Interference pattern animation

Lines_interference.py

import numpy as np
import matplotlib.pyplot as pyplot
import matplotlib.animation as animation


pyplot.style.use("dark_background") 
fig, g = pyplot.subplots(figsize=(6,6))
pyplot.subplots_adjust(top = 1.0, left = 0.00, right = 1.0,  bottom = 0.00)


def circ (r, pa) : # Drawing function
 
    # r = Circle size, pa = slide counter
    
    # Coordinates lists
    Ex = []
    Ey = []
    
    ### Circle points equation    
    p = 100 
    for x in range(0,p) : # 
        Ex.append(np.cos(4.0*np.pi/p*x)*r )
        Ey.append(np.sin(4.0*np.pi/p*x)*r )
    ###
    
    ### Line plotting
    
    for mk in range(0, int(len(Ex)/2)) :
        for l in range(5+pa, 15+pa) :
            pyplot.plot( [Ex[mk], Ex[l]/3], [Ey[mk], Ey[l]/3], c = "white", linewidth = 0.3  )
            
    return 
                            

fr = 50 # Number of frames
lim = 0 # Counter


def update(*args) : # Animation function
  
  global lim
  pyplot.clf()
  
  circ(8, lim)
  
  pyplot.grid(False) 
  pyplot.ylim(-10,10) 
  pyplot.xlim(-10,10) 
  
  lim +=1
  
  return()

def init() : # Also part of animation function
    return()

anim = animation.FuncAnimation(fig, update, init_func=init, blit = True, frames=fr, repeat = False) 
                             
sf = "Interference.gif"      
Sname = "C:\\Users\\rober\\Desktop\\_" + sf  
            
anim.save(Sname, writer="imagemagick", fps=14)   # fps = frames per second

# You must have imagemagick installed in you computer :
# https://www.imagemagick.org/script/index.php