diff options
Diffstat (limited to 'platform/darwin/src/MGLGeometry.mm')
-rw-r--r-- | platform/darwin/src/MGLGeometry.mm | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/platform/darwin/src/MGLGeometry.mm b/platform/darwin/src/MGLGeometry.mm index 43bf74c407..715a70f0b8 100644 --- a/platform/darwin/src/MGLGeometry.mm +++ b/platform/darwin/src/MGLGeometry.mm @@ -62,6 +62,42 @@ double MGLZoomLevelForAltitude(CLLocationDistance altitude, CGFloat pitch, CLLoc return ::log2(mapPixelWidthAtZoom / mbgl::util::tileSize); } +MGLRadianDistance MGLDistanceBetweenRadianCoordinates(MGLRadianCoordinate2D from, MGLRadianCoordinate2D to) { + double a = pow(sin((to.latitude - from.latitude) / 2), 2) + + pow(sin((to.longitude - from.longitude) / 2), 2) * cos(from.latitude) * cos(to.latitude); + + return 2 * atan2(sqrt(a), sqrt(1 - a)); +} + +MGLRadianDirection MGLRadianCoordinatesDirection(MGLRadianCoordinate2D from, MGLRadianCoordinate2D to) { + double a = sin(to.longitude - from.longitude) * cos(to.latitude); + double b = cos(from.latitude) * sin(to.latitude) + - sin(from.latitude) * cos(to.latitude) * cos(to.longitude - from.longitude); + return atan2(a, b); +} + +MGLRadianCoordinate2D MGLRadianCoordinateAtDistanceFacingDirection(MGLRadianCoordinate2D coordinate, + MGLRadianDistance distance, + MGLRadianDirection direction) { + double otherLatitude = asin(sin(coordinate.latitude) * cos(distance) + + cos(coordinate.latitude) * sin(distance) * cos(direction)); + double otherLongitude = coordinate.longitude + atan2(sin(direction) * sin(distance) * cos(coordinate.latitude), + cos(distance) - sin(coordinate.latitude) * sin(otherLatitude)); + return MGLRadianCoordinate2DMake(otherLatitude, otherLongitude); +} + +CLLocationDirection MGLDirectionBetweenCoordinates(CLLocationCoordinate2D firstCoordinate, CLLocationCoordinate2D secondCoordinate) { + // Ported from https://github.com/mapbox/turf-swift/blob/857e2e8060678ef4a7a9169d4971b0788fdffc37/Turf/Turf.swift#L23-L31 + MGLRadianCoordinate2D firstRadianCoordinate = MGLRadianCoordinateFromLocationCoordinate(firstCoordinate); + MGLRadianCoordinate2D secondRadianCoordinate = MGLRadianCoordinateFromLocationCoordinate(secondCoordinate); + + CGFloat a = sin(secondRadianCoordinate.longitude - firstRadianCoordinate.longitude) * cos(secondRadianCoordinate.latitude); + CGFloat b = (cos(firstRadianCoordinate.latitude) * sin(secondRadianCoordinate.latitude) + - sin(firstRadianCoordinate.latitude) * cos(secondRadianCoordinate.latitude) * cos(secondRadianCoordinate.longitude - firstRadianCoordinate.longitude)); + MGLRadianDirection radianDirection = atan2(a, b); + return radianDirection * 180 / M_PI; +} + CGPoint MGLPointRounded(CGPoint point) { #if TARGET_OS_IPHONE || TARGET_OS_SIMULATOR CGFloat scaleFactor = [UIScreen instancesRespondToSelector:@selector(nativeScale)] ? [UIScreen mainScreen].nativeScale : [UIScreen mainScreen].scale; |