alignment api cleanup

updates some documentation
removes some dead code

src/ifcopenshell-python/ifcopenshell/api/alignment/clear_layout_segments.py

@@ -38,8 +38,7 @@ def _is_zero_length_segment(segment: entity_instance) -> bool:
 def clear_layout_segments(file: ifcopenshell.file, layout: entity_instance) -> None:
     """
     Clear all segments from a layout while preserving the layout entity
-    and zero-length terminator. After calling this, use
-    layout_horizontal_alignment_by_pi_method() to add new segments.
+    and zero-length terminator.
 
     This function removes:
     - All real (non-zero-length) IfcAlignmentSegment entities from the layout

src/ifcopenshell-python/ifcopenshell/api/alignment/create_as_polyline.py

@@ -30,91 +30,6 @@ from ifcopenshell.api.alignment._create_polyline_representation import (
 )
 
 
-def _create_layout(file: ifcopenshell.file, alignment: entity_instance, points: Sequence[entity_instance]):
-    """
-    I don't believe it is required for polylines, but the validation serivce gives an error if the alignment doesn't have a layout
-    """
-    include_vertical = False if points[0].Dim == 2 else True
-
-    alignment_layouts = []
-
-    alignment_layouts.append(file.createIfcAlignmentHorizontal(GlobalId=ifcopenshell.guid.new()))
-
-    if include_vertical:
-        alignment_layouts.append(file.createIfcAlignmentVertical(GlobalId=ifcopenshell.guid.new()))
-
-    ifcopenshell.api.nest.assign_object(file, related_objects=alignment_layouts, relating_object=alignment)
-
-    start_dist_along = 0.0
-    for p1, p2 in zip(points, points[1:]):
-        x1, y1, z1 = p1.Coordinates
-        x2, y2, z2 = p2.Coordinates
-        dir = math.atan2(y2 - y1, x2 - x1)
-        gradient = (z2 - z1) / (x2 - x1)
-        length = math.sqrt(math.pow((x2 - x1), 2.0) + math.pow((y2 - y1), 2.0))
-
-        hsegment = file.createIfcAlignmentSegment(
-            ifcopenshell.guid.new(),
-            DesignParameters=file.createIfcAlignmentHorizontalSegment(
-                StartPoint=p1,
-                StartDirection=dir,
-                StartRadiusOfCurvature=0.0,
-                EndRadiusOfCurvature=0.0,
-                SegmentLength=length,
-                PredefinedType="LINE",
-            ),
-        )
-
-        ifcopenshell.api.nest.assign_object(file, related_objects=[hsegment], relating_object=alignment_layouts[0])
-
-        if include_vertical:
-            vsegment = file.createIfcAlignmentSegment(
-                ifcopenshell.guid.new(),
-                DesignParameters=file.createIfcAlignmentVerticalSegment(
-                    StartDistAlong=start_dist_along,
-                    HorizontalLength=length,
-                    StartHeight=z1,
-                    StartGradient=gradient,
-                    EndGradient=gradient,
-                    PredefinedType="CONSTANTGRADIENT",
-                ),
-            )
-
-            ifcopenshell.api.nest.assign_object(file, related_objects=[vsegment], relating_object=alignment_layouts[1])
-
-        start_dist_along += length
-
-    # zero length segment
-    hsegment = file.createIfcAlignmentSegment(
-        ifcopenshell.guid.new(),
-        DesignParameters=file.createIfcAlignmentHorizontalSegment(
-            StartPoint=points[-1],
-            StartDirection=dir,
-            StartRadiusOfCurvature=0.0,
-            EndRadiusOfCurvature=0.0,
-            SegmentLength=0.0,
-            PredefinedType="LINE",
-        ),
-    )
-
-    ifcopenshell.api.nest.assign_object(file, related_objects=[hsegment], relating_object=alignment_layouts[0])
-
-    if include_vertical:
-        vsegment = file.createIfcAlignmentSegment(
-            ifcopenshell.guid.new(),
-            DesignParameters=file.createIfcAlignmentVerticalSegment(
-                StartDistAlong=start_dist_along,
-                HorizontalLength=0.0,
-                StartHeight=points[-1].Coordinates[-1],
-                StartGradient=gradient,
-                EndGradient=gradient,
-                PredefinedType="CONSTANTGRADIENT",
-            ),
-        )
-
-        ifcopenshell.api.nest.assign_object(file, related_objects=[vsegment], relating_object=alignment_layouts[1])
-
-
 def create_as_polyline(
     file: ifcopenshell.file,
     name: str,