draw method
void
draw()
Implementation
void draw() {
final delta = DateTime.now().difference(startDate);
stdout.write([
'\r',
'${states[(delta.inMilliseconds ~/ animationSpeed.inMilliseconds) % states.length]} '
.dim(),
'$text ',
'(${(delta.inMilliseconds / 1000).toStringAsFixed(1)} sec.) '.dim(),
].join());
}