CODEWITHSUNDEEP
iosmapkit
samvermette
samvermette

Reputation: 40437

How do I convert MKZoomScale to a standard [0-20] zoom level?

I'd like to write some drawing rules inside drawMapRect:zoomScale:inContext: based on the standard [0-20] zoom levels that mapping platforms like Google Maps use, but I can't seem to find a formula to convert MKZoomScale to that scale. Any takers?

Upvotes: 2

Views: 663

Answers (1)

MuteQ
MuteQ

Reputation: 76

Try this category on MKMapView

@interface MKMapView (Additions)
- (double)zoomLevel;
@end


@implementation MKMapView (Additions)

- (double)zoomLevel {
    double totalTilesAtMaxZoom = MKMapSizeWorld.width / 256.0;
    NSInteger zoomLevelAtMaxZoom = log2(totalTilesAtMaxZoom);

    return MAX(0, zoomLevelAtMaxZoom + log2f(self.zoomScale));
}

@end

Upvotes: 6

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