58 lines
1.4 KiB
Python
58 lines
1.4 KiB
Python
from enum import Enum
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import numpy as np
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from ..units import *
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from .calc import format_sig_figs
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class Body:
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"""
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Base class for any orbital body
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"""
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def __init__(self, X: Position, V: Velocity, m: Mass, name: str = ""):
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"""
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x (position) and v (velocity)
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"""
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self.X = X
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self.V = V
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self.A = Acceleration([0,0,0])
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self.m = m
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self.name = name
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def save(self):
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return (self.X, self.V, self.m)
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@classmethod
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def load(cls, tup):
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return cls(tup[0], tup[1], tup[2])
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def step(self, step_size: float):
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self.X += step_size*self.V
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self.V += step_size*self.A
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self.A = HighPrecisionVector([0,0,0])
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def __str__(self):
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pos = 'm '.join([format_sig_figs(real_pos(x), 3) for x in self.X])
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vel = 'm/s '.join([format_sig_figs(real_vel(v), 3) for v in self.V])
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return str(f"{self.name}: X = {pos}, V = {vel}")
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def E(self):
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return self.ke() + self.pe()
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def pe(self):
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return -self.m/self.dist_from_o()
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def dist_from_o(self):
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return sum([x**2 for x in self.X]).sqrt()
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def ke(self):
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return Decimal(0.5)*self.m*(self._speed()**2)
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def _speed(self):
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return sum([v**2 for v in self.V]).sqrt()
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def speed(self):
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return str(f"{format_sig_figs(real_vel(self._speed),5)}")
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