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from dataclasses import dataclass
from universe import Universe
from body import Body
from rocket import Rocket
@dataclass
class Simulation_Snapshot:
universe: type[Universe]
body: type[Body]
rocket: type[Rocket]
class Simulation():
def __init__(self, universe: type[Universe], body: type[Body], rocket: type[Rocket]):
self.ticks = 0
self.time = 0
self.universe = universe
self.body = body
self.rocket = rocket
self.y = 0
self.speed_y = 0
self.acceleration_y = 0
#simulation logic
def tick(self, delta: int) -> None:
current_stage = self.rocket.current_stage()
#calculate upwards force by fuel
fuel_used = current_stage.total_fuel_used(delta)
if current_stage.fuel_mass < fuel_used:
fuel_used = current_stage.fuel_mass
current_stage.fuel_mass -= fuel_used
print("Fuel remaining: " + str(current_stage.fuel_mass))
#upwards_force = fuel_used * self.rocket.fuel_type.energy_density #we should calculate thrust based on this
upwards_force = 0
if fuel_used > 0:
upwards_force = current_stage.current_thrust()
print("Upwards force: " + str(upwards_force))
print("g: " + str(self.body.g(G=self.universe.G, height=self.y)))
#calculate downwards force by drag and gravity
gravitational_force = self.body.g(G=self.universe.G, height=self.y) * self.rocket.total_mass()
print("Gravity: " + str(gravitational_force))
print("BODY MASS: " + str(self.body.mass()))
print("ROCKET TOTAL MASS: " + str(self.rocket.total_mass()))
print("Atmosphere density: " + str(self.body.atmosphere.density_at_height(self.y, self.body.g(G=self.universe.G, height=self.y))))
#https://www.grc.nasa.gov/www/k-12/airplane/drageq.html
drag_force = (1/2) * self.body.atmosphere.density_at_height(self.y, self.body.g(G=self.universe.G, height=self.y)) * (self.speed_y ** 2) * self.rocket.s_drag_coefficient() * self.rocket.s_cross_sectional_area()
#drag goes against speed
if self.speed_y < 0:
drag_force *= -1
print("Drag: " + str(drag_force))
downwards_force = gravitational_force + drag_force #shouldnt delta influence, TODO: WAIT DRAG COULD BE POSITIVE OR NEGATIVE
print("Downwards force: " + str(downwards_force))
#update velocity based on resultant force
total_force = upwards_force - downwards_force
print("Total force: " + str(total_force))
self.acceleration_y = total_force / self.rocket.total_mass() #mayb we need momentum??
print("Acceleration: " + str(self.acceleration_y))
self.speed_y = self.speed_y + (self.acceleration_y * delta) #i think thir swrong
#update position based on velocity and delta
self.y += self.speed_y * delta
if self.y < 0:
self.y = 0
self.speed_y = 0
print("Speed: " + str(self.speed_y))
print("Height: " + str(self.y))
print("Total Simulation Time: " + str(self.time))
print("")
self.ticks += 1
self.time += delta
def snapshot(self) -> Simulation_Snapshot:
return Simulation_Snapshot(self.universe, self.body, self.rocket)
def str_snapshot(self) -> str:
return str(self.universe) + "\n" + \
str(self.body) + "\n" + \
str(self.rocket)
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