Google Maps iOS SDK check if path is in visible region

google-maps, google-maps-sdk-ios, ios, objective-c

Solution

The path is made up of coordinates. And the mapview has a visible Region. You can easily check if a coordinate is in a region eithout even going to pixelspace:

- (void)checkPath:(GMSPath*)path {
    GMSVisibleRegion visibleRegion = _googleMap.projection.visibleRegion;
    GMSCoordinateBounds *bounds = [[GMSCoordinateBounds alloc] initWithRegion: visibleRegion];

    for(int i = 0; i < path.count; i++) {
        CLLocationCoordinate2D coordinate=[path coordinateAtIndex:i];
        if([bounds containsCoordinate:coordinate]) {
            NSLog("Visible");
        }
    }
}

Problem

Original source