Adds alignment API function to get the alignment layout from one of its segments

src/ifcopenshell-python/ifcopenshell/api/alignment/__init__.py

@@ -63,6 +63,7 @@ from .create_segment_representations import create_segment_representations
 from .distance_along_from_station import distance_along_from_station
 from .get_alignment import get_alignment
 from .get_alignment_layout_nest import get_alignment_layout_nest
+from .get_alignment_layout import get_alignment_layout
 from .get_alignment_layouts import get_alignment_layouts
 from .get_alignment_segment_nest import get_alignment_segment_nest
 from .get_alignment_start_station import get_alignment_start_station
@@ -107,6 +108,7 @@ __all__ = [
     "distance_along_from_station",
     "get_alignment",
     "get_alignment_layout_nest",
+    "get_alignment_layout",
     "get_alignment_layouts",
     "get_alignment_segment_nest",
     "get_alignment_start_station",

src/ifcopenshell-python/ifcopenshell/api/alignment/get_alignment_layout.py

@@ -0,0 +1,41 @@
+# IfcOpenShell - IFC toolkit and geometry engine
+# Copyright (C) 2025 Thomas Krijnen <thomas@aecgeeks.com>
+#
+# This file is part of IfcOpenShell.
+#
+# IfcOpenShell is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Lesser General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# IfcOpenShell is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public License
+# along with IfcOpenShell.  If not, see <http://www.gnu.org/licenses/>.
+
+from collections.abc import Sequence
+
+from ifcopenshell import entity_instance
+
+
+def get_alignment_layout(segment: entity_instance) -> entity_instance:
+    """
+    Returns the layout alignment that the segment is nested into
+    """
+    expected_types = ["IfcAlignmentSegment"]
+    if not segment.is_a() in expected_types:
+        raise TypeError(
+            f"Expected entity type to be one of {[_ for _ in expected_types]}, instead received '{segment.is_a()}"
+        )
+
+    layout = None
+    layouts=["IfcAlignmentHorizontal","IfcAlignmentVertical","IfcAlignmentCant"]
+    for nest in segment.Nests:
+        if nest.RelatingObject.is_a() in layouts:
+            layout = nest.RelatingObject
+            break
+
+    return layout

src/ifcopenshell-python/test/api/alignment/test_get_alignment_layout.py

@@ -0,0 +1,49 @@
+# IfcOpenShell - IFC toolkit and geometry engine
+# Copyright (C) 2025 Thomas Krijnen <thomas@aecgeeks.com>
+#
+# This file is part of IfcOpenShell.
+#
+# IfcOpenShell is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Lesser General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# IfcOpenShell is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public License
+# along with IfcOpenShell.  If not, see <http://www.gnu.org/licenses/>.
+
+
+import ifcopenshell.api.alignment
+import ifcopenshell.api.context
+import ifcopenshell.api.unit
+
+
+def test_get_alignment_layout():
+    file = ifcopenshell.file(schema="IFC4X3_ADD2")
+    project = file.createIfcProject(GlobalId=ifcopenshell.guid.new(), Name="Test")
+    length = ifcopenshell.api.unit.add_si_unit(file, unit_type="LENGTHUNIT")
+    ifcopenshell.api.unit.assign_unit(file, units=[length])
+    geometric_representation_context = ifcopenshell.api.context.add_context(file, context_type="Model")
+    axis_model_representation_subcontext = ifcopenshell.api.context.add_context(
+        file,
+        context_type="Model",
+        context_identifier="Axis",
+        target_view="MODEL_VIEW",
+        parent=geometric_representation_context,
+    )
+
+    alignment = ifcopenshell.api.alignment.create(file,"Test",include_vertical=True,include_cant=True)
+    horiz = ifcopenshell.api.alignment.get_horizontal_layout(alignment)
+    vert = ifcopenshell.api.alignment.get_vertical_layout(alignment)
+    cant = ifcopenshell.api.alignment.get_cant_layout(alignment)
+
+    assert horiz == ifcopenshell.api.alignment.get_alignment_layout(horiz.IsNestedBy[0].RelatedObjects[0])
+    assert vert == ifcopenshell.api.alignment.get_alignment_layout(vert.IsNestedBy[0].RelatedObjects[0])
+    assert cant == ifcopenshell.api.alignment.get_alignment_layout(cant.IsNestedBy[0].RelatedObjects[0])
+
+
+test_get_alignment_layout()