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filter false gap positives. also faster

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This commit is contained in:
Stewart Allen 2021-02-20 23:10:41 -05:00
commit 804620d91e
1 changed files with 7 additions and 1 deletions
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8
src/geo/polygons.js
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@ -555,7 +555,13 @@
let mid = offset(off, dist / 2, {z});
let cmp = offset(off, dist, {z});
let gap = [];
subtract(ref, cmp, gap, null, z);
let aref = ref.map(p => p.areaDeep()).reduce((a,p) => a +p);
let cref = cmp.length ? cmp.map(p => p.areaDeep()).reduce((a,p) => a + p) : 0;
// threshold subtraction to area deltas > 0.1 % to filter out false
// positives where inset/outset are identical floating point error
if (Math.abs(aref - cref) > 1 - (Math.abs(aref / cref) / 1000)) {
subtract(ref, cmp, gap, null, z);
}
layers.push({idx: total-count, off, mid, gap});
ref = off;
}