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fix: use chain tolerance for shape building to handle DXF endpoint gaps

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DXF files can have endpoint gaps at entity junctions that fall right at
the floating-point boundary of Tolerance.Epsilon (0.00001). This caused
shapes to not close, resulting in 0 area and 0% utilization in Best-Fit.

Added ChainTolerance (0.0001) for endpoint chaining in GetConnected and
Shape.IsClosed, keeping the tighter Epsilon for geometric precision.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
AJ Isaacs
2026-03-12 08:37:39 -04:00
parent 9f84357c34
commit d0d334e734
3 changed files with 16 additions and 7 deletions
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7
OpenNest.Core/Geometry/Shape.cs
View File

@@ -26,6 +26,7 @@ namespace OpenNest.Geometry
if (Entities.Count == 0)
return false;
var tol = Math.Tolerance.ChainTolerance;
var first = Entities[0];
Vector firstStartPoint;
Vector firstEndPoint;
@@ -65,7 +66,7 @@ namespace OpenNest.Geometry
case EntityType.Arc:
var arc = (Arc)geo;
if (arc.StartPoint() != endpt)
if (arc.StartPoint().DistanceTo(endpt) > tol)
return false;
endpt = arc.EndPoint();
@@ -77,7 +78,7 @@ namespace OpenNest.Geometry
case EntityType.Line:
var line = (Line)geo;
if (line.StartPoint != endpt)
if (line.StartPoint.DistanceTo(endpt) > tol)
return false;
endpt = line.EndPoint;
@@ -112,7 +113,7 @@ namespace OpenNest.Geometry
return false;
}
return lastEndPoint == firstStartPoint;
return lastEndPoint.DistanceTo(firstStartPoint) <= tol;
}
/// <summary>

10
OpenNest.Core/Helper.cs
View File

@@ -339,6 +339,8 @@ namespace OpenNest
internal static Entity GetConnected(Vector pt, IEnumerable<Entity> geometry)
{
var tol = Math.Tolerance.ChainTolerance;
foreach (var geo in geometry)
{
switch (geo.Type)
@@ -346,10 +348,10 @@ namespace OpenNest
case EntityType.Arc:
var arc = (Arc)geo;
if (arc.StartPoint() == pt)
if (arc.StartPoint().DistanceTo(pt) <= tol)
return arc;
if (arc.EndPoint() == pt)
if (arc.EndPoint().DistanceTo(pt) <= tol)
{
arc.Reverse();
return arc;
@@ -360,10 +362,10 @@ namespace OpenNest
case EntityType.Line:
var line = (Line)geo;
if (line.StartPoint == pt)
if (line.StartPoint.DistanceTo(pt) <= tol)
return line;
if (line.EndPoint == pt)
if (line.EndPoint.DistanceTo(pt) <= tol)
{
line.Reverse();
return line;

6
OpenNest.Core/Math/Tolerance.cs
View File

@@ -6,6 +6,12 @@ namespace OpenNest.Math
{
public const double Epsilon = 0.00001;
/// <summary>
/// Tolerance for chaining entity endpoints when building shapes from DXF imports.
/// Larger than Epsilon to handle floating-point gaps at entity junctions.
/// </summary>
public const double ChainTolerance = 0.0001;
public static bool IsEqualTo(this double a, double b, double tolerance = Epsilon)
{
return System.Math.Abs(b - a) <= tolerance;