public void paintValue(Graphics g, Rectangle box) {
Graphics2D g2 = (Graphics2D) g;
g2.setRenderingHint(
RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
double[] values = (double[]) getValue();
StringBuilder s = new StringBuilder();
for (int i = 0; i < 3; i++) {
if (values.length > i) s.append(values[i]);
if (values.length > i + 1) s.append(", ");
}
if (values.length > 3) s.append("...");
g2.setPaint(Color.white);
g2.fill(box);
g2.setPaint(Color.black);
FontRenderContext context = g2.getFontRenderContext();
Rectangle2D stringBounds = g2.getFont().getStringBounds(s.toString(), context);
double w = stringBounds.getWidth();
double x = box.x;
if (w < box.width) x += (box.width - w) / 2;
double ascent = -stringBounds.getY();
double y = box.y + (box.height - stringBounds.getHeight()) / 2 + ascent;
g2.drawString(s.toString(), (float) x, (float) y);
}
private static int[] makeGradientPallet() {
BufferedImage image = new BufferedImage(100, 1, BufferedImage.TYPE_INT_RGB);
Graphics2D g2 = image.createGraphics();
Point2D start = new Point2D.Float(0f, 0f);
Point2D end = new Point2D.Float(99f, 0f);
float[] dist = {0f, .5f, 1f};
Color[] colors = {Color.RED, Color.YELLOW, Color.GREEN};
g2.setPaint(new LinearGradientPaint(start, end, dist, colors));
g2.fillRect(0, 0, 100, 1);
g2.dispose();
int width = image.getWidth(null);
int[] pallet = new int[width];
PixelGrabber pg = new PixelGrabber(image, 0, 0, width, 1, pallet, 0, width);
try {
pg.grabPixels();
} catch (InterruptedException ex) {
ex.printStackTrace();
}
return pallet;
}