TileMath.h File Reference

#include <QtCore/QDebug>
#include <QtCore/QHashFunctions>
#include <QtCore/QMetaType>
#include <QtCore/QPointF>
#include <QtPositioning/QGeoCoordinate>

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Classes
struct	TileMath::TileKey

Namespaces
namespace	TileMath

Functions
size_t	TileMath::qHash (const TileKey &key, size_t seed=0)
QDebug	TileMath::operator<< (QDebug debug, const TileKey &key)
	Streams as slippy "zoom/x/y" notation for logging.
double	TileMath::worldSize ()
	Full mercator world extent (2*pi*R) in world meters.
bool	TileMath::isValidKey (const TileKey &key)
	True if zoom is within [kMinZoom, kMaxZoom] and x/y address a tile at that zoom.
QPointF	TileMath::geoToWorld (const QGeoCoordinate &coord)
	Geo -> world meters. Latitude is clamped to +/-kMaxLatitude.
QGeoCoordinate	TileMath::worldToGeo (const QPointF &world)
	World meters -> geo (altitude 0)
double	TileMath::mercatorScale (double latitude)
double	TileMath::tileSpanAtZoom (int zoom)
	Edge length of one tile at zoom, in world meters.
QPointF	TileMath::tileMinCorner (const TileKey &key)
	South-west (minimum x/y) corner of a tile in world meters.
TileKey	TileMath::tileForWorld (const QPointF &world, int zoom)
	Tile containing a world point. World coordinates are clamped to the world extent.
double	TileMath::metersPerPixelAtZoom (int zoom)
	World meters spanned by one pixel of a kTilePixels tile at zoom (equator)
int	TileMath::zoomForMetersPerPixel (double metersPerPixel)
	Smallest zoom whose resolution is at least as fine as metersPerPixel (clamped to valid range)

Variables
constexpr double	TileMath::kEarthRadius = 6378137.0
	WGS84 equatorial radius (m)
constexpr double	TileMath::kMaxLatitude = 85.05112878
	Mercator latitude clamp (deg)
constexpr int	TileMath::kMinZoom = 0
constexpr int	TileMath::kMaxZoom = 23
constexpr int	TileMath::kTilePixels = 256
	Nominal tile edge used for meters-per-pixel.