Fix vertical alignment of text (#13029)

stefraynaud · timhoffm · commit edeccc6afc8f · 2018-12-23T19:14:16.000+01:00
* Fix vertical alignment of text This solves #13028. * Add test to make sure rotation_mode does break text position ... when rotation=0
diff --git a/lib/matplotlib/tests/test_text.py b/lib/matplotlib/tests/test_text.py
@@ -349,6 +349,19 @@ def test_get_rotation_mod360():
         assert_almost_equal(text.get_rotation(i), j)
 
 
+@pytest.mark.parametrize("ha", ["center", "right", "left"])
+@pytest.mark.parametrize("va", ["center", "top", "bottom",
+                                "baseline", "center_baseline"])
+def test_null_rotation_with_rotation_mode(ha, va):
+    fig, ax = plt.subplots()
+    kw = dict(rotation=0, va=va, ha=ha)
+    t0 = ax.text(.5, .5, 'test', rotation_mode='anchor', **kw)
+    t1 = ax.text(.5, .5, 'test', rotation_mode='default', **kw)
+    fig.canvas.draw()
+    assert_almost_equal(t0.get_window_extent(fig.canvas.renderer).get_points(),
+                        t1.get_window_extent(fig.canvas.renderer).get_points())
+
+
 @image_comparison(baseline_images=['text_bboxclip'])
 def test_bbox_clipping():
     plt.text(0.9, 0.2, 'Is bbox clipped?', backgroundcolor='r', clip_on=True)
diff --git a/lib/matplotlib/text.py b/lib/matplotlib/text.py
@@ -403,7 +403,7 @@ def _get_layout(self, renderer):
             elif valign == 'baseline':
                 offsety = ymax1 - baseline
             elif valign == 'center_baseline':
-                offsety = (ymin1 + ymax1 - baseline) / 2.0
+                offsety = ymax1 - baseline / 2.0
             else:
                 offsety = ymin1
 
