152 lines
5.5 KiB
Python
152 lines
5.5 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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import math
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from collections.abc import Sequence
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import ifcopenshell
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import ifcopenshell.api.aggregate
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import ifcopenshell.api.alignment
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import ifcopenshell.api.nest
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import ifcopenshell.util.alignment
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from ifcopenshell import entity_instance
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from ifcopenshell.api.alignment._create_polyline_representation import (
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_create_polyline_representation,
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)
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def _create_layout(file: ifcopenshell.file, alignment: entity_instance, points: Sequence[entity_instance]):
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"""
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I don't believe it is required for polylines, but the validation serivce gives an error if the alignment doesn't have a layout
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"""
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include_vertical = False if points[0].Dim == 2 else True
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alignment_layouts = []
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alignment_layouts.append(file.createIfcAlignmentHorizontal(GlobalId=ifcopenshell.guid.new()))
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if include_vertical:
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alignment_layouts.append(file.createIfcAlignmentVertical(GlobalId=ifcopenshell.guid.new()))
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ifcopenshell.api.nest.assign_object(file, related_objects=alignment_layouts, relating_object=alignment)
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start_dist_along = 0.0
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for p1, p2 in zip(points, points[1:]):
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x1, y1, z1 = p1.Coordinates
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x2, y2, z2 = p2.Coordinates
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dir = math.atan2(y2 - y1, x2 - x1)
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gradient = (z2 - z1) / (x2 - x1)
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length = math.sqrt(math.pow((x2 - x1), 2.0) + math.pow((y2 - y1), 2.0))
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hsegment = file.createIfcAlignmentSegment(
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ifcopenshell.guid.new(),
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DesignParameters=file.createIfcAlignmentHorizontalSegment(
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StartPoint=p1,
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StartDirection=dir,
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StartRadiusOfCurvature=0.0,
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EndRadiusOfCurvature=0.0,
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SegmentLength=length,
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PredefinedType="LINE",
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),
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)
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ifcopenshell.api.nest.assign_object(file, related_objects=[hsegment], relating_object=alignment_layouts[0])
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if include_vertical:
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vsegment = file.createIfcAlignmentSegment(
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ifcopenshell.guid.new(),
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DesignParameters=file.createIfcAlignmentVerticalSegment(
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StartDistAlong=start_dist_along,
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HorizontalLength=length,
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StartHeight=z1,
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StartGradient=gradient,
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EndGradient=gradient,
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PredefinedType="CONSTANTGRADIENT",
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),
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)
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ifcopenshell.api.nest.assign_object(file, related_objects=[vsegment], relating_object=alignment_layouts[1])
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start_dist_along += length
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# zero length segment
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hsegment = file.createIfcAlignmentSegment(
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ifcopenshell.guid.new(),
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DesignParameters=file.createIfcAlignmentHorizontalSegment(
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StartPoint=points[-1],
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StartDirection=dir,
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StartRadiusOfCurvature=0.0,
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EndRadiusOfCurvature=0.0,
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SegmentLength=0.0,
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PredefinedType="LINE",
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),
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)
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ifcopenshell.api.nest.assign_object(file, related_objects=[hsegment], relating_object=alignment_layouts[0])
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if include_vertical:
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vsegment = file.createIfcAlignmentSegment(
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ifcopenshell.guid.new(),
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DesignParameters=file.createIfcAlignmentVerticalSegment(
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StartDistAlong=start_dist_along,
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HorizontalLength=0.0,
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StartHeight=points[-1].Coordinates[-1],
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StartGradient=gradient,
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EndGradient=gradient,
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PredefinedType="CONSTANTGRADIENT",
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),
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)
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ifcopenshell.api.nest.assign_object(file, related_objects=[vsegment], relating_object=alignment_layouts[1])
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def create_as_polyline(
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file: ifcopenshell.file,
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name: str,
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points: Sequence[entity_instance],
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start_station: float = 0.0,
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) -> entity_instance:
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"""
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Creates a new IfcAlignment with an IfcPolyline representation.
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The IfcAlignment is aggreated to IfcProject
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:param file:
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:param name: name assigned to IfcAlignment.Name
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:param points: sequence of points defining the polyline
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:param start_station: station value at the start of the alignment
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:return: Returns an IfcAlignment
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"""
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alignment = file.createIfcAlignment(
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GlobalId=ifcopenshell.guid.new(),
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Name=name,
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)
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_create_polyline_representation(file, alignment, points)
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# define stationing
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name = ifcopenshell.util.alignment.station_as_string(file, start_station)
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referent = ifcopenshell.api.alignment.add_stationing_referent(file, alignment, 0.0, start_station, name, alignment)
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# IFC 4.1.4.1.1 Alignment Aggregation To Project
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project = file.by_type("IfcProject")[0]
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if project:
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ifcopenshell.api.aggregate.assign_object(file, products=[alignment], relating_object=project)
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return alignment
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