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/>.
+
+from typing import Any
+
+import ifcopenshell.api.sequence
+import ifcopenshell.util.date
+
+
+def edit_lag_time(file: ifcopenshell.file, lag_time: ifcopenshell.entity_instance, attributes: dict[str, Any]) -> None:
+    """Edits the attributes of an IfcLagTime
+
+    For more information about the attributes and data types of an
+    IfcLagTime, consult the IFC documentation.
+
+    :param lag_time: The IfcLagTime entity you want to edit
+    :param attributes: a dictionary of attribute names and values.
+    :return: None
+
+    Example:
+
+    .. code:: python
+
+        # Let's imagine we are creating a construction schedule. All tasks
+        # need to be part of a work schedule.
+        schedule = ifcopenshell.api.sequence.add_work_schedule(model, name="Construction Schedule A")
+
+        # Let's imagine a root construction task
+        construction = ifcopenshell.api.sequence.add_task(model,
+            work_schedule=schedule, name="Construction", identification="C")
+
+        # Let's imagine we're doing a typically formwork, reinforcement,
+        # pour sequence. Let's start with the formwork. It'll take us 2
+        # days.
+        formwork = ifcopenshell.api.sequence.add_task(model,
+            parent_task=construction, name="Formwork", identification="C.1")
+        time = ifcopenshell.api.sequence.add_task_time(model, task=formwork)
+        ifcopenshell.api.sequence.edit_task_time(model,
+            task_time=time, attributes={"ScheduleStart": "2000-01-01", "ScheduleDuration": "P2D"})
+
+        # Now let's do the reinforcement. It'll take us another 2 days.
+        reinforcement = ifcopenshell.api.sequence.add_task(model,
+            parent_task=construction, name="Reinforcement", identification="C.2")
+        time = ifcopenshell.api.sequence.add_task_time(model, task=reinforcement)
+        ifcopenshell.api.sequence.edit_task_time(model,
+            task_time=time, attributes={"ScheduleStart": "2000-01-01", "ScheduleDuration": "P2D"})
+
+        # Now let's say the formwork must finish before the reinforcement
+        # can start. This is a typical finish to start relationship (FS).
+        sequence = ifcopenshell.api.sequence.assign_sequence(model,
+            relating_process=formwork, related_process=reinforcement)
+
+        # Now typically there would be no lag time between formwork and
+        # reinforcement, but let's pretend that we had to allow 1 day gap
+        # for whatever reason.
+        lag = ifcopenshell.api.sequence.assign_lag_time(model, rel_sequence=sequence, lag_value="P1D")
+
+        # Or, let's make it 2 days instead.
+        ifcopenshell.api.sequence.edit_lag_time(model, lag_time=lag, attributes={"LagValue": "P2D"})
+    """
+    for name, value in attributes.items():
+        if name == "LagValue" and value is not None:
+            if isinstance(value, float):
+                value = file.createIfcRatioMeasure(value)
+            else:
+                value = file.createIfcDuration(ifcopenshell.util.date.datetime2ifc(value, "IfcDuration"))
+        setattr(lag_time, name, value)
+    for rel in [r for r in file.get_inverse(lag_time) if r.is_a("IfcRelSequence")]:
+        ifcopenshell.api.sequence.cascade_schedule(file, task=rel.RelatedProcess)