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Dion Moult
59 lines
2.2 KiB
Python
59 lines
2.2 KiB
Python
# IfcOpenShell - IFC toolkit and geometry engine
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# Copyright (C) 2021 Dion Moult <dion@thinkmoult.com>
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#
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# This file is part of IfcOpenShell.
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#
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# IfcOpenShell is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Lesser General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# IfcOpenShell is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public License
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# along with IfcOpenShell. If not, see <http://www.gnu.org/licenses/>.
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import ifcopenshell
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from typing import Optional
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def unassign_unit(file: ifcopenshell.file, units: Optional[list[ifcopenshell.entity_instance]] = None) -> None:
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"""Unassigns units as default units for the project
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:param units: A list of units to assign as project defaults.
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:type units: list[ifcopenshell.entity_instance],optional
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:return: None
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:rtype: None
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Example:
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.. code:: python
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# You need a project before you can assign units.
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ifcopenshell.api.root.create_entity(model, ifc_class="IfcProject")
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# Millimeters and square meters
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length = ifcopenshell.api.unit.add_si_unit(model, unit_type="LENGTHUNIT", prefix="MILLI")
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area = ifcopenshell.api.unit.add_si_unit(model, unit_type="AREAUNIT")
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# Make it our default units, if we are doing a metric building
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ifcopenshell.api.unit.assign_unit(model, units=[length, area])
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# Actually, we don't need areas.
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ifcopenshell.api.unit.unassign_unit(model, units=[area])
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"""
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settings = {"units": units}
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unit_assignment = file.by_type("IfcUnitAssignment")
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if not unit_assignment:
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return
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unit_assignment = unit_assignment[0]
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units = set(unit_assignment.Units or [])
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units = units - set(settings["units"])
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if units:
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unit_assignment.Units = list(units)
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return unit_assignment
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file.remove(unit_assignment)
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