78 lines
3.5 KiB
Python
78 lines
3.5 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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from typing import Any
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import ifcopenshell
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def edit_layer_usage(file: ifcopenshell.file, usage: ifcopenshell.entity_instance, attributes: dict[str, Any]) -> None:
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"""Edits the attributes of an IfcMaterialLayerSetUsage
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This is typically used to change the offset from the reference line to
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the layers.
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For more information about the attributes and data types of an
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IfcMaterialLayerSetUsage, consult the IFC documentation.
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:param usage: The IfcMaterialLayerSetUsage entity you want to edit
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:param attributes: a dictionary of attribute names and values.
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:return: None
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Example:
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.. code:: python
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# Let's start with a simple concrete material
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concrete = ifcopenshell.api.material.add_material(model, name="CON01", category="concrete")
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# If we have a concrete wall, we should use a layer set. Again,
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# let's start with a wall type, not occurrences.
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wall_type = ifcopenshell.api.root.create_entity(model, ifc_class="IfcWallType", name="WAL01")
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# Even though there is only one layer in our layer set, we still use
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# a layer set because it makes it clear that this is a layered
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# construction. Let's say it's a 200mm thick concrete layer.
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material_set = ifcopenshell.api.material.add_material_set(model,
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name="CON200", set_type="IfcMaterialLayerSet")
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layer = ifcopenshell.api.material.add_layer(model, layer_set=material_set, material=steel)
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ifcopenshell.api.material.edit_layer(model, layer=layer, attributes={"LayerThickness": 200})
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# Our wall type now has the layer set assigned to it
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ifcopenshell.api.material.assign_material(model,
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products=[wall_type], type="IfcMaterialLayerSet", material=material_set)
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# Let's imagine an occurrence of this wall type.
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wall = ifcopenshell.api.root.create_entity(model, ifc_class="IfcWall")
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ifcopenshell.api.type.assign_type(model, related_objects=[wall], relating_type=wall_type)
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# Our wall occurrence needs to have a "set usage" which describes
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# how the layers relate to a reference line (typically a 2D line
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# representing the extents of the wall). Usages are special since
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# they automatically detect the inherited material set from the
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# type. You'd write similar code for a profile set.
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rel = ifcopenshell.api.material.assign_material(model,
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products=[wall], type="IfcMaterialLayerSetUsage")
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# Let's change the offset from the reference line to be 200mm
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# instead of the default of 0mm.
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ifcopenshell.api.material.edit_layer_usage(model,
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usage=rel.RelatingMaterial, attributes={"OffsetFromReferenceLine": 200})
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"""
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for name, value in attributes.items():
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setattr(usage, name, value)
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