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https://github.com/IfcOpenShell/IfcOpenShell.git
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62 lines
2.7 KiB
Python
62 lines
2.7 KiB
Python
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# 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.util.element
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from ifcopenshell import entity_instance
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def has_zero_length_segment(entity: entity_instance) -> bool:
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"""
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Returns true if the entity ends with a zero length segment. If the entity is an IfcCompositeCurve the IfcCurveSegment.Transition must be DISCONTINUOUS
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:param entity: An IfcAlignmentHorizontal, IfcAlignmentVertical, IfcAlignmentCant or IfcCompositeCurve
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:return: True if the zero length segment is present
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"""
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expected_types = [
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"IfcAlignmentHorizontal",
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"IfcAlignmentVertical",
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"IfcAlignmentCant",
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"IfcCompositeCurve",
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"IfcGradientCurve",
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"IfcSegmentedReferenceCurve",
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]
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if not entity.is_a() in expected_types:
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raise TypeError(
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f"Expected entity type to be one of {[_ for _ in expected_types]}, instead received '{entity.is_a()}"
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)
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if entity.is_a("IfcCompositeCurve"):
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last_segment = entity.Segments[-1]
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return last_segment.Transition == "DISCONTINUOUS" and last_segment.SegmentLength.wrappedValue == 0.0
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else:
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segments = ifcopenshell.util.element.get_components(entity)
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for rel in entity.IsNestedBy:
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if 0 < len(rel.RelatedObjects):
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last_segment = rel.RelatedObjects[-1]
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if last_segment.is_a("IfcAlignmentSegment"):
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if last_segment.DesignParameters.is_a("IfcAlignmentHorizontalSegment"):
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return last_segment.DesignParameters.SegmentLength == 0.0
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elif last_segment.DesignParameters.is_a("IfcAlignmentVerticalSegment"):
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return last_segment.DesignParameters.HorizontalLength == 0.0
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elif last_segment.DesignParameters.is_a("IfcAlignmentCantSegment"):
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return last_segment.DesignParameters.HorizontalLength == 0.0
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return False
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