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Implement free float calculation. Thanks SigmaDimensions!

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This commit is contained in:
Dion Moult
2021-06-08 11:36:07 +10:00
parent 7d841c3f27
commit b9472c9bae
1 changed files with 38 additions and 2 deletions
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src/ifcopenshell-python/ifcopenshell/api/sequence/recalculate_schedule.py
+38 -2
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@@ -114,6 +114,7 @@ class Usecase:
self.file,
task_time=self.file.by_id(ifc_definition_id).TaskTime,
attributes={
"FreeFloat": ifcopenshell.util.date.datetime2ifc(data["free_float"], "IfcDuration"),
"TotalFloat": ifcopenshell.util.date.datetime2ifc(data["total_float"], "IfcDuration"),
"IsCritical": data["total_float"].days == 0,
"EarlyStart": ifcopenshell.util.date.datetime2ifc(data["early_start"], "IfcDateTime"),
@@ -190,6 +191,7 @@ class Usecase:
successors = list(self.g.successors(node))
predecessors = self.g.predecessors(node)
data = self.g.nodes[node]
free_floats = []
if node == "finish":
data["late_finish"] = data["early_finish"]
@@ -205,24 +207,44 @@ class Usecase:
return
finishes.append(self.offset_date(start, -edge["lag_time"], data))
finishes.append(self.offset_date(start, -edge["lag_time"], successor_data))
free_floats.append(
self.calculate_free_float(
data["early_finish"], successor_data["early_start"], edge["lag_time"], data, successor_data
)
)
elif edge["type"] == "SS":
start = successor_data.get("late_start")
if start is None:
return
starts.append(self.offset_date(start, -edge["lag_time"], data))
starts.append(self.offset_date(start, -edge["lag_time"], successor_data))
free_floats.append(
self.calculate_free_float(
data["early_start"], successor_data["early_start"], edge["lag_time"], data, successor_data
)
)
elif edge["type"] == "FF":
finish = successor_data.get("late_finish")
if finish is None:
return
finishes.append(self.offset_date(finish, -edge["lag_time"], data))
finishes.append(self.offset_date(finish, -edge["lag_time"], successor_data))
free_floats.append(
self.calculate_free_float(
data["early_finish"], successor_data["early_finish"], edge["lag_time"], data, successor_data
)
)
elif edge["type"] == "SF":
finish = successor_data.get("late_finish")
if finish is None:
return
starts.append(self.offset_date(finish, -edge["lag_time"], data))
starts.append(self.offset_date(finish, -edge["lag_time"], successor_data))
free_floats.append(
self.calculate_free_float(
data["early_start"], successor_data["early_finish"], edge["lag_time"], data, successor_data
)
)
if starts and finishes:
data["late_start"] = min(starts)
data["late_finish"] = min(finishes)
@@ -251,7 +273,21 @@ class Usecase:
else:
data["total_float"] = data["late_finish"] - data["early_finish"]
# Waiting for yassine to confirm relationships
# data["free_float"] = min([self.g.nodes[s]["early_start"] for s in successors])
data["free_float"] = min(free_floats) if free_floats else None
return True
def calculate_free_float(self, predecessor_date, successor_date, lag_time, predecessor_data, successor_data):
min_successor_date = min(
(
self.offset_date(successor_date, -lag_time, predecessor_data),
self.offset_date(successor_date, -lag_time, successor_data),
)
)
if predecessor_data["duration_type"] == "WORKTIME":
return datetime.timedelta(
days=ifcopenshell.util.sequence.count_working_days(
predecessor_date, min_successor_date, predecessor_data["calendar"]
)
)
return min_successor_date - predecessor_date