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Don't let concave/complex polygons decay into dust

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Erica Fischer
2023-10-27 15:08:17 -07:00
parent 5afc80d778
commit 705da717b2
1 changed files with 16 additions and 0 deletions
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geometry.cpp
+16
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@@ -197,6 +197,22 @@ drawvec reduce_tiny_poly(drawvec &geom, int z, int detail, bool *still_needs_sim
double area = get_area(geom, i, j); double area = get_area(geom, i, j);
long long minx = LLONG_MAX;
long long maxx = LLONG_MIN;
long long miny = LLONG_MAX;
long long maxy = LLONG_MIN;
for (auto const &d : geom) {
minx = std::min(minx, (long long) d.x);
maxx = std::max(maxx, (long long) d.x);
miny = std::min(miny, (long long) d.y);
maxy = std::max(maxy, (long long) d.y);
}
if (area > 0 && area < minx * maxx / 4) {
// if the polygon doesn't use most of its area,
// don't let it be dust.
area = pixel * pixel * 2;
}
// XXX There is an ambiguity here: If the area of a ring is 0 and it is followed by holes, // XXX There is an ambiguity here: If the area of a ring is 0 and it is followed by holes,
// we don't know whether the area-0 ring was a hole too or whether it was the outer ring // we don't know whether the area-0 ring was a hole too or whether it was the outer ring
// that these subsequent holes are somehow being subtracted from. I hope that if a polygon // that these subsequent holes are somehow being subtracted from. I hope that if a polygon