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Test Clipper's buggy behavior with polylines having coinciding endpoints

visilibity
Alessandro Ranellucci 2014-04-08 15:26:31 +02:00
parent 38f6e3b643
commit 20ca6cea05
1 changed files with 25 additions and 2 deletions
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27
t/clipper.t
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@ -2,7 +2,7 @@ use Test::More;
use strict;
use warnings;
plan tests => 3;
plan tests => 6;
BEGIN {
use FindBin;
@ -11,7 +11,7 @@ BEGIN {
use List::Util qw(sum);
use Slic3r;
use Slic3r::Geometry::Clipper qw(intersection_ex union_ex diff_ex);
use Slic3r::Geometry::Clipper qw(intersection_ex union_ex diff_ex diff_pl);
{
my $square = [ # ccw
@ -68,3 +68,26 @@ use Slic3r::Geometry::Clipper qw(intersection_ex union_ex diff_ex);
'difference of a cw from two ccw is a contour with one hole';
}
#==========================================================
{
my $square = Slic3r::Polygon->new_scale( # ccw
[10, 10],
[20, 10],
[20, 20],
[10, 20],
);
my $square_pl = $square->split_at_first_point;
my $res = diff_pl([$square_pl], []);
is scalar(@$res), 1, 'no-op diff_pl returns the right number of polylines';
isa_ok $res->[0], 'Slic3r::Polyline', 'no-op diff_pl result';
### NOTE: this test will fail when a bug in Clipper is fixed that is currently
### causing loss of one segment when input polyline has coinciding endpoints.
### When the bug is fixed in Clipper, this test should be reverted from isnt() to is()
### and workarounds in Slic3r::Polygon::clip_as_polyline() should be removed.
isnt scalar(@{$res->[0]}), scalar(@$square_pl), 'no-op diff_pl returns the unmodified input polyline';
}
__END__