15 class TrainIdler(Idler):
16 def __init__(self, v):
20 def put_shark(self, s, l):
23 elif self.s[l] == 'X':
29 # does the next stage of a dance
31 shark1 = self.idle_state % 18
33 self.put_shark('^', shark1)
35 self.put_shark('^', 18-shark1)
37 shark2 = ((self.idle_state+4) % 36)/2
39 self.put_shark('<', shark2)
41 self.put_shark('<', 18-shark2)
43 shark3 = ((self.idle_state+7) % 54)/3
45 self.put_shark('>', 9-shark3)
47 self.put_shark('>', 9-(18-shark3))
49 train1 = ((self.idle_state%(18*36)))
51 if train1 > train1_start and train1 < train1_start+(10*2):
53 ptr = i+train1-train1_start-5
54 if ptr >= 0 and ptr < 10: self.s[ptr] = '#'
56 train2 = ((self.idle_state%(18*36)))
58 if train2 > train2_start and train2 < train2_start+(10*2):
60 ptr = i+train2-train2_start-5
61 if ptr >= 0 and ptr < 10: self.s[9-ptr] = '#'
63 train3 = ((self.idle_state%(18*36)))
65 if train3 > train3_start and train3 < train3_start+(10*2):
67 ptr = i+train3-train3_start-10
68 if ptr >= 0 and ptr < 10: self.s[ptr] = '-'
70 self.v.display(string.join(self.s, ''))
72 self.idle_state %= 18*36*54
77 class GrayIdler(Idler):
78 def __init__(self, v, one=None, zero=None):
80 self.size = 1 << self.bits
88 output = self.do_next_state()
89 # does the next stage of a dance
91 output = string.replace(output, "0", self.zero)
93 output = string.replace(output, "1", self.one)
94 self.v.display(" %8.8s " % (output))
95 self.i = (self.i + 1) % self.size
97 def do_next_state(self):
98 self.grayCode = self.i ^ (self.i >> 1)
99 output = self.dec2bin(self.grayCode)
101 return "0"*(self.bits-len(output))+output
104 def dec2bin(self,num):
105 """Convert long/integer number to binary string.
107 E.g. dec2bin(12) ==> '1100'.
109 from http://starship.python.net/~gherman/playground/decbingray/decbingray.py"""
111 assert num >= 0, "Decimal number must be >= 0!"
113 # Gracefully handle degenerate case.
114 # (Not really needed, but anyway.)
118 # Find highest value bit.
121 val, j = val*2L, j+1L