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Fix function _is_point_in_polygon() #19924

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Fix function _is_point_in_polygon() #19924

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e0f87da
Fix function _is_point_in_polygon()
codecrusher64 Dec 15, 2025
7f70077
Improve accuracy of function _is_point_in_polygon()
codecrusher64 Dec 15, 2025
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7 changes: 3 additions & 4 deletions src/common/map_locations.c
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Original file line number Diff line number Diff line change
Expand Up @@ -263,11 +263,10 @@ static gboolean _is_point_in_polygon(const dt_geo_map_display_point_t *pt,
lat2 = plp->lat;
lon2 = plp->lon;
}
if(!(((lat1 > pt->lat) && (lat2 > pt->lat)) ||
((lat1 < pt->lat) && (lat2 < pt->lat))))
if((lat1 > pt->lat) != (lat2 > pt->lat))
{
const float sl = lon1 + (lon2 - lon1) * (pt->lat - lat1) / (lat2 - lat1);
if(pt->lon > sl)
const float sl = (lat2 - lat1) * (pt->lon - lon1) - (lon2 - lon1) * (pt->lat - lat1);
if((sl > 0) != (lat2 < lat1))
inside = !inside;
}
lat1 = lat2;
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