72 lines
3.2 KiB
Python
72 lines
3.2 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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def assign_layer(
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file: ifcopenshell.file, items: list[ifcopenshell.entity_instance], layer: ifcopenshell.entity_instance
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) -> None:
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"""Assigns representation items or representations to a layer
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In IFC, instead of objects being assigned to layers, representation
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items are assigned to layers. Representation items are portions of the
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object's representation. For example, this allows a single IFC Window
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element to have portions of its 2D linework (e.g. the cross section of
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its frame) assigned to one layer, and another portion (e.g. the glazing
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panels) assigned to another layer.
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:param items: The list of IfcRepresentationItems / IfcRepresentations to assign to the layer. This
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should be the items from the object's IfcShapeRepresentation.
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:param layer: The IfcPresentationLayerAssignment layer to assign the
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item to.
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:return: None
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Example:
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.. code:: python
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# Remember, all geometry needs to specify the context it is part of first.
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# See ifcopenshell.api.context.add_context for details.
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model = ifcopenshell.api.context.add_context(model, context_type="Model")
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body = ifcopenshell.api.context.add_context(model,
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context_type="Model", context_identifier="Body", target_view="MODEL_VIEW", parent=model
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)
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wall = ifcopenshell.api.root.create_entity(model, ifc_class="IfcWall")
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representation = ifcopenshell.api.geometry.add_wall_representation(model,
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context=body, length=5, height=3, thickness=0.2)
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ifcopenshell.api.geometry.assign_representation(model,
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product=wall, representation=representation)
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ifcopenshell.api.geometry.edit_object_placement(model, product=wall)
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# Now let's create a layer that contains walls
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layer = ifcopenshell.api.layer.add_layer(model, name="AI-WALL")
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# And assign our wall representation item (in this example, there is
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# only one item) to the layer.
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ifcopenshell.api.layer.assign_layer(model, items=[representation.Items[0]], layer=layer)
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"""
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# support AssignedItems == None since layer might just got created
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assigned_items: set[ifcopenshell.entity_instance]
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assigned_items = set(layer.AssignedItems or [])
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items_set = set(items)
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if items_set.issubset(assigned_items):
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return
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layer.AssignedItems = list(assigned_items | items_set)
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