fix GH #17005

immaxchen · immaxchen · commit bebe02822d84 · 2020-06-06T22:13:09.000+08:00
diff --git a/examples/text_labels_and_annotations/text_rotation_relative_to_line.py b/examples/text_labels_and_annotations/text_rotation_relative_to_line.py
@@ -10,8 +10,8 @@
 to something on the plot.  In this case, the correct angle won't be
 the angle of that object in the plot coordinate system, but the angle
 that that object APPEARS in the screen coordinate system.  This angle
-is found by transforming the angle from the plot to the screen
-coordinate system, as shown in the example below.
+can be provided by the helper parameter `transform_rotates_text`, as
+shown in the example below.
 """
 
 import matplotlib.pyplot as plt
@@ -31,12 +31,12 @@
 
 # Rotate angle
 angle = 45
-trans_angle = ax.transData.transform_angles([45], l2.reshape((1, 2)))[0]
 
 # Plot text
 th1 = ax.text(*l1, 'text not rotated correctly', fontsize=16,
               rotation=angle, rotation_mode='anchor')
 th2 = ax.text(*l2, 'text rotated correctly', fontsize=16,
-              rotation=trans_angle, rotation_mode='anchor')
+              rotation=angle, rotation_mode='anchor',
+              transform_rotates_text=True)
 
 plt.show()
diff --git a/lib/matplotlib/tests/test_text.py b/lib/matplotlib/tests/test_text.py
@@ -3,15 +3,14 @@
 import warnings
 
 import numpy as np
-import pytest
 from numpy.testing import assert_almost_equal
+import pytest
 
 import matplotlib as mpl
 from matplotlib.backend_bases import MouseEvent
 import matplotlib.patches as mpatches
 import matplotlib.pyplot as plt
 import matplotlib.transforms as mtransforms
-from matplotlib.backend_bases import MouseEvent
 from matplotlib.testing.decorators import check_figures_equal, image_comparison
 
 needs_usetex = pytest.mark.skipif(
