Question

I am rotating an object with TweenLite, however instead of a set duration I want the duration to be based upon the distance of rotation where 180 degrees = 3 seconds 90 = 1.5 and so on.

Here is my attempt to find the distance of rotation:

var time:Number = Math.abs(Math.atan2(Math.sin(angle-wheelObj.rotation),Math.cos(angle-wheelObj.rotation)); 
TweenLite.to(wheelObj, time, {shortRotation:{rotation:angle}, ease:Expo.easeOut, onComplete:rotateWheel, onCompleteParams:[target]});
TweenLite.to(carObj, time, {shortRotation:{rotation:angle}, ease:Expo.easeOut});

This just isn’t working, time is sometimes huge when the rotation is small and sometimes tiny when it is big, so does anyone know a better way to do this?

Notes:

angle = target rotation

wheelObj.rotation = current rotation.

Answer 1

var speed:Number = 60; // 3 sec for 180 deg
var time:Number = Math.abs(angle - wheelObj.rotation) / speed;

You can set duration by changing speed parameter.

Note: You might need to use angle as (angle%360)