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Added drift-rotation effect after rotation gesture

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Minh Nguyễn
2015-04-18 20:50:35 -07:00
parent 41d28e7203
commit 33aeecef22
1 changed files with 34 additions and 5 deletions
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39
platform/ios/MGLMapView.mm
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@@ -839,11 +839,40 @@ mbgl::DefaultFileSource *mbglFileSource = nullptr;
}
else if (rotate.state == UIGestureRecognizerStateEnded || rotate.state == UIGestureRecognizerStateCancelled)
{
mbglMap->setGestureInProgress(false);
[self unrotateIfNeededAnimated:YES];
[self notifyMapChange:@(mbgl::MapChangeRegionDidChange)];
CGFloat velocity = rotate.velocity;
if (fabs(velocity) > 5)
{
CGFloat radians = self.angle + rotate.rotation;
CGFloat duration = UIScrollViewDecelerationRateNormal;
CGFloat newRadians = radians + velocity * duration * 0.1;
CGFloat newDegrees = fmodf([MGLMapView radiansToDegrees:newRadians], 360) * -1;
mbglMap->setBearing(newDegrees, secondsAsDuration(duration));
mbglMap->setGestureInProgress(false);
self.animatingGesture = YES;
__weak MGLMapView *weakSelf = self;
[self animateWithDelay:duration animations:^
{
weakSelf.animatingGesture = NO;
[weakSelf unrotateIfNeededAnimated:YES];
[weakSelf notifyMapChange:@(mbgl::MapChangeRegionDidChangeAnimated)];
}];
}
else
{
mbglMap->setGestureInProgress(false);
[self unrotateIfNeededAnimated:YES];
[self notifyMapChange:@(mbgl::MapChangeRegionDidChange)];
}
}
}