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Implemented __copy__ in Colormap #8314

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Implemented __copy__ in Colormap #8314

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3ed55f4
Added __copy__ to Colormap
vidursatija Mar 17, 2017
5003047
Updated __copy__ in Colormap
vidursatija Mar 17, 2017
82cccd0
Fixed __copy__ indentation
vidursatija Mar 17, 2017
3ece4cb
Updated __copy__ indentation
vidursatija Mar 17, 2017
7e8a940
Added tests for Colormap copy
vidursatija Mar 19, 2017
5cafb57
Update test_colors.py
vidursatija Mar 19, 2017
3e6a689
Fixed copy test function
vidursatija Mar 19, 2017
f7eadbf
Fixed indentation
vidursatija Mar 19, 2017
eeae70d
Changed copy test
vidursatija Mar 24, 2017
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13 changes: 12 additions & 1 deletion lib/matplotlib/colors.py
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Original file line number Diff line number Diff line change
Expand Up @@ -529,7 +529,18 @@ def __call__(self, X, alpha=None, bytes=False):
if vtype == 'scalar':
rgba = tuple(rgba[0, :])
return rgba


def __copy__(self):
"""Create new object with the same class and update attributes
If object is initialized, copy the elements of _lut list
"""
cls = self.__class__
newCMapObj = cls.__new__(cls)
newCMapObj.__dict__.update(self.__dict__)
if self._isinit:
newCMapObj._lut = np.copy(self._lut)
return newCMapObj

def set_bad(self, color='k', alpha=None):
"""Set color to be used for masked values.
"""
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27 changes: 27 additions & 0 deletions lib/matplotlib/tests/test_colors.py
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Original file line number Diff line number Diff line change
@@ -1,6 +1,7 @@
from __future__ import (absolute_import, division, print_function,
unicode_literals)

import copy
import six
import itertools
import warnings
Expand Down Expand Up @@ -44,6 +45,32 @@ def test_resample():
assert_array_almost_equal(lc3([0, 0.5, 1]), expected)


def test_colormap_copy():
cm = plt.cm.Reds
cm([-1, 0, .5, np.nan, np.inf])
cm.set_bad('y')
cm2 = copy.copy(cm)
cm2.set_bad('b')
cm.set_under('k')
cm2.set_under('r')
cm.set_over('c')
cm2.set_over('m')

expected1 = plt.cm.Reds
expected2 = plt.cm.Reds
expected1([-1, 0, .5, np.nan, np.inf])
expected2([-1, 0, .5, np.nan, np.inf])
expected1.set_bad('y')
expected2.set_bad('b')
expected1.set_under('k')
expected2.set_under('r')
expected1.set_over('c')
expected2.set_over('m')

assert_array_equal(cm._lut, expected1._lut)
assert_array_equal(cm2._lut, expected2._lut)


def test_colormap_endian():
"""
Github issue #1005: a bug in putmask caused erroneous
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