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u10int/gist:4178336

Created November 30, 2012 20:23
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@implementation MKMapView (ZoomLevel)
- (NSUInteger) zoomLevel {
return (21 - round(log2(self.region.span.longitudeDelta * MERCATOR_RADIUS * M_PI / (180.0 * self.bounds.size.width))));
}
@end
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