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Dion Moult
92 lines
4.1 KiB
Python
92 lines
4.1 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, ifc_class="IfcQuantityCount"):
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"""Adds a new quantity associated with a cost item
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Cost items calculate their subtotal by multiplying the sum of the cost
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item's "values" by the sum of the cost item's "quantities". The
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quantities may be either parametrically linked to quantities measured on
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physical product, or manually specified.
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The quantity must be of a particular type, common examples are:
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- IfcQuantityCount: to count the total occurrences of a product, useful
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for things like doors, windows, and furniture
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- IfcQuantityNumber: any other generic numeric quantity
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- IfcQuantityLength
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- IfcQuantityArea
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- IfcQuantityVolume
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- IfcQuantityWeight
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- IfcQuantityTime
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A cost item must not mix quantities of different types.
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If an IfcQuantityCount is used, then this API will automatically count
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all products that this cost item controls (see
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ifcopenshell.api.controls.assign_control) and prefill that quantity.
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For all other quantity types, the quantity is left as zero and the user
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must either manually specify the quantity or parametrically link it
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using another API call.
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:param cost_item: The IfcCostItem to add the quantity to
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:type cost_item: ifcopenshell.entity_instance.entity_instance
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:param ifc_class: The type of quantity to add
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:type ifc_class: str, optional
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:return: The newly created quantity entity, chosen from the ifc_class
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parameter
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:rtype: ifcopenshell.entity_instance.entity_instance
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Example:
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.. code:: python
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chair = ifcopenshell.api.run("root.create_entity", model, ifc_class="IfcFurniture")
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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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ifcopenshell.api.run("control.assign_control", model,
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relating_control=cost_item, related_object=chair)
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# Let's assume we want to count the amount of chairs to calculate our cost item
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# Because this is an IfcQuantityCount the count will be automatically set to "1" chair
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ifcopenshell.api.run("cost.add_cost_item_quantity", model,
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cost_item=item, ifc_class="IfcQuantityCount")
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"""
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self.file = file
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self.settings = {"cost_item": cost_item, "ifc_class": ifc_class}
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def execute(self):
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quantity = self.file.create_entity(self.settings["ifc_class"], Name="Unnamed")
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quantity[3] = 0.0
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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 self.settings["ifc_class"] == "IfcQuantityCount" and self.settings["cost_item"].Controls:
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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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quantities = list(self.settings["cost_item"].CostQuantities or [])
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quantities.append(quantity)
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self.settings["cost_item"].CostQuantities = quantities
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return quantity
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