5491c8c146
This auto-formats all *.dart files in the repository outside of the `engine` subdirectory and enforces that these files stay formatted with a presubmit check. **Reviewers:** Please carefully review all the commits except for the one titled "formatted". The "formatted" commit was auto-generated by running `dev/tools/format.sh -a -f`. The other commits were hand-crafted to prepare the repo for the formatting change. I recommend reviewing the commits one-by-one via the "Commits" tab and avoiding Github's "Files changed" tab as it will likely slow down your browser because of the size of this PR. --------- Co-authored-by: Kate Lovett <katelovett@google.com> Co-authored-by: LongCatIsLooong <31859944+LongCatIsLooong@users.noreply.github.com>
93 lines
2.3 KiB
Dart
93 lines
2.3 KiB
Dart
// Copyright 2014 The Flutter Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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import 'dart:math' show cos, sin;
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import 'dart:typed_data';
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import 'package:flutter/material.dart';
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class RRectBlur extends StatefulWidget {
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const RRectBlur({super.key});
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@override
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State<RRectBlur> createState() => _RRectBlurPageState();
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}
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class _RRectBlurPageState extends State<RRectBlur> with SingleTickerProviderStateMixin {
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late final AnimationController controller;
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double tick = 0.0;
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@override
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void initState() {
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super.initState();
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controller = AnimationController(vsync: this, duration: const Duration(hours: 1));
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controller.addListener(() {
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setState(() {
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tick += 1;
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});
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});
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controller.forward(from: 0);
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}
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@override
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void dispose() {
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controller.dispose();
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super.dispose();
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}
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@override
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Widget build(BuildContext context) {
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return CustomPaint(
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size: const Size(500, 500),
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painter: PointsPainter(tick),
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child: Container(),
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);
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}
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}
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class PointsPainter extends CustomPainter {
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PointsPainter(this.tick);
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final double tick;
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final Float32List data = Float32List(8000);
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static const List<Color> kColors = <Color>[
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Colors.red,
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Colors.blue,
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Colors.green,
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Colors.yellow,
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Colors.orange,
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Colors.purple,
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Colors.pink,
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Colors.deepPurple,
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];
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@override
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void paint(Canvas canvas, Size size) {
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if (size.width == 0) {
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return;
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}
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final double halfHeight = size.height / 2.0;
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const double freq = 0.25;
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const int circleCount = 40;
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for (int i = 0; i < circleCount; ++i) {
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final double radius = 25 * cos(i + (1.0 * 2.0 * 3.1415 * tick) / 60.0) + 25;
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final Paint paint =
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Paint()
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..style = PaintingStyle.fill
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..filterQuality = FilterQuality.low
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..maskFilter = MaskFilter.blur(BlurStyle.normal, radius);
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final double yval = halfHeight * sin(i + (freq * 2.0 * 3.1415 * tick) / 60.0) + halfHeight;
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final double xval = (i.toDouble() / circleCount) * size.width;
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canvas.drawCircle(Offset(xval, yval), 50, paint..color = kColors[i % kColors.length]);
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}
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}
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@override
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bool shouldRepaint(covariant CustomPainter oldDelegate) {
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return true;
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}
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}
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