package  
{
    import com.greensock.TimelineMax;
    import com.greensock.TweenMax;
    import com.greensock.easing.Linear;
    import com.greensock.easing.Quart;
 
    import flash.display.Sprite;
 
    /**
     * @author John Lindquist
     */
    [SWF(width="900", height="480", frameRate="31")]
    public class EasingATimeline extends Sprite 
    {
        private var square:Sprite;
        private static const STEP_DURATION:Number = 1;
 
        public function EasingATimeline()
        {
            square = new Sprite();	
            square.graphics.beginFill(0xcc0000);
            square.graphics.drawRect(0, 0, 50, 50);
            square.graphics.endFill();
 
            square.x = 100;
            square.y = 50;
 
            addChild(square);
 
            //set all the eases of your steps to Linear.easeNone
            var step1:TweenMax = TweenMax.to(square, STEP_DURATION, {x: 700, y: 50, ease: Linear.easeNone});
            var step2:TweenMax = TweenMax.to(square, STEP_DURATION, {x: 700, y: 350, ease: Linear.easeNone});
            var step3:TweenMax = TweenMax.to(square, STEP_DURATION, {x: 100, y: 350, ease: Linear.easeNone});
            var step4:TweenMax = TweenMax.to(square, STEP_DURATION, {x: 100, y: 50, ease: Linear.easeNone});
 
            var timeline:TimelineMax = new TimelineMax();
            timeline.append(step1);
            timeline.append(step2);
            timeline.append(step3);
            timeline.append(step4);
            //pause your timeline
            timeline.pause();
 
            //tween your timeline with whatever ease you want
            TweenMax.to(timeline, timeline.totalDuration, {currentTime: timeline.totalDuration, ease: Quart.easeInOut, repeat: -1});
        }
    }
}