Alignment API updates to support new patch recipes

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

@@ -0,0 +1,63 @@
+# 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.util.placement
+from ifcopenshell import entity_instance
+import numpy as np
+
+
+def update_fallback_position(file: ifcopenshell.file, lp: entity_instance):
+    """
+    Updates the IfcLinearPlacement.CartesianPoint fallback position.
+
+    If the CartesianPosition is not assigned to the IfcLinearPlacement, one will be created
+
+    :param lp: The linear placement
+    :return: None
+    """
+
+    if not lp.CartesianPosition:
+        lp.CartesianPosition = file.createIfcAxis2Placement3D(
+            Location = file.createIfcCartesianPoint((0.,0.))
+        )
+
+    p = np.array(ifcopenshell.util.placement.get_axis2placement(lp.RelativePlacement))
+
+    x = float(p[0, 3])
+    y = float(p[1, 3])
+    z = float(p[2, 3])
+
+    rx = float(p[0, 0])
+    ry = float(p[1, 0])
+    rz = float(p[2, 0])
+
+    ax = float(p[0, 2])
+    ay = float(p[1, 2])
+    az = float(p[2, 2])
+
+    lp.CartesianPosition.Location.Coordinates = ((x,y,z))
+
+    if not lp.CartesianPosition.RefDirection:
+        lp.CartesianPosition.RefDirection = file.createIfcDirection((1.,0.,0.))
+
+    if not lp.CartesianPosition.Axis:
+        lp.CartesianPosition.Axis = file.createIfcDirection((0.,0.,1.))
+
+    lp.CartesianPosition.RefDirection.DirectionRatios = ((rx,ry,rz))
+    lp.CartesianPosition.Axis.DirectionRatios = ((ax,ay,az))