Code
protected void update() {
if (!getBounds().equals(base)) {
base = getBounds();
int w = getWidth();
int h = getHeight();
if (w > 0 && h > 0) {
buf = new BufferedImage(w, h, BufferedImage.TYPE_INT_ARGB);
}
shape = new RoundRectangle2D.Double(
0, 0, w - 1, h - 1, ARC_WIDTH, ARC_HEIGHT);
}
if (buf == null) {
return;
}
Graphics2D g2 = buf.createGraphics();
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
Color c1 = new Color(0x00_F7_23_59, true);
Color c2 = new Color(0x64_44_05_F7, true);
g2.setComposite(AlphaComposite.Clear);
g2.fillRect(0, 0, getWidth(), getHeight());
g2.setComposite(AlphaComposite.Src);
g2.setPaint(new Color(getModel().isArmed() ? 0xFF_AA_AA : 0xF7_23_59));
g2.fill(shape);
if (radius > 0) {
int cx = pt.x - radius;
int cy = pt.y - radius;
int r2 = radius + radius;
float[] dist = { 0f, 1f };
Color[] colors = { c2, c1 };
g2.setPaint(new RadialGradientPaint(pt, r2, dist, colors));
g2.setComposite(AlphaComposite.SrcAtop);
// g2.setClip(shape);
g2.fill(new Ellipse2D.Double(cx, cy, r2, r2));
}
g2.dispose();
}
References
