ios - How to Spin a Sprite Node by a particular force like fidget spinner -


i want spin sprite node particular force fidget spinner. when user moves finger on screen fast spinner spins faster , when user moves finger slower on screen spinner (skspritenode) spins slower.
have image of spinner assign node. want check in position stops, have list of items around node , depending on stopped, want select item. know have apply angular impulse don't know how calculate value.

like more force applied faster touch (like real spinner)

this i'm doing:

fidgetspinner.physicsbody?.applyangularimpulse(5)

angular impulse correct way go, apply force move entire body in linear fashion. physics bodies done in unit of newtons/(seconds * seconds) (with exception of applyforce, uses pixels due bug). 150 points on scene.

you need fancy extension conversions you

extension cgfloat {    public var tonewtons : cgfloat { return self / 150.0 } }

then use it, need 

let distanceinnewtons = distanceoftouch.tonewtons node.physicsbody?.applyangularimpulse(distanceinnewtons)

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