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Fix longitude wraparound in overzoom bins

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This commit is contained in:
Erica Fischer
2024-08-28 14:23:10 -07:00
parent 29934401a1
commit 7b3f0246a6
4 changed files with 230 additions and 3 deletions
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read_json.cpp
+17 -3
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@@ -282,11 +282,25 @@ std::vector<mvt_layer> parse_layers(FILE *fp, int z, unsigned x, unsigned y, int
dv = fix_polygon(dv, false, false);
}
// Scale and offset geometry from global to tile
// Offset and scale geometry from global to tile
for (size_t i = 0; i < dv.size(); i++) {
long long scale = 1LL << (32 - z);
dv[i].x = std::round((dv[i].x - scale * x) * extent / (double) scale);
dv[i].y = std::round((dv[i].y - scale * y) * extent / (double) scale);
// offset
dv[i].x -= scale * x;
dv[i].y -= scale * y;
// handle longitude wraparound
if (dv[i].x > 2 * scale && dv[i].x - (1LL << 32) > -3 * scale) {
dv[i].x -= 1LL << 32;
}
if (dv[i].x < -3 * scale && dv[i].x + (1LL << 32) < 2 * scale) {
dv[i].x += 1LL << 32;
}
// scale
dv[i].x = std::round(dv[i].x * extent / (double) scale);
dv[i].y = std::round(dv[i].y * extent / (double) scale);
}
if (mb_geometry[t] == VT_POLYGON) {