From f43eb35d3873438f8520b27ec68b11324e7f0027 Mon Sep 17 00:00:00 2001
From: "qing.zhang" <qing.zhang@bambulab.com>
Date: Tue, 8 Nov 2022 17:54:57 +0800
Subject: [PATCH] ENH: shorten the travel before wipe

Signed-off-by: qing.zhang <qing.zhang@bambulab.com>
Change-Id: I3b8c3e188aae85ead926c02a3edf8d23379fbcb1
---
 src/libslic3r/GCode.cpp | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/libslic3r/GCode.cpp b/src/libslic3r/GCode.cpp
index 8ec81c520..26f04868a 100644
--- a/src/libslic3r/GCode.cpp
+++ b/src/libslic3r/GCode.cpp
@@ -3275,7 +3275,12 @@ std::string GCode::extrude_loop(ExtrusionLoop loop, std::string description, dou
         double l2 = v.squaredNorm();
         // Shift by no more than a nozzle diameter.
         //FIXME Hiding the seams will not work nicely for very densely discretized contours!
-        Point  pt = ((nd * nd >= l2) ? p2 : (p1 + v * (nd / sqrt(l2)))).cast<coord_t>();
+        //BBS. shorten the travel distant before the wipe path
+        double threshold = 0.2;
+        Point  pt = (p1 + v * threshold).cast<coord_t>();
+        if (nd * nd < l2)
+            pt = (p1 + threshold * v * (nd / sqrt(l2))).cast<coord_t>();
+        //Point pt = ((nd * nd >= l2) ? (p1+v*0.4): (p1 + 0.2 * v * (nd / sqrt(l2)))).cast<coord_t>();
         pt.rotate(angle, paths.front().polyline.points.front());
         // generate the travel move
         gcode += m_writer.travel_to_xy(this->point_to_gcode(pt), "move inwards before travel");