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