111 lines
2.6 KiB
Dart
111 lines
2.6 KiB
Dart
import 'dart:async';
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import 'package:flutter/cupertino.dart';
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import 'package:flutter/material.dart';
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import 'package:flutter/services.dart';
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import 'package:image/image.dart' as image;
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import '../components/coordinate_pro.dart';
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/// create by 张风捷特烈 on 2020-03-19
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/// contact me by email 1981462002@qq.com
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/// 说明: 纸
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class Paper extends StatefulWidget {
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const Paper({super.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> {
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image.Image? _image;
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List<Ball> balls = [];
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double d = 20; //复刻的像素边长
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@override
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void initState() {
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super.initState();
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_initBalls();
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}
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void _initBalls() async {
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_image = await loadImageFromAssets('assets/images/icon_head.png');
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if (_image == null) return;
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for (int i = 0; i < _image!.width; i++) {
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for (int j = 0; j < _image!.height; j++) {
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Ball ball = Ball();
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ball.x = i * d + d / 2;
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ball.y = j * d + d / 2;
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ball.r = d / 2;
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image.Pixel pixel = _image!.getPixel(i, j);
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var color = Color.fromARGB(pixel.a.toInt(),pixel.r.toInt(),pixel.g.toInt(),pixel.b.toInt());
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ball.color = color;
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balls.add(ball);
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}
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}
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setState(() {});
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}
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@override
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Widget build(BuildContext context) {
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return Container(
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color: Colors.white,
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child: CustomPaint(
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painter: PaperPainter(balls),
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));
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}
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//读取 assets 中的图片
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Future<image.Image?> loadImageFromAssets(String path) async {
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ByteData data = await rootBundle.load(path);
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List<int> bytes = data.buffer.asUint8List();
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return image.decodeImage(Uint8List.fromList(bytes));
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}
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}
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class PaperPainter extends CustomPainter {
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late Paint _paint;
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final double strokeWidth = 0.5;
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final Color color = Colors.blue;
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final List<Ball> balls;
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final Coordinate coordinate = Coordinate();
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PaperPainter(this.balls) {
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_paint = Paint()
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..style = PaintingStyle.fill
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..strokeWidth = strokeWidth
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..color = color;
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}
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@override
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void paint(Canvas canvas, Size size) {
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coordinate.paint(canvas, size);
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canvas.translate(-710, -1000);
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_drawImage(canvas);
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}
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void _drawImage(Canvas canvas) {
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balls.forEach((Ball ball) {
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canvas.drawCircle(
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Offset(ball.x, ball.y), ball.r, _paint..color = ball.color);
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});
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}
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@override
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bool shouldRepaint(PaperPainter oldDelegate) => true;
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}
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class Ball {
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double x; //点位X
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double y; //点位Y
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Color color; //颜色
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double r; // 半径
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Ball({this.x=0, this.y=0, this.color=Colors.black, this.r=5});
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}
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