forked from lxm_flutter/FlutterUnit
103 lines
2.6 KiB
Dart
103 lines
2.6 KiB
Dart
import 'dart:math';
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import 'package:flutter/material.dart';
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import 'package:flutter/services.dart';
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import 'particle.dart';
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import 'package:image/image.dart' as image;
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import 'particle_manage.dart';
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import 'world_render.dart';
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/// create by 张风捷特烈 on 2020/11/5
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/// contact me by email 1981462002@qq.com
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/// 说明:
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class SplitImage extends StatefulWidget {
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const SplitImage({Key? key}) : super(key: key);
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@override
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_SplitImageState createState() => _SplitImageState();
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}
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class _SplitImageState extends State<SplitImage> with SingleTickerProviderStateMixin {
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late AnimationController _controller;
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late ParticleManage pm;
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Random random = Random();
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@override
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void initState() {
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super.initState();
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pm = ParticleManage(
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onEnd: (){
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_controller.stop();
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}
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);
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initParticles();
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_controller = AnimationController(
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duration: const Duration(seconds: 1),
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vsync: this,
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)..addListener(pm.tick);
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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 LayoutBuilder(
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builder: (_,constraints){
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pm.size = constraints.biggest;
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return Stack(
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children: [
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GestureDetector(
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onTap: (){
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initParticles();
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_controller.reset();
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_controller.repeat();
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},
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child: CustomPaint(
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size: pm.size,
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painter: WorldRender(manage: pm),
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),
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),
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],
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);
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},
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);
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}
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void initParticles() async {
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pm.particles.clear();
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ByteData data = await rootBundle.load("assets/images/flutter.png");
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List<int> bytes = data.buffer.asUint8List(data.offsetInBytes, data.lengthInBytes);
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image.Image? imageSrc = image.decodeImage(bytes);
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if(imageSrc==null) return;
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double offsetX= (pm.size.width-imageSrc.width)/2;
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double offsetY= (pm.size.height-imageSrc.height)/2;
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for (int i = 0; i < imageSrc.width; i++) {
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for (int j = 0; j < imageSrc.height; j++) {
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if (imageSrc.getPixel(i, j) == 0xff000000) {
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Particle particle = Particle(
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x: i * 1.0+ offsetX,
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y: j * 1.0+ offsetY,
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vx: 4 * random.nextDouble() * pow(-1, random.nextInt(20)),
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vy: 4 * random.nextDouble() * pow(-1, random.nextInt(20)),
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ay: 0.1,
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size: 0.5,
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color: Colors.blue); //产生粒子---每个粒子拥有随机的一些属性信息
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pm.particles.add(particle);
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}
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}
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}
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pm.tick(run: false);
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}
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}
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