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fix(ui): compute polylabel once from unrotated drawing

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Compute the label point from the base drawing's unrotated program
and rotate the cached point instead of recomputing on each rotation.
Prevents label jitter caused by arc discretization differences.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
AJ Isaacs
2026-03-16 20:55:29 -04:00
parent 79a3410bb9
commit 5553fe6386
1 changed files with 6 additions and 14 deletions
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20
OpenNest/LayoutPart.cs
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@@ -46,16 +46,7 @@ namespace OpenNest
Color = part.BaseDrawing.Color;
}
private bool _isDirty;
internal bool IsDirty
{
get => _isDirty;
set
{
_isDirty = value;
if (value) _labelPoint = null;
}
}
internal bool IsDirty { get; set; }
public bool IsSelected { get; set; }
@@ -119,14 +110,14 @@ namespace OpenNest
private Vector ComputeLabelPoint()
{
var entities = ConvertProgram.ToGeometry(BasePart.Program);
var entities = ConvertProgram.ToGeometry(BasePart.BaseDrawing.Program);
var nonRapid = entities.Where(e => e.Layer != SpecialLayers.Rapid).ToList();
var shapes = ShapeBuilder.GetShapes(nonRapid);
if (shapes.Count == 0)
{
var bbox = BasePart.Program.BoundingBox();
var bbox = BasePart.BaseDrawing.Program.BoundingBox();
return new Vector(bbox.Location.X + bbox.Width / 2, bbox.Location.Y + bbox.Length / 2);
}
@@ -151,9 +142,10 @@ namespace OpenNest
Path.Transform(plateView.Matrix);
_labelPoint ??= ComputeLabelPoint();
var rotatedLabel = _labelPoint.Value.Rotate(BasePart.Rotation);
var labelPt = new PointF(
(float)(_labelPoint.Value.X + BasePart.Location.X),
(float)(_labelPoint.Value.Y + BasePart.Location.Y));
(float)(rotatedLabel.X + BasePart.Location.X),
(float)(rotatedLabel.Y + BasePart.Location.Y));
var pts = new[] { labelPt };
plateView.Matrix.TransformPoints(pts);
_labelScreenPoint = pts[0];