Composition of Easing Functions

/**
 * Copyright 9re ( http://wonderfl.net/user/9re )
 * MIT License ( http://www.opensource.org/licenses/mit-license.php )
 * Downloaded from: http://wonderfl.net/c/tQj7
 */

// forked from 9re's Easing function
package  
{
	import flash.display.Sprite;
	import gs.easing.*;
	/**
	 * ...
	 * @author 9re
	 */
	public class Easing extends Sprite
	{
		public function Easing() 
		{
			var sw:int = stage.stageWidth;
			var sh:int = stage.stageHeight;
                        // draw axis
                        graphics.lineStyle(1, 0xff0000);
                        graphics.moveTo(0, sh - 150);
                        graphics.lineTo(sw, sh - 150);
                        graphics.moveTo(100, 0);
                        graphics.lineTo(100, sh);

			graphics.lineStyle(1);
			graphics.moveTo(100, sh - 180);
			for (var i:int = 1; i < sw - 200; ++i) 
			{
				graphics.lineTo(i + 100, myEasing(i, sh - 180, -sh + 250, sw - 200));
			}
		}

                public function myEasing(t:Number, b:Number, c:Number, d:Number):Number {
                    if (t < d / 2) {
                        return Quad.easeIn(t, b, c / 2, d / 2);
                    } else {
                        return Quad.easeOut(t - d / 2, b + c / 2, c / 2, d / 2);
                    }
                }
	}
}