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
+import ifcopenshell.api.owner
+import ifcopenshell.util.element
+
+
+def unassign_flow_control(
+    file: ifcopenshell.file,
+    relating_flow_element: ifcopenshell.entity_instance,
+    related_flow_control: ifcopenshell.entity_instance,
+) -> None:
+    """Unassigns flow control element from the flow element.
+
+    :param related_flow_control: IfcDistributionControlElement controling the
+        flow element
+    :param relating_flow_element: The IfcDistributionFlowElement that is being controlled
+    :return: None
+
+    Example:
+
+    .. code:: python
+
+        # assign control to the flow element
+        flow_element = file.createIfcFlowSegment()
+        flow_control = file.createIfcController()
+        relation = ifcopenshell.api.system.assign_flow_control(
+            file, relating_control=flow_control, related_object=flow_element
+        )
+
+        # und unassign it
+        ifcopenshell.api.system.unassign_flow_control(file,
+            relating_control=flow_control, related_object=flow_element
+        )
+    """
+
+    if not related_flow_control.AssignedToFlowElement:
+        return
+    assignment = related_flow_control.AssignedToFlowElement[0]
+    if assignment.RelatingFlowElement != relating_flow_element:
+        return
+    if len(assignment.RelatedControlElements) == 1:
+        history = assignment.OwnerHistory
+        file.remove(assignment)
+        if history:
+            ifcopenshell.util.element.remove_deep2(file, history)
+        return
+    related_flow_controls = list(assignment.RelatedControlElements)
+    related_flow_controls.remove(related_flow_control)
+    assignment.RelatedControlElements = related_flow_controls
+    ifcopenshell.api.owner.update_owner_history(file, element=assignment)