Lots of changes and refactoring after testing with hollow objects

lib/Slic3r/SVG.pm

@@ -0,0 +1,86 @@
+package Slic3r::SVG;
+use strict;
+use warnings;
+
+use SVG;
+
+use constant X => 0;
+use constant Y => 1;
+
+sub factor {
+    return $Slic3r::resolution * 10;
+}
+
+sub svg {
+    my ($print) = @_;
+    
+    return SVG->new(width => $print->max_length * factor(), height => $print->max_length * factor());
+}
+
+sub output_polygons {
+    my ($print, $filename, $polygons) = @_;
+    
+    my $svg = svg($print);
+    my $g = $svg->group(
+        style => {
+            'stroke-width' => 2,
+        },
+    );
+    foreach my $polygon (@$polygons) {
+        my $path = $svg->get_path(
+            'x' => [ map($_->[X] * factor(), @$polygon) ],
+            'y' => [ map($_->[Y] * factor(), @$polygon) ],
+            -type => 'polygon',
+        );
+        $g->polygon(
+            %$path,
+        );
+    }
+    
+    write_svg($svg, $filename);
+}
+
+sub output_lines {
+    my ($print, $filename, $lines) = @_;
+    
+    my $svg = svg($print);
+    my $g = $svg->group(
+        style => {
+            'stroke-width' => 2,
+        },
+    );
+    
+    my $color = 'red';
+    my $draw_line = sub {
+        my ($line) = @_;
+        $g->line(
+            x1 => $line->[0][X] * factor(),
+            y1 => $line->[0][Y] * factor(),
+            x2 => $line->[1][X] * factor(),
+            y2 => $line->[1][Y] * factor(),
+            style => {
+                'stroke' => $color,
+            },
+        );
+    };
+    
+    my $last = pop @$lines;
+    foreach my $line (@$lines) {
+        $draw_line->($line);
+    }
+    $color = 'black';
+    $draw_line->($last);
+    
+    write_svg($svg, $filename);
+}
+
+sub write_svg {
+    my ($svg, $filename) = @_;
+    
+    open my $fh, '>', $filename;
+    print $fh $svg->xmlify;
+    close $fh;
+    printf "SVG written to %s\n", $filename;
+}
+
+1;