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Better label rotation #1475

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Better label rotation #1475

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fb67995
Improved the rotation of gridline labels
stefraynaud Feb 18, 2020
e6f762e
Fix copyright year
stefraynaud Feb 24, 2020
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21 changes: 18 additions & 3 deletions lib/cartopy/mpl/gridliner.py
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Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
# (C) British Crown Copyright 2011 - 2019, Met Office
# (C) British Crown Copyright 2011 - 2020, Met Office
#
# This file is part of cartopy.
#
Expand Down Expand Up @@ -639,8 +639,23 @@ def _segment_angle_to_text_specs(self, angle, lonlat):
else matplotlib.rc_params['xtick.major.pad'])
ypadding = (self.ypadding if self.ypadding is not None
else matplotlib.rc_params['ytick.major.pad'])
dx = ypadding * np.cos(angle * np.pi / 180)
dy = xpadding * np.sin(angle * np.pi / 180)

angle = ((angle+180) % 360 - 180) * np.pi / 180
tangle = np.tan(angle)
cangle = np.arctan2(xpadding, ypadding)
if abs(angle) < cangle: # right
dx = ypadding
dy = dx * tangle
elif abs(angle) > (np.pi - cangle): # left
dx = -ypadding
dy = dx * tangle
elif angle >= cangle: # top
dy = xpadding
dx = dy / tangle
else: # bottom
dy = -xpadding
dx = dy / tangle

transform = mtrans.offset_copy(
self.axes.transData, self.axes.figure,
x=dx, y=dy, units='dots')
Expand Down
2 changes: 1 addition & 1 deletion lib/cartopy/tests/mpl/test_gridliner.py
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Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
# (C) British Crown Copyright 2011 - 2019, Met Office
# (C) British Crown Copyright 2011 - 2020, Met Office
#
# This file is part of cartopy.
#
Expand Down