paint method
Implementation
@override
paint(Canvas canvas, Paint? paint, Size size) {
var circleSpacing = 4;
var width = size.width;
var height = size.height;
for (int i = 0; i < 3; i++) {
paint!.color = paint.color.withAlpha(alphaInts[i]);
canvas.drawCircle(Offset(width / 2, height / 2),
(width / 2 - circleSpacing) * scaleDoubles[i], paint);
}
}