86 lines
2.8 KiB
Python
86 lines
2.8 KiB
Python
"""UnitDblConverter module containing class UnitDblConverter."""
|
|
|
|
import numpy as np
|
|
|
|
from matplotlib import cbook, units
|
|
import matplotlib.projections.polar as polar
|
|
|
|
__all__ = ['UnitDblConverter']
|
|
|
|
|
|
# A special function for use with the matplotlib FuncFormatter class
|
|
# for formatting axes with radian units.
|
|
# This was copied from matplotlib example code.
|
|
def rad_fn(x, pos=None):
|
|
"""Radian function formatter."""
|
|
n = int((x / np.pi) * 2.0 + 0.25)
|
|
if n == 0:
|
|
return str(x)
|
|
elif n == 1:
|
|
return r'$\pi/2$'
|
|
elif n == 2:
|
|
return r'$\pi$'
|
|
elif n % 2 == 0:
|
|
return fr'${n//2}\pi$'
|
|
else:
|
|
return fr'${n}\pi/2$'
|
|
|
|
|
|
class UnitDblConverter(units.ConversionInterface):
|
|
"""
|
|
Provides Matplotlib conversion functionality for the Monte UnitDbl class.
|
|
"""
|
|
# default for plotting
|
|
defaults = {
|
|
"distance": 'km',
|
|
"angle": 'deg',
|
|
"time": 'sec',
|
|
}
|
|
|
|
@staticmethod
|
|
def axisinfo(unit, axis):
|
|
# docstring inherited
|
|
|
|
# Delay-load due to circular dependencies.
|
|
import matplotlib.testing.jpl_units as U
|
|
|
|
# Check to see if the value used for units is a string unit value
|
|
# or an actual instance of a UnitDbl so that we can use the unit
|
|
# value for the default axis label value.
|
|
if unit:
|
|
label = unit if isinstance(unit, str) else unit.label()
|
|
else:
|
|
label = None
|
|
|
|
if label == "deg" and isinstance(axis.axes, polar.PolarAxes):
|
|
# If we want degrees for a polar plot, use the PolarPlotFormatter
|
|
majfmt = polar.PolarAxes.ThetaFormatter()
|
|
else:
|
|
majfmt = U.UnitDblFormatter(useOffset=False)
|
|
|
|
return units.AxisInfo(majfmt=majfmt, label=label)
|
|
|
|
@staticmethod
|
|
def convert(value, unit, axis):
|
|
# docstring inherited
|
|
if not cbook.is_scalar_or_string(value):
|
|
return [UnitDblConverter.convert(x, unit, axis) for x in value]
|
|
# If no units were specified, then get the default units to use.
|
|
if unit is None:
|
|
unit = UnitDblConverter.default_units(value, axis)
|
|
# Convert the incoming UnitDbl value/values to float/floats
|
|
if isinstance(axis.axes, polar.PolarAxes) and value.type() == "angle":
|
|
# Guarantee that units are radians for polar plots.
|
|
return value.convert("rad")
|
|
return value.convert(unit)
|
|
|
|
@staticmethod
|
|
def default_units(value, axis):
|
|
# docstring inherited
|
|
# Determine the default units based on the user preferences set for
|
|
# default units when printing a UnitDbl.
|
|
if cbook.is_scalar_or_string(value):
|
|
return UnitDblConverter.defaults[value.type()]
|
|
else:
|
|
return UnitDblConverter.default_units(value[0], axis)
|