hacks/python-playback/ratio.py

   1 # Class to describe a Ratio, and a collection of common
   2 # (and not-so-common) film ratios collected from Wikipedia.
   3
   4 class Ratio:
   5     def __init__(self, ratio, nickname = None):
   6         self.nickname = nickname
   7         self.ratio = ratio
   8
   9     # @return presentation name of this ratio
  10     def name(self):
  11         if self.nickname is not None:
  12             return "%.2f (%s)" % (self.ratio, self.nickname)
  13
  14         return "%.2f" % self.ratio
  15
  16 ratios = []
  17 ratios.append(Ratio(1.33, '4:3'))
  18 ratios.append(Ratio(1.37, 'Academy'))
  19 ratios.append(Ratio(1.78, '16:9'))
  20 ratios.append(Ratio(1.85, 'Flat / widescreen'))
  21 ratios.append(Ratio(2.39, 'CinemaScope / Panavision'))
  22 ratios.append(Ratio(1.15, 'Movietone'))
  23 ratios.append(Ratio(1.43, 'IMAX'))
  24 ratios.append(Ratio(1.5))
  25 ratios.append(Ratio(1.56, '14:9'))
  26 ratios.append(Ratio(1.6, '16:10'))
  27 ratios.append(Ratio(1.67))
  28 ratios.append(Ratio(2, 'SuperScope'))
  29 ratios.append(Ratio(2.2, 'Todd-AO'))
  30 ratios.append(Ratio(2.35, 'Early CinemaScope / Panavision'))
  31 ratios.append(Ratio(2.37, '21:9'))
  32 ratios.append(Ratio(2.55, 'CinemaScope 55'))
  33 ratios.append(Ratio(2.59, 'Cinerama'))
  34 ratios.append(Ratio(2.76, 'Ultra Panavision'))
  35 ratios.append(Ratio(2.93, 'MGM Camera 65'))
  36 ratios.append(Ratio(4, 'Polyvision'))
  37
  38 # Find a Ratio object from a fractional ratio
  39 def find(ratio):
  40     for r in ratios:
  41         if r.ratio == ratio:
  42             return r
  43
  44     return None
  45
  46 # @return the ith ratio
  47 def index_to_ratio(i):
  48     return ratios[i]
  49
  50 # @return the index within the ratios list of a given fractional ratio
  51 def ratio_to_index(r):
  52     for i in range(0, len(ratios)):
  53         if ratios[i].ratio == r:
  54             return i
  55
  56     return None