Skip to content

Instantly share code, notes, and snippets.

@ryanhanwu

ryanhanwu/mapViewController.m

Last active November 4, 2022 11:43
Show Gist options
  • Star 9 You must be signed in to star a gist
  • Fork 1 You must be signed in to fork a gist
  • Save ryanhanwu/4dbcdbdf384f5a3cca1f to your computer and use it in GitHub Desktop.
Save ryanhanwu/4dbcdbdf384f5a3cca1f to your computer and use it in GitHub Desktop.
Download ZIP
Calculate Google Map length in meters with zoom level in #Objective-C (converted from #JavaScript) #iOS #Swift
Raw
mapViewController.m
- (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];
}
Raw
original.js
var metersPerPixel = Math.cos(lat * Math.PI/180) * 2 * Math.PI * 6378137 / (256 * Math.pow(2, zoom));
@chrischute
Copy link

👍

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment