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#import "MBXContextSnapshotViewController.h"
#import <Mapbox/Mapbox.h>
@interface MBXContextSnapshotViewController () <MGLMapViewDelegate>
@property MGLMapView *mapView;
@property UIButton *button;
@property UIImageView *imageView;
@end
@implementation MBXContextSnapshotViewController
- (void)viewDidLoad {
[super viewDidLoad];
_mapView = [[MGLMapView alloc] initWithFrame:CGRectMake(0, 0, self.view.bounds.size.width, self.view.bounds.size.height / 2) styleURL:[MGLStyle lightStyleURL]];
_mapView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
[_mapView setCenterCoordinate:_mapView.centerCoordinate zoomLevel:1 animated:NO];
[self.view addSubview:_mapView];
_button = [[UIButton alloc] initWithFrame:CGRectMake(_mapView.frame.origin.x + 100, _mapView.frame.origin.y + 45, 170, 30)];
_button.layer.cornerRadius = 15;
_button.backgroundColor = [UIColor blueColor];
[_button setTitle:@"Create snapshot" forState:UIControlStateNormal];
[_button addTarget:self action:@selector(createSnapshot) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:_button];
_imageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, self.view.bounds.size.height / 2, self.view.bounds.size.width, self.view.bounds.size.height / 2)];
_imageView.backgroundColor = [UIColor blackColor];
_imageView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
[self.view addSubview:_imageView];
}
- (void)createSnapshot {
MGLMapSnapshotOptions *options = [[MGLMapSnapshotOptions alloc] initWithStyleURL:_mapView.styleURL camera:_mapView.camera size:_mapView.bounds.size];
options.zoomLevel = _mapView.zoomLevel;
UIActivityIndicatorView *indicator = [[UIActivityIndicatorView alloc] initWithFrame:CGRectMake(_imageView.center.x - 30, _imageView.center.y - 30, 60, 60)];
[self.view addSubview:indicator];
[indicator startAnimating];
CGRect imageRect = _imageView.bounds;
__block MGLMapSnapshotter *snapshotter = [[MGLMapSnapshotter alloc] initWithOptions:options];
[snapshotter startWithOverlayHandler:^(MGLMapSnapshotOverlay * _Nullable snapshotOverlay) {
// Overlays red square over snapshot (but below attribution)
// CGContextSetFillColorWithColor(snapshotOverlay.context, [UIColor.greenColor CGColor]);
// CGContextSetAlpha(snapshotOverlay.context, 0.2);
// CGContextAddRect(snapshotOverlay.context, imageRect);
// CGContextFillRect(snapshotOverlay.context, imageRect);
// Slick drawing, but pushes attribution out of the way
CGContextSetStrokeColorWithColor(snapshotOverlay.context, [UIColor.redColor CGColor]);
CGContextTranslateCTM(snapshotOverlay.context, imageRect.size.width / 2, imageRect.size.height / 2);
BOOL first = YES;
CGFloat length = 256;
for (int i = 1; i <= length; i++)
{
CGContextRotateCTM(snapshotOverlay.context, M_PI / 2);
if (first) {
CGContextMoveToPoint(snapshotOverlay.context, length, 50);
first = NO;
} else {
CGContextAddLineToPoint(snapshotOverlay.context, length, 50);
}
length *= 0.99;
}
CGContextStrokePath(snapshotOverlay.context);
} completionHandler:^(MGLMapSnapshot * _Nullable snapshot, NSError * _Nullable error) {
if (error != nil) {
NSLog(@"Unable to create a map snapshot.");
} else if (snapshot != nil) {
// Add the map snapshot's image to the image view.
[indicator stopAnimating];
self.imageView.image = snapshot.image;
}
snapshotter = nil;
}];
}
@end
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