public void paint(Graphics2D g2d) {
frameNumber++;
Dimension dimension = getDimension();
BufferedImage mainStage = createMainStage();
BufferedImage frame =
mainStage.getSubimage(0, 48 - frameNumber * 2, dimension.width, dimension.height);
g2d.drawImage(frame, null, null);
Color progressbarBackgroundColor = new Color(basicColor);
Color progressbarShadowStartColor =
ColorUtils.overwriteAlpha(
ColorUtils.adjustLightness(progressbarBackgroundColor, 0.7f), 0.6f);
Color progressbarShadowEndColor =
ColorUtils.overwriteAlpha(
ColorUtils.adjustLightness(progressbarBackgroundColor, 0.3f), 0.6f);
// paint a shadow in the form of semi-transparent gradient
g2d.setPaint(
new GradientPaint(0, 0, progressbarShadowStartColor, 0, 7, progressbarShadowEndColor));
g2d.fillRect(0, 0, dimension.width, 7);
}
/**
* Creates a main stage for progress bar background.
*
* @param context resource context
* @return a <code>BufferedImage</code> object
*/
private BufferedImage createMainStage() {
Color progressbarBackgroundColor = new Color(basicColor);
Color progressbarSpiralColor = ColorUtils.adjustLightness(progressbarBackgroundColor, 0.2f);
Dimension dimension = getDimension();
BufferedImage retVal = getImageType().createImage(dimension.width, dimension.height * 2);
Graphics g = retVal.getGraphics();
try {
g.setColor(progressbarBackgroundColor);
g.fillRect(0, 0, dimension.width, dimension.height * 2);
g.setColor(progressbarSpiralColor);
for (int k : new int[] {-24, 0, 24, 48, 72}) {
g.fillPolygon(new int[] {0, 24, 24, 0}, new int[] {24 + k, k, 12 + k, 36 + k}, 4);
}
} finally {
if (g != null) {
g.dispose();
}
}
return retVal;
}