Function withPreservingAdditiveOffset

src/index.tsx:227–247

(
  drag: Animated.Node<number>,
  state: Animated.Node<number>
)

}

function withPreservingAdditiveOffset(
  drag: Animated.Node<number>,
  state: Animated.Node<number>
) {
  const prev = new Value(0)
  const valWithPreservedOffset = new Value(0)
  return block([
    cond(
      eq(state, GestureState.BEGAN),
      [set(prev, 0)],
      [
        set(
          valWithPreservedOffset,
          add(valWithPreservedOffset, sub(drag, prev))
        ),
        set(prev, drag),
      ]
    ),
    valWithPreservedOffset,
  ])
}

function withDecaying(
  drag: Animated.Node<number>,