equations.as

Papervision3d的源码

 		 *
		 * @param t		Current time (in frames or seconds).
		 * @param b		Starting value.
		 * @param c		Change needed in value.
		 * @param d		Expected easing duration (in frames or seconds).
		 * @return		The correct value.
		 */
		public static function easeOutQuart (t:Number, b:Number, c:Number, d:Number, p_params:Object = null):Number {
			return -c * ((t=t/d-1)*t*t*t - 1) + b;
		}
	
		/**
		 * Easing equation function for a quartic (t^4) easing in/out: acceleration until halfway, then deceleration.
 		 *
		 * @param t		Current time (in frames or seconds).
		 * @param b		Starting value.
		 * @param c		Change needed in value.
		 * @param d		Expected easing duration (in frames or seconds).
		 * @return		The correct value.
		 */
		public static function easeInOutQuart (t:Number, b:Number, c:Number, d:Number, p_params:Object = null):Number {
			if ((t/=d/2) < 1) return c/2*t*t*t*t + b;
			return -c/2 * ((t-=2)*t*t*t - 2) + b;
		}
	
		/**
		 * Easing equation function for a quartic (t^4) easing out/in: deceleration until halfway, then acceleration.
 		 *
		 * @param t		Current time (in frames or seconds).
		 * @param b		Starting value.
		 * @param c		Change needed in value.
		 * @param d		Expected easing duration (in frames or seconds).
		 * @return		The correct value.
		 */
		public static function easeOutInQuart (t:Number, b:Number, c:Number, d:Number, p_params:Object = null):Number {
			if (t < d/2) return easeOutQuart (t*2, b, c/2, d, p_params);
			return easeInQuart((t*2)-d, b+c/2, c/2, d, p_params);
		}
	
		/**
		 * Easing equation function for a quintic (t^5) easing in: accelerating from zero velocity.
 		 *
		 * @param t		Current time (in frames or seconds).
		 * @param b		Starting value.
		 * @param c		Change needed in value.
		 * @param d		Expected easing duration (in frames or seconds).
		 * @return		The correct value.
		 */
		public static function easeInQuint (t:Number, b:Number, c:Number, d:Number, p_params:Object = null):Number {
			return c*(t/=d)*t*t*t*t + b;
		}
	
		/**
		 * Easing equation function for a quintic (t^5) easing out: decelerating from zero velocity.
 		 *
		 * @param t		Current time (in frames or seconds).
		 * @param b		Starting value.
		 * @param c		Change needed in value.
		 * @param d		Expected easing duration (in frames or seconds).
		 * @return		The correct value.
		 */
		public static function easeOutQuint (t:Number, b:Number, c:Number, d:Number, p_params:Object = null):Number {
			return c*((t=t/d-1)*t*t*t*t + 1) + b;
		}
	
		/**
		 * Easing equation function for a quintic (t^5) easing in/out: acceleration until halfway, then deceleration.
 		 *
		 * @param t		Current time (in frames or seconds).
		 * @param b		Starting value.
		 * @param c		Change needed in value.
		 * @param d		Expected easing duration (in frames or seconds).
		 * @return		The correct value.
		 */
		public static function easeInOutQuint (t:Number, b:Number, c:Number, d:Number, p_params:Object = null):Number {
			if ((t/=d/2) < 1) return c/2*t*t*t*t*t + b;
			return c/2*((t-=2)*t*t*t*t + 2) + b;
		}
	
		/**
		 * Easing equation function for a quintic (t^5) easing out/in: deceleration until halfway, then acceleration.
 		 *
		 * @param t		Current time (in frames or seconds).
		 * @param b		Starting value.
		 * @param c		Change needed in value.
		 * @param d		Expected easing duration (in frames or seconds).
		 * @return		The correct value.
		 */
		public static function easeOutInQuint (t:Number, b:Number, c:Number, d:Number, p_params:Object = null):Number {
			if (t < d/2) return easeOutQuint (t*2, b, c/2, d, p_params);
			return easeInQuint((t*2)-d, b+c/2, c/2, d, p_params);
		}
	
		/**
		 * Easing equation function for a sinusoidal (sin(t)) easing in: accelerating from zero velocity.
 		 *
		 * @param t		Current time (in frames or seconds).
		 * @param b		Starting value.
		 * @param c		Change needed in value.
		 * @param d		Expected easing duration (in frames or seconds).
		 * @return		The correct value.
		 */
		public static function easeInSine (t:Number, b:Number, c:Number, d:Number, p_params:Object = null):Number {
			return -c * Math.cos(t/d * (Math.PI/2)) + c + b;
		}
	
		/**
		 * Easing equation function for a sinusoidal (sin(t)) easing out: decelerating from zero velocity.
 		 *
		 * @param t		Current time (in frames or seconds).
		 * @param b		Starting value.
		 * @param c		Change needed in value.
		 * @param d		Expected easing duration (in frames or seconds).
		 * @return		The correct value.
		 */
		public static function easeOutSine (t:Number, b:Number, c:Number, d:Number, p_params:Object = null):Number {
			return c * Math.sin(t/d * (Math.PI/2)) + b;
		}
	
		/**
		 * Easing equation function for a sinusoidal (sin(t)) easing in/out: acceleration until halfway, then deceleration.
 		 *
		 * @param t		Current time (in frames or seconds).
		 * @param b		Starting value.
		 * @param c		Change needed in value.
		 * @param d		Expected easing duration (in frames or seconds).
		 * @return		The correct value.
		 */
		public static function easeInOutSine (t:Number, b:Number, c:Number, d:Number, p_params:Object = null):Number {
			return -c/2 * (Math.cos(Math.PI*t/d) - 1) + b;
		}
	
		/**
		 * Easing equation function for a sinusoidal (sin(t)) easing out/in: deceleration until halfway, then acceleration.
 		 *
		 * @param t		Current time (in frames or seconds).
		 * @param b		Starting value.
		 * @param c		Change needed in value.
		 * @param d		Expected easing duration (in frames or seconds).
		 * @return		The correct value.
		 */
		public static function easeOutInSine (t:Number, b:Number, c:Number, d:Number, p_params:Object = null):Number {
			if (t < d/2) return easeOutSine (t*2, b, c/2, d, p_params);
			return easeInSine((t*2)-d, b+c/2, c/2, d, p_params);
		}
	
		/**
		 * Easing equation function for an exponential (2^t) easing in: accelerating from zero velocity.
 		 *
		 * @param t		Current time (in frames or seconds).
		 * @param b		Starting value.
		 * @param c		Change needed in value.
		 * @param d		Expected easing duration (in frames or seconds).
		 * @return		The correct value.
		 */
		public static function easeInExpo (t:Number, b:Number, c:Number, d:Number, p_params:Object = null):Number {
			return (t==0) ? b : c * Math.pow(2, 10 * (t/d - 1)) + b - c * 0.001;
		}
	
		/**
		 * Easing equation function for an exponential (2^t) easing out: decelerating from zero velocity.
 		 *
		 * @param t		Current time (in frames or seconds).
		 * @param b		Starting value.
		 * @param c		Change needed in value.
		 * @param d		Expected easing duration (in frames or seconds).
		 * @return		The correct value.
		 */
		public static function easeOutExpo (t:Number, b:Number, c:Number, d:Number, p_params:Object = null):Number {
			return (t==d) ? b+c : c * 1.001 * (-Math.pow(2, -10 * t/d) + 1) + b;
		}
	
		/**
		 * Easing equation function for an exponential (2^t) easing in/out: acceleration until halfway, then deceleration.
 		 *
		 * @param t		Current time (in frames or seconds).
		 * @param b		Starting value.
		 * @param c		Change needed in value.
		 * @param d		Expected easing duration (in frames or seconds).
		 * @return		The correct value.
		 */
		public static function easeInOutExpo (t:Number, b:Number, c:Number, d:Number, p_params:Object = null):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 - c * 0.0005;
			return c/2 * 1.0005 * (-Math.pow(2, -10 * --t) + 2) + b;
		}
	
		/**
		 * Easing equation function for an exponential (2^t) easing out/in: deceleration until halfway, then acceleration.
 		 *
		 * @param t		Current time (in frames or seconds).
		 * @param b		Starting value.
		 * @param c		Change needed in value.
		 * @param d		Expected easing duration (in frames or seconds).
		 * @return		The correct value.
		 */
		public static function easeOutInExpo (t:Number, b:Number, c:Number, d:Number, p_params:Object = null):Number {
			if (t < d/2) return easeOutExpo (t*2, b, c/2, d, p_params);
			return easeInExpo((t*2)-d, b+c/2, c/2, d, p_params);
		}
	
		/**
		 * Easing equation function for a circular (sqrt(1-t^2)) easing in: accelerating from zero velocity.
 		 *
		 * @param t		Current time (in frames or seconds).
		 * @param b		Starting value.
		 * @param c		Change needed in value.
		 * @param d		Expected easing duration (in frames or seconds).
		 * @return		The correct value.
		 */
		public static function easeInCirc (t:Number, b:Number, c:Number, d:Number, p_params:Object = null):Number {
			return -c * (Math.sqrt(1 - (t/=d)*t) - 1) + b;
		}
	
		/**
		 * Easing equation function for a circular (sqrt(1-t^2)) easing out: decelerating from zero velocity.
 		 *
		 * @param t		Current time (in frames or seconds).
		 * @param b		Starting value.
		 * @param c		Change needed in value.
		 * @param d		Expected easing duration (in frames or seconds).
		 * @return		The correct value.
		 */
		public static function easeOutCirc (t:Number, b:Number, c:Number, d:Number, p_params:Object = null):Number {
			return c * Math.sqrt(1 - (t=t/d-1)*t) + b;
		}
	
		/**
		 * Easing equation function for a circular (sqrt(1-t^2)) easing in/out: acceleration until halfway, then deceleration.
 		 *
		 * @param t		Current time (in frames or seconds).
		 * @param b		Starting value.
		 * @param c		Change needed in value.
		 * @param d		Expected easing duration (in frames or seconds).
		 * @return		The correct value.
		 */
		public static function easeInOutCirc (t:Number, b:Number, c:Number, d:Number, p_params:Object = null):Number {
			if ((t/=d/2) < 1) return -c/2 * (Math.sqrt(1 - t*t) - 1) + b;