# How to understand a code to calculate fluxes

I am unable to understand how this code work. Where window is a line with two points. Window is where we calculate the flux. I want to understand how exactly the code is working

``````times = np.zeros((len(x)), dtype=int)

center_x, center_y = 0.5 * (window.point1 + window.point2),                          0.5 * (window.point1 + window.point2)
safety_value = 3.0
radius = safety_value * 0.5 * (math.sqrt((window.point1 - window.point2)**2 +                               (window.point1 - window.point2)**2))

i = 1
while (i < len(x)-1):

if (left_boarder <= x[i] <= right_boarder) and         (x[i] > x[i-1]) and         np.sign(window.perpendicular_distance_unnormalized(x[i], y[i])) !=         np.sign(window.perpendicular_distance_unnormalized(x[i-1], y[i-1])) and         window.is_point_on_segment(x[i], y[i]) and         window.is_point_on_segment(x[i-1], y[i-1]):

times[i] += 1
i += 1

else:
i += 1

return times
``````

``````result = 0

for i in range(y_min, y_max):
result += UX[x_, i]

return result

def calculate_vel_fluxes(ux, windows):
vel_fluxes = np.empty((len(windows), ux.shape))
for i in range(len(windows)):
for j in range(ux.shape):
vel_fluxes[i, j] = uFlux(ux[j], windows[i])
return vel_fluxes
``````