Greensock’s ThrowPropsPlugin iPad Test

Heres a quick video showing how You can use the Greensock’s ThrowPropsPlugin to emulate the bouncy effect of the iOS devices, on the example I used an image but it can also be used with TextFields or Lists and it performs equally good on the iPad.

ThrowPropsPlugin is a plugin for TweenLite and TweenMax that allows you to simply define an initial velocity for a property (or multiple properties) as well as optional maximum and/or minimum end values and then it will calculate the appropriate landing position and plot a smooth course based on the easing equation you define (Quad.easeOut by default, as set in TweenLite). This is perfect for flick-scrolling or animating things as though they are being thrown

For the code part I just used Jack’s sample with some minor tweaks to use an image instead of a TextField.
Here is the class:

package {
	import flash.display.MovieClip;
	import flash.display.Shape;
	import flash.utils.getTimer;
	import com.greensock.TweenLite;
	import com.greensock.easing.Strong;
	import com.greensock.plugins.TweenPlugin;
	import com.greensock.plugins.ThrowPropsPlugin;
	import flash.geom.Rectangle;
	public class MainApp extends MovieClip {
		private var bounds : Rectangle;
		private var mc : MovieClip;
		private var t1:uint, t2:uint, y1:Number, y2:Number, x1:Number, x2:Number;
		public function MainApp() {
		private function initialize():void {
			bounds = new Rectangle(-128, 0, 768+128, 1024);
			mc = getChildByName("robots_mc") as MovieClip;
			setUpTPBounds(mc, bounds);
			mc.addEventListener(MouseEvent.MOUSE_DOWN, mouseDownHandler);

		private function mouseDownHandler(event:MouseEvent):void {
			x1 = x2 = mc.x;
			y1 = y2 = mc.y;
			t1 = t2 = getTimer();
			mc.addEventListener(Event.ENTER_FRAME, enterFrameHandler);
			mc.stage.addEventListener(MouseEvent.MOUSE_UP, mouseUpHandler);

		private function enterFrameHandler(event:Event):void {
				x2 = x1;
				y2 = y1;
				t2 = t1;
				x1 = mc.x;
				y1 = mc.y;
				t1 = getTimer();

		private function mouseUpHandler(event:MouseEvent):void {
			mc.stage.removeEventListener(MouseEvent.MOUSE_UP, mouseUpHandler);
			mc.removeEventListener(Event.ENTER_FRAME, enterFrameHandler);
			var time:Number = (getTimer() - t2) / 1000;
			var xVelocity:Number = (mc.x - x2) / time;
			var xOverlap:Number = Math.max(0, mc.width - bounds.width);
			var yVelocity:Number = (mc.y - y2) / time;
			var yOverlap:Number = Math.max(0, mc.height - bounds.height);, {throwProps:{
										 y:{velocity:yVelocity,, - yOverlap, resistance:300},
										 x:{velocity:xVelocity, max:bounds.left, min:bounds.left - xOverlap, resistance:300}
									 }, ease:Strong.easeOut
									}, 10, 0.3, 1);

		private function setUpTPBounds(container : MovieClip, bounds : Rectangle):void {
			var crop:Shape = new Shape();, 1);, bounds.y, bounds.width, bounds.height);;
			container.x = bounds.x;
			container.y = bounds.y;
			container.mask = crop;


To know more about this plugin visit Greensock’s ThrowPropsPlugin page and check out the ASDocs.

Note: ThrowPropsPlugin is a membership benefit of Club GreenSock (“Shockingly Green” and corporate levels). If you’re not a member yet,I suggest you sign up, believe Me is really worthy.

Happy Coding