78 lines
3.7 KiB
Python
78 lines
3.7 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.util.unit
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def add_derived_unit(
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file: ifcopenshell.file, unit_type: str, userdefinedtype: str, attributes: dict[ifcopenshell.entity_instance, int]
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) -> ifcopenshell.entity_instance:
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"""Add a new Derive unit
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The supported types are ANGULARVELOCITYUNIT, AREADENSITYUNIT, COMPOUNDPLANEANGLEUNIT,
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DYNAMICVISCOSITYUNIT, HEATFLUXDENSITYUNIT, INTEGERCOUNTRATEUNIT, ISOTHERMALMOISTURECAPACITYUNIT,
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KINEMATICVISCOSITYUNIT, LINEARVELOCITYUNIT, MASSDENSITYUNIT, MASSFLOWRATEUNIT, MOISTUREDIFFUSIVITYUNIT,
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MOLECULARWEIGHTUNIT, SPECIFICHEATCAPACITYUNIT, THERMALADMITTANCEUNIT, THERMALCONDUCTANCEUNIT,
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THERMALRESISTANCEUNIT, THERMALTRANSMITTANCEUNIT, VAPORPERMEABILITYUNIT, VOLUMETRICFLOWRATEUNIT,
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ROTATIONALFREQUENCYUNIT, TORQUEUNIT, MOMENTOFINERTIAUNIT, LINEARMOMENTUNIT, LINEARFORCEUNIT,
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PLANARFORCEUNIT, MODULUSOFELASTICITYUNIT, SHEARMODULUSUNIT, LINEARSTIFFNESSUNIT, ROTATIONALSTIFFNESSUNIT,
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MODULUSOFSUBGRADEREACTIONUNIT, ACCELERATIONUNIT, CURVATUREUNIT, HEATINGVALUEUNIT, IONCONCENTRATIONUNIT,
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LUMINOUSINTENSITYDISTRIBUTIONUNIT, MASSPERLENGTHUNIT, MODULUSOFLINEARSUBGRADEREACTIONUNIT,
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MODULUSOFROTATIONALSUBGRADEREACTIONUNIT, PHUNIT, ROTATIONALMASSUNIT, SECTIONAREAINTEGRALUNIT,
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SECTIONMODULUSUNIT, SOUNDPOWERLEVELUNIT, SOUNDPOWERUNIT, SOUNDPRESSURELEVELUNIT, SOUNDPRESSUREUNIT,
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TEMPERATUREGRADIENTUNIT, TEMPERATURERATEOFCHANGEUNIT, THERMALEXPANSIONCOEFFICIENTUNIT, WARPINGCONSTANTUNIT,
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WARPINGMOMENTUNIT, USERDEFINED.
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In case of choosing USERDEFINED, the UserDefinedType parameter needs to be provided
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:param unit_type: A type of unit chosen from the list above. For
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example, choosing THERMALCONDUCTANCEUNIT will give you a Thermal conductance.
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:param userdefinedtype: The user defined type in case of choosing USERDEFINED, or None for no
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user defined type.
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:param attributes: a dictionary of attribute names and values.
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:return: The newly created IfcDerivedUnit
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Example:
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.. code:: python
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# Linear velocity in m/s
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length = ifcopenshell.api.unit.add_si_unit(model, unit_type="LENGTHUNIT")
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#2=IfcSIUnit(*,.LENGTHUNIT.,$,.METRE.)
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time = ifcopenshell.api.unit.add_si_unit(model, unit_type="TIMEUNIT")
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#4=IfcSIUnit(*,.TIMEUNIT.,$,.SECOND.)
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linear_velocity = ifcopenshell.api.unit.add_derived_unit(model, 'LINEARVELOCITY', None, {length : 1, time : -1})
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#10=IfcDerivedUnitElement(#2, 1)
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#11=IfcDerivedUnitElement(#4, -1)
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#12=IfcDerivedUnit((#10,#11),.LINEARVELOCITY.,$)
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"""
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derive_unit_elements = []
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for named_unit in attributes:
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derive_unit_elements.append(
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file.create_entity("IfcDerivedUnitElement", Unit=named_unit, Exponent=attributes[named_unit])
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)
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return file.create_entity(
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"IfcDerivedUnit", Elements=derive_unit_elements, UnitType=unit_type, UserDefinedType=userdefinedtype
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)
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