backgroundRingPaint method
Paint for background ring.
Creates a background ring paint with width
of the ring
Since this stays out of animation, we dont need to cache this.
Implementation
Paint backgroundRingPaint(double width) {
final _ringBackgroundColor =
backgroundColor ?? darken(colors.first.first, 85);
return Paint()
..color = _ringBackgroundColor
..strokeWidth = width
..style = PaintingStyle.stroke;
}