10000 Add option to rotate labels in a pie chart (#2304) by txxia · Pull Request #8217 · matplotlib/matplotlib · GitHub
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Add option to rotate labels in a pie chart (#2304) #8217

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Merged
merged 5 commits into from
Mar 11, 2017
Merged

Add option to rotate labels in a pie chart (#2304) #8217

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7b22029
add parameter and test
txxia Feb 27, 2017
bfec115
implemented label rotation
txxia Feb 27, 2017
b7cc70c
pep8 fix
txxia Mar 6, 2017
bd4f207
renamed flag to 'rotatelabels'; fix vertical alignment
txxia Mar 7, 2017
f109ba8
pep8 fix
txxia Mar 8, 2017
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implemented label rotation
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@txxia
txxia committed Mar 6, 2017
commit bfec1150661aae4459a74a400f24c50ffb4470e8
5 changes: 5 additions & 0 deletions lib/matplotlib/axes/_axes.py
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Expand Up @@ -2620,6 +2620,7 @@ def get_next_color():
x, y = center
theta2 = (theta1 + frac) if counterclock else (theta1 - frac)
thetam = 2 * math.pi * 0.5 * (theta1 + theta2)
thetamd = 360 * 0.5 * (theta1 + theta2)
x += expl * math.cos(thetam)
y += expl * math.sin(thetam)

Expand All @@ -2643,11 +2644,15 @@ def get_next_color():
xt = x + labeldistance * radius * math.cos(thetam)
yt = y + labeldistance * radius * math.sin(thetam)
label_alignment = xt > 0 and 'left' or 'right'
label_rotation = 'horizontal'
if labelrotate:
label_rotation = thetamd + (0 if xt > 0 else 180)
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Instead of using thetamd I think it would be better to just use np.rad2deg(thetam)


t = self.text(xt, yt, label,
size=rcParams['xtick.labelsize'],
horizontalalignment=label_alignment,
verticalalignment='center',
rotation=label_rotation,
**textprops)

texts.append(t)
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Binary file added lib/matplotlib/tests/baseline_images/test_axes/pie_labelrotate_true.png
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4 changes: 2 additions & 2 deletions lib/matplotlib/tests/test_axes.py
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Expand Up @@ -4241,8 +4241,8 @@ def test_pie_frame_grid():
# Set aspect ratio to be equal so that pie is drawn as a circle.
plt.axis('equal')

@image_comparison(baseline_images=['pie_ccw_true'], extensions=['png'])
def test_pie_label_rotate():
@image_comparison(baseline_images=['pie_labelrotate_true'], extensions=['png'])
def test_pie_labelrotate_true():
# The slices will be ordered and plotted counter-clockwise.
labels = 'Frogs', 'Hogs', 'Dogs', 'Logs'
sizes = [15, 30, 45, 10]
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