50 lines
2.1 KiB
Python
50 lines
2.1 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.util.representation
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from ifcopenshell import entity_instance
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def get_curve(alignment: entity_instance) -> entity_instance:
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"""
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Returns the geometric representation curve for an alignment.
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An alignment without layouts will have a curve of type IfcPolyLine or IfcIndexedPolyCurve
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A horizontal only will have a curve of type IfcCompositeCurve
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A horizontal+vertical will have a curve of type IfcGradientCurve
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A horizontal+vertical+cant will have a curve of tyep IfcSegmentedReferenceCurve
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:param alignment: The alignment
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:return: The geometric representation of the alignemnt or None if the alignment does not have a representation
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Example:
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.. code:: python
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alignment = model.by_type("IfcAlignment")[0]
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gradient_curve = ifcopenshell.api.alignment.get_curve(alignment)
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"""
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axis = None
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representations = ifcopenshell.util.representation.get_representations_iter(alignment)
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for representation in representations:
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if representation.RepresentationIdentifier == "Axis" and (
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representation.RepresentationType == "Curve2D" or representation.RepresentationType == "Curve3D"
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):
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axis = representation
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break
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return None if axis == None or len(axis.Items) == 0 else axis.Items[0]
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