Window that changes color with the time

colortimer.groovy

import groovy.swing.SwingBuilder
import java.awt.BorderLayout as BL
import javax.swing.JFrame
import javax.swing.ImageIcon
import java.awt.Color
import java.awt.Graphics2D
import java.awt.image.BufferedImage
import javax.imageio.ImageIO
import javax.swing.SwingUtilities

width = 200
height = 200
BufferedImage bi = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB)
g = bi.createGraphics();

setColor = {
    time = System.currentTimeMillis()
    int rgb = time & 0xFFFFFF
    c = new Color(rgb)
    System.out.printf("r: %x g: %x b: %x\n", c.red, c.green, c.blue)
    g.setPaint(c)
    g.fillRect(0, 0, width, height)
    imagelabel.repaint()
}

new SwingBuilder().edt {
    frame(title: 'Frame', defaultCloseOperation: JFrame.EXIT_ON_CLOSE, size: [width, height+40], show: true) {
        borderLayout()
        imagelabel = label(icon: new ImageIcon(bi), constraints: BL.NORTH)
    }
}

new Thread({
    while(true) {
        SwingUtilities.invokeAndWait(setColor)
        //Thread.sleep(1000)
    }
}).start()