# Bar.py

from numpy import pi

class Bar():
    def __init__(self, radius:float=0.1, k:float=0.5, h:float=0.0025):
        self.radius:float = radius
        self.k:float = k
        self.h:float = h

        self.update_properties()
    
    def update_properties(self):
        self.area:float = pi*self.radius**2
        self.p: float = 2*pi*self.radius
        self.alpha = ((self.h*self.p)/(self.k*self.area))**0.5

    def set_k(self, k:float):
        self.k = k
        self.update_properties()

def set_k_ratio(ratio: float, bar1:'Bar', bar2:'Bar'):
    '''Sets the value of bar2.k = ratio*bar1.k and updates internal properties'''
    bar2.set_k(bar1.k*ratio)