From a9d52b7a70b746137ca6cd477c3903c5382ad59c Mon Sep 17 00:00:00 2001
From: Matthias Koefferlein <matthias@klayout.de>
Date: Fri, 5 Sep 2025 08:05:27 +0200
Subject: [PATCH] Fixing case of point vs. edge in projecting mode

---
 src/db/db/dbEdgePairRelations.cc       |   3 ++-
 testdata/drc/drcSimpleTests_au146.gds  | Bin 7546 -> 7930 bytes
 testdata/drc/drcSimpleTests_au146d.gds | Bin 8910 -> 9294 bytes
 3 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/db/db/dbEdgePairRelations.cc b/src/db/db/dbEdgePairRelations.cc
index 5d32bcc27..de4f46078 100644
--- a/src/db/db/dbEdgePairRelations.cc
+++ b/src/db/db/dbEdgePairRelations.cc
@@ -330,6 +330,7 @@ static bool var_near_part_of_edge (zero_distance_mode zd_mode, db::coord_traits<
   }
 
   //  handle the parallel case
+  //  NOTE: a point is "parallel" to an edge
   if (e.parallel (g)) {
 
     if (std::abs (double (e.distance (g.p1 ()))) >= double (d)) {
@@ -387,7 +388,7 @@ static bool var_near_part_of_edge (zero_distance_mode zd_mode, db::coord_traits<
   l1 = std::max (0.0, l1);
   l2 = std::min (1.0, l2);
 
-  if (l1 >= l2) {
+  if (l1 > l2 + db::epsilon) {
     return false;
   } else {
     if (output) {
diff --git a/testdata/drc/drcSimpleTests_au146.gds b/testdata/drc/drcSimpleTests_au146.gds
index 66262fc23a950bd571f55429ba6cf32ffdf6c9b7..d85bb1933ae7815c9da5a0f5f58d47d1fe5744ac 100644
GIT binary patch
delta 459
zcmZvYJr05}7>3_gsHo9s8kn3&oWu)|cn{-AOdJ|_6C@sicmU&~qepS{3QYDFN^pAM
z{rY@;q0Z}V3I<AdSQ0w?VuTP82)O@TrYrs@zVAP=IDpM4fNVYh#%F*OmL)KG%6CVX
z7YG(W5CLpT(ep!Y{4h3tLzi>kzvjtF9Q_Wmi|(K)?<Se)peZ}(yxXDYv&x)fH{&;S
sdF6Ky=qzYtd6-<}SE?nJYOS67KcVB3wYgkTd1TX4P3*k&AFt%ieg<zV-T(jq

delta 75
zcmexm`^!p+fsKKQDS|<Uk%|2!11AFugE)gUgBdb=qLQjG7U7Li4@D>M7HimSEwP^s
E0N?BmMF0Q*

diff --git a/testdata/drc/drcSimpleTests_au146d.gds b/testdata/drc/drcSimpleTests_au146d.gds
index 8621421d653e54fb6efaa41ea90a9c9f53ee2d1f..7ea9e5329918294c7d7637c7f741075eb3000fbe 100644
GIT binary patch
delta 508
zcmZvZI|>3p42J(5bsvhN*jNZYz|I4B0m0HzJc+Q%Vq-5`ig!>fyoI%eU~MhhD8__g
za7MQJhCh6hker66Q5QaxnxN^a;D!hVgz!+e-|KF#o)Pb-*D#sEuP6ZhY7WS?fWk#H
z2$>zg(B#Z~4ajrZFDqC+5pBfR3_|8sd`*+PemaPjN$kwf2E04>7CyMq&Z5ch&J2G(
z(K{BOxe(u?$z$73;C|2|dW~fXEY4*KKbo9rFTwJOJ|*!r-*aYJd`*)(etL{nS@$`N
Mi)kgZ@NAr;FZ(5a5&!@I

delta 124
zcmX@-an4nVfsKKQDS|<Uk%|2!11AFugE)gUgBdb=qLQjG7U7Li_c<o-<ZPI1$=!lY
Re)9$H$$VHP%A{^^0ssvP6_5Y`