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<h1>units example code: evans_test.py<a class="headerlink" href="#units-example-code-evans-test-py" title="Permalink to this headline">¶</a></h1>

(<a class="reference external" href="../../mpl_examples/units/evans_test.py">Source code</a>, <a class="reference external" href="../../mpl_examples/units/evans_test.png">png</a>, <a class="reference external" href="../../mpl_examples/units/evans_test.hires.png">hires.png</a>, <a class="reference external" href="../../mpl_examples/units/evans_test.pdf">pdf</a>)

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<div class="highlight-python"><div class="highlight"><pre>"""

A mockup "Foo" units class which supports

conversion and different tick formatting depending on the "unit".

Here the "unit" is just a scalar conversion factor, but this example shows mpl is

entirely agnostic to what kind of units client packages use

"""

from matplotlib.cbook import iterable

import matplotlib.units as units

import matplotlib.ticker as ticker

import matplotlib.pyplot as plt

class Foo:

def __init__( self, val, unit=1.0 ):

self.unit = unit

self._val = val * unit

def value( self, unit ):

if unit is None: unit = self.unit

return self._val / unit

class FooConverter:

@staticmethod

def axisinfo(unit, axis):

'return the Foo AxisInfo'

if unit==1.0 or unit==2.0:

return units.AxisInfo(

majloc = ticker.IndexLocator( 8, 0 ),

majfmt = ticker.FormatStrFormatter("VAL: %s"),

label='foo',

)

else:

return None

@staticmethod

def convert(obj, unit, axis):

"""

convert obj using unit. If obj is a sequence, return the

converted sequence

"""

if units.ConversionInterface.is_numlike(obj):

return obj

if iterable(obj):

return [o.value(unit) for o in obj]

else:

return obj.value(unit)

@staticmethod

def default_units(x, axis):

'return the default unit for x or None'

if iterable(x):

for thisx in x:

return thisx.unit

else:

return x.unit

units.registry[Foo] = FooConverter()

# create some Foos

x = []

for val in range( 0, 50, 2 ):

x.append( Foo( val, 1.0 ) )

# and some arbitrary y data

y = [i for i in range( len(x) ) ]

# plot specifying units

fig = plt.figure()

fig.suptitle("Custom units")

fig.subplots_adjust(bottom=0.2)

ax = fig.add_subplot(1,2,2)

ax.plot( x, y, 'o', xunits=2.0 )

for label in ax.get_xticklabels():

label.set_rotation(30)

label.set_ha('right')

ax.set_title("xunits = 2.0")

# plot without specifying units; will use the None branch for axisinfo

ax.set_title('default units')

for label in ax.get_xticklabels():

label.set_rotation(30)

label.set_ha('right')

plt.show()

</pre></div>

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