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spinning_square.dart
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spinning_square.dart
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// Copyright 2014 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
import 'package:flutter/widgets.dart';
class SpinningSquare extends StatefulWidget {
const SpinningSquare({super.key});
@override
State<SpinningSquare> createState() => _SpinningSquareState();
}
class _SpinningSquareState extends State<SpinningSquare> with SingleTickerProviderStateMixin {
// We use 3600 milliseconds instead of 1800 milliseconds because 0.0 -> 1.0
// represents an entire turn of the square whereas in the other examples
// we used 0.0 -> math.pi, which is only half a turn.
late final AnimationController _animation = AnimationController(
duration: const Duration(milliseconds: 3600),
vsync: this,
)..repeat();
@override
void dispose() {
_animation.dispose();
super.dispose();
}
@override
Widget build(BuildContext context) {
return RotationTransition(
turns: _animation,
child: Container(
width: 200.0,
height: 200.0,
color: const Color(0xFF00FF00),
),
);
}
}
void main() {
runApp(const Center(child: SpinningSquare()));
}