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Commit650323a

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In SecondaryAxis.set_functions, reuse _set_scale's parent scale caching.
_set_scale checks whether the parent scale changed before modifying thesecondary scale. set_functions should do the same. See added test forpreviously failing case.
1 parentb53418e commit650323a

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2 files changed

+11
-17
lines changed

2 files changed

+11
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lines changed

‎lib/matplotlib/axes/_secondary_axes.py

Lines changed: 1 addition & 17 deletions
Original file line numberDiff line numberDiff line change
@@ -215,23 +215,7 @@ def set_functions(self, functions):
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If a transform is supplied, then the transform must have an
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inverse.
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"""
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ifself._orientation=='x':
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set_scale=self.set_xscale
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parent_scale=self._parent.get_xscale()
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else:
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set_scale=self.set_yscale
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parent_scale=self._parent.get_yscale()
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# we need to use a modified scale so the scale can receive the
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# transform. Only types supported are linear and log10 for now.
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# Probably possible to add other transforms as a todo...
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ifparent_scale=='log':
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defscale='functionlog'
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else:
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defscale='function'
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if (isinstance(functions,tuple)andlen(functions)==2and
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callable(functions[0])andcallable(functions[1])):
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# make an arbitrary convert from a two-tuple of functions
@@ -244,7 +228,7 @@ def set_functions(self, functions):
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'must be a two-tuple of callable functions '
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'with the first function being the transform '
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'and the second being the inverse')
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set_scale(defscale,functions=self._functions)
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self._set_scale()
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defdraw(self,renderer=None,inframe=False):
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"""

‎lib/matplotlib/tests/test_axes.py

Lines changed: 10 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -6135,6 +6135,16 @@ def invert(x):
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mticker.NullLocator)
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deftest_secondary_formatter():
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fig,ax=plt.subplots()
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ax.set_xscale("log")
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secax=ax.secondary_xaxis("top")
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secax.xaxis.set_major_formatter(mticker.ScalarFormatter())
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fig.canvas.draw()
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assertisinstance(
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secax.xaxis.get_major_formatter(),mticker.ScalarFormatter)
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defcolor_boxes(fig,axs):
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"""
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Helper for the tests below that test the extents of various axes elements

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