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• Did I fly?
• Polygon2D

Did I fly?

So I've got a free hour today, just enough to make this little thing as an answer to a question from Tweener list. For this example, I will (ab)use Petrie, little pteranodon who was affraid to fly. So, here goes a little helper class for tweening your DisplayObject along parabolic projectile:

package
{
	import flash.display.DisplayObject
	import flash.geom.Point
	public class projectile
	{
		public function projectile (obj:DisplayObject = null)
		{
			_obj = obj;
		}
		public var g:Number = 1;
		public var v0:Point = new Point ();
		public var r0:Point = new Point ();

		private var _obj:DisplayObject;
		private var _t:Number = 0;

		public function get t():Number { return _t; }
		public function set t(val:Number):void
		{
			_t = val;
			if (_obj != null)
			{
				_obj.x = r.x; _obj.y = r.y;
			}
		}

		// physics
		public function get r():Point
		{
			return new Point (r0.x + v0.x * t,
			r0.y + v0.y * t + 0.5 * g * t * t);
		}
	}
}

How does it work? This article will give you verbose answer, I will simply give you the code this time:

Clickety click.