First Commit

2026-05-31 10:17:09 +07:00
commit 17a9c69379
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+# IfcOpenShell - IFC toolkit and geometry engine
+# Copyright (C) 2021 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/>.
+from typing import Optional
+
+import ifcopenshell
+
+
+def unassign_unit(file: ifcopenshell.file, units: Optional[list[ifcopenshell.entity_instance]] = None) -> None:
+    """Unassigns units as default units for the project
+
+    :param units: A list of units to unassign as project defaults.
+    :return: None
+
+    Example:
+
+    .. code:: python
+
+        # You need a project before you can assign units.
+        ifcopenshell.api.root.create_entity(model, ifc_class="IfcProject")
+
+        # Millimeters and square meters
+        length = ifcopenshell.api.unit.add_si_unit(model, unit_type="LENGTHUNIT", prefix="MILLI")
+        area = ifcopenshell.api.unit.add_si_unit(model, unit_type="AREAUNIT")
+
+        # Make it our default units, if we are doing a metric building
+        ifcopenshell.api.unit.assign_unit(model, units=[length, area])
+
+        # Actually, we don't need areas.
+        ifcopenshell.api.unit.unassign_unit(model, units=[area])
+    """
+    unit_assignments = file.by_type("IfcUnitAssignment")
+    if not unit_assignments:
+        return
+    unit_assignment = unit_assignments[0]
+    units_set = set(unit_assignment.Units or [])
+    units_set = units_set - set(units or [])
+    if units_set:
+        unit_assignment.Units = list(units_set)
+        return
+    file.remove(unit_assignment)