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feat: adaptive arc segmentation based on chord tolerance

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Add SegmentsForTolerance(double) to Arc and Circle that calculates the
minimum segments needed to keep sagitta within the given tolerance.
Add Shape.ToPolygonWithTolerance() that uses it per arc/circle.

Push distance now uses 0.08" chord tolerance instead of a fixed segment
count, giving appropriate resolution for each arc based on its radius.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
AJ Isaacs
2026-03-06 18:59:30 -05:00
parent ec5eff4884
commit 28238cc246
4 changed files with 72 additions and 3 deletions
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6
OpenNest.Core/Helper.cs
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@@ -739,7 +739,7 @@ namespace OpenNest
return pts.Count > 0;
}
private const int PushArcSegments = 36;
private const double PushChordTolerance = 0.08;
public static List<Line> GetPartLines(Part part)
{
@@ -749,7 +749,7 @@ namespace OpenNest
foreach (var shape in shapes)
{
var polygon = shape.ToPolygon(PushArcSegments);
var polygon = shape.ToPolygonWithTolerance(PushChordTolerance);
polygon.Offset(part.Location);
lines.AddRange(polygon.ToLines());
}
@@ -770,7 +770,7 @@ namespace OpenNest
if (offsetEntity == null)
continue;
var polygon = offsetEntity.ToPolygon(PushArcSegments);
var polygon = offsetEntity.ToPolygonWithTolerance(PushChordTolerance);
polygon.Offset(part.Location);
lines.AddRange(polygon.ToLines());
}