Flutter Progress Indicator: 2 Flying Dots

Two flying dots fly at opposite directions.

import 'package:flutter/material.dart';
class HomePage extends StatefulWidget {
@override
_HomePageState createState() => _HomePageState();
}
class _HomePageState extends State<HomePage> {
@override
void initState() {
super.initState();
}
@override
void dispose() {
super.dispose();
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('Progress Indicator'),
),
body: SafeArea(
child: Center(
child: TwoFlyingDots(),
),
),
);
}
}
class TwoFlyingDots extends StatelessWidget {
@override
Widget build(BuildContext context) {
return Stack(children: [
FlyingDot(color: Colors.blue),
FlyingDot(color: Colors.red, reverse: true)
]);
}
}
class FlyingDot extends StatefulWidget {
final Color? color;
final bool? reverse;
const FlyingDot({Key? key, this.color, this.reverse}) : super(key: key);
@override
_FlyingDotState createState() => _FlyingDotState();
}
class _FlyingDotState extends State<FlyingDot>
with SingleTickerProviderStateMixin {
late AnimationController _controller;
late Animation<Offset> _position;
late Animation<Offset> _position2;
late Animation<Offset> _position3;
late bool _reverse;
double rangeX = 20.0;
double rangeY = 10.0;
@override
void initState() {
_reverse = widget.reverse ?? false;
_controller =
AnimationController(vsync: this, duration: Duration(seconds: 1));
Tween<Offset> start = _reverse
? Tween<Offset>(begin: Offset(-rangeX, 0), end: Offset(0, rangeY))
: Tween<Offset>(begin: Offset(rangeX, 0), end: Offset(0, rangeY));
Tween<Offset> middle = _reverse
? Tween<Offset>(begin: Offset(0, rangeY), end: Offset(rangeX, 0))
: Tween<Offset>(begin: Offset(0, rangeY), end: Offset(-rangeX, 0));
Tween<Offset> end = _reverse
? Tween<Offset>(begin: Offset(rangeX, 0), end: Offset(-rangeX, 0))
: Tween<Offset>(begin: Offset(-rangeX, 0), end: Offset(rangeX, 0));
_position = start.animate(
CurvedAnimation(
parent: _controller,
curve: Interval(0, 0.25),
),
);
_position2 = middle.animate(
CurvedAnimation(
parent: _controller,
curve: Interval(0.25, 0.5),
),
);
_position3 = end.animate(
CurvedAnimation(
parent: _controller,
curve: Interval(0.5, 1),
),
);
//run animation
_controller.repeat();
super.initState();
}
@override
Widget build(BuildContext context) {
return AnimatedBuilder(
animation: _controller,
builder: (context, child) {
Offset offset = Offset.zero;
if (_controller.value <= 0.25) {
offset = _position.value;
} else if (_controller.value <= 0.5) {
offset = _position2.value;
} else {
offset = _position3.value;
}
return Transform.translate(
offset: offset, child: Icon(Icons.circle, color: widget.color));
});
}
@override
void dispose() {
_controller.dispose();
super.dispose();
}
}

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