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Allow to not draw the labels on pie chart #11806

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Merged
merged 3 commits into from
Jan 1, 2019
Merged

Allow to not draw the labels on pie chart #11806

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6e7bfef
Allow to not draw the labels on pie chart.
Carreau Aug 2, 2018
eb3cf4f
add test
Carreau Aug 2, 2018
0a1e5a4
TST: image fix
jklymak Aug 18, 2018
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42 changes: 23 additions & 19 deletions lib/matplotlib/axes/_axes.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2735,8 +2735,10 @@ def pie(self, x, explode=None, labels=None, colors=None,
shadow : bool, optional, default: False
Draw a shadow beneath the pie.

labeldistance : float, optional, default: 1.1
The radial distance at which the pie labels are drawn
labeldistance : float or None, optional, default: 1.1
The radial distance at which the pie labels are drawn.
If set to ``None``, label are not drawn, but are stored for use in
``legend()``

startangle : float, optional, default: None
If not *None*, rotates the start of the pie chart by *angle*
Expand Down Expand Up @@ -2858,23 +2860,25 @@ def get_next_color():
shad.set_label('_nolegend_')
self.add_patch(shad)

xt = x + labeldistance * radius * math.cos(thetam)
yt = y + labeldistance * radius * math.sin(thetam)
label_alignment_h = xt > 0 and 'left' or 'right'
label_alignment_v = 'center'
label_rotation = 'horizontal'
if rotatelabels:
label_alignment_v = yt > 0 and 'bottom' or 'top'
label_rotation = np.rad2deg(thetam) + (0 if xt > 0 else 180)
props = dict(horizontalalignment=label_alignment_h,
verticalalignment=label_alignment_v,
rotation=label_rotation,
size=rcParams['xtick.labelsize'])
props.update(textprops)

t = self.text(xt, yt, label, **props)

texts.append(t)
if labeldistance is not None:
xt = x + labeldistance * radius * math.cos(thetam)
yt = y + labeldistance * radius * math.sin(thetam)
label_alignment_h = xt > 0 and 'left' or 'right'
label_alignment_v = 'center'
label_rotation = 'horizontal'
if rotatelabels:
label_alignment_v = yt > 0 and 'bottom' or 'top'
label_rotation = np.rad2deg(thetam) + (0 if xt > 0
else 180)
props = dict(horizontalalignment=label_alignment_h,
verticalalignment=label_alignment_v,
rotation=label_rotation,
size=rcParams['xtick.labelsize'])
props.update(textprops)

t = self.text(xt, yt, label, **props)

texts.append(t)

if autopct is not None:
xt = x + pctdistance * radius * math.cos(thetam)
Expand Down
Binary file added lib/matplotlib/tests/baseline_images/test_axes/pie_no_label.png
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14 changes: 14 additions & 0 deletions lib/matplotlib/tests/test_axes.py
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Expand Up @@ -4740,6 +4740,20 @@ def test_pie_rotatelabels_true():
plt.axis('equal')


@image_comparison(baseline_images=['pie_no_label'], extensions=['png'])
def test_pie_nolabel_but_legend():
labels = 'Frogs', 'Hogs', 'Dogs', 'Logs'
sizes = [15, 30, 45, 10]
colors = ['yellowgreen', 'gold', 'lightskyblue', 'lightcoral']
explode = (0, 0.1, 0, 0) # only "explode" the 2nd slice (i.e. 'Hogs')
plt.pie(sizes, explode=explode, labels=labels, colors=colors,
autopct='%1.1f%%', shadow=True, startangle=90, labeldistance=None,
rotatelabels=True)
plt.axis('equal')
plt.ylim(-1.2, 1.2)
plt.legend()


def test_pie_textprops():
data = [23, 34, 45]
labels = ["Long name 1", "Long name 2", "Long name 3"]
Expand Down