58 lines
1.6 KiB
Python
58 lines
1.6 KiB
Python
from brown.interaction import UFuncWrapper
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from brown.brown import BrownIterator
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import numpy as np
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from collections import deque
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from copy import copy
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import matplotlib.pyplot as plt
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import matplotlib.animation as ani
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c = np.array([5, 10, 20, 30, 0, 0, 0, 1, -20, 0, -2, -0.1, 2, 0, 0, 0, 0, 0, 0], dtype=np.float16)
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#force_function = UFuncWrapper(0, c)
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#interaction2D = UFuncWrapper(1, c)
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borders_x = [-100, 100]
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borders_y = [-100, 100]
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n_particles = 6
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frames = 1000
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x_coords = np.random.uniform(borders_x[0] / 2, borders_x[1] / 2, n_particles).astype(np.float16)
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y_coords = np.random.uniform(borders_y[0] / 2, borders_y[1] / 2, n_particles).astype(np.float16)
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x_momenta = np.zeros(n_particles, dtype=np.float16)
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y_momenta = np.zeros(n_particles, dtype=np.float16)
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fig = plt.figure(figsize=(7, 7))
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ax = fig.add_axes([0, 0, 1, 1], frameon=False)
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ax.set_xlim(*borders_x)
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ax.set_xticks([])
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ax.set_ylim(*borders_y)
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ax.set_yticks([])
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plot, = ax.plot(x_coords, y_coords, "b.")
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center_of_mass, = ax.plot(x_coords.mean(), y_coords.mean(), "r-")
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center_of_mass_history_x = deque([x_coords.mean()])
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center_of_mass_history_y = deque([y_coords.mean()])
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brown = BrownIterator(-1, c
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, x_coords, y_coords
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, y_momenta, y_momenta
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, borders_x, borders_y
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, border_dampening=1
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, dt=0.001)
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u = iter(brown)
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def update(i):
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data = next(u)
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center_of_mass_history_x.append(x_coords.mean())
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center_of_mass_history_y.append(y_coords.mean())
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plot.set_data(*data)
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center_of_mass.set_data(center_of_mass_history_x, center_of_mass_history_y)
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animation = ani.FuncAnimation(fig, update, range(frames), interval=1)
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plt.show()
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