First Commit

2026-05-31 10:17:09 +07:00
commit 17a9c69379
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+# 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.util.representation
+from ifcopenshell import entity_instance
+
+
+def get_basis_curve(alignment: entity_instance) -> entity_instance:
+    """
+    Returns the basis curve for an alignment. This curve is the geometric representation that is used
+    as the basis curve for vertical and cant alignments.
+
+    :param alignment: The alignment
+    :return: The geometric representation that is used as a basis curve, typically an IfcCompositeCurve, or None if the alignment does not have a representation
+
+    Example:
+
+    .. code:: python
+        alignment = model.by_type("IfcAlignment")[0]
+        composite_curve = ifcopenshell.api.alignment.get_basis_curve(alignment)
+    """
+    axis = None
+
+    representations = ifcopenshell.util.representation.get_representations_iter(alignment)
+    for representation in representations:
+        if (
+            (representation.RepresentationIdentifier == "Axis" and representation.RepresentationType == "Curve2D")
+            or (
+                representation.RepresentationIdentifier == "FootPrint"
+                and representation.RepresentationType == "Curve2D"
+            )
+            or (representation.RepresentationIdentifier == "Axis" and representation.RepresentationType == "Curve3D")
+        ):  # in the case of IfcPolyline or IfcIndexedPolyCurve with 3D points
+            axis = representation
+            return None if axis.Items == None or len(axis.Items) == 0 else axis.Items[0]
+
+    if axis == None and 0 < len(alignment.Decomposes):
+        parent_alignment = alignment.Decomposes[0].RelatingObject
+        return get_basis_curve(parent_alignment)
+
+    return None