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physical_object.py
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physical_object.py
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from __future__ import print_function, division
from math import isnan
from constants import *
from constants_game import *
from visual import vector, color, sphere
from utils import __
from math import cos, sin, pi
class PhysicalObject(object):
"""Physical Objects in the solar system."""
__all__ = []
__total_time = 0
def __init__(self, mass, radius, pos):
self.mass = float(mass)
self.radius = float(radius)
self.object = None
self.last_trail_at = 0
self.trail_count = 0
self.obj_params = {
"radius": RADIUS_1,
"color": color.white
}
if len(pos) == 1:
self.pos = vector(pos[0], 0, 0)
elif len(pos) == 2:
self.pos = vector(pos[0], pos[1], 0)
else:
self.pos = vector(pos[0], pos[1], pos[2])
self.vel = vector(0, 0, 0)
def print_debug(self):
self.print_debug_movement(newline=False)
print(",\t", end='')
self.print_debug_consts(False)
def print_debug_movement(self, newline=True):
text = "accln: {}, vel: {}, pos: {}".format(self.accln(), self.vel, self.pos)
if newline:
print(text)
else:
print(text, end='')
def print_debug_consts(self, newline=True):
text = "mass: {}, radius: {}, pos: {}".format(self.mass, self.radius, self.pos)
if newline:
print(text)
else:
print(text, end='')
@staticmethod
def count_objects():
# print(len(PhysicalObject.__all__))
return len(PhysicalObject.__all__)
def accln(self):
return self.get_net_force()/self.mass
@staticmethod
def update_bodies(render_updates=True):
updates = []
for item in PhysicalObject.__all__:
net_force = item.get_net_force()
accln = net_force / item.mass
new_vel = item.vel + accln * DELTA_TIME
new_pos = item.pos + item.vel * DELTA_TIME
updates.append({"item": item, "vel": new_vel, "pos": new_pos})
# print(updates[0]['item'].pos - updates[0]['pos'])
for item in updates:
item["item"].vel = item['vel']
item["item"].pos = item['pos']
if render_updates:
item["item"].render_updates()
PhysicalObject.__total_time += DELTA_TIME
@staticmethod
def get_total_time():
return PhysicalObject.__total_time
def get_net_force(self):
net = vector(0, 0, 0)
for body in PhysicalObject.__all__:
if body == self:
continue
else:
this_direction = self.direction_with(body)
this_force_magnitude = self.gravitational_force_magnitude_with(body)
this_force = this_force_magnitude * this_direction
# print("Magnitude is {}".format(this_force_magnitude))
# print("Direction is {}".format(this_direction))
# print("This force is {}".format(this_force))
net += this_force
if isnan(net.mag):
net = 0
return net
def surface_gravity(self):
return G * self.mass / (self.radius * self.radius)
def gravitational_force_magnitude_with(self, body):
return G * self.mass * body.mass / pow(self.distance_with(body), 2)
def distance_with(self, body):
return (body.pos - self.pos).mag
def direction_with(self, body):
m_vector = (body.pos - self.pos)
return m_vector/m_vector.mag
def get_scaled_pos(self):
return __(self.pos[0]), __(self.pos[1]), __(self.pos[2])
def register(self, color=color.orange):
PhysicalObject.__all__.append(self)
#initialize graphical stuffs
if not SHOW_VISUAL: return
scaled_pos = self.get_scaled_pos()
# print("Scaled pos is {}".format(scaled_pos))
self.object = sphere(pos=scaled_pos, radius=self.obj_params['radius'], color=color)
def render_updates(self):
if self.object is None:
return
if abs(self.last_trail_at - PhysicalObject.get_total_time()) > TRAIL_AFTER_TIME:
# if(self.trail_count >= NUM_TRAILS)
sphere(pos=self.object.pos, radius=RADIUS_TRAIL, color=self.object.color)
# print("Trail created")
self.last_trail_at = PhysicalObject.get_total_time()
self.object.pos = self.get_scaled_pos()
class Rocket(PhysicalObject):
def __init__(self, mass, pos):
super(Rocket, self).__init__(mass, 0.1, pos)
self.propulsions =[]
def get_net_force(self):
g_force = super(Rocket, self).get_net_force()
return g_force + self.get_net_propulsion()
def get_net_propulsion(self):
cur_time = PhysicalObject.get_total_time()
for propulsion in self.propulsions:
if propulsion['from'] < cur_time < propulsion['from'] + propulsion['duration']:
print("Propulsion of mag {0:.1f} added. cur vel {1:.1e}".format(propulsion['force'].mag, self.vel.mag))
return propulsion['force']
return vector()
earth = PhysicalObject(MASS_OF_EARTH, RADIUS_OF_EARTH, (DISTANCE_BETWEEN_SUN_AND_EARTH, 0, 0))
earth.vel = vector(0, REVOLUTION_SPEED_OF_EARTH, 0)
sun = PhysicalObject(MASS_OF_SUN, RADIUS_OF_SUN, (0, 0, 0))
MARS_THETA = 1.380646465529
_mars_pos = (DISTANCE_BETWEEN_SUN_AND_MARS*cos(MARS_THETA), DISTANCE_BETWEEN_SUN_AND_MARS*sin(MARS_THETA), 0)
_mars_vel = vector(-REVOLUTION_SPEED_OF_MARS * sin(MARS_THETA), REVOLUTION_SPEED_OF_MARS * cos(MARS_THETA), 0)
mars = PhysicalObject(MASS_OF_MARS, RADIUS_OF_MARS, _mars_pos)
mars.vel = _mars_vel
moon = PhysicalObject(MASS_OF_MOON, RADIUS_OF_MOON, (DISTANCE_BETWEEN_EARTH_AND_MOON + DISTANCE_BETWEEN_SUN_AND_EARTH, 0, 0))
moon.vel = vector(0, REVOLUTION_SPEED_OF_MOON + REVOLUTION_SPEED_OF_EARTH, 0)
rocket = Rocket(1, (DISTANCE_BETWEEN_SUN_AND_EARTH+9999136.2739, 0, 0))
rocket.vel = vector(0, REVOLUTION_SPEED_OF_EARTH + 6319.9, 0)
rocket.propulsions = [
{"force": vector(2, 2), "from":10, "duration": 1800},
{"force": vector(-0.5, -2), "from":16000000, "duration": 1600},
# {"force": vector(-1, -0.5), "from":2776900, "duration":5000},
]
unit_mass = PhysicalObject(1, 1, (0, 0, 0))
unit_mass.vel = vector(0, 0, 0)
moon.obj_params['radius'] = RADIUS_1 * 0.1
earth.obj_params['radius'] = RADIUS_1 * 0.5
mars.obj_params['radius'] = RADIUS_1 * 0.5
rocket.obj_params['radius'] = RADIUS_1 * 0.5
# moon.object.radius = RADIUS_1 / 0.2
# earth.object.radius = RADIUS_1 / 0.2