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Painters are a sort of user interface delegate for drawing foregrounds and backgrounds. SwingX includes some built-in painters:

Java class name:AlphaPainter	SwingXBuilder node: alphaPainter
Attribute	Expected Type
alpha	float
painters	ArrayList<Painter> or Painter[]
Java class name:BusyPainter	SwingXBuilder node: busyPainter
Attribute	Expected Type
barLength	float
barWidth	float
baseColor	Color
Java class name:CapsulePainter	SwingXBuilder node: capsulePainter
Attribute	Expected Type
portion	CapsulePainter.Portion
Java class name:CheckerboardPainter	SwingXBuilder node: checkerboardPainter
Attribute	Expected Type
squareSize	float
lightPaint	Color
darkPaint	Color
Java class name:ImagePainter	SwingXBuilder node: imagePainter
Attribute	Expected Type
image	BufferedImage
url	URL
style	AbstractAreaPainter.Style
horizontal	AbstractLayoutPainter.HorizontalAlignment
vertical	AbstractLayoutPainter.VerticalAlignment
Java class name:ImagePainter	SwingXBuilder node: imagePainter
Attribute	Expected Type
width	integer
height	integer
rounded	boolean
roundHeight	integer
roundWidth	integer
fillPaint	Color
Java class name:PinstripePainter	SwingXBuilder node: pinstripePainter
Attribute	Expected Type
paint	Paint
angle	double
stripeWidth	double
spacing	double
Java class name:MattePainter	SwingXBuilder node: mattePainter
Attribute	Expected Type
paint	Paint
paintStretched	boolean
Java class name:TextPainter	SwingXBuilder node: textPainter
Attribute	Expected Type
font	Font
text	String
paint	Paint
Java class name:GlossPainter	SwingXBuilder node: glossPainter
Attribute	Expected Type
position	GlossPainter.GlossPosition
paint	Paint

CompoundPainter

CompoundPainter, as its name indicates, is a collection of other Painters. Order is important. CompoundPainters build from back to front. Here is an example of a CompoundPainter:

comp = swing.compoundPainter(clipPreserved:true) {
            	rectanglePainter(borderWidth:3f, borderPaint:Color.BLACK,
                	areaEffects:new GlowPathEffect(), roundHeight:40, roundWidth:40,
                	insets: [3,3,3,3], paintStretched:true,style:AbstractAreaPainter.Style.FILLED,
                	fillPaint:grad)
            	pinstripePainter(paint:[204,0,0,36] as Color,angle:45, stripeWidth:8, spacing:8)

        }

AlphaPainter is a CompoundPainter as well, adding an alpha value to a collection of Painters. CompoundPainter can take the painters attribute or you can enumerate the painters inside the closure.