TST: Update test_as_mpl_selector to accept rotated regions

CHANGES.rst

@@ -9,6 +9,9 @@ New Features
 
 - Added the DS9 'boxcircle' point symbol. [#387]
 
+- Support rotation of the ``as_mpl_selector`` widgets for rectangular
+  and ellipse regions. [#390]
+
 Bug Fixes
 ---------
 

regions/shapes/tests/test_ellipse.py

@@ -15,7 +15,7 @@
 from ...tests.helpers import make_simple_wcs
 from ..ellipse import EllipsePixelRegion, EllipseSkyRegion
 from .test_common import BaseTestPixelRegion, BaseTestSkyRegion
-from .utils import HAS_MATPLOTLIB  # noqa
+from .utils import HAS_MATPLOTLIB, MATPLOTLIB_HAS_ROTATING_SELECTORS  # noqa
 
 
 @pytest.fixture(scope='session', name='wcs')
@@ -115,12 +115,16 @@ def update_mask(reg):
         # works with rotated ellipses, the following exception check can
         # be removed as well as the ``angle=0 * u.deg`` in the call to
         # copy() below.
-        with pytest.raises(NotImplementedError,
-                           match=('Cannot create matplotlib selector for '
-                                  'rotated ellipse.')):
-            self.reg.as_mpl_selector(ax)
+        if not MATPLOTLIB_HAS_ROTATING_SELECTORS:
+            with pytest.raises(NotImplementedError,
+                               match=('Cannot create matplotlib selector for rotated ellipse.')):
+                self.reg.as_mpl_selector(ax)
 
-        region = self.reg.copy(angle=0 * u.deg)
+            angle = 0 * u.deg
+        else:
+            angle = self.reg.angle
+
+        region = self.reg.copy(angle=angle)
 
         selector = region.as_mpl_selector(ax, callback=update_mask, sync=sync)  # noqa
 
@@ -162,7 +166,7 @@ def update_mask(reg):
             assert_allclose(region.center.y, 4)
             assert_allclose(region.width, 4)
             assert_allclose(region.height, 3)
-            assert_quantity_allclose(region.angle, 0 * u.deg)
+            assert_quantity_allclose(region.angle, angle)
 
             assert_equal(mask, 0)
 

regions/shapes/tests/test_rectangle.py

@@ -15,7 +15,7 @@
 from ...tests.helpers import make_simple_wcs
 from ..rectangle import RectanglePixelRegion, RectangleSkyRegion
 from .test_common import BaseTestPixelRegion, BaseTestSkyRegion
-from .utils import HAS_MATPLOTLIB  # noqa
+from .utils import HAS_MATPLOTLIB, MATPLOTLIB_HAS_ROTATING_SELECTORS  # noqa
 
 
 @pytest.fixture(scope='session', name='wcs')
@@ -118,12 +118,16 @@ def update_mask(reg):
         # this works with rotated rectangles, the following exception
         # check can be removed as well as the ``angle=0 * u.deg`` in the
         # call to copy() below.
-        with pytest.raises(NotImplementedError,
-                           match=('Cannot create matplotlib selector for '
-                                  'rotated rectangle.')):
-            self.reg.as_mpl_selector(ax)
+        if not MATPLOTLIB_HAS_ROTATING_SELECTORS:
+            with pytest.raises(NotImplementedError,
+                               match=('Cannot create matplotlib selector for rotated rectangle.')):
+                self.reg.as_mpl_selector(ax)
 
-        region = self.reg.copy(angle=0 * u.deg)
+            angle = 0 * u.deg
+        else:
+            angle = self.reg.angle
+
+        region = self.reg.copy(angle=angle)
 
         selector = region.as_mpl_selector(ax, callback=update_mask, sync=sync)  # noqa
 
@@ -162,7 +166,7 @@ def update_mask(reg):
             assert_allclose(region.center.y, 4)
             assert_allclose(region.width, 4)
             assert_allclose(region.height, 3)
-            assert_quantity_allclose(region.angle, 0 * u.deg)
+            assert_quantity_allclose(region.angle, angle)
 
             assert_equal(mask, 0)
 

regions/shapes/tests/utils.py

@@ -1,7 +1,11 @@
 # Licensed under a 3-clause BSD style license - see LICENSE.rst
 
+MATPLOTLIB_HAS_ROTATING_SELECTORS = False
 try:
     import matplotlib  # noqa
     HAS_MATPLOTLIB = True
+    import matplotlib.widgets
+    if hasattr(matplotlib.widgets.EllipseSelector, '_rotation'):
+        MATPLOTLIB_HAS_ROTATING_SELECTORS = True
 except ImportError:
     HAS_MATPLOTLIB = False