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Fixed Polygon::centroid()

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Ported Polygon unit tests from Perl to C++.
This commit is contained in:
Vojtech Bubnik 2021-05-07 11:42:01 +02:00
parent 48cc1e6e34
commit 52b3c655ff
4 changed files with 122 additions and 87 deletions
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78
xs/t/06_polygon.t
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@ -3,11 +3,8 @@
use strict;
use warnings;
use List::Util qw(first);
use Slic3r::XS;
use Test::More tests => 21;
use constant PI => 4 * atan2(1, 1);
use Test::More tests => 3;
my $square = [ # ccw
[100, 100],
@ -17,81 +14,8 @@ my $square = [ # ccw
];
my $polygon = Slic3r::Polygon->new(@$square);
my $cw_polygon = $polygon->clone;
$cw_polygon->reverse;
ok $polygon->is_valid, 'is_valid';
is_deeply $polygon->pp, $square, 'polygon roundtrip';
is ref($polygon->arrayref), 'ARRAY', 'polygon arrayref is unblessed';
isa_ok $polygon->[0], 'Slic3r::Point::Ref', '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';
is_deeply $polygon->split_at_first_point->pp, [ @$square[0,1,2,3,0] ], 'split_at_first_point';
is_deeply $polygon->split_at_index(2)->pp, [ @$square[2,3,0,1,2] ], 'split_at_index';
is_deeply $polygon->split_at_vertex(Slic3r::Point->new(@{$square->[2]}))->pp, [ @$square[2,3,0,1,2] ], 'split_at';
is $polygon->area, 100*100, 'area';
ok $polygon->is_counter_clockwise, 'is_counter_clockwise';
ok !$cw_polygon->is_counter_clockwise, 'is_counter_clockwise';
{
my $clone = $polygon->clone;
$clone->reverse;
ok !$clone->is_counter_clockwise, 'is_counter_clockwise';
$clone->make_counter_clockwise;
ok $clone->is_counter_clockwise, 'make_counter_clockwise';
$clone->make_counter_clockwise;
ok $clone->is_counter_clockwise, 'make_counter_clockwise';
}
ok ref($polygon->first_point) eq 'Slic3r::Point', 'first_point';
ok $polygon->contains_point(Slic3r::Point->new(150,150)), 'ccw contains_point';
ok $cw_polygon->contains_point(Slic3r::Point->new(150,150)), 'cw contains_point';
{
my @points = (Slic3r::Point->new(100,0));
foreach my $i (1..5) {
my $point = $points[0]->clone;
$point->rotate(PI/3*$i, [0,0]);
push @points, $point;
}
my $hexagon = Slic3r::Polygon->new(@points);
my $triangles = $hexagon->triangulate_convex;
is scalar(@$triangles), 4, 'right number of triangles';
ok !(defined first { $_->is_clockwise } @$triangles), 'all triangles are ccw';
}
{
is_deeply $polygon->centroid->pp, [150,150], 'centroid';
}
{
my $polygon = Slic3r::Polygon->new(
[50000000, 100000000],
[300000000, 102000000],
[50000000, 104000000],
);
my $line = Slic3r::Line->new([175992032,102000000], [47983964,102000000]);
my $intersection = $polygon->intersection($line);
is_deeply $intersection->pp, [50000000, 102000000], 'polygon-line intersection';
}
# this is not a test: this just demonstrates bad usage, where $polygon->clone gets
# DESTROY'ed before the derived object ($point), causing bad memory access
if (0) {
my $point;
{
$point = $polygon->clone->[0];
}
$point->scale(2);
}
__END__