From c24832f72b2b636dd7cfb9dce29ef9133b5d3908 Mon Sep 17 00:00:00 2001
From: Seth Hillbrand <seth@kipro-pcb.com>
Date: Thu, 6 Mar 2025 12:44:13 -0800
Subject: [PATCH] Fix IsEffectiveLine calculation
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We sometimes represent circles as 360° arcs.  These are approximately
colinear but are definitely not a line
---
 libs/kimath/src/geometry/shape_arc.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libs/kimath/src/geometry/shape_arc.cpp b/libs/kimath/src/geometry/shape_arc.cpp
index 8c5cadb161..ae3962b125 100644
--- a/libs/kimath/src/geometry/shape_arc.cpp
+++ b/libs/kimath/src/geometry/shape_arc.cpp
@@ -247,7 +247,7 @@ bool SHAPE_ARC::IsEffectiveLine() const
     SEG v1 = SEG( m_start, m_mid );
     SEG v2 = SEG( m_mid, m_end );
 
-    return v1.ApproxCollinear( v2 );
+    return v1.ApproxCollinear( v2 ) && (v1.B - v1.A).Dot(v2.B - v2.A) > 0;
 }