/**
 * Draws the gradient background for
 * this component on initialize and resize.
 */
private function _createGradientBackground():void
{
   var fillType:String      = GradientType.LINEAR;
   var colors:Array         = [ 0xe9e9e9, 0xc7c7c7 ];
   var alphas:Array         = [ 1, 1 ];
   var ratios:Array         = [ 0, 255 ];
   var matrix:Matrix        = new Matrix();
       matrix.createGradientBox( width, 34, Math.PI/2, 0, 0 );
   var spreadMethod:String 	= SpreadMethod.PAD;
   var g:Graphics           = this.graphics;
       g.clear();
       g.beginGradientFill( fillType, colors, alphas, ratios, matrix, spreadMethod );
       g.drawRect( 0, 0, width, height );
       g.endFill();
}

package labs.otuome.fl.graphics
{
	import flash.display.GradientType;
	import flash.display.Graphics;
	import flash.display.SpreadMethod;
	import flash.display.Sprite;
	import flash.geom.Matrix;
 
	/**
	 * Util class to create linear gradient fills.
	 * @author Hasan Otuome
	 */
	public class LinearGradientUtil
	{
		///////////////////////////////////////////////////////////////////////////////////////////////
		// PRIVATE PROPERTIES
		///////////////////////////////////////////////////////////////////////////////////////////////
 
		///////////////////////////////////////////////////////////////////////////////////////////////
		// PUBLIC PROPERTIES
		///////////////////////////////////////////////////////////////////////////////////////////////
		public static const HORIZONTAL:String 		= 'horizontalLinearGradient';
		public static const VERTICAL:String 		= 'verticalLinearGradient';
		///////////////////////////////////////////////////////////////////////////////////////////////
		// PUBLIC METHODS
		///////////////////////////////////////////////////////////////////////////////////////////////
		/**
		 * Draws the linear gradient to the .graphics
		 * property of the specified component. Defaults
		 * to a Web 2.0 style gray gradient.
		 *
		 * @param target The display object to apply the gradient to.
		 * @param size For a vertical gradient this is the
		 * height of the gradient. For a horizontal gradient,
		 * this is the width of the gradient.
		 * @param primaryColor The top or left-most color depending on orientation.
		 * @param secondaryColor The bottom or right-most color depending on orientation.
		 * @param primaryAlpha The top or left-most color depending on orientation.
		 * @param secondaryAlpha The bottom or right-most alpha depending on orientation.
		 * @param primaryRatio The ratio of the top or left-most color depending on orientation.
		 * @param secondaryRatio The ratio of the bottom or right-most color depending on orientation.
		 * @param orientation either horizontal or vertical. defaults to vertical.
		 * @param invert Toggle that switches what the method considers primary and secondary.
		 */
		public static function createGradientBackground( target:Sprite,
						size:uint=34,
						cornerRadius:uint=0,
						primaryColor:uint=0xe9e9e9,
						secondaryColor:uint=0xc7c7c7,
						primaryAlpha:uint=1,
						secondaryAlpha:uint=1,
						primaryRatio:uint=0,
						secondaryRatio:uint=255,
						orientation:String=LinearGradientUtil.HORIZONTAL,
						invert:Boolean=false ):void
		{
			var fillType:String;
			var colors:Array;
			var alphas:Array;
			var ratios:Array;
			var matrix:Matrix;
			var spreadMethod:String;
			var g:Graphics;
 
			fillType 			= GradientType.LINEAR;
			colors 				= _createColorsArray( primaryColor, secondaryColor, invert );
			alphas 				= _createAlphasArray( primaryAlpha, secondaryAlpha, invert );
			ratios 				= _createRatiosArray( primaryRatio, secondaryRatio, invert );
			matrix 				= new Matrix();
 
			switch (orientation)
			{
				case LinearGradientUtil.HORIZONTAL:
					matrix.createGradientBox( size, target.height, Math.PI/2, 0, 0 );
					break;
				case LinearGradientUtil.VERTICAL:
					matrix.createGradientBox( target.width, size, Math.PI/2, 0, 0 );
					break;
			}
 
			spreadMethod 		= SpreadMethod.PAD;
 
			g 					= target.graphics;
			g.clear();
			g.beginGradientFill( fillType, colors, alphas, ratios, matrix, spreadMethod );
 
			if (cornerRadius > 0)
			{
				g.drawRoundRect( 0, 0, target.width, target.height, cornerRadius );
			}
			else
			{
				g.drawRect( 0, 0, target.width, target.height );
			}
 
			g.endFill();
		}
		///////////////////////////////////////////////////////////////////////////////////////////////
		// OVERRIDES
		///////////////////////////////////////////////////////////////////////////////////////////////
 
		///////////////////////////////////////////////////////////////////////////////////////////////
		// PRIVATE METHODS
		///////////////////////////////////////////////////////////////////////////////////////////////
		/**
		 * Creates the colors array required by the main method.
		 * @param colorOne
		 * @param colorTwo
		 * @param inverted
		 * @return The gradient colors array.
		 */
		private static function _createColorsArray( colorOne:uint,
						colorTwo:uint,
						inverted:Boolean=false ):Array
		{
			var colors:Array;
			if (!inverted)
			{
				colors = [ colorOne, colorTwo ];
			}
			else
			{
				colors = [ colorTwo, colorOne ];
			}
			return colors;
		}
		/**
		 * Creates the alphas array required by the main method.
		 * @param colorOneAlpha
		 * @param colorTwoAlpha
		 * @param inverted
		 * @return The gradient alphas array.
		 */
		private static function _createAlphasArray( colorOneAlpha:uint,
						colorTwoAlpha:uint,
						inverted:Boolean=false ):Array
		{
			var alphas:Array;
			if (!inverted)
			{
				alphas = [ colorOneAlpha, colorTwoAlpha ];
			}
			else
			{
				alphas = [ colorTwoAlpha, colorOneAlpha ];
			}
			return alphas;
		}
		/**
		 * Creates the ratios array required by the main method.
		 * @param colorOneRatio
		 * @param colorTwoRatio
		 * @param inverted
		 * @return The gradient ratios array.
		 */
		private static function _createRatiosArray( colorOneRatio:uint,
						colorTwoRatio:uint,
						inverted:Boolean=false ):Array
		{
			var ratios:Array;
			if (!inverted)
			{
				ratios = [ colorOneRatio, colorTwoRatio ];
			}
			else
			{
				ratios = [ colorTwoRatio, colorOneRatio ];
			}
			return ratios;
		}
	}
}

/**
 * Draws the gradient background for
 * this component on initialize and resize.
 */
private function _createGradientBackground():void
{
//	LinearGradientUtil.createGradientBackground( this, this.height, getStyle('cornerRadius'), 0xfdfeff, 0xe9e9e9 ); // changing color scheme
//	LinearGradientUtil.createGradientBackground( this ); // using the default color scheme
}