# Last edited on 2021-07-31 13:13:46 by jstolfi

from math import cos, pi

def hann_mesa(x,mrg):
  # Unit window with support {[-1 _ +1]} that decays to 0 
  # wihing {mrg} of the edge..
  xa = abs(x)
  if xa >= 1:
    w = 0.0
  elif xa <= 1-mrg:
    w = 1.0
  else:
    w = 0.5*(1 + cos(pi*(1 - (1 - xa)/mrg)))
  return w
  # ----------------------------------------------------------------------