package gs.easing { public class Expo { public static function easeIn(t:Number, b:Number, c:Number, d:Number):Number { return (t==0) ? b : c * Math.pow(2, 10 * (t/d - 1)) + b - c * 0.001; } public static function easeOut(t:Number, b:Number, c:Number, d:Number):Number { return (t==d) ? b+c : c * (-Math.pow(2, -10 * t/d) + 1) + b; } public static function easeInOut(t:Number, b:Number, c:Number, d:Number):Number { if (t==0) return b; if (t==d) return b+c; if ((t/=d/2) < 1) return c/2 * Math.pow(2, 10 * (t - 1)) + b; return c/2 * (-Math.pow(2, -10 * --t) + 2) + b; } } }