Polygon->lines

xs/src/Polygon.hpp

@@ -13,10 +13,24 @@ extern "C" {
 
 namespace Slic3r {
 
-class Polygon : public MultiPoint {};
+class Polygon : public MultiPoint {
+    public:
+    Lines lines();
+};
 
 typedef std::vector<Polygon> Polygons;
 
+Lines
+Polygon::lines()
+{
+    Lines lines;
+    for (int i = 0; i < this->points.size()-1; i++) {
+        lines.push_back(Line(this->points[i], this->points[i+1]));
+    }
+    lines.push_back(Line(this->points.back(), this->points.front()));
+    return lines;
+}
+
 }
 
 #endif

xs/t/06_polygon.t

@@ -4,7 +4,7 @@ use strict;
 use warnings;
 
 use Slic3r::XS;
-use Test::More tests => 3;
+use Test::More tests => 4;
 
 my $square = [  # ccw
     [100, 100],
@@ -19,4 +19,12 @@ is_deeply $polygon->pp, $square, 'polygon roundtrip';
 is ref($polygon->arrayref), 'ARRAY', 'polygon arrayref is unblessed';
 isa_ok $polygon->[0], 'Slic3r::Point', 'polygon point is blessed';
 
+my $lines = $polygon->lines;
+is_deeply [ map $_->pp, @$lines ], [
+    [ [100, 100], [200, 100] ],
+    [ [200, 100], [200, 200] ],
+    [ [200, 200], [100, 200] ],
+    [ [100, 200], [100, 100] ],
+], 'polygon lines';
+
 __END__

xs/xsp/Polygon.xsp

@@ -15,6 +15,7 @@
         %code{% RETVAL = THIS->to_SV_pureperl(); %};
     void scale(double factor);
     void translate(double x, double y);
+    Lines lines();
 %{
 
 Polygon*