Flutter resize circle_wave widget - flutter

Question

Here we have a very awesome implemented widget to have this circular wave
now in this code i can't resize width and height of this widget. before posting problem i try to resolve that, but i can't
GitHub Link: demo_circle_wave
import 'dart:math' as math;
import 'dart:ui';
import 'package:flutter/material.dart';
import 'common.dart';
class DemoCircleWave extends StatefulWidget {
const DemoCircleWave({
Key key,
}) : super(key: key);
#override
_DemoCircleWaveState createState() => _DemoCircleWaveState();
}
class _DemoCircleWaveState extends State<DemoCircleWave>
with TickerProviderStateMixin {
static const colors = <Color>[
Color(0xFFFF2964),
Color(0xFF32FF3A),
Color(0xFF4255FF)
];
AnimationController controller;
AnimationController addPointController;
Animation<double> addPointAnimation;
int _counter = 0;
#override
void initState() {
super.initState();
controller = AnimationController(
vsync: this,
upperBound: 2,
duration: const Duration(seconds: 10),
)..repeat();
addPointController = AnimationController(
vsync: this,
duration: const Duration(milliseconds: 500),
);
addPointAnimation =
addPointController.drive(CurveTween(curve: Curves.ease));
}
#override
void dispose() {
controller.dispose();
super.dispose();
}
void _incrementCounter() {
setState(() {
_counter++;
addPointController.forward(from: 0);
});
}
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(title: const Text('Circle wave')),
backgroundColor: Colors.black,
body: Stack(
children: [
for (int i = 0; i < 3; i++)
Positioned.fill(
child: TweenAnimationBuilder(
tween: Tween<double>(begin: 0, end: 1),
duration: const Duration(milliseconds: 500),
curve: Curves.easeIn,
builder: (_, double opacity, __) {
return CustomPaint(
painter: CircleWavePainter(
controller,
addPointAnimation,
i,
colors[i].withOpacity(opacity),
_counter,
),
);
},
),
),
CounterText(counter: _counter),
],
),
floatingActionButton: FloatingActionButton(
onPressed: _incrementCounter,
tooltip: 'Increment',
child: const Icon(Icons.add),
),
);
}
}
class CircleWavePainter extends CustomPainter {
CircleWavePainter(
this.animation,
this.addAnimation,
this.index,
this.color,
this.count,
) : super(repaint: animation);
final Animation<double> animation;
final Animation<double> addAnimation;
final int index;
final Color color;
final int count;
static const halfPi = math.pi / 2;
static const twoPi = math.pi * 2;
final n = 7;
#override
void paint(Canvas canvas, Size size) {
final t = animation.value;
final halfWidth = size.width / 2;
final halfHeight = size.height / 2;
final q = index * halfPi;
List<Offset> computeOffsets(int length) {
final offsets = <Offset>[];
for (var i = 0; i < length; i++) {
final th = i * twoPi / length;
double os = map(math.cos(th - twoPi * t), -1, 1, 0, 1);
os = 0.125 * math.pow(os, 2.75);
final r = 165 * (1 + os * math.cos(n * th + 1.5 * twoPi * t + q));
offsets.add(Offset(
r * math.sin(th) + halfWidth, -r * math.cos(th) + halfHeight));
}
return offsets;
}
final offsets = computeOffsets(count);
if (count > 1 && addAnimation.value < 1) {
final t = addAnimation.value;
final oldOffsets = computeOffsets(count - 1);
for (var i = 0; i < count - 1; i++) {
offsets[i] = Offset.lerp(oldOffsets[i], offsets[i], t);
}
offsets[count - 1] = Offset.lerp(
oldOffsets[count - 2],
offsets[count - 1],
t,
);
}
final path = Path()..addPolygon(offsets, true);
canvas.drawPath(
path,
Paint()
..blendMode = BlendMode.lighten
..color = color
..strokeWidth = 8
..style = PaintingStyle.stroke,
);
}
#override
bool shouldRepaint(covariant CustomPainter oldDelegate) {
return false;
}
}