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diff --git a/platform/ios/test/MGLMapViewZoomTests.mm b/platform/ios/test/MGLMapViewZoomTests.mm
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+#import <Mapbox/Mapbox.h>
+#import <XCTest/XCTest.h>
+#import "MGLMockGestureRecognizers.h"
+
+#import <mbgl/math/wrap.hpp>
+
+@interface MGLMapView (MGLMapViewZoomTests)
+@property (nonatomic) BOOL isZooming;
+@property (nonatomic) CGFloat rotationThresholdWhileZooming;
+- (void)handlePinchGesture:(UIPinchGestureRecognizer *)pinch;
+- (void)handleRotateGesture:(UIRotationGestureRecognizer *)rotate;
+@end
+
+@interface MGLMapViewZoomTests : XCTestCase
+@property (nonatomic) MGLMapView *mapView;
+@end
+
+@implementation MGLMapViewZoomTests
+
+- (void)setUp {
+ [super setUp];
+
+ [MGLAccountManager setAccessToken:@"pk.feedcafedeadbeefbadebede"];
+ NSURL *styleURL = [[NSBundle bundleForClass:[self class]] URLForResource:@"one-liner" withExtension:@"json"];
+ self.mapView = [[MGLMapView alloc] initWithFrame:UIScreen.mainScreen.bounds styleURL:styleURL];
+}
+
+- (void)tearDown {
+ self.mapView = nil;
+ [MGLAccountManager setAccessToken:nil];
+ [super tearDown];
+}
+
+- (void)testZoom {
+ CLLocationCoordinate2D originalCenterCoordinate = self.mapView.centerCoordinate;
+
+ for (NSNumber *zoom in @[@1, @5, @10, @15, @22]) {
+ self.mapView.zoomLevel = [zoom doubleValue];
+ XCTAssertEqual(self.mapView.zoomLevel, [zoom doubleValue], @"Map zoom should match z%@.", zoom);
+
+ XCTAssertEqualWithAccuracy(originalCenterCoordinate.latitude, self.mapView.centerCoordinate.latitude, 0.0000001, "@Map center coordinate latitude should remain constant during zoom to z%@.", zoom);
+ XCTAssertEqualWithAccuracy(originalCenterCoordinate.longitude, self.mapView.centerCoordinate.longitude, 0.0000001, @"Map center coordinate longitude should remain constant during zoom to z%@.", zoom);
+ }
+}
+
+- (void)testZoomEnabled {
+ UIPinchGestureRecognizerMock *gesture = [[UIPinchGestureRecognizerMock alloc] initWithTarget:nil action:nil];
+ gesture.state = UIGestureRecognizerStateBegan;
+ gesture.scale = 10.f;
+ [self.mapView handlePinchGesture:gesture];
+ gesture.state = UIGestureRecognizerStateChanged;
+
+ // Disabled
+ {
+ self.mapView.zoomEnabled = NO;
+ XCTAssertEqual(self.mapView.allowsZooming, NO);
+
+ [self.mapView handlePinchGesture:gesture];
+ XCTAssertNotEqual(self.mapView.zoomLevel, log2(gesture.scale), @"Gestural zoom should not work when zoom is disabled.");
+
+ self.mapView.zoomLevel = 15.f;
+ XCTAssertEqualWithAccuracy(self.mapView.zoomLevel, 15, 0.001, @"Programmatic zoom is allowed when zoomEnabled = NO.");
+ }
+
+ // Enabled
+ {
+ // No need to reset the map zoom or gesture scale, since gesture scale hasn't been applied yet and the map zoom will be overriden when the gesture is handled.
+ self.mapView.zoomEnabled = YES;
+ XCTAssertEqual(self.mapView.allowsZooming, YES);
+
+ [self.mapView handlePinchGesture:gesture];
+ XCTAssertEqualWithAccuracy(self.mapView.zoomLevel, log2(gesture.scale), 0.001, @"Gestural zoom should work when zoom is enabled.");
+ }
+}
+
+- (void)testPinchGesture {
+ CLLocationCoordinate2D originalCenterCoordinate = self.mapView.centerCoordinate;
+
+ UIPinchGestureRecognizerMock *gesture = [[UIPinchGestureRecognizerMock alloc] initWithTarget:self.mapView action:nil];
+ gesture.state = UIGestureRecognizerStateBegan;
+ gesture.scale = 0;
+ gesture.locationInViewOverride = self.mapView.center;
+ [self.mapView handlePinchGesture:gesture];
+ XCTAssertEqual(self.mapView.zoomLevel, 0);
+
+ for (NSNumber *zoom in @[@1, @5, @10, @15, @22]) {
+ gesture.state = UIGestureRecognizerStateChanged;
+ gesture.scale = MGLScaleFromZoomLevel([zoom doubleValue]);
+ [self.mapView handlePinchGesture:gesture];
+ XCTAssertEqual(self.mapView.zoomLevel, [zoom doubleValue], @"Map zoom should match gesture to z%@.", zoom);
+
+ // Given a hypothetical zoom into the exact center of the map, the center coordinate should remain the same.
+ XCTAssertEqualWithAccuracy(originalCenterCoordinate.latitude, self.mapView.centerCoordinate.latitude, 0.0000001, "@Map center coordinate latitude should remain constant during zoom to z%@.", zoom);
+ XCTAssertEqualWithAccuracy(originalCenterCoordinate.longitude, self.mapView.centerCoordinate.longitude, 0.0000001, @"Map center coordinate longitude should remain constant during zoom to z%@.", zoom);
+ }
+}
+
+// Regression test for: https://github.com/mapbox/mapbox-gl-native/issues/14977
+- (void)testPinchGestureOffCenter {
+ self.mapView.zoomLevel = 15;
+
+ // Set up pinch gesture at z15 with an origin of 0,0.
+ UIPinchGestureRecognizerMock *gesture = [[UIPinchGestureRecognizerMock alloc] initWithTarget:self.mapView action:nil];
+ gesture.state = UIGestureRecognizerStateBegan;
+ gesture.scale = 0;
+ gesture.locationInViewOverride = CGPointMake(0, 0);
+ [self.mapView handlePinchGesture:gesture];
+ XCTAssertEqual(self.mapView.zoomLevel, 15);
+
+ // Set a map rotation so that we can later check if un-rotating happens around the correct center point.
+ self.mapView.direction = 45;
+
+ // Zoom to z18 at the off-center origin.
+ gesture.state = UIGestureRecognizerStateChanged;
+ gesture.scale = MGLScaleFromZoomLevel(3);
+ [self.mapView handlePinchGesture:gesture];
+ XCTAssertEqual(self.mapView.zoomLevel, 18, @"Map zoom should match original zoom plus gesture zoom.");
+
+ // Check that the center coordinate remains the same when direction is reset to north.
+ CLLocationCoordinate2D centerCoordinateBeforeReset = self.mapView.centerCoordinate;
+ CLLocationCoordinate2D manuallyDerivedCenterCoordinate = [self.mapView convertPoint:self.mapView.center toCoordinateFromView:nil];
+ XCTAssertEqualWithAccuracy(centerCoordinateBeforeReset.latitude, manuallyDerivedCenterCoordinate.latitude, 0.0000001, "@Map center latitude should be equal to manually derived latitude.");
+ XCTAssertEqualWithAccuracy(centerCoordinateBeforeReset.longitude, manuallyDerivedCenterCoordinate.longitude, 0.0000001, @"Map center longitude should be equal to manually derived longitude.");
+
+ self.mapView.direction = 0;
+ XCTAssertEqualWithAccuracy(centerCoordinateBeforeReset.latitude, self.mapView.centerCoordinate.latitude, 0.0000001, "@Map center coordinate latitude should remain constant after resetting to north.");
+ XCTAssertEqualWithAccuracy(centerCoordinateBeforeReset.longitude, self.mapView.centerCoordinate.longitude, 0.0000001, @"Map center coordinate longitude should remain constant after resetting to north.");
+}
+
+- (void)testPinchAndZoom {
+
+ [[NSUserDefaults standardUserDefaults] setObject:@3 forKey:@"MGLRotationThresholdWhileZooming"];
+ self.mapView.rotationThresholdWhileZooming = 3;
+ self.mapView.zoomLevel = 15;
+ UIPinchGestureRecognizerMock *pinch = [[UIPinchGestureRecognizerMock alloc] initWithTarget:self.mapView action:nil];
+ [self.mapView addGestureRecognizer:pinch];
+ pinch.state = UIGestureRecognizerStateBegan;
+ pinch.velocity = 5.0;
+ pinch.locationInViewOverride = CGPointMake(0, 0);
+ [self.mapView handlePinchGesture:pinch];
+
+ XCTAssertTrue(self.mapView.isZooming);
+
+ UIRotationGestureRecognizerMock *rotate = [[UIRotationGestureRecognizerMock alloc] initWithTarget:self.mapView action:nil];
+ rotate.state = UIGestureRecognizerStateBegan;
+ rotate.rotation = MGLRadiansFromDegrees(1);
+ [self.mapView addGestureRecognizer:rotate];
+ [self.mapView handleRotateGesture:rotate];
+
+ // Both the rotation and direction should be zero since the rotation threshold hasn't been met.
+ XCTAssertEqual(rotate.rotation, 0);
+ XCTAssertEqual(self.mapView.direction, 0);
+
+ // The direction should be `0`. The default rotation threshold is `3`.
+ XCTAssertEqual(self.mapView.direction, 0);
+ rotate.state = UIGestureRecognizerStateChanged;
+ rotate.rotation = MGLRadiansFromDegrees(2);
+ [self.mapView handleRotateGesture:rotate];
+
+ // The direction should be `0`. The default rotation threshold is `3`.
+ XCTAssertEqual(self.mapView.direction, 0);
+
+ for (NSNumber *degrees in @[@-90, @-10, @10, @10, @30, @90, @180, @240, @460, @500, @590, @800]) {
+ rotate.state = UIGestureRecognizerStateChanged;
+ rotate.rotation = MGLRadiansFromDegrees([degrees doubleValue]);
+ [self.mapView handleRotateGesture:rotate];
+
+ CGFloat wrappedRotation = mbgl::util::wrap(-MGLDegreesFromRadians(rotate.rotation), 0., 360.);
+
+
+ // Check that the direction property now matches the gesture's rotation.
+ XCTAssertEqualWithAccuracy(self.mapView.direction, wrappedRotation, 0.001, @"Map direction should match gesture rotation for input of %@°.", degrees);
+ }
+
+ rotate.state = UIGestureRecognizerStateEnded;
+ pinch.state = UIGestureRecognizerStateEnded;
+
+ [self.mapView handleRotateGesture:rotate];
+ [self.mapView handlePinchGesture:pinch];
+
+ XCTAssertFalse(self.mapView.isZooming);
+}
+
+NS_INLINE CGFloat MGLScaleFromZoomLevel(double zoom) {
+ return pow(2, zoom);
+}
+
+__unused NS_INLINE double MGLZoomLevelFromScale(CGFloat scale) {
+ return log2(scale);
+}
+
+@end