/**

    Copyright (C) 2016 Apple Inc. All Rights Reserved.

    See LICENSE.txt for this sample’s licensing information

    Abstract:

    This class provides an MKOverlay that can be used to hide MapKit's underlaying map tiles.

*/

#import "AAPLHideBackgroundOverlay.h"

@implementation AAPLHideBackgroundOverlay

+ (instancetype)hideBackgroundOverlay {

    MKMapPoint corners[4];

    corners[0] = MKMapPointMake(MKMapRectGetMaxX(MKMapRectWorld), MKMapRectGetMaxY(MKMapRectWorld));

    corners[1] = MKMapPointMake(MKMapRectGetMinX(MKMapRectWorld), MKMapRectGetMaxY(MKMapRectWorld));

    corners[2] = MKMapPointMake(MKMapRectGetMinX(MKMapRectWorld), MKMapRectGetMinY(MKMapRectWorld));

    corners[3] = MKMapPointMake(MKMapRectGetMaxX(MKMapRectWorld), MKMapRectGetMinY(MKMapRectWorld));

    return [AAPLHideBackgroundOverlay polygonWithPoints:corners count:4];

}

/**

    @return YES to tell MapKit to hide its underlying map tiles, as long as

        this overlay is visible (which, as you can see above, is everywhere in

        the world), effectively hiding all map tiles and replacing them with a

        solid colored \c MKPolygon.

 */

- (BOOL)canReplaceMapContent {

    return YES;

}

@end