Minor fix

src/ifcopenshell-python/ifcopenshell/api/geometry/add_axis_representation.py

@@ -0,0 +1,49 @@
+# IfcOpenShell - IFC toolkit and geometry engine
+# Copyright (C) 2022 Dion Moult <dion@thinkmoult.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.unit
+
+
+class Usecase:
+    def __init__(self, file, **settings):
+        self.file = file
+        self.settings = {
+            "context": None,  # IfcGeometricRepresentationContext
+            "axis": [],  # A list of ordered coordinates for the axis
+        }
+        for key, value in settings.items():
+            self.settings[key] = value
+
+    def execute(self):
+        self.settings["unit_scale"] = ifcopenshell.util.unit.calculate_unit_scale(self.file)
+        points = [self.convert_si_to_unit(p) for p in self.settings["axis"]]
+        if self.file.schema == "IFC2X3":
+            curve = self.file.createIfcPolyline([self.file.createIfcCartesianPoint(p) for p in points])
+        else:
+            curve = self.file.createIfcIndexedPolyCurve(self.file.createIfcCartesianPointList3D(points))
+        return self.file.createIfcShapeRepresentation(
+            self.settings["context"],
+            self.settings["context"].ContextIdentifier,
+            "Curve2D" if len(self.settings["axis"][0]) == 2 else "Curve3D",
+            [curve],
+        )
+
+    def convert_si_to_unit(self, co):
+        if isinstance(co, (tuple, list)):
+            return [self.convert_si_to_unit(o) for o in co]
+        return co / self.settings["unit_scale"]