12 class TrainIdler(Idler):
13 def __init__(self, v):
17 def put_shark(self, s, l):
20 elif self.s[l] == 'X':
26 # does the next stage of a dance
28 shark1 = self.idle_state % 18
30 self.put_shark('^', shark1)
32 self.put_shark('^', 18-shark1)
34 shark2 = ((self.idle_state+4) % 36)/2
36 self.put_shark('<', shark2)
38 self.put_shark('<', 18-shark2)
40 shark3 = ((self.idle_state+7) % 54)/3
42 self.put_shark('>', 9-shark3)
44 self.put_shark('>', 9-(18-shark3))
46 train1 = ((self.idle_state%(18*36)))
48 if train1 > train1_start and train1 < train1_start+(10*2):
50 ptr = i+train1-train1_start-5
51 if ptr >= 0 and ptr < 10: self.s[ptr] = '#'
53 train2 = ((self.idle_state%(18*36)))
55 if train2 > train2_start and train2 < train2_start+(10*2):
57 ptr = i+train2-train2_start-5
58 if ptr >= 0 and ptr < 10: self.s[9-ptr] = '#'
60 train3 = ((self.idle_state%(18*36)))
62 if train3 > train3_start and train3 < train3_start+(10*2):
64 ptr = i+train3-train3_start-10
65 if ptr >= 0 and ptr < 10: self.s[ptr] = '-'
67 self.v.display(string.join(self.s, ''))
69 self.idle_state %= 18*36*54
71 class GrayIdler(Idler):
72 def __init__(self, v, one=None, zero=None):
74 self.size = 1 << self.bits
82 output = self.do_next_state()
83 # does the next stage of a dance
85 output = string.replace(output, "0", self.zero)
87 output = string.replace(output, "1", self.one)
88 self.v.display(" %8.8s " % (output))
89 self.i = (self.i + 1) % self.size
91 def do_next_state(self):
92 self.grayCode = self.i ^ (self.i >> 1)
93 output = self.dec2bin(self.grayCode)
95 return "0"*(self.bits-len(output))+output
98 def dec2bin(self,num):
99 """Convert long/integer number to binary string.
101 E.g. dec2bin(12) ==> '1100'.
103 from http://starship.python.net/~gherman/playground/decbingray/decbingray.py"""
105 assert num >= 0, "Decimal number must be >= 0!"
107 # Gracefully handle degenerate case.
108 # (Not really needed, but anyway.)
112 # Find highest value bit.
115 val, j = val*2L, j+1L