circ.as

来自「一个地图flash应用」· AS 代码 · 共 14 行

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