From b07de4f6aff7269cedc7ba1e4269137c96391816 Mon Sep 17 00:00:00 2001
From: Jeff Young <jeff@rokeby.ie>
Date: Sun, 26 May 2024 18:45:40 +0100
Subject: [PATCH] Trim covered region to bounding hull.

Otherwise a long track crossing a footprint will look
like it covers most of it.

Fixes https://gitlab.com/kicad/code/kicad/-/issues/17299

(cherry picked from commit e400d49af6d7796bb49200427f9a8512fa04b0c5)
---
 pcbnew/footprint.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/pcbnew/footprint.cpp b/pcbnew/footprint.cpp
index c96917bb94..70d92f1041 100644
--- a/pcbnew/footprint.cpp
+++ b/pcbnew/footprint.cpp
@@ -2515,6 +2515,8 @@ double FOOTPRINT::CoverageRatio( const GENERAL_COLLECTOR& aCollector ) const
         }
     }
 
+    coveredRegion.BooleanIntersection( footprintRegion, SHAPE_POLY_SET::PM_FAST );
+
     double footprintRegionArea = polygonArea( footprintRegion );
     double uncoveredRegionArea = footprintRegionArea - polygonArea( coveredRegion );
     double coveredArea = footprintRegionArea - uncoveredRegionArea;