bounce.as

来自「一个地图flash应用」· AS 代码 · 共 22 行

package gs.easing {
	public class Bounce {
		public static function easeOut (t:Number, b:Number, c:Number, d:Number):Number {
			if ((t/=d) < (1/2.75)) {
				return c*(7.5625*t*t) + b;
			} else if (t < (2/2.75)) {
				return c*(7.5625*(t-=(1.5/2.75))*t + .75) + b;
			} else if (t < (2.5/2.75)) {
				return c*(7.5625*(t-=(2.25/2.75))*t + .9375) + b;
			} else {
				return c*(7.5625*(t-=(2.625/2.75))*t + .984375) + b;
			}
		}
		public static function easeIn (t:Number, b:Number, c:Number, d:Number):Number {
			return c - easeOut(d-t, 0, c, d) + b;
		}
		public static function easeInOut (t:Number, b:Number, c:Number, d:Number):Number {
			if (t < d/2) return easeIn (t*2, 0, c, d) * .5 + b;
			else return easeOut (t*2-d, 0, c, d) * .5 + c*.5 + b;
		}
	}
}