import flash.filters.ColorMatrixFilter;
//
class mmt.SaturationManager {
	//
	function SaturationManager() {
		// Do Nothing
	}
	//
	public static function setSaturation(object:MovieClip, amount:Number):Void {
		amount = amount/100;
		var colorFilter = new ColorMatrixFilter();
		var redIdentity = [1, 0, 0, 0, 0];
		var greenIdentity = [0, 1, 0, 0, 0];
		var blueIdentity = [0, 0, 1, 0, 0];
		var alphaIdentity = [0, 0, 0, 1, 0];
		var grayluma = [.3, .59, .11, 0, 0];
		var colmatrix:Array = new Array();
		colmatrix = colmatrix.concat(interpolateArrays(grayluma, redIdentity, amount));
		colmatrix = colmatrix.concat(interpolateArrays(grayluma, greenIdentity, amount));
		colmatrix = colmatrix.concat(interpolateArrays(grayluma, blueIdentity, amount));
		colmatrix = colmatrix.concat(alphaIdentity);
		colorFilter.matrix = colmatrix;
		object.filters = [colorFilter];
		//
		function interpolateArrays(ary1:Array, ary2:Array, t:Number):Object {
			var result:Array = (ary1.length>=ary2.length) ? ary1.slice() : ary2.slice();
			var i = result.length;
			while (i--) {
				result[i] = ary1[i]+(ary2[i]-ary1[i])*t;
			}
			return result;
		}
	}
}