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/>.
+
+import ifcopenshell
+
+
+def unassign_layer(
+    file: ifcopenshell.file, items: list[ifcopenshell.entity_instance], layer: ifcopenshell.entity_instance
+) -> None:
+    """Unassigns representation items or representations from a layer
+
+    If the element isn't assigned to the layer, nothing will happen.
+    If after unassignment layer won't have any assigned items it will be
+    removed to keep IFC valid.
+
+    :param items: A list IfcRepresentationItem / IfcRepresentation elements to unassign
+    :param layer: The IfcPresentationLayerAssignment to unassign from
+    :return: None
+
+    Example:
+
+    .. code:: python
+
+        # Remember, all geometry needs to specify the context it is part of first.
+        # See ifcopenshell.api.context.add_context for details.
+        model = ifcopenshell.api.context.add_context(model, context_type="Model")
+        body = ifcopenshell.api.context.add_context(model,
+            context_type="Model", context_identifier="Body", target_view="MODEL_VIEW", parent=model
+        )
+
+        wall = ifcopenshell.api.root.create_entity(model, ifc_class="IfcWall")
+        representation = ifcopenshell.api.geometry.add_wall_representation(model,
+            context=body, length=5, height=3, thickness=0.2)
+        ifcopenshell.api.geometry.assign_representation(model,
+            product=wall, representation=representation)
+        ifcopenshell.api.geometry.edit_object_placement(model, product=wall)
+
+        # Now let's create a layer that contains walls
+        layer = ifcopenshell.api.layer.add_layer(model, name="AI-WALL")
+
+        # And assign our wall representation item (in this example, there is
+        # only one item) to the layer.
+        ifcopenshell.api.layer.assign_layer(model, items=[representation.Items[0]], layer=layer)
+
+        # Let's undo it!
+        ifcopenshell.api.layer.unassign_layer(model, items=[representation.Items[0]], layer=layer)
+    """
+    assigned_items = set(layer.AssignedItems) or set()
+    items_set = set(items)
+    if not items_set.issubset(assigned_items):
+        return
+    assigned_items = list(assigned_items - items_set)
+
+    # keep IFC valid in case if there are no items left
+    if assigned_items:
+        layer.AssignedItems = assigned_items
+    else:
+        file.remove(layer)