--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/DataTypes/dmx.py	Wed Jul 03 09:37:57 2002 +0000
@@ -0,0 +1,31 @@
+
+class DMX(list):
+    """the signal that goes on a real-life dmx wire. it's up to 512
+    un-named channels each with a 8-bit value on each channel. this type
+    is useful for a DMXOut node or DMXLevelDisplay node. the channels are
+    stored in a python list where the first channel is at index 0. the
+    first channel in dmx terminology would be called channel 1."""
+    
+    def __init__(self,dmxlevels):
+        if len(dmxlevels)>512:
+            raise TypeError("DMX objects can't have more than 512 channels")
+        list.extend(dmxlevels) # list.__init__ did't work right
+
+    def append(self,level):
+        if len(self)==512:
+            raise TypeError("DMX objects can't have more than 512 channels")
+        list.append(self,level)
+
+    def extend(self,levels):
+        if len(self)+len(levels)>512:
+            raise TypeError("DMX objects can't have more than 512 channels")
+        list.extend(self,levels)
+
+    def __setslice__(self,i,j,seq):
+        newlength = len(self)-(max(0,j)-max(0,i))+len(seq)
+        # we could check if newlength>512, but any length-changing slice is
+        # probably wrong for this datatype
+        if newlength!=len(self):
+            raise NotImplementedError("Different-length setslice would disturb DMX channels")
+        list.__setslice__(self,i,j,seq)
+