import de.popforge.bitmap.Shape;import flash.display.BitmapData;import flash.geom.ColorTransform;import flash.geom.Matrix;class de.popforge.bitmap.Gradient{	public static function createXYGradient(): BitmapData	{		/*		 * get canvas		 */		var g: Shape = Shape.get();					if( g == null )		{			return null;		}				var xyGradient: BitmapData = new BitmapData( 256, 256, false, 0 );				var matrix: Matrix = new Matrix();				/*		 * create y as blue colorvalues		 */				matrix.createGradientBox( 256, 256, Math.PI/2, 0, 0 );				g.beginGradientFill( 'linear', [ 0, 0x0000ff ], [ 100, 100 ], [ 0, 0xff ], matrix );		g.moveTo( 0, 0 );		g.lineTo( 256, 0 );		g.lineTo( 256, 256 );		g.lineTo( 0, 256 );		g.lineTo( 0, 0 );		g.endFill();				matrix.identity();		xyGradient.draw( g, matrix );				g.clear();				/*		 * create x as green colorvalues		 */				matrix.createGradientBox( 256, 256, 0, 0, 0 );				g.beginGradientFill( 'linear', [ 0, 0x00ff00 ], [ 100, 100 ], [ 0, 0xff ], matrix );		g.moveTo( 0, 0 );		g.lineTo( 256, 0 );		g.lineTo( 256, 256 );		g.lineTo( 0, 256 );		g.lineTo( 0, 0 );		g.endFill();				matrix.identity();		xyGradient.draw( g, matrix, null, 'add' );				g.removeMovieClip();				return xyGradient;	}		public static function createDisplacementMapFromMidMap( midmap: BitmapData ): BitmapData	{		var displace: BitmapData = createXYGradient();				if( displace == null )		{			return null;		}				var colorTransform: ColorTransform = new ColorTransform();		var m: Matrix = new Matrix();		colorTransform.greenMultiplier = .5;		colorTransform.blueMultiplier = .5;		displace.draw( displace, m, colorTransform );		colorTransform.greenOffset = 128;		colorTransform.blueOffset = 128;		displace.draw( midmap, m, colorTransform, 'difference' );				return displace;	}		/*	 * returns an array with 32bit colorvalues	 * usefull to remap a bitmap using 'paletteMap'	 */	 	public static function fillArray( colors: Array, alphas: Array, ratios: Array ): Array	{		var g: Shape = Shape.get();				if( g == null )		{			return null;		}				var array: Array = new Array;				var m: Matrix = new Matrix();				m.a = m.d = .15625;		m.b = m.c = 0;		m.tx = m.ty = 128;				g.beginGradientFill( 'linear', colors, alphas, ratios, m );		g.moveTo( 0, 0 );		g.lineTo( 256, 0 );		g.lineTo( 256, 1 );		g.lineTo( 0, 1 );
		g.lineTo( 0, 0 );		g.endFill();				var bmp: BitmapData = new BitmapData( 256, 1, true, 0 );				m.identity();				bmp.draw( g, m );				g.removeMovieClip();				var x: Number = 256;				while( --x > -1 )		{			array[x] = bmp.getPixel32( x, 0 );		}				return array;	}}