def __init__ (self, world, density, radius, centre, dist, angle): if self.img_ident == 'planet': self.img_ident += str(randrange(3)) self.world = world pos = (centre.pos[0] + dist * cos(angle), centre.pos[1] + dist * sin(angle)) freq = float(conf.GRAVITY_CONSTANT * centre.mass) / dist ** 3 centre = centre.pos def get_pos (dt): x, y = self.pos cx, cy = centre x -= cx y -= cy angle = freq * dt c = cos(angle) s = sin(angle) return (cx + c * x - s * y, cy + s * x + c * y) self.get_pos_at_time = get_pos GravitySource.__init__(self, pos, density * radius ** 3, radius) self.graphic = mk_graphic(self) position_graphic(self)
def __init__ (self, density, radius, pos): GravitySource.__init__(self, pos, density * radius ** 3, radius) self.graphic = mk_graphic(self) position_graphic(self)
