112 lines
2.8 KiB
Dart
112 lines
2.8 KiB
Dart
import 'dart:math';
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import 'package:flutter/material.dart';
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/// create by 张风捷特烈 on 2020/11/2
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/// contact me by email 1981462002@qq.com
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/// 说明:
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///
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class Paper extends StatefulWidget {
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final Color color;
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const Paper({Key? key, this.color = Colors.lightBlue}) : super(key: key);
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@override
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_PaperState createState() => _PaperState();
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}
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class _PaperState extends State<Paper> with SingleTickerProviderStateMixin {
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late AnimationController _controller;
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final ValueNotifier<Color> _color = ValueNotifier<Color>(Colors.blue);
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@override
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void initState() {
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super.initState();
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_controller = AnimationController(
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lowerBound: 10,
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upperBound: 40,
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duration: const Duration(seconds: 1),
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vsync: this,
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);
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_controller.addStatusListener(_statusListen);
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_controller.forward();
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// _controller.repeat(reverse: true);
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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 Center(
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child: CustomPaint(
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size: Size(100, 100),
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painter: PicManPainter(
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color: _color,
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angle: _controller,
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repaint: Listenable.merge([_controller, _color])), // 背景
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),
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);
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}
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void _statusListen(AnimationStatus status) {
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switch (status) {
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case AnimationStatus.dismissed:
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_color.value = Colors.black;
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break;
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case AnimationStatus.forward:
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_color.value = Colors.blue;
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break;
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case AnimationStatus.reverse:
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_color.value = Colors.red;
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break;
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case AnimationStatus.completed:
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_color.value = Colors.green;
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break;
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}
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}
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}
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class PicManPainter extends CustomPainter {
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final Animation<double> angle;
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final Listenable repaint;
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final ValueNotifier<Color> color;
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PicManPainter({required this.color,required this.angle, required this.repaint})
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: super(repaint: repaint);
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Paint _paint = Paint();
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@override
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void paint(Canvas canvas, Size size) {
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canvas.clipRect(Offset.zero & size); //剪切画布
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final double radius = size.width / 2;
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canvas.translate(radius, size.height / 2);
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_drawHead(canvas, size);
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_drawEye(canvas, radius);
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}
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//绘制头
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void _drawHead(Canvas canvas, Size size) {
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var rect = Rect.fromCenter(
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center: Offset(0, 0), height: size.width, width: size.height);
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var a = angle.value / 180 * pi;
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canvas.drawArc(
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rect, a, 2 * pi - a.abs() * 2, true, _paint..color = color.value);
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}
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//绘制眼睛
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void _drawEye(Canvas canvas, double radius) {
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canvas.drawCircle(Offset(radius * 0.15, -radius * 0.6), radius * 0.12,
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_paint..color = Colors.white);
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}
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@override
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bool shouldRepaint(covariant PicManPainter oldDelegate) =>
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oldDelegate.repaint != repaint;
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}
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