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Update Clipper to last trunk to fix a couple Clipper bugs causing empty intersection results and failure to process polylines with coinciding endpoints. This also caused crashed in some rare circumstances

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Alessandro Ranellucci
2014-05-23 23:58:43 +02:00
parent a3bd1b5302
commit 70ceb853f1
3 changed files with 205 additions and 379 deletions
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31
xs/src/ClipperUtils.cpp
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@@ -339,43 +339,14 @@ void _clipper(ClipperLib::ClipType clipType, const Slic3r::Polygons &subject,
void _clipper(ClipperLib::ClipType clipType, const Slic3r::Polylines &subject,
const Slic3r::Polygons &clip, Slic3r::Polylines &retval, bool safety_offset_)
{
/* 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
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;
_clipper_do(clipType, polylines, clip, polytree, ClipperLib::pftNonZero, safety_offset_);
_clipper_do(clipType, subject, clip, polytree, ClipperLib::pftNonZero, safety_offset_);
// convert into Polylines
ClipperLib::Paths output;
ClipperLib::PolyTreeToPaths(polytree, output);
ClipperPaths_to_Slic3rMultiPoints(output, retval);
// 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);
break;
}
// since Clipper does not preserve orientation of polylines, check last point too
if (polyline->points.back().coincides_with(subj_polyline->points.front())) {
polyline->points.back().translate(-1, 0);
break;
}
}
}
}
void _clipper(ClipperLib::ClipType clipType, const Slic3r::Polygons &subject,