mirror of
https://github.com/IfcOpenShell/IfcOpenShell.git
synced 2026-08-09 17:31:45 +00:00
Andrej730
78 lines
3.2 KiB
Python
78 lines
3.2 KiB
Python
# IfcOpenShell - IFC toolkit and geometry engine
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# Copyright (C) 2025 Thomas Krijnen <thomas@aecgeeks.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
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import ifcopenshell.api.alignment
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import ifcopenshell.api.geometry
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from ifcopenshell import entity_instance
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import math
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from collections.abc import Sequence
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def _get_cant_segment(horizontal_segment: entity_instance) -> entity_instance:
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"""
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Returns the IfcAlignmentSegment from the cant layout that corresponds to horizontal_segment.
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Returns None if the cant segment cannot be found
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"""
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expected_type = "IfcAlignmentSegment"
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if not horizontal_segment.is_a(expected_type):
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raise TypeError(f"Expected {expected_type} but got {horizontal_segment.is_a()}")
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if not horizontal_segment.DesignParameters.is_a("IfcAlignmentHorizontalSegment"):
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raise TypeError(
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f"Expect DesignParameter to be IfcAlignmentHorizontal but got {horizontal_segment.DesignParameters.is_a()}"
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)
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# get the index of horizontal_segment in the horizontal_layout
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horizontal_layout = horizontal_segment.Nests[0].RelatingObject
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index = 0
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for segment in horizontal_layout.IsNestedBy[0].RelatedObjects:
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if segment == horizontal_segment:
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break
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else:
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index += 1
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cant_segment = None
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# first check CT 4.1.4.4.1.1 Alignment Layout - Horizontal, Vertical and Cant
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nests_layouts = horizontal_layout.Nests[0]
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for layout in nests_layouts.RelatedObjects:
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if layout.is_a("IfcAlignmentCant"):
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cant_segment = layout.IsNestedBy[0].RelatedObjects[index]
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break
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# if a cant_segment wasn't found, check CT 4.1.4.4.1.2 Alignment Layout - Reusing Horizontal Layout
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# Note that nothing forbids multiple child alignments to have cant layouts. However, this would not make
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# sense for Viennese Bend because the Viennese Bend cant segment influences the geometry of the horizontal
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# Viennese Bend transition curve segment. The horizontal geometry would not be unique if there are
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# multiple child alignments with cant layouts.
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# For this reason, use the first cant layout found
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if cant_segment == None:
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alignment = ifcopenshell.api.alignment.get_alignment(horizontal_layout)
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for child_alignment in alignment.IsDecomposedBy[0].RelatedObjects:
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for layout in child_alignment.Nests[0].RelatedObjects:
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if layout.is_a("IfcAlignmentCant"):
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cant_segment = layout.IsNestedBy[0].RelatedObjects[index]
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break
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if cant_segment:
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break
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return cant_segment
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