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[ios] Improve tilt gesture performance (#13902)

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This commit is contained in:
Felix Wehnert
2019-02-12 02:28:44 +01:00
committed by Jason Wray
parent e1092e4148
commit 57438c2a7e
2 changed files with 6 additions and 4 deletions
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9
platform/ios/src/MGLMapView.mm
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@@ -1968,9 +1968,11 @@ public:
[self cancelTransitions];
self.cameraChangeReasonBitmask |= MGLCameraChangeReasonGestureTilt;
static CGFloat initialPitch;
if (twoFingerDrag.state == UIGestureRecognizerStateBegan)
{
initialPitch = self.mbglMap.getPitch();
[self trackGestureEvent:MMEEventGesturePitchStart forRecognizer:twoFingerDrag];
[self notifyGestureDidBegin];
}
@@ -1978,10 +1980,9 @@ public:
if (twoFingerDrag.state == UIGestureRecognizerStateBegan || twoFingerDrag.state == UIGestureRecognizerStateChanged)
{
CGFloat gestureDistance = CGPoint([twoFingerDrag translationInView:twoFingerDrag.view]).y;
CGFloat currentPitch = self.mbglMap.getPitch();
CGFloat slowdown = 20.0;
CGFloat slowdown = 2.0;
CGFloat pitchNew = currentPitch - (gestureDistance / slowdown);
CGFloat pitchNew = initialPitch - (gestureDistance / slowdown);
CGPoint centerPoint = [self anchorPointForGesture:twoFingerDrag];