VelocitySource

Example: Tossable elements

Transition TossableElements {
  func setUp() {
    let gestureRecognizer = PanGestureRecognizer()
    addPlan(Draggable(withGestureRecognizer: gestureRecognizer), 
            to: target)
    addPlan(VelocitySource(gestureRecognizer, appliedTo: .layerPosition), 
            to: target)
  }
}

Contract

Upon successfull completion of a gesture recognizer, adds the velocity to a property's current velocity.

Plan VelocitySource {
  var gestureRecognizer
  var property
}

gestureRecognizer is the gesture recognizer from which the velocity should be read.

property is any animatable value on the target object.

Performer considerations

This plan goes hand-in-hand with SpringTo.