From d34c9cec9a31faffc9af82f5d4317599b2e147e1 Mon Sep 17 00:00:00 2001
From: enricoturri1966 <enricoturri@seznam.cz>
Date: Fri, 22 Oct 2021 14:29:56 +0200
Subject: [PATCH] Follow-up of decdaa82d3db9619b45d3c59d5106526cf65d57d - Use
 normalized vectors

---
 src/libslic3r/Line.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/libslic3r/Line.cpp b/src/libslic3r/Line.cpp
index 78ca2b9af..773df3442 100644
--- a/src/libslic3r/Line.cpp
+++ b/src/libslic3r/Line.cpp
@@ -67,7 +67,7 @@ bool Line::parallel_to(const Line& line) const
 {
     const Vec2d v1 = (this->b - this->a).cast<double>();
     const Vec2d v2 = (line.b - line.a).cast<double>();
-    return std::fabs(cross2(v1, v2)) < EPSILON;
+    return sqr(cross2(v1, v2)) < sqr(EPSILON) * v1.squaredNorm() * v2.squaredNorm();
 }
 
 #if ENABLE_OUT_OF_BED_DETECTION_IMPROVEMENTS
@@ -80,7 +80,7 @@ bool Line::perpendicular_to(const Line& line) const
 {
     const Vec2d v1 = (this->b - this->a).cast<double>();
     const Vec2d v2 = (line.b - line.a).cast<double>();
-    return std::fabs(v1.dot(v2)) < EPSILON;
+    return sqr(v1.dot(v2)) < sqr(EPSILON) * v1.squaredNorm() * v2.squaredNorm();
 }
 #endif // ENABLE_OUT_OF_BED_DETECTION_IMPROVEMENTS