50 lines
1.5 KiB
Python
50 lines
1.5 KiB
Python
import turtle
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import math
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class SolarSystem:
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def __init__(self, width, height):
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"""
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initializes SolarSystem
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:param width: width of world
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:param height: height of world
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"""
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self.__theSun = None
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self.__planets = []
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self.__screen = turtle.Screen()
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self.__screen.setup(width=950, height=950)
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self.__screen.setworldcoordinates(-width / 2, -height / 2, width / 2, height / 2)
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def move_planets(self):
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G = 0.025
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dt = 0.001
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for p in self.__planets:
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p.moveTo((p.coords[0] + dt * p.velocity[0], p.coords[1] + dt * p.velocity[1]))
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radius_x = self.__theSun.x - p.coords[0]
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radius_y = self.__theSun.y - p.coords[1]
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radius = math.sqrt((radius_x ** 2) + (radius_y ** 2)) # Uses pythagorean theorem to find radius
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acc_x = G * self.__theSun.mass * radius_x / radius ** 3 # I don't know,
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acc_y = G * self.__theSun.mass * radius_y / radius ** 3 # I haven't taken physics
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p.velocity = (p.velocity[0] + dt * acc_x, p.velocity[1] + dt * acc_y)
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def add_sun(self, sun):
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self.__theSun = sun
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def add_planet(self, planet):
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self.__planets.append(planet)
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def remove_planet(self, planet_name):
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for p in self.__planets:
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if p.name == planet_name:
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self.__planets.remove(p)
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def show_planets(self):
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for p in self.__planets:
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print(p)
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def freeze(self):
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self.__screen.exitonclick()
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