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Particle.py
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Particle.py
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import numpy as np
from Velocity import Velocity
from Position import Position
from Vector import Vector
from errors import *
class Particle:
"""
Class that represents the state of an individual gas molecule
Has the following attributes:
self.position -> The particle's position (Position)
self.velocity -> The particle's velocity (Velocity)
self.mass -> The particle's mass (float)
self.radius - > The particle's radius (float)
"""
def __init__(self, initial_position, initial_velocity, mass, radius):
"""
Initialisation arguments:
initial_position - Position- or array-like type object representing the particle's initial position
initial_velocity - Velocity- or array-like type object representing the particle's initial velocity
mass - float or int type value representing the particle's mass
radius - float or int type value representing the particle's radius
"""
if type(initial_position) == Position:
self.position = initial_position
else:
self.position = Position(initial_position)
if type(initial_velocity) == Velocity:
self.velocity = initial_velocity
else:
self.velocity = Velocity(initial_velocity)
self.mass = mass
self.radius = radius
def __repr__(self):
return '<Position: {}, Velocity: {}, Mass: {}, Radius: {}>'.format(self.position.components,
self.velocity.components, self.mass, self.radius)
def update(self, time_step):
"""
Updates the particle's position over a given time step
time_step - float or int value representing the time over which to propagate the particle
"""
self.position.propagate(self.velocity, time_step)
def overlap(self, other):
"""
Returns True if the particles are overlapping in space, otherwise returns False
other - Particle type object to check for overlap with
"""
return (self.position - other.position).magnitude() < self.radius + other.radius
def kinetic_energy(self):
"""
Returns the kinetic energy of the particle
"""
return 0.5*self.mass*([email protected])