From 70478ec9461f4b8ecf4809ade92d297b631452f9 Mon Sep 17 00:00:00 2001
From: komal0000 <komalstha0000@gmail.com>
Date: Sun, 25 Oct 2026 11:39:13 +0545
Subject: [PATCH] Explode a bulge over a zero-length segment as a line

---
 src/ACadSharp.Tests/Entities/LwPolylineTest.cs | 17 +++++++++++++++++
 src/ACadSharp/Extensions/PolylineExtensions.cs |  9 +++++----
 2 files changed, 22 insertions(+), 4 deletions(-)

diff --git a/src/ACadSharp.Tests/Entities/LwPolylineTest.cs b/src/ACadSharp.Tests/Entities/LwPolylineTest.cs
index e6a525036..74011b754 100644
--- a/src/ACadSharp.Tests/Entities/LwPolylineTest.cs
+++ b/src/ACadSharp.Tests/Entities/LwPolylineTest.cs
@@ -115,6 +115,23 @@ public void ExplodeClosedInLines()
 		}
 	}
 
+	[Fact]
+	public void ExplodeBulgeOverZeroLengthSegment()
+	{
+		LwPolyline lwPolyline = new LwPolyline();
+		lwPolyline.Vertices.Add(new LwPolyline.Vertex(new XY(0, 0)) { Bulge = 1.0 });
+		lwPolyline.Vertices.Add(new LwPolyline.Vertex(new XY(0, 0)));
+		lwPolyline.Vertices.Add(new LwPolyline.Vertex(new XY(10, 0)));
+
+		List<Entity> entities = lwPolyline.Explode().ToList();
+
+		Assert.Equal(2, entities.Count);
+		Line l = Assert.IsType<Line>(entities[0]);
+		Assert.Equal(XYZ.Zero, l.StartPoint);
+		Assert.Equal(XYZ.Zero, l.EndPoint);
+		Assert.IsType<Line>(entities[1]);
+	}
+
 	public override void GetBoundingBoxTest()
 	{
 	}
diff --git a/src/ACadSharp/Extensions/PolylineExtensions.cs b/src/ACadSharp/Extensions/PolylineExtensions.cs
index 426fee5bf..c1b738d50 100644
--- a/src/ACadSharp/Extensions/PolylineExtensions.cs
+++ b/src/ACadSharp/Extensions/PolylineExtensions.cs
@@ -32,8 +32,12 @@ public static IEnumerable<Entity> Explode(this IPolyline polyline)
 					break;
 				}
 
+				XY p1 = curr.Location.Convert<XY>();
+				XY p2 = next.Location.Convert<XY>();
+
 				Entity e = null;
-				if (curr.Bulge == 0)
+				//A bulge over a zero-length segment has no arc to create
+				if (curr.Bulge == 0 || p1.Equals(p2))
 				{
 					//Is a line
 					e = new Line
@@ -46,9 +50,6 @@ public static IEnumerable<Entity> Explode(this IPolyline polyline)
 				}
 				else
 				{
-					XY p1 = curr.Location.Convert<XY>();
-					XY p2 = next.Location.Convert<XY>();
-
 					//Is an arc
 					Arc arc = Arc.CreateFromBulge(p1, p2, curr.Bulge);
 					arc.Center = new XYZ(arc.Center.X, arc.Center.Y, polyline.Elevation);