61 lines
2.5 KiB
Python
61 lines
2.5 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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from collections.abc import Sequence
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import ifcopenshell.api.alignment
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from ifcopenshell import entity_instance
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def _get_curve_segment_count(segment: entity_instance) -> int:
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"""
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returns the number of IfcCurveSegment that an IfcAlignmentSegment maps to.
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generally this is a 1 to 1 mapping, with helmert curve being the exception
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"""
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if segment.DesignParameters.is_a("IfcAlignmentHorizontalSegment"):
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return 2 if segment.DesignParameters.PredefinedType == "HELMERTCURVE" else 1
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elif segment.DesignParameters.is_a("IfcAlignmentVerticalSegment"):
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return 1
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elif segment.DesignParameters.is_a("IfcAlignmentCantSegment"):
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return 2 if segment.DesignParameters.PredefinedType == "HELMERTCURVE" else 1
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def get_mapped_segments(layout_segment: entity_instance) -> Sequence[entity_instance]:
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"""
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From an IfcAlignmentSegment, returns the related IfcCurveSegment. Typically the sequence has one entity,
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however there will be two for Helmert curve
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"""
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expected_type = "IfcAlignmentSegment"
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if not layout_segment.is_a(expected_type):
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raise TypeError(f"Expected to see type '{expected_type}', instead received '{layout_segment.is_a()}'.")
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layout = layout_segment.Nests[0].RelatingObject
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curve = ifcopenshell.api.alignment.get_layout_curve(layout)
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index = 0
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for seg in layout.IsNestedBy[0].RelatedObjects:
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index += _get_curve_segment_count(seg)
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if seg == layout_segment:
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break
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segment_count = _get_curve_segment_count(layout_segment)
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if segment_count == 1:
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return (curve.Segments[index - segment_count], None)
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else:
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return (curve.Segments[index - segment_count], curve.Segments[index])
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