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Fix of Can't convert polyline with more than two points to a line (#6933)

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Sometimes Clipper produces a polyline with more than 2 points when
clipping a line with a polygon or a set of polygons. We hope the intermediate
points are collinear with the line, so we may just ignore them.
This commit is contained in:
Vojtech Bubnik
2021-09-13 15:40:56 +02:00
parent cab71073a1
commit 0a51afa3e6
5 changed files with 9 additions and 11 deletions
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4
src/libslic3r/Fill/FillAdaptive.cpp
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@@ -928,7 +928,9 @@ static Polylines connect_lines_using_hooks(Polylines &&lines, const ExPolygon &b
Linef l { { bg::get<0, 0>(seg), bg::get<0, 1>(seg) }, { bg::get<1, 0>(seg), bg::get<1, 1>(seg) } };
assert(line_alg::distance_to_squared(l, Vec2d(pt.cast<double>())) > 1000 * 1000);
#endif // NDEBUG
} else if (pl.line().distance_to_squared(pt) <= 1000 * 1000)
} else if (pl.size() >= 2 &&
//FIXME Hoping that pl is really a line, trimmed by a polygon using ClipperUtils. Sometimes Clipper leaves some additional collinear points on the polyline, let's hope it is all right.
Line{ pl.front(), pl.back() }.distance_to_squared(pt) <= 1000 * 1000)
out = closest.front().second;
}
return out;