style.remove_style to handle IfcFillAreaStyles

src/ifcopenshell-python/ifcopenshell/api/style/remove_style.py

@@ -51,9 +51,13 @@ class Usecase:
 
     def execute(self, style: ifcopenshell.entity_instance) -> None:
         self.purge_inverses(style)
-        if style.is_a("IfcSurfaceStyle"):
+        ifc_class = style.is_a()
+        if ifc_class == "IfcSurfaceStyle":
             for style_ in style.Styles:
                 ifcopenshell.api.style.remove_surface_style(self.file, style=style_)
+        elif ifc_class == "IfcFillAreaStyle":
+            for style_ in style.FillStyles:
+                ifcopenshell.util.element.remove_deep2(self.file, style_, also_consider=[style])
         self.file.remove(style)
 
     def purge_inverses(self, style: ifcopenshell.entity_instance) -> None:

src/ifcopenshell-python/test/api/style/test_remove_style.py

@@ -69,6 +69,28 @@ class TestRemoveStyle(test.bootstrap.IFC4):
         assert len(self.file.by_type("IfcMaterialDefinitionRepresentation")) == 0
         assert len(self.file.by_type("IfcStyledRepresentation")) == 0
 
+    def test_remove_fill_area_with_fill_area_style_hatching(self):
+        element = self.file.create_entity("IfcWall")
+        material = ifcopenshell.api.material.add_material(self.file)
+        ifcopenshell.api.material.assign_material(self.file, products=[element], material=material)
+        curve_style = self.file.create_entity("IfcCurveStyle")
+        fill_style = self.file.create_entity("IfcFillAreaStyleHatching", HatchLineAppearance=curve_style)
+        style = self.file.create_entity("IfcFillAreaStyle", FillStyles=[fill_style])
+        self.file.create_entity(
+            "IfcMaterialDefinitionRepresentation",
+            RepresentedMaterial=material,
+            Representations=[
+                self.file.create_entity(
+                    "IfcStyledRepresentation",
+                    Items=[self.file.create_entity("IfcStyledItem", Styles=[style])],
+                )
+            ],
+        )
+        ifcopenshell.api.style.remove_style(self.file, style)
+        assert len(self.file.by_type("IfcPresentationStyle")) == 0
+        assert len(self.file.by_type("IfcMaterialDefinitionRepresentation")) == 0
+        assert len(self.file.by_type("IfcStyledRepresentation")) == 0
+
 
 class TestRemoveStyleIFC2X3(test.bootstrap.IFC2X3, TestRemoveStyle):
     pass