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fix(core): arc bounding box inflated for near-zero sweep arcs

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Arcs with sweep angles smaller than Tolerance.Epsilon were treated as
full circles by IsBetweenRad's shortcut check, causing UpdateBounds to
expand the bounding box to Center ± Radius. This made zoom-to-fit zoom
out far beyond the actual part extents.

Skip cardinal angle expansion when sweep is near-zero so the bounding
box uses only the arc's start/end points.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
AJ Isaacs
2026-04-23 08:20:39 -04:00
parent ca67b1bd29
commit 4053f1f989
2 changed files with 41 additions and 14 deletions
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OpenNest.Core/Geometry/Arc.cs
+17 -14
View File
@@ -404,26 +404,29 @@ namespace OpenNest.Geometry
maxY = startpt.Y;
}
var angle1 = StartAngle;
var angle2 = EndAngle;
var sweep = SweepAngle();
if (sweep > Tolerance.Epsilon)
{
var angle1 = StartAngle;
var angle2 = EndAngle;
// switch the angle to counter clockwise.
if (IsReversed)
Generic.Swap(ref angle1, ref angle2);
if (IsReversed)
Generic.Swap(ref angle1, ref angle2);
if (Angle.IsBetweenRad(Angle.HalfPI, angle1, angle2))
maxY = Center.Y + Radius;
if (Angle.IsBetweenRad(Angle.HalfPI, angle1, angle2))
maxY = Center.Y + Radius;
if (Angle.IsBetweenRad(System.Math.PI, angle1, angle2))
minX = Center.X - Radius;
if (Angle.IsBetweenRad(System.Math.PI, angle1, angle2))
minX = Center.X - Radius;
const double oneHalfPI = System.Math.PI * 1.5;
const double oneHalfPI = System.Math.PI * 1.5;
if (Angle.IsBetweenRad(oneHalfPI, angle1, angle2))
minY = Center.Y - Radius;
if (Angle.IsBetweenRad(oneHalfPI, angle1, angle2))
minY = Center.Y - Radius;
if (Angle.IsBetweenRad(Angle.TwoPI, angle1, angle2))
maxX = Center.X + Radius;
if (Angle.IsBetweenRad(Angle.TwoPI, angle1, angle2))
maxX = Center.X + Radius;
}
boundingBox.X = minX;
boundingBox.Y = minY;