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Commit7a29ad1

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Merge pull request#5588 from mdboom/dynamic-ticking
Adjust number of ticks based on length of axis
2 parentsd0e7a36 +eafa79b commit7a29ad1

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5 files changed

+55
-3
lines changed

5 files changed

+55
-3
lines changed

‎lib/matplotlib/axis.py

Lines changed: 32 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -654,6 +654,7 @@ def __init__(self, axes, pickradius=15):
654654
# Initialize here for testing; later add API
655655
self._major_tick_kw=dict()
656656
self._minor_tick_kw=dict()
657+
self._tick_space=None
657658

658659
self.cla()
659660
self._set_scale('linear')
@@ -785,6 +786,7 @@ def set_tick_params(self, which='major', reset=False, **kw):
785786
fortickinself.minorTicks:
786787
tick._apply_params(**self._minor_tick_kw)
787788
self.stale=True
789+
self._tick_space=None
788790

789791
@staticmethod
790792
def_translate_tick_kw(kw,to_init_kw=True):
@@ -1665,6 +1667,13 @@ def axis_date(self, tz=None):
16651667
tz=pytz.timezone(tz)
16661668
self.update_units(datetime.datetime(2009,1,1,0,0,0,0,tz))
16671669

1670+
defget_tick_space(self):
1671+
"""
1672+
Return the estimated number of ticks that can fit on the axis.
1673+
"""
1674+
# Must be overridden in the subclass
1675+
raiseNotImplementedError()
1676+
16681677

16691678
classXAxis(Axis):
16701679
__name__='xaxis'
@@ -1988,6 +1997,18 @@ def set_default_intervals(self):
19881997
self.axes.viewLim.intervalx=xmin,xmax
19891998
self.stale=True
19901999

2000+
defget_tick_space(self):
2001+
ifself._tick_spaceisNone:
2002+
ends=self.axes.transAxes.transform([[0,0], [1,0]])
2003+
length= ((ends[1][0]-ends[0][0])/self.axes.figure.dpi)*72.0
2004+
tick=self._get_tick(True)
2005+
# There is a heuristic here that the aspect ratio of tick text
2006+
# is no more than 3:1
2007+
size=tick.label1.get_size()*3
2008+
size*=np.cos(np.deg2rad(tick.label1.get_rotation()))
2009+
self._tick_space=np.floor(length/size)
2010+
returnself._tick_space
2011+
19912012

19922013
classYAxis(Axis):
19932014
__name__='yaxis'
@@ -2318,3 +2339,14 @@ def set_default_intervals(self):
23182339
ifnotviewMutated:
23192340
self.axes.viewLim.intervaly=ymin,ymax
23202341
self.stale=True
2342+
2343+
defget_tick_space(self):
2344+
ifself._tick_spaceisNone:
2345+
ends=self.axes.transAxes.transform([[0,0], [0,1]])
2346+
length= ((ends[1][1]-ends[0][1])/self.axes.figure.dpi)*72.0
2347+
tick=self._get_tick(True)
2348+
# Having a spacing of at least 2 just looks good.
2349+
size=tick.label1.get_size()*2.0
2350+
size*=np.cos(np.deg2rad(tick.label1.get_rotation()))
2351+
self._tick_space=np.floor(length/size)
2352+
returnself._tick_space

‎lib/matplotlib/tests/test_axes.py

Lines changed: 6 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -4191,6 +4191,12 @@ def test_axes_margins():
41914191
assertax.get_ybound()== (-0.5,9.5)
41924192

41934193

4194+
@image_comparison(baseline_images=["auto_numticks"],style='default',
4195+
extensions=['png'])
4196+
deftest_auto_numticks():
4197+
fig,axes=plt.subplots(4,4)
4198+
4199+
41944200
if__name__=='__main__':
41954201
importnose
41964202
importsys

‎lib/matplotlib/ticker.py

Lines changed: 17 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -202,6 +202,10 @@ def get_data_interval(self):
202202
defset_data_interval(self,vmin,vmax):
203203
self.dataLim.intervalx=vmin,vmax
204204

205+
defget_tick_space(self):
206+
# Just use the long-standing default of nbins==9
207+
return9
208+
205209

206210
classTickHelper(object):
207211
axis=None
@@ -1349,7 +1353,9 @@ def __init__(self, *args, **kwargs):
13491353
Keyword args:
13501354
13511355
*nbins*
1352-
Maximum number of intervals; one less than max number of ticks.
1356+
Maximum number of intervals; one less than max number of
1357+
ticks. If the string `'auto'`, the number of bins will be
1358+
automatically determined based on the length of the axis.
13531359
13541360
*steps*
13551361
Sequence of nice numbers starting with 1 and ending with 10;
@@ -1387,7 +1393,9 @@ def __init__(self, *args, **kwargs):
13871393
defset_params(self,**kwargs):
13881394
"""Set parameters within this locator."""
13891395
if'nbins'inkwargs:
1390-
self._nbins=int(kwargs['nbins'])
1396+
self._nbins=kwargs['nbins']
1397+
ifself._nbins!='auto':
1398+
self._nbins=int(self._nbins)
13911399
if'trim'inkwargs:
13921400
self._trim=kwargs['trim']
13931401
if'integer'inkwargs:
@@ -1416,6 +1424,8 @@ def set_params(self, **kwargs):
14161424

14171425
defbin_boundaries(self,vmin,vmax):
14181426
nbins=self._nbins
1427+
ifnbins=='auto':
1428+
nbins=self.axis.get_tick_space()
14191429
scale,offset=scale_range(vmin,vmax,nbins)
14201430
ifself._integer:
14211431
scale=max(1,scale)
@@ -1901,7 +1911,11 @@ def tick_values(self, vmin, vmax):
19011911

19021912
classAutoLocator(MaxNLocator):
19031913
def__init__(self):
1904-
MaxNLocator.__init__(self,nbins=9,steps=[1,2,5,10])
1914+
ifrcParams['_internal.classic_mode']:
1915+
nbins=9
1916+
else:
1917+
nbins='auto'
1918+
MaxNLocator.__init__(self,nbins=nbins,steps=[1,2,5,10])
19051919

19061920

19071921
classAutoMinorLocator(Locator):

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