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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;
OpenNest.Tests/Geometry/EllipseConverterTests.cs
+24
View File
@@ -2,14 +2,18 @@ using OpenNest.Geometry;
using OpenNest.IO;
using OpenNest.Math;
using Xunit;
using Xunit.Abstractions;
using System.Linq;
namespace OpenNest.Tests.Geometry;
public class EllipseConverterTests
{
private readonly ITestOutputHelper _output;
private const double Tol = 1e-10;
public EllipseConverterTests(ITestOutputHelper output) => _output = output;
[Fact]
public void EvaluatePoint_AtZero_ReturnsMajorAxisEnd()
{
@@ -245,6 +249,26 @@ public class EllipseConverterTests
}
}
[Fact]
public void DxfImport_ArcBoundingBoxes_Diagnostic()
{
var path = @"C:\Users\aisaacs\Desktop\11ga tab.dxf";
if (!System.IO.File.Exists(path)) return;
var result = Dxf.Import(path);
var all = (System.Collections.Generic.IEnumerable<IBoundable>)result.Entities;
var bbox = all.GetBoundingBox();
_output.WriteLine($"Overall: X={bbox.X:F4} Y={bbox.Y:F4} W={bbox.Length:F4} H={bbox.Width:F4}");
for (var i = 0; i < result.Entities.Count; i++)
{
var e = result.Entities[i];
var b = e.BoundingBox;
var flag = (b.Length > 1 || b.Width > 1) ? " ***" : "";
_output.WriteLine($"{i + 1,3}. {e.GetType().Name,-8} X={b.X:F4} Y={b.Y:F4} W={b.Length:F4} H={b.Width:F4}{flag}");
}
}
[Fact]
public void ToOpenNest_FlippedNormalZ_ProducesCorrectArcs()
{