range(len(vols)):
ax = plt.subplot(2,3,k+1)
sim.plot2D(ax=ax,output_plane=vols[k])
ax.set_xlabel(xlabel[k])
ax.set_ylabel(ylabel[k])
ax.set_title(titles[k])
plt.tight_layout()
plt.show()
class TestVisualization(unittest.TestCase):
@classmethod
def setUpClass(cls):
cls.temp_dir = mp.make_output_directory()
@classmethod
def tearDownClass(cls):
mp.delete_directory(cls.temp_dir)
def test_plot2D(self):
# Check plotting of geometry with several sources, monitors, and PMLs
f = plt.figure()
ax = f.gca()
sim = setup_sim()
ax = sim.plot2D(ax=ax)
if mp.am_master():
hash_figure(f)
#self.assertAlmostEqual(hash_figure(f),10231488)
# Check plotting of fields after timestepping
f = plt.figure()
ax = f.gca()
sim.run(until=200)
ax = sim.plot2D(ax=ax,fields=mp.Ez)
if mp.am_master():
hash_figure(f)
#self.assertAlmostEqual(hash_figure(f),79786722)
# Check output_plane feature
f = plt.figure()
ax = f.gca()
vol = mp.Volume(center=mp.Vector3(),size=mp.Vector3(2,2))
ax = sim.plot2D(ax=ax,fields=mp.Ez,output_plane=vol)
if mp.am_master():
hash_figure(f)
#self.assertAlmostEqual(hash_figure(f),68926258)
@unittest.skipIf(call(['which', 'ffmpeg']) != 0, "ffmpeg is not installed")
def test_animation_output(self):
# ------------------------- #
# Check over 2D domain
# ------------------------- #
sim = setup_sim() # generate 2D simulation
Animate = mp.Animate2D(sim,fields=mp.Ez, realtime=False, normalize=False) # Check without normalization
Animate_norm = mp.Animate2D(sim,mp.Ez,realtime=False,normalize=True) # Check with normalization
# test both animation objects during same run
sim.run(
mp.at_every(1,Animate),
mp.at_every(1,Animate_norm),
until=5)
# Test outputs
Animate.to_mp4(5,os.path.join(self.temp_dir, 'test_2D.mp4')) # Check mp4 output
Animate.to_gif(150,os.path.join(self.temp_dir, 'test_2D.gif')) # Check gif output
Animate.to_jshtml(10) # Check jshtml output
Animate_norm.to_mp4(5,os.path.join(self.temp_dir, 'test_2D_norm.mp4')) # Check mp4 output
Animate_norm.to_gif(150,os.path.join(self.temp_dir, 'test_2D_norm.gif')) # Check gif output
Animate_norm.to_jshtml(10) # Check jshtml output
# ------------------------- #
# Check over 3D domain
# ------------------------- #
sim = setup_sim(5) # generate 2D simulation
Animate_xy = mp.Animate2D(sim,fields=mp.Ey, realtime=False, normalize=True) # Check without normalization
Animate_xz = mp.Animate2D(sim,mp.Ey,realtime=False,normalize=True) # Check with normalization
# test both animation objects during same run
sim.run(
mp.at_every(1,mp.in_volume(mp.Volume(center=mp.Vector3(),size=mp.Vector3(sim.cell_size.x,sim.cell_size.y)),Animate_xy)),
mp.at_every(1,mp.in_volume(mp.Volume(center=mp.Vector3(),size=mp.Vector3(sim.cell_size.x,0,sim.cell_size.z)),Animate_xz)),
until=5)
# Test outputs
Animate_xy.to_mp4(5,os.path.join(self.temp_dir, 'test_3D_xy.mp4')) # Check mp4 output
Animate_xy.to_gif(150,os.path.join(self.temp_dir, 'test_3D_xy.gif')) # Check gif output
Animate_xy.to_jshtml(10) # Check jshtml output
Animate_xz.to_mp4(5,os.path.join(self.temp_dir, 'test_3D_xz.mp4')) # Check mp4 output
Animate_xz.to_gif(150,os.path.join(self.temp_dir, 'test_3D_xz.gif')) # Check gif output
Animate_xz.to_jshtml(10) # Check jshtml output
'''
Travis does not play well with Mayavi
def test_3D_mayavi(self):
sim = setup_sim(4)
sim.plot3D()
'''
if __name__ == '__main__':
unittest.main()
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