Color reds[] = { Color.red.darker(), Color.red };
for (int N = 0; N < 18; N++) {
float i = (N + 2) / 2.0f;
float x = (float) (5+i*(w/2/10));
float y = (float) (5+i*(h/2/10));
float ew = (w-10)-(i*w/10);
float eh = (h-10)-(i*h/10);
float alpha = (N == 0) ? 0.1f : 1.0f / (19.0f - N);
if ( N >= 16 )
g2.setColor(reds[N-16]);
else
g2.setColor(new Color(0f, 0f, 0f, alpha));
g2.fill(new Ellipse2D.Float(x,y,ew,eh));
}