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Maps: Add LatLngBounds struct

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Bastiaan van der Plaat 2023-09-15 19:50:58 +02:00 • committed by Andrew Kaster
parent baf2121636
commit 2bdd39f198
2 changed files with 18 additions and 2 deletions
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12
Userland/Applications/Maps/MapWidget.cpp
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@ -47,8 +47,16 @@ static double nice_round_number(double number)
double MapWidget::LatLng::distance_to(LatLng const& other) const double MapWidget::LatLng::distance_to(LatLng const& other) const
{ {
double const earth_radius = 6371000.0; return EARTH_RADIUS * 2.0 * asin(sqrt(pow(sin((AK::to_radians(other.latitude) - AK::to_radians(latitude)) / 2.0), 2.0) + cos(AK::to_radians(latitude)) * cos(AK::to_radians(other.latitude)) * pow(sin((AK::to_radians(other.longitude) - AK::to_radians(longitude)) / 2.0), 2.0)));
return earth_radius * 2.0 * asin(sqrt(pow(sin((AK::to_radians(other.latitude) - AK::to_radians(latitude)) / 2.0), 2.0) + cos(AK::to_radians(latitude)) * cos(AK::to_radians(other.latitude)) * pow(sin((AK::to_radians(other.longitude) - AK::to_radians(longitude)) / 2.0), 2.0))); }
int MapWidget::LatLngBounds::get_zoom() const
{
double distance_meters = north_west.distance_to(south_east);
int zoom = ZOOM_MIN;
while (distance_meters < EARTH_RADIUS / pow(2, zoom - 1) && zoom != ZOOM_MAX)
++zoom;
return min(zoom + 1, ZOOM_MAX);
} }
// MapWidget class // MapWidget class

8
Userland/Applications/Maps/MapWidget.h
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@ -27,6 +27,13 @@ public:
double distance_to(LatLng const& other) const; double distance_to(LatLng const& other) const;
}; };
struct LatLngBounds {
LatLng north_west;
LatLng south_east;
int get_zoom() const;
};
struct Options { struct Options {
Optional<String> tile_provider {}; Optional<String> tile_provider {};
LatLng center; LatLng center;
@ -141,6 +148,7 @@ private:
static int constexpr TILE_SIZE = 256; static int constexpr TILE_SIZE = 256;
static double constexpr LATITUDE_MAX = 85.0511287798066; static double constexpr LATITUDE_MAX = 85.0511287798066;
static int constexpr EARTH_RADIUS = 6371000.0;
static size_t constexpr TILES_CACHE_MAX = 256; static size_t constexpr TILES_CACHE_MAX = 256;
static constexpr size_t TILES_DOWNLOAD_PARALLEL_MAX = 8; static constexpr size_t TILES_DOWNLOAD_PARALLEL_MAX = 8;
static int constexpr ZOOM_MIN = 2; static int constexpr ZOOM_MIN = 2;