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FIX: quiver key pivot location #5620

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Merged
merged 1 commit into from
Dec 5, 2015
Merged

FIX: quiver key pivot location #5620

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6 changes: 5 additions & 1 deletion lib/matplotlib/quiver.py
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Original file line number Diff line number Diff line change
Expand Up @@ -228,7 +228,7 @@ class QuiverKey(martist.Artist):
""" Labelled arrow for use as a quiver plot scale key."""
halign = {'N': 'center', 'S': 'center', 'E': 'left', 'W': 'right'}
valign = {'N': 'bottom', 'S': 'top', 'E': 'center', 'W': 'center'}
pivot = {'N': 'mid', 'S': 'mid', 'E': 'tip', 'W': 'tail'}
pivot = {'N': 'middle', 'S': 'middle', 'E': 'tip', 'W': 'tail'}

def __init__(self, Q, X, Y, U, label, **kw):
martist.Artist.__init__(self)
Expand Down Expand Up @@ -708,6 +708,10 @@ def _h_arrows(self, length):
X = X - X[:, 3, np.newaxis] # numpy bug? using -= does not
# work here unless we multiply
# by a float first, as with 'mid'.
elif self.pivot != 'tail':
raise ValueError(("Quiver.pivot must have value in {{'middle', "
"'tip', 'tail'}} not {}").format(self.pivot))

tooshort = length < self.minlength
if tooshort.any():
# Use a heptagonal dot:
Expand Down
Binary file added lib/matplotlib/tests/baseline_images/test_quiver/quiver_key_pivot.png
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16 changes: 16 additions & 0 deletions lib/matplotlib/tests/test_quiver.py
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Expand Up @@ -92,6 +92,22 @@ def test_quiver_copy():
assert q0.V[0] == 2.0


@image_comparison(baseline_images=['quiver_key_pivot'],
extensions=['png'], remove_text=True)
def test_quiver_key_pivot():
fig, ax = plt.subplots()

u, v = np.mgrid[0:2*np.pi:10j, 0:2*np.pi:10j]

q = ax.quiver(np.sin(u), np.cos(v))
ax.set_xlim(-2, 11)
ax.set_ylim(-2, 11)
ax.quiverkey(q, 0.5, 1, 1, 'N', labelpos='N')
ax.quiverkey(q, 1, 0.5, 1, 'E', labelpos='E')
ax.quiverkey(q, 0.5, 0, 1, 'S', labelpos='S')
ax.quiverkey(q, 0, 0.5, 1, 'W', labelpos='W')


if __name__ == '__main__':
import nose
nose.runmodule()