Cleanup lines resulting from plane intersection before detecting polygons. This allows for more tolerance with dirty models. Performance impact depends on how many layers are detected as dirty. #16 #28

MANIFEST

@@ -39,6 +39,7 @@ slic3r.pl
 t/arcs.t
 t/clean_polylines.t
 t/clipper.t
+t/collinear.t
 t/geometry.t
 t/polyclip.t
 t/stl.t

lib/Slic3r/Extruder.pm

@@ -31,13 +31,9 @@ has 'retract_speed' => (
     default => sub { $Slic3r::retract_speed * 60 },  # mm/min
 );
 
-use Slic3r::Geometry qw(points_coincide);
+use Slic3r::Geometry qw(points_coincide PI X Y);
 use XXX;
 
-use constant PI => 4 * atan2(1, 1);
-use constant X => 0;
-use constant Y => 1;
-
 sub move_z {
     my $self = shift;
     my ($z) = @_;

lib/Slic3r/ExtrusionPath.pm

@@ -7,10 +7,7 @@ extends 'Slic3r::Polyline';
 # expressed in layers
 has 'depth_layers' => (is => 'ro', default => sub {1});
 
-use constant X => 0;
+use Slic3r::Geometry qw(PI X Y epsilon deg2rad rotate_points);
-use constant Y => 1;
-
-use Slic3r::Geometry qw(PI epsilon deg2rad rotate_points);
 use XXX;
 
 sub clip_end {

lib/Slic3r/Geometry.pm

@@ -5,7 +5,7 @@ use warnings;
 require Exporter;
 our @ISA = qw(Exporter);
 our @EXPORT_OK = qw(
-    PI epsilon slope line_atan lines_parallel three_points_aligned
+    PI X Y Z A B epsilon slope line_atan lines_parallel three_points_aligned
     line_point_belongs_to_segment points_coincide distance_between_points 
     line_length midpoint point_in_polygon point_in_segment segment_in_segment
     point_is_on_left_of_segment polyline_lines polygon_lines nearest_point
@@ -17,7 +17,7 @@ our @EXPORT_OK = qw(
     clip_segment_complex_polygon longest_segment angle3points
     polyline_remove_parallel_continuous_edges polyline_remove_acute_vertices
     polygon_remove_acute_vertices polygon_remove_parallel_continuous_edges
-    shortest_path
+    shortest_path collinear
 );
 
 use Slic3r::Geometry::DouglasPeucker qw(Douglas_Peucker);
@@ -28,6 +28,7 @@ use constant A => 0;
 use constant B => 1;
 use constant X => 0;
 use constant Y => 1;
+use constant Z => 2;
 our $parallel_degrees_limit = abs(deg2rad(3));
 
 our $epsilon = 1E-4;
@@ -416,6 +417,22 @@ sub line_intersection {
         : undef;
 }
 
+sub collinear {
+    my ($line1, $line2, $require_overlapping) = @_;
+    my $intersection = _line_intersection(map @$_, @$line1, @$line2);
+    return 0 unless !ref($intersection) 
+        && ($intersection eq 'parallel collinear'
+            || ($intersection eq 'parallel vertical' && abs($line1->[A][X] - $line2->[A][X]) < epsilon));
+    
+    if ($require_overlapping) {
+        my @box_a = bounding_box([ $line1->[0], $line1->[1] ]);
+        my @box_b = bounding_box([ $line2->[0], $line2->[1] ]);
+        return 0 unless bounding_box_intersect( 2, @box_a, @box_b );
+    }
+    
+    return 1;
+}
+
 sub _line_intersection {
   my ( $x0, $y0, $x1, $y1, $x2, $y2, $x3, $y3 );
 

lib/Slic3r/Layer.pm

@@ -3,14 +3,10 @@ use Moo;
 
 use Math::Clipper ':all';
 use Slic3r::Geometry qw(polygon_lines points_coincide angle3points polyline_lines nearest_point
-    line_length);
+    line_length collinear X Y A B PI);
-use Slic3r::Geometry::Clipper qw(safety_offset union_ex PFT_EVENODD);
+use Slic3r::Geometry::Clipper qw(safety_offset union_ex);
 use XXX;
 
-use constant PI => 4 * atan2(1, 1);
-use constant A => 0;
-use constant B => 1;
-
 # a sequential number of layer, starting at 0
 has 'id' => (
     is          => 'ro',
@@ -116,32 +112,58 @@ sub add_line {
     return $line;
 }
 
-sub remove_line {
+# merge overlapping lines
+sub cleanup_lines {
     my $self = shift;
-    my ($line) = @_;
-    @{ $self->lines } = grep $_ ne $line, @{ $self->lines };
-}
     
-sub remove_surface {
+    my $lines = $self->lines;
-    my $self = shift;
+    my $line_count = @$lines;
-    my ($surface) = @_;
+    
-    @{ $self->surfaces } = grep $_ ne $surface, @{ $self->surfaces };
+    for (my $i = 0; $i <= $#$lines-1; $i++) {
+        for (my $j = $i+1; $j <= $#$lines; $j++) {
+            # lines are collinear and overlapping?
+            next unless collinear($lines->[$i], $lines->[$j], 1);
+            
+            # lines have same orientation?
+            next unless ($lines->[$i][A][X] <=> $lines->[$i][B][X]) == ($lines->[$j][A][X] <=> $lines->[$j][B][X])
+                && ($lines->[$i][A][Y] <=> $lines->[$i][B][Y]) == ($lines->[$j][A][Y] <=> $lines->[$j][B][Y]);
+            
+            # resulting line
+            my @x = sort { $a <=> $b } ($lines->[$i][A][X], $lines->[$i][B][X], $lines->[$j][A][X], $lines->[$j][B][X]);
+            my @y = sort { $a <=> $b } ($lines->[$i][A][Y], $lines->[$i][B][Y], $lines->[$j][A][Y], $lines->[$j][B][Y]);
+            my $new_line = Slic3r::Line->new([$x[0], $y[0]], [$x[-1], $y[-1]]);
+            for (X, Y) {
+                ($new_line->[A][$_], $new_line->[B][$_]) = ($new_line->[B][$_], $new_line->[A][$_])
+                    if $lines->[$i][A][$_] > $lines->[$i][B][$_];
+            }
+            
+            # save new line and remove found one
+            $lines->[$i] = $new_line;
+            splice @$lines, $j, 1;
+            $j--;
+        }
+    }
+    
+    Slic3r::debugf "  merging %d lines resulted in %d lines\n", $line_count, scalar(@$lines);
 }
 
 # build polylines from lines
 sub make_surfaces {
     my $self = shift;
     
-    my @lines = ();
+    if (0) {
-    push @lines, @{$self->lines};
+        require "Slic3r/SVG.pm";
-    #@lines = grep line_length($_) > xx, @lines;
+        Slic3r::SVG::output(undef, "lines.svg",
+            lines       => [ grep !$_->isa('Slic3r::Line::FacetEdge'), @{$self->lines} ],
+            red_lines   => [ grep  $_->isa('Slic3r::Line::FacetEdge'), @{$self->lines} ],
+        );
+    }
     
-    #use Slic3r::SVG;
+    my (@polygons, %visited_lines, @discarded_lines, @discarded_polylines) = ();
-    #Slic3r::SVG::output(undef, "lines.svg",
-    #    lines       => [ map $_->p, grep !$_->isa('Slic3r::Line::FacetEdge'), @{$self->lines} ],
-    #    red_lines   => [ map $_->p, grep  $_->isa('Slic3r::Line::FacetEdge'), @{$self->lines} ],
-    #);
     
+    my $detect = sub {
+        my @lines = @{$self->lines};
+        (@polygons, %visited_lines, @discarded_lines, @discarded_polylines) = ();
         my $get_point_id = sub { sprintf "%.0f,%.0f", @{$_[0]} };
         
         my (%pointmap, @pointmap_keys) = ();
@@ -155,7 +177,6 @@ sub make_surfaces {
         }
         
         my $n = 0;
-    my (@polygons, %visited_lines, @discarded_lines, @discarded_polylines) = ();
         while (my $first_line = shift @lines) {
             next if $visited_lines{ $first_line->id };
             my @points = @$first_line;
@@ -218,9 +239,8 @@ sub make_surfaces {
             
             if (@points < 4 || !points_coincide($points[0], $points[-1])) {
                 # discarding polyline
-            if (@points == 2) {
+                push @discarded_lines, @seen_lines;
-                push @discarded_lines, [@points];
+                if (@points > 2) {
-            } else {
                     push @discarded_polylines, [@points];
                 }
                 next;
@@ -232,6 +252,9 @@ sub make_surfaces {
             push @polygons, Slic3r::Polygon->new(@points);
             $polygons[-1]->cleanup;
         }
+    };
+    
+    $detect->();
     
     # Now, if we got a clean and manifold model then @polygons would contain everything
     # we need to draw our layer. In real life, sadly, things are different and it is likely
@@ -243,10 +266,11 @@ sub make_surfaces {
     # other line.
     
     # So, let's first check what lines were not detected as part of polygons.
-    if (@discarded_lines || @discarded_polylines) {
+    if (@discarded_lines) {
-        print "  Warning: errors while parsing this layer (dirty or non-manifold model)\n";
         Slic3r::debugf "  %d lines out of %d were discarded and %d polylines were not closed\n",
             scalar(@discarded_lines), scalar(@{$self->lines}), scalar(@discarded_polylines);
+        print "  Warning: errors while parsing this layer (dirty or non-manifold model).\n";
+        print "  Retrying with slower algorithm.\n";
         
         if (0) {
             require "Slic3r/SVG.pm";
@@ -261,10 +285,17 @@ sub make_surfaces {
             );
             exit;
         }
+        
+        $self->cleanup_lines;
+        $detect->();
+        
+        if (@discarded_lines) {
+            print "  Warning: even slow detection algorithm throwed errors. Review the output before printing.\n";
+        }
     }
     
     {
-        my $expolygons = union_ex([ @polygons ], PFT_EVENODD);
+        my $expolygons = union_ex([ @polygons ]);
         Slic3r::debugf "  %d surface(s) having %d holes detected from %d polylines\n",
             scalar(@$expolygons), scalar(map $_->holes, @$expolygons), scalar(@polygons);
         

lib/Slic3r/Line.pm

@@ -2,10 +2,7 @@ package Slic3r::Line;
 use strict;
 use warnings;
 
-use constant A => 0;
+use Slic3r::Geometry qw(A B X Y);
-use constant B => 1;
-use constant X => 0;
-use constant Y => 1;
 
 sub new {
     my $class = shift;
@@ -100,4 +97,9 @@ sub midpoint {
     );
 }
 
+sub reverse {
+    my $self = shift;
+    @$self = reverse @$self;
+}
+
 1;

lib/Slic3r/Perimeter.pm

@@ -3,12 +3,9 @@ use Moo;
 
 use Math::Clipper ':all';
 use Math::ConvexHull 1.0.4 qw(convex_hull);
-use Slic3r::Geometry qw(shortest_path);
+use Slic3r::Geometry qw(X Y shortest_path);
 use XXX;
 
-use constant X => 0;
-use constant Y => 1;
-
 sub make_perimeter {
     my $self = shift;
     my ($layer) = @_;

lib/Slic3r/Print.pm

@@ -2,12 +2,10 @@ package Slic3r::Print;
 use Moo;
 
 use Math::Clipper ':all';
+use Slic3r::Geometry qw(X Y);
 use Slic3r::Geometry::Clipper qw(explode_expolygons safety_offset diff_ex intersection_ex);
 use XXX;
 
-use constant X => 0;
-use constant Y => 1;
-
 has 'x_length' => (
     is          => 'ro',
     required    => 1,

lib/Slic3r/STL.pm

@@ -2,12 +2,9 @@ package Slic3r::STL;
 use Moo;
 
 use Math::Clipper qw(integerize_coordinate_sets is_counter_clockwise);
-use Slic3r::Geometry qw(three_points_aligned longest_segment);
+use Slic3r::Geometry qw(X Y Z three_points_aligned longest_segment);
 use XXX;
 
-use constant X => 0;
-use constant Y => 1;
-use constant Z => 2;
 use constant MIN => 0;
 use constant MAX => 1;
 

t/collinear.t

@@ -0,0 +1,91 @@
+use Test::More;
+use strict;
+use warnings;
+
+plan tests => 11;
+
+BEGIN {
+    use FindBin;
+    use lib "$FindBin::Bin/../lib";
+}
+
+use Slic3r;
+use Slic3r::Geometry qw(collinear);
+
+#==========================================================
+
+{
+    my @lines = (
+        [ [0,4], [4,2] ],
+        [ [2,3], [8,0] ],
+        [ [6,1], [8,0] ],
+    );
+    is collinear($lines[0], $lines[1]), 1, 'collinear';
+    is collinear($lines[1], $lines[2]), 1, 'collinear';
+    is collinear($lines[0], $lines[2]), 1, 'collinear';
+}
+
+#==========================================================
+
+{
+    # horizontal
+    my @lines = (
+        [ [0,1], [5,1] ],
+        [ [2,1], [8,1] ],
+    );
+    is collinear($lines[0], $lines[1]), 1, 'collinear';
+}
+
+#==========================================================
+
+{
+    # vertical
+    my @lines = (
+        [ [1,0], [1,5] ],
+        [ [1,2], [1,8] ],
+    );
+    is collinear($lines[0], $lines[1]), 1, 'collinear';
+}
+
+#==========================================================
+
+{
+    # non overlapping
+    my @lines = (
+        [ [0,1], [5,1] ],
+        [ [7,1], [10,1] ],
+    );
+    is collinear($lines[0], $lines[1], 1), 0, 'non overlapping';
+    is collinear($lines[0], $lines[1], 0), 1, 'overlapping';
+}
+
+#==========================================================
+
+{
+    # with one common point
+    my @lines = (
+        [ [0,4], [4,2] ],
+        [ [4,2], [8,0] ],
+    );
+    is collinear($lines[0], $lines[1], 1), 1, 'one common point';
+    is collinear($lines[0], $lines[1], 0), 1, 'one common point';
+}
+
+#==========================================================
+
+{
+    # not collinear
+    my @lines = (
+        [ [290000000,690525600], [285163380,684761540] ],
+        [ [285163380,684761540], [193267599,575244400] ],
+    );
+    is collinear($lines[0], $lines[1], 0), 0, 'not collinear';
+    is collinear($lines[0], $lines[1], 1), 0, 'not collinear';
+    
+    use Slic3r::SVG;
+    Slic3r::SVG::output(undef, "collinear.svg",
+        lines => \@lines,
+    );
+}
+
+#==========================================================