void Slic3rMultiPoint_to_ClipperPath(const Slic3r::MultiPoint &input, ClipperLib::Path &output) { output.clear(); for (Slic3r::Points::const_iterator pit = input.points.begin(); pit != input.points.end(); ++pit) { output.push_back(ClipperLib::IntPoint( (*pit).x, (*pit).y )); } }
geo::Polygon<geo::Ring<Vector>> Environment::subtract(geo::Polygon<geo::Ring<Vector>> const& poly, geo::Ring<Vector> const& ring) { ClipperLib::Path subj; ClipperLib::Paths solution; ClipperLib::Clipper c; for (Vector const& v : poly.ering) subj.push_back(ClipperLib::IntPoint((int)v.x, (int)v.y)); c.AddPath(subj, ClipperLib::ptSubject, true); for (Ring const& ring : poly.irings) { subj.clear(); for (Vector const& v : ring) subj.push_back(ClipperLib::IntPoint((int)v.x, (int)v.y)); std::reverse(subj.begin(), subj.end()); c.AddPath(subj, ClipperLib::ptSubject, true); } subj.clear(); for (Vector const& v : ring) subj.push_back(ClipperLib::IntPoint((int)v.x, (int)v.y)); c.AddPath(subj, ClipperLib::ptClip, true); c.Execute(ClipperLib::ctDifference, solution); geo::Polygon<geo::Ring<Vector>> ans; for (ClipperLib::IntPoint const& pt : solution[0]) { ans.ering.push_back({pt.X, pt.Y}); } for (int i = 1; i < solution.size(); ++i) { ClipperLib::Path const& path = solution[i]; geo::Ring<Vector> ring; for (ClipperLib::IntPoint const& pt : path) ring.push_back({pt.X, pt.Y}); ans.irings.push_back(ring); } geo::correct(ans); return ans; }