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Optimization in getEdgeHexagons #913

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merged 2 commits into from
Sep 26, 2024
+6 −5
Merged

Optimization in getEdgeHexagons #913

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bae3394
Optimization in getEdgeHexagons
heshpdx Sep 26, 2024
9a157d8
Updated changelog to add #913
heshpdx Sep 26, 2024
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Optimization in getEdgeHexagons 
Replace 4 fpdiv's with 1 fpdiv and 4 fpmul's
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@heshpdx
heshpdx committed Sep 26, 2024
commit bae3394457a23a0e7a9c0d2b56727f1fd16f1680
9 changes: 5 additions & 4 deletions src/h3lib/lib/algos.c
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Original file line number Diff line number Diff line change
Expand Up @@ -837,12 +837,13 @@ H3Error _getEdgeHexagons(const GeoLoop *geoloop, int64_t numHexagons, int res,
}
for (int64_t j = 0; j < numHexesEstimate; j++) {
LatLng interpolate;
double invNumHexesEst = 1.0 / numHexesEstimate;
interpolate.lat =
(origin.lat * (numHexesEstimate - j) / numHexesEstimate) +
(destination.lat * j / numHexesEstimate);
(origin.lat * (numHexesEstimate - j) * invNumHexesEst) +
(destination.lat * j * invNumHexesEst);
interpolate.lng =
(origin.lng * (numHexesEstimate - j) / numHexesEstimate) +
(destination.lng * j / numHexesEstimate);
(origin.lng * (numHexesEstimate - j) * invNumHexesEst) +
(destination.lng * j * invNumHexesEst);
H3Index pointHex;
H3Error e = H3_EXPORT(latLngToCell)(&interpolate, res, &pointHex);
if (e) {
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