Michael Nino Evensen michaelevensen

Designer / developer.

michaelevensen / mapViewController.m

Created February 15, 2017 10:27 — forked from ryanhanwu/mapViewController.m

Calculate Google Map length in meters with zoom level in #Objective-C (converted from #JavaScript) #iOS

	- (void)mapView:(GMSMapView)mapView idleAtCameraPosition:(GMSCameraPosition)position
	{
	CLLocationCoordinate2D topLeft = mapView.projection.visibleRegion.farLeft;
	CLLocationCoordinate2D bottomLeft = mapView.projection.visibleRegion.nearLeft;
	double lat = fabs(topLeft.latitude - bottomLeft.latitude);
	double mpp = cos(lat * M_PI / 180) * 2 * M_PI * 6378137 / (256 * pow(2, mapView.camera.zoom));
	double distance = mpp * mapView.frame.size.width;
	[[SearchManager shareInstance] distance: distance];
	}