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Made pan gestures slipperier

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Replaced the complex formula for overpanning with a simple one that makes the map feel much slipperier than before. `MGLMapView` now overpans just a little more aggressively than `MKMapView` but still a lot less aggressively than Google Maps.

Fixes #1266.
This commit is contained in:
Minh Nguyễn
2015-04-17 12:31:49 -07:00
parent 7827d4954c
commit 2bc63f76a4
1 changed files with 2 additions and 16 deletions
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18
platform/ios/MGLMapView.mm
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@@ -677,22 +677,8 @@ mbgl::DefaultFileSource *mbglFileSource = nullptr;
else if (pan.state == UIGestureRecognizerStateEnded || pan.state == UIGestureRecognizerStateCancelled)
{
CGPoint velocity = [pan velocityInView:pan.view];
CGFloat duration = 0;
if ( ! CGPointEqualToPoint(velocity, CGPointZero))
{
CGFloat ease = 0.25;
velocity.x = velocity.x * ease;
velocity.y = velocity.y * ease;
CGFloat speed = sqrt(velocity.x * velocity.x + velocity.y * velocity.y);
CGFloat deceleration = 2500;
duration = speed / (deceleration * ease);
}
CGPoint offset = CGPointMake(velocity.x * duration / 2, velocity.y * duration / 2);
CGFloat duration = UIScrollViewDecelerationRateNormal;
CGPoint offset = CGPointMake(velocity.x * duration / 4, velocity.y * duration / 4);
mbglMap->moveBy(offset.x, offset.y, secondsAsDuration(duration));
mbglMap->setGestureInProgress(false);