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0
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1
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2 class DMX(list):
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3 """the signal that goes on a real-life dmx wire. it's up to 512
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4 un-named channels each with a 8-bit value on each channel. this type
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5 is useful for a DMXOut node or DMXLevelDisplay node. the channels are
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6 stored in a python list where the first channel is at index 0. the
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7 first channel in dmx terminology would be called channel 1."""
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8
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9 def __init__(self,dmxlevels):
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10 if len(dmxlevels)>512:
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11 raise TypeError("DMX objects can't have more than 512 channels")
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12 list.extend(dmxlevels) # list.__init__ did't work right
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13
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14 def append(self,level):
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15 if len(self)==512:
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16 raise TypeError("DMX objects can't have more than 512 channels")
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17 list.append(self,level)
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18
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19 def extend(self,levels):
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20 if len(self)+len(levels)>512:
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21 raise TypeError("DMX objects can't have more than 512 channels")
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22 list.extend(self,levels)
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23
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24 def __setslice__(self,i,j,seq):
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25 newlength = len(self)-(max(0,j)-max(0,i))+len(seq)
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26 # we could check if newlength>512, but any length-changing slice is
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27 # probably wrong for this datatype
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28 if newlength!=len(self):
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29 raise NotImplementedError("Different-length setslice would disturb DMX channels")
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30 list.__setslice__(self,i,j,seq)
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31
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