Tutorial: Swing Synth PLAF Template - Part 5: Gradients

	/** Paint the component using a gradient based on the two provided colors. */
    public static void paintVerticalGradient(Graphics g, int x, int y, int w, int h, int arc, Color fg, Color bg) {
        Graphics2D g2 = (Graphics2D)g;
        g2.setPaint(getGradient(x, y, h, fg, bg));
        g2.fillRoundRect(x, y, w - 1, h - 1, arc, arc);
        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
        g2.setColor(fg);
        g2.setStroke(THIN_STROKE);
        g2.drawRoundRect(x, y, w - 1, h - 1, arc, arc);
    }

    public static GradientPaint getGradient(int x, int y, int h, Color fg, Color bg) {
        return new GradientPaint(x, y, bg, x, y + h, fg);
    }

	private GradientPaint getGradient(SynthContext context, int x, int y, int h) {
		// For simplicity this always recreates the GradientPaint. In a
		// real app you should cache this to avoid garbage.
		return new GradientPaint(x, y, context.getStyle().getColor(context, ColorType.BACKGROUND), 
				x, y + h, context.getStyle().getColor(context, ColorType.FOREGROUND));
	}

	private void paintVerticalGradient(SynthContext context, Graphics g, int x, int y, int w, int h) {
        final int arc = getArc(context);
        Graphics2D g2 = (Graphics2D)g;
        g2.setPaint(getGradient(context, x, y, h));
        g2.fillRoundRect(x, y, w - 1, h - 1, arc, arc);
        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
        g2.setColor(context.getStyle().getColor(context, ColorType.FOREGROUND));
        g2.setStroke(THIN_STROKE);
        g2.drawRoundRect(x, y, w - 1, h - 1, arc, arc);
    }
    @Override
    public void paintButtonBackground(SynthContext context,Graphics g, int x, int y,int w, int h) {
        paintVerticalGradient(context, g, x, y, w, h);
    }