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Stabilize choice of which three points to keep with different windings

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This commit is contained in:
Erica Fischer
2023-09-08 11:07:18 -07:00
parent f84a47556c
commit 25265a9cdb
2 changed files with 14 additions and 3 deletions
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tile.cpp
+10 -2
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@@ -2280,6 +2280,7 @@ long long write_tile(decompressor *geoms, std::atomic<long long> *geompos_in, ch
break;
}
}
printf("%zu: ", j - i);
// j - 1 because we don't want the duplicate last point
for (size_t k = i; k < j - 1; k++) {
@@ -2289,6 +2290,8 @@ long long write_tile(decompressor *geoms, std::atomic<long long> *geompos_in, ch
sf.geometry[(k + 2 - i) % (j - 1 - i) + i]);
}
printf("%lld,%lld ", sf.geometry[i].x, sf.geometry[i].y);
// since the starting point is never simplified away,
// don't let it be simplified away in any other polygons either.
// Needs to appear twice here so that the check below will see
@@ -2307,12 +2310,14 @@ long long write_tile(decompressor *geoms, std::atomic<long long> *geompos_in, ch
double xd = sf.geometry[k].x - sf.geometry[i].x;
double yd = sf.geometry[k].y - sf.geometry[i].y;
double d = xd * xd + yd * yd;
if (d > far) {
if (d > far ||
((d == far) && (sf.geometry[k] < sf.geometry[which]))) {
far = d;
which = k;
}
}
printf("%lld,%lld ", sf.geometry[which].x, sf.geometry[which].y);
shared_nodes.push_back(sf.geometry[which]);
shared_nodes.push_back(sf.geometry[which]);
@@ -2330,12 +2335,15 @@ long long write_tile(decompressor *geoms, std::atomic<long long> *geompos_in, ch
double yd2 = sf.geometry[k].y - sf.geometry[which].y;
double d1 = xd * xd + yd * yd;
double d2 = xd2 * xd2 + yd2 * yd2;
if (d1 + d2 > far && d1 != 0 && d2 != 0) {
if (d1 != 0 && d2 != 0 &&
(d1 + d2 > far ||
((d1 + d2 == far) && (sf.geometry[k] < sf.geometry[which2])))) {
far = d1 + d2;
which2 = k;
}
}
printf("%lld,%lld\n", sf.geometry[which2].x, sf.geometry[which2].y);
shared_nodes.push_back(sf.geometry[which2]);
shared_nodes.push_back(sf.geometry[which2]);