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Commitb9df5e7

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Fix default theta tick locations for non-full-circle polar plots.
Currently, non-full-circle polar plots may (depending on the axes size)put theta ticks at positions that make sense for linear plots, but are abit weird for polar plots (e.g. 50° or 25°). Instead, prefer "standard"angles (90°, 45°, 30°, 15°, 10°). For really small axes, there's stilla problem because a single tick may end up at 150°, but fixing themachinery to allow 15° while rejecting 150° would be trickier.(Likewise, really thin slivers likely want ticks at 0.5° steps ratherthan 0.45° :/)
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Default theta tick locations for non-full-circle polar plots have changed
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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For polar plots that don't cover a full circle, the default theta tick
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locations are now at multiples of 10°, 15°, 30°, 45°, 90°, rather than using
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values that mostly make sense for linear plots (20°, 25°, etc.).

‎lib/matplotlib/projections/polar.py

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@@ -390,6 +390,11 @@ def cla(self):
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def_set_scale(self,value,**kwargs):
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super()._set_scale(value,**kwargs)
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ifvalue=="linear":# Should always be the case.
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# LinearScale.set_default_locators_and_formatters just set the
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# major locator to be an AutoLocator, so we customize it here to
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# have ticks at sensible degree multiples.
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self.get_major_locator().set_params(steps=[1,1.5,3,4.5,9,10])
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self._wrap_locator_formatter()
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def_copy_tick_props(self,src,dest):

‎lib/matplotlib/tests/test_polar.py

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@@ -249,6 +249,8 @@ def test_polar_theta_limits():
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direction=DIRECTIONS[i%len(DIRECTIONS)],
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rotation='auto')
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ax.yaxis.set_tick_params(label2On=True,rotation='auto')
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ax.xaxis.get_major_locator().base.set_params(# backcompat
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steps=[1,2,2.5,5,10])
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@check_figures_equal(extensions=["png"])
@@ -357,3 +359,17 @@ def test_thetalim_args():
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asserttuple(np.radians((ax.get_thetamin(),ax.get_thetamax())))== (0,1)
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ax.set_thetalim((2,3))
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asserttuple(np.radians((ax.get_thetamin(),ax.get_thetamax())))== (2,3)
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deftest_default_thetalocator():
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# Ideally we would check AAAABBC, but the smallest axes currently puts a
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# single tick at 150° because MaxNLocator doesn't have a way to accept 15°
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# while rejecting 150°.
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fig,axs=plt.subplot_mosaic(
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"AAAABB.",subplot_kw={"projection":"polar"})
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foraxinaxs.values():
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ax.set_thetalim(0,np.pi)
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foraxinaxs.values():
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ticklocs=np.degrees(ax.xaxis.get_majorticklocs()).tolist()
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assertpytest.approx(90)inticklocs
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assertpytest.approx(100)notinticklocs

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