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Dion Moult
130 lines
6.1 KiB
Python
130 lines
6.1 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.api
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class Usecase:
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def __init__(self, file, cost_item=None, products=None, prop_name=""):
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"""Adds a cost item quantity that is parametrically connected to a product
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A cost item may have its subtotal calculated by multiplying a unit value
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by a quantity associated with the cost item. That quantity may be either
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manually specified or parametrically connected to a quantity on a
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product. This API function lets you create that parametric connection.
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For example, you may wish to have a cost item linked to the "NetVolume"
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quantity on all IfcSlabs. Each quantity has a name which you can
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specify. If the quantity is updated in-place (which should occur for
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Native IFC applications) then the quantity for the cost item will
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automatically update as well. If the quantity is deleted and then
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re-added, then the parametric relationship is also lost.
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This API also automatically assigns a control relationship between the
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cost item and the product, so it is not necessary to use
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ifcopenshell.api.control.assign_control.
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:param cost_item: The IfcCostItem to assign parametric quantities to
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:type cost_item: ifcopenshell.entity_instance.entity_instance
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:param products: The IfcObjects to assign parametric quantities to
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:type products: list[ifcopenshell.entity_instance.entity_instance]
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:param prop_name: The name of the quantity. If this is not specified,
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then it is assumed that there is no calculated quantity, and the
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number of objects are counted instead.
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:type prop_name: str, optional
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:return: None
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:rtype: None
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Example:
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.. code:: python
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schedule = ifcopenshell.api.run("cost.add_cost_schedule", model)
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item = ifcopenshell.api.run("cost.add_cost_item", model, cost_schedule=schedule)
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# Let's imagine a unit cost of 5.0 per unit volume
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value = ifcopenshell.api.run("cost.add_cost_value", model, parent=item)
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ifcopenshell.api.run("cost.edit_cost_value", model, cost_value=value,
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attributes={"AppliedValue": 5.0})
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slab = ifcopenshell.api.run("root.create_entity", model, ifc_class="IfcSlab")
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# Usually the quantity would be automatically calculated via a
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# graphical authoring application but let's assign a manual quantity
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# for now.
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qto = ifcopenshell.api.run("pset.add_qto", model, product=slab, name="Qto_SlabBaseQuantities")
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ifcopenshell.api.run("pset.edit_qto", model, qto=qto, properties={"NetVolume": 42.0})
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# Now let's parametrically link the slab's quantity to the cost
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# item. If the slab is edited in the future and 42.0 changes, then
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# the updated value will also automatically be applied to the cost
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# item.
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ifcopenshell.api.run("cost.assign_cost_item_quantity", model,
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cost_item=item, products=[slab], prop_name="NetVolume")
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"""
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self.file = file
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self.settings = {"cost_item": cost_item, "products": products or [], "prop_name": prop_name}
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def execute(self):
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if self.settings["prop_name"]:
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self.quantities = set(self.settings["cost_item"].CostQuantities or [])
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for product in self.settings["products"]:
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ifcopenshell.api.run(
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"control.assign_control",
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self.file,
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related_object=product,
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relating_control=self.settings["cost_item"],
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)
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if self.settings["prop_name"]:
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self.add_quantity_from_related_object(product)
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if self.settings["prop_name"]:
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self.settings["cost_item"].CostQuantities = list(self.quantities)
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else:
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self.update_cost_item_count()
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def add_quantity_from_related_object(self, element):
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if not element.is_a("IfcObject"):
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return
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for relationship in element.IsDefinedBy:
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if relationship.is_a("IfcRelDefinesByProperties"):
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self.add_quantity_from_qto(relationship.RelatingPropertyDefinition)
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def add_quantity_from_qto(self, qto):
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if not qto.is_a("IfcElementQuantity"):
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return
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for prop in qto.Quantities:
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if prop.is_a("IfcPhysicalSimpleQuantity") and prop.Name.lower() == self.settings["prop_name"].lower():
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self.quantities.add(prop)
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def update_cost_item_count(self):
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# This is a bold assumption
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# https://forums.buildingsmart.org/t/how-does-a-cost-item-know-that-it-is-counting-a-controlled-product/3564
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if not self.settings["cost_item"].CostQuantities:
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return ifcopenshell.api.run(
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"cost.add_cost_item_quantity",
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self.file,
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cost_item=self.settings["cost_item"],
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ifc_class="IfcQuantityCount",
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)
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if len(self.settings["cost_item"].CostQuantities) == 1:
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quantity = self.settings["cost_item"].CostQuantities[0]
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if quantity.is_a("IfcQuantityCount"):
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count = 0
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for rel in self.settings["cost_item"].Controls:
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count += len(rel.RelatedObjects)
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quantity[3] = count
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