From 0143d532fe874309139873e245549e4ac3a4cf44 Mon Sep 17 00:00:00 2001
From: supermerill <merill@fr.fr>
Date: Mon, 3 Dec 2018 14:09:21 +0100
Subject: [PATCH] correct error with Polygon / ExPolygon

---
 xs/src/libslic3r/ExPolygon.cpp          |  6 +++---
 xs/src/libslic3r/MedialAxis.hpp         |  3 ++-
 xs/src/libslic3r/PerimeterGenerator.cpp | 11 ++++++-----
 3 files changed, 11 insertions(+), 9 deletions(-)

diff --git a/xs/src/libslic3r/ExPolygon.cpp b/xs/src/libslic3r/ExPolygon.cpp
index 8eef314e0d..87c119a04f 100644
--- a/xs/src/libslic3r/ExPolygon.cpp
+++ b/xs/src/libslic3r/ExPolygon.cpp
@@ -191,16 +191,16 @@ void
 ExPolygon::remove_point_too_near(const coord_t tolerance) {
     size_t id = 1;
     while (id < this->contour.points.size() - 1) {
-        size_t newdist = min(this->contour.points[id].distance_to(this->contour.points[id - 1])
+        double newdist = min(this->contour.points[id].distance_to(this->contour.points[id - 1])
             , this->contour.points[id].distance_to(this->contour.points[id + 1]));
-        if (newdist < tolerance) {
+        if (newdist < (double)tolerance) {
             this->contour.points.erase(this->contour.points.begin() + id);
             newdist = this->contour.points[id].distance_to(this->contour.points[id - 1]);
         }
         //go to next one
         //if you removed a point, it check if the next one isn't too near from the previous one.
         // if not, it byepass it.
-        if (newdist > tolerance) {
+        if (newdist > (double)tolerance) {
             ++id;
         }
     }
diff --git a/xs/src/libslic3r/MedialAxis.hpp b/xs/src/libslic3r/MedialAxis.hpp
index c65cbdb84b..93f6725db2 100644
--- a/xs/src/libslic3r/MedialAxis.hpp
+++ b/xs/src/libslic3r/MedialAxis.hpp
@@ -17,8 +17,9 @@ namespace Slic3r {
     public:
         Lines lines; //lines is here only to avoid appassing it in argument of amny method. Initialized in polyline_from_voronoi.
         ExPolygon expolygon;
-        const ExPolygon& bounds;
+		
         const ExPolygon& surface;
+        const ExPolygon& bounds;
         const double max_width;
         const double min_width;
         const double height;
diff --git a/xs/src/libslic3r/PerimeterGenerator.cpp b/xs/src/libslic3r/PerimeterGenerator.cpp
index 165708929a..31ac2eaf2f 100644
--- a/xs/src/libslic3r/PerimeterGenerator.cpp
+++ b/xs/src/libslic3r/PerimeterGenerator.cpp
@@ -121,20 +121,21 @@ PerimeterGenerator::process()
                         // medial axis requires non-overlapping geometry
                         Polygons thin_zones = diff(last, no_thin_zone, true);
                         //don't use offset2_ex, because we don't want to merge the zones that have been separated.
-                        Polygons expp = offset(thin_zones, (float)(-min_width / 2));
+                        ExPolygons expp = offset_ex(thin_zones, (float)(-min_width / 2));
                         //we push the bits removed and put them into what we will use as our anchor
                         if (expp.size() > 0) {
-                            no_thin_zone = diff(last, offset(expp, (float)(min_width / 2)), true);
+                            no_thin_zone = diff(last, to_polygons(offset_ex(expp, (float)(min_width / 2))), true);
                         }
                         // compute a bit of overlap to anchor thin walls inside the print.
-                        for (Polygon &ex : expp) {
+                        for (ExPolygon &ex : expp) {
                             //growing back the polygon
                             //a very little bit of overlap can be created here with other thin polygons, but it's more useful than worisome.
                             ex.remove_point_too_near(SCALED_RESOLUTION);
                             ExPolygons ex_bigger = offset_ex(ex, (float)(min_width / 2));
                             if (ex_bigger.size() != 1) continue; // impossible error, growing a single polygon can't create multiple or 0.
-                            ExPolygons anchor = intersection_ex(offset(ex, (float)(ext_pwidth / 2), 
-                                    CLIPPER_OFFSET_SCALE, jtSquare, 3), no_thin_zone, true);
+                            ExPolygons anchor = intersection_ex(
+                                to_polygons(offset_ex(ex, (float)(ext_pwidth / 2), CLIPPER_OFFSET_SCALE, jtSquare, 3)), 
+                                no_thin_zone, true);
                             ExPolygons bounds = _clipper_ex(ClipperLib::ctUnion, to_polygons(ex_bigger), to_polygons(anchor), true);
                             for (ExPolygon &bound : bounds) {
                                 if (!intersection_ex(ex_bigger[0], bound).empty()) {