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Fix more regressions in test suite regarding the workaround for Clipper bug

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This commit is contained in:
Alessandro Ranellucci 2014-05-21 15:45:16 +02:00
parent 8ca352eb62
commit 5e6ff952df
2 changed files with 9 additions and 8 deletions
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7
t/clipper.t
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@ -82,12 +82,7 @@ use Slic3r::Geometry::Clipper qw(intersection_ex union_ex diff_ex diff_pl);
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(@$square_pl), 'no-op diff_pl returns the unmodified input polyline';
is scalar(@{$res->[0]}), scalar(@$square_pl), 'no-op diff_pl returns the unmodified input polyline';
}
__END__

10
xs/src/ClipperUtils.cpp
View File

@ -343,8 +343,13 @@ void _clipper(ClipperLib::ClipType clipType, const Slic3r::Polylines &subject,
/* Clipper will remove a polyline segment if first point coincides with last one.
Until that bug is not fixed upstream, we move one of those points slightly. */
Slic3r::Polylines polylines = subject; // temp copy to avoid dropping the const qualifier
for (Slic3r::Polylines::iterator polyline = polylines.begin(); polyline != polylines.end(); ++polyline)
polyline->points.front().translate(1, 0);
std::vector<bool> translated(subject.size(), false); // keep track of polylines we applied the hack to
for (Slic3r::Polylines::iterator polyline = polylines.begin(); polyline != polylines.end(); ++polyline) {
if (polyline->points.front().coincides_with(polyline->points.back())) {
polyline->points.front().translate(1, 0);
translated[ polyline - polylines.begin() ] = true;
}
}
// perform operation
ClipperLib::PolyTree polytree;
@ -358,6 +363,7 @@ void _clipper(ClipperLib::ClipType clipType, const Slic3r::Polylines &subject,
// compensate for the above hack
for (Slic3r::Polylines::iterator polyline = retval.begin(); polyline != retval.end(); ++polyline) {
for (Slic3r::Polylines::const_iterator subj_polyline = polylines.begin(); subj_polyline != polylines.end(); ++subj_polyline) {
if (!translated[ subj_polyline - polylines.begin() ]) continue;
// if first point of clipped line coincides with first point of subject line, compensate for hack
if (polyline->points.front().coincides_with(subj_polyline->points.front())) {
polyline->points.front().translate(-1, 0);