Add visual test for ScatterRegionLayerArtist

glue/tests/visual/py311-test-visual.json

@@ -2,5 +2,6 @@
     "glue.viewers.histogram.tests.test_viewer.test_simple_viewer": "cb08123fbad135ab614bb7ec13475fcc83321057d884fe80c3a32970b2d14762",
     "glue.viewers.image.tests.test_viewer.test_simple_viewer": "72abd60b484d14f721254f027bb0ab9b36245d5db77eb87693f4dd9998fd28be",
     "glue.viewers.profile.tests.test_viewer.test_simple_viewer": "f68a21be5080fec513388b2d2b220512e7b0df5498e2489da54e58708de435b3",
-    "glue.viewers.scatter.tests.test_viewer.test_simple_viewer": "1020a7bd3abe40510b9e03047c3b423b75c3c64ac18e6dcd6257173cec1ed53f"
+    "glue.viewers.scatter.tests.test_viewer.test_simple_viewer": "1020a7bd3abe40510b9e03047c3b423b75c3c64ac18e6dcd6257173cec1ed53f",
+    "glue.viewers.image.tests.test_viewer.test_region_layer": "b54088d1f31562d309d35c5e90c0a382c7ba4c16cc0db8134e9532f71f047076"
   }

glue/viewers/image/tests/test_viewer.py

@@ -4,6 +4,10 @@
 from glue.viewers.image.viewer import SimpleImageViewer
 from glue.core.application_base import Application
 from glue.core.data import Data
+from glue.core.link_helpers import LinkSame
+from glue.core.data_region import RegionData
+
+from shapely.geometry import Polygon, MultiPolygon
 
 
 @visual_test
@@ -25,3 +29,35 @@
     app.data_collection.new_subset_group(label='subset1', subset_state=data1.pixel_component_ids[1] > 1.2)
 
     return viewer.figure
+
+
+@visual_test
+def test_region_layer():
+    poly_1 = Polygon([(20, 20), (60, 20), (60, 40), (20, 40)])
+    poly_2 = Polygon([(60, 50), (60, 70), (80, 70), (80, 50)])
+    poly_3 = Polygon([(10, 10), (15, 10), (15, 15), (10, 15)])
+    poly_4 = Polygon([(10, 20), (15, 20), (15, 30), (10, 30), (12, 25)])
+
+    polygons = MultiPolygon([poly_3, poly_4])
+
+    geoms = np.array([poly_1, poly_2, polygons])
+    values = np.array([1, 2, 3])
+    region_data = RegionData(regions=geoms, values=values)
+
+    image_data = Data(x=np.arange(10000).reshape((100, 100)), label='data1')
+    app = Application()
+    app.data_collection.append(image_data)
+    app.data_collection.append(region_data)
+
+    link1 = LinkSame(region_data.center_x_id, image_data.pixel_component_ids[0])
+    link2 = LinkSame(region_data.center_y_id, image_data.pixel_component_ids[1])
+    app.data_collection.add_link(link1)
+    app.data_collection.add_link(link2)
+
+    viewer = app.new_data_viewer(SimpleImageViewer)
+    viewer.add_data(image_data)
+    viewer.add_data(region_data)
+
+    app.data_collection.new_subset_group(label='subset1', subset_state=region_data.id['values'] > 2)
+
+    return viewer.figure