util.py 文件源码

def matplotlib_locator_formatter(timedelta, span=1):
    """
    Compute appropriate locator and formatter for renderers
    based on matplotlib, depending on designated time span.
    """
    from matplotlib.dates import date_ticker_factory, DateFormatter
    locator, formatter = date_ticker_factory(span)

    # http://pandas.pydata.org/pandas-docs/stable/timedeltas.html
    # https://stackoverflow.com/questions/16103238/pandas-timedelta-in-days
    is_macro = timedelta <= Timedelta(days=1)
    is_supermacro = timedelta <= Timedelta(minutes=5)

    if is_macro:
        #formatter = DateFormatter(fmt='%H:%M:%S.%f')
        formatter = DateFormatter(fmt='%H:%M')

    if is_supermacro:
        formatter = DateFormatter(fmt='%H:%M:%S')

        # Formatter overrides
        #if formatter.fmt == '%H:%M\n%b %d':
        #    formatter = DateFormatter(fmt='%Y-%m-%d %H:%M')

    # Labs
    #from matplotlib.dates import AutoDateLocator, AutoDateFormatter, HOURLY
    #locator = AutoDateLocator(maxticks=7)
    #locator.autoscale()
    #locator.intervald[HOURLY] = [5]
    #formatter = AutoDateFormatter(breaks)
    #formatter = date_format('%Y-%m-%d\n%H:%M')

    # Default building blocks
    #from matplotlib.dates import AutoDateFormatter, AutoDateLocator
    #locator = AutoDateLocator()
    #formatter = AutoDateFormatter(locator)

    return locator, formatter