From 5eb2a33498b8cb5fd20478357ff5f63e15cf5525 Mon Sep 17 00:00:00 2001
From: Seth Hillbrand <hillbrand@ucdavis.edu>
Date: Sun, 31 Mar 2019 22:12:51 -0700
Subject: [PATCH] pcbnew: Ensure DRC circles have at least 4 points

This prevents invalid outline errors for small circles.

Fixes: lp:1822641
* https://bugs.launchpad.net/kicad/+bug/1822641
---
 pcbnew/convert_drawsegment_list_to_polygon.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/pcbnew/convert_drawsegment_list_to_polygon.cpp b/pcbnew/convert_drawsegment_list_to_polygon.cpp
index 8bff699c00..9db9c717e7 100644
--- a/pcbnew/convert_drawsegment_list_to_polygon.cpp
+++ b/pcbnew/convert_drawsegment_list_to_polygon.cpp
@@ -324,7 +324,7 @@ bool ConvertOutlineToPolygon( std::vector<DRAWSEGMENT*>& aSegList, SHAPE_POLY_SE
     // Output the Edge.Cuts perimeter as circle or polygon.
     if( graphic->GetShape() == S_CIRCLE )
     {
-        int steps = GetArcToSegmentCount( graphic->GetRadius(), aTolerance, 360.0 );
+        int steps = std::max<int>( 4, GetArcToSegmentCount( graphic->GetRadius(), aTolerance, 360.0 ) );
         TransformCircleToPolygon( aPolygons, graphic->GetCenter(), graphic->GetRadius(), steps );
     }
     else if( graphic->GetShape() == S_POLYGON )
@@ -530,7 +530,7 @@ bool ConvertOutlineToPolygon( std::vector<DRAWSEGMENT*>& aSegList, SHAPE_POLY_SE
             double   angle   = 3600.0;
             wxPoint  start   = center;
             int      radius  = graphic->GetRadius();
-            int      steps   = GetArcToSegmentCount( radius, aTolerance, 360.0 );
+            int      steps   = std::max<int>( 4, GetArcToSegmentCount( radius, aTolerance, 360.0 ) );
             wxPoint  nextPt;
 
             start.x += radius;