Adds IfcPolyline representation for alignment. Also some general cleanup

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

@@ -0,0 +1,57 @@
+# 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
+import ifcopenshell.api.alignment
+import ifcopenshell.api.geometry
+from ifcopenshell import entity_instance
+
+import math
+from collections.abc import Sequence
+
+
+def _create_polyline_representation(file: ifcopenshell.file, alignment: entity_instance, points: Sequence[Sequence[float]]) -> None:
+    """
+    Create geometric representation for the alignment based on an IfcPolyline
+
+    :param alignment: The alignment for which the representation is being created
+    :return: None
+    """
+    expected_type = "IfcAlignment"
+    if not alignment.is_a(expected_type):
+        raise TypeError(f"Expected {expected_type} but got {alignment.is_a()}")
+
+    axis_geom_subcontext = ifcopenshell.api.alignment.get_axis_subcontext(file)
+
+    placement = file.createIfcLocalPlacement(
+        PlacementRelTo=None,
+        RelativePlacement=file.createIfcAxis2Placement3D(Location=file.createIfcCartesianPoint(Coordinates=(0.0, 0.0, 0.0))),
+    )
+        
+    curve = file.createIfcPolyLine(Points=points)
+
+    representation = file.createIfcShapeRepresentation(
+        ContextOfItems=axis_geom_subcontext,
+        RepresentationIdentifier="Axis",
+        RepresentationType="Curve3D",
+        Items=(curve,),
+    )
+
+
+    alignment.ObjectPlacement = placement
+    ifcopenshell.api.geometry.assign_representation(file, alignment, representation)