mirror of
https://github.com/IfcOpenShell/IfcOpenShell.git
synced 2026-08-09 09:21:46 +00:00
Stephen Boddy
207 lines
9.0 KiB
Python
207 lines
9.0 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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import ifcopenshell
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import ifcopenshell.api.alignment
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from ifcopenshell.api.alignment._get_segment_endpoint import _get_segment_endpoint
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from ifcopenshell.api.alignment._update_zero_length_segment_placement import _update_zero_length_segment_placement
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import ifcopenshell.api.nest
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import ifcopenshell.util.unit
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from ifcopenshell import entity_instance
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from ifcopenshell.api.alignment._update_curve_segment_transition_code import (
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_update_curve_segment_transition_code,
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)
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def add_zero_length_segment(file: ifcopenshell.file, layout: entity_instance) -> bool:
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"""
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Adds a zero length segment to the end of a layout.
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If the layout already has a zero length segment, nothing is changed.
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:param layout: An IfcAlignmentHorizontal, IfcAlignmentVertical, IfcAlignmentCant, IfcCompositeCurve, IfcGradientCurve, IfcSegmentedReferenceCurve
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:return: True if segment is added
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"""
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# These are valid curve types for alignment, but don't have the zero-length segment
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if layout.is_a("IfcOffsetCurveByDistances") or layout.is_a("IfcPolyline") or layout.is_a("IfcIndexedPolyCurve"):
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return
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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 layout.is_a() in expected_types:
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raise TypeError(
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f"Expected layout type to be one of {[_ for _ in expected_types]}, instead received {layout.is_a()}"
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)
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if ifcopenshell.api.alignment.has_zero_length_segment(layout):
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return False
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if layout.is_a("IfcCompositeCurve") or layout.is_a("IfcGradientCurve") or layout.is_a("IfcSegmentedReferenceCurve"):
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parent_curve = file.createIfcLine(
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Pnt=file.createIfcCartesianPoint(Coordinates=((0.0, 0.0))),
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Dir=file.createIfcVector(
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Orientation=file.createIfcDirection(DirectionRatios=((1.0, 0.0))),
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Magnitude=1.0,
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),
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)
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if layout.is_a("IfcSegmentedReferenceCurve"):
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placement = file.createIfcAxis2Placement3D(
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Location=file.createIfcCartesianPoint((0.0, 0.0, 0.0)),
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RefDirection=file.createIfcDirection((1.0, 0.0, 0.0)),
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Axis=file.createIfcDirection((0.0, 0.0, 1.0)),
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)
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else:
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placement = file.createIfcAxis2Placement2D(
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Location=file.createIfcCartesianPoint((0.0, 0.0)),
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RefDirection=file.createIfcDirection((1.0, 0.0)),
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)
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zero_length_curve_segment = file.createIfcCurveSegment(
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Transition="DISCONTINUOUS",
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Placement=placement,
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SegmentStart=file.createIfcLengthMeasure(0.0),
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SegmentLength=file.createIfcLengthMeasure(0.0),
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ParentCurve=parent_curve,
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)
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if layout.Segments and 0 < len(layout.Segments):
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# If there are segments, get the last segment and compute the end point and tangent direction
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# because this becomes of placement of the zero length segment
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last_segment = layout.Segments[-1]
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end_point = _get_segment_endpoint(file, last_segment)
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_update_zero_length_segment_placement(file, zero_length_curve_segment, end_point)
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_update_curve_segment_transition_code(last_segment, zero_length_curve_segment)
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layout.Segments += (zero_length_curve_segment,)
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# add zero length segments to base curves
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if layout.is_a("IfcSegmentedReferenceCurve"):
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ifcopenshell.api.alignment.add_zero_length_segment(file, layout.BaseCurve)
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elif layout.is_a("IfcGradientCurve"):
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ifcopenshell.api.alignment.add_zero_length_segment(file, layout.BaseCurve)
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else:
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zero_length_curve_segment = None
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if layout.is_a("IfcAlignmentHorizontal"):
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x = 0.0
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y = 0.0
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dx = 1.0
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dy = 0.0
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last_segment = None
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for rel in layout.IsNestedBy:
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if 0 < len(rel.RelatedObjects):
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last_segment = rel.RelatedObjects[-1]
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break
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if last_segment:
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e = _get_segment_endpoint(file, last_segment)
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unit_scale = ifcopenshell.util.unit.calculate_unit_scale(file)
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x = float(e[0, 3]) / unit_scale
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y = float(e[1, 3]) / unit_scale
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dx = float(e[0, 0])
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dy = float(e[1, 0])
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angle_unit_scale = ifcopenshell.util.unit.calculate_unit_scale(file, "PLANEANGLEUNIT")
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design_parameters = file.createIfcAlignmentHorizontalSegment(
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StartPoint=file.createIfcCartesianPoint((x, y)),
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StartDirection=math.atan2(dy, dx) / angle_unit_scale,
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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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zero_length_curve_segment = file.createIfcAlignmentSegment(
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GlobalId=ifcopenshell.guid.new(), DesignParameters=design_parameters
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)
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elif layout.is_a("IfcAlignmentVertical"):
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last_segment_dist_along = 0.0
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last_segment_height = 0.0
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last_segment_end_gradient = 0.0
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last_segment = None
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for rel in layout.IsNestedBy:
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if 0 < len(rel.RelatedObjects):
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last_segment = rel.RelatedObjects[-1]
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break
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if last_segment:
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last_segment_dist_along = (
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last_segment.DesignParameters.StartDistAlong + last_segment.DesignParameters.HorizontalLength
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)
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last_segment_end_gradient = last_segment.DesignParameters.EndGradient
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e = _get_segment_endpoint(file, last_segment)
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unit_scale = ifcopenshell.util.unit.calculate_unit_scale(file)
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last_segment_height = float(e[1, 3]) / unit_scale
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design_parameters = file.createIfcAlignmentVerticalSegment(
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StartDistAlong=last_segment_dist_along,
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HorizontalLength=0.0,
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StartHeight=last_segment_height,
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StartGradient=last_segment_end_gradient,
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EndGradient=last_segment_end_gradient,
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PredefinedType="CONSTANTGRADIENT",
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)
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zero_length_curve_segment = file.createIfcAlignmentSegment(
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GlobalId=ifcopenshell.guid.new(), DesignParameters=design_parameters
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)
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elif layout.is_a("IfcAlignmentCant"):
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last_segment_dist_along = 0.0
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last_segment_cant_left = 0.0
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last_segment_cant_right = 0.0
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for rel in layout.IsNestedBy:
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if 0 < len(rel.RelatedObjects):
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last_segment = rel.RelatedObjects[-1]
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last_segment_dist_along = (
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last_segment.DesignParameters.StartDistAlong + last_segment.DesignParameters.HorizontalLength
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)
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last_segment_cant_left = (
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last_segment.DesignParameters.EndCantLeft
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if last_segment.DesignParameters.EndCantLeft != None
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else last_segment.DesignParameters.StartCantLeft
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)
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last_segment_cant_right = (
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last_segment.DesignParameters.EndCantRight
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if last_segment.DesignParameters.EndCantRight != None
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else last_segment.DesignParameters.StartCantRight
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)
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break
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design_parameters = file.createIfcAlignmentCantSegment(
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StartDistAlong=last_segment_dist_along,
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HorizontalLength=0.0,
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StartCantLeft=last_segment_cant_left,
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StartCantRight=last_segment_cant_right,
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PredefinedType="CONSTANTCANT",
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)
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zero_length_curve_segment = file.createIfcAlignmentSegment(
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GlobalId=ifcopenshell.guid.new(), DesignParameters=design_parameters
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)
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ifcopenshell.api.nest.assign_object(file, related_objects=[zero_length_curve_segment], relating_object=layout)
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return True
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