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AutoDateFormatter: More customizable formatting #2507

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AutoDateFormatter: More customizable formatting #2507

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bf05ae4
AutoDateFormatter: More customizable formatting
megies Oct 9, 2013
3036d9f
Make the example more canonical by staying with classes already defined
megies Oct 9, 2013
89518d5
fixing py3/2 compatibility, use `six`
megies Oct 9, 2013
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33 changes: 27 additions & 6 deletions lib/matplotlib/dates.py
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Original file line number Diff line number Diff line change
Expand Up @@ -505,9 +505,25 @@ class AutoDateFormatter(ticker.Formatter):
dictionary by doing::


formatter = AutoDateFormatter()
formatter.scaled[1/(24.*60.)] = '%M:%S' # only show min and sec

>>> formatter = AutoDateFormatter()
>>> formatter.scaled[1/(24.*60.)] = '%M:%S' # only show min and sec

Custom `FunctionFormatter`s can also be used. The following example shows
how to use a custom format function to strip trailing zeros from decimal
seconds and adds the date to the first ticklabel::

>>> def my_format_function(x, pos=None):
... x = matplotlib.dates.num2date(x)
... if pos == 0:
... fmt = '%D %H:%M:%S.%f'
... else:
... fmt = '%H:%M:%S.%f'
... label = x.strftime(fmt)
... label = label.rstrip("0")
... label = label.rstrip(".")
... return label
>>> from matplotlib.ticker import FuncFormatter
>>> formatter.scaled[1/(24.*60.)] = FuncFormatter(my_format_function)
"""

# This can be improved by providing some user-level direction on
Expand Down Expand Up @@ -536,7 +552,7 @@ def __init__(self, locator, tz=None, defaultfmt='%Y-%m-%d'):
1. / 24.: '%H:%M:%S',
1. / (24. * 60.): '%H:%M:%S.%f'}

def __call__(self, x, pos=0):
def __call__(self, x, pos=None):
scale = float(self._locator._get_unit())
fmt = self.defaultfmt

Expand All @@ -545,8 +561,13 @@ def __call__(self, x, pos=0):
fmt = self.scaled[k]
break

self._formatter = DateFormatter(fmt, self._tz)
return self._formatter(x, pos)
if isinstance(fmt, six.string_types):
self._formatter = DateFormatter(fmt, self._tz)
return self._formatter(x, pos)
elif six.callable(fmt):
return fmt(x, pos)
else:
raise NotImplementedError()
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This should probably raise a more descriptive error.



class rrulewrapper:
Expand Down