def __init__(self, client=None, axisName='x'):
if isinstance(client, str):
raise GraphException(
'Client must be a PlotStream, Stream, or None')
self._client = None
self._label = None
self.client = client
self.axisName = axisName
self.minValue = None
self.maxValue = None
def remapQuarterLength(self, x):
'''
Remap a quarter length as its log2. Essentially it's
just math.log2(x), but x=0 is replaced with self.graceNoteQL.
'''
if x == 0: # grace note
x = self.graceNoteQL
try:
return math.log2(float(x))
except ValueError: # pragma: no cover
raise GraphException('cannot take log of x value: %s' % x)
