import 'dart:math';
import 'dart:ui';

import 'package:flutter/material.dart';

import '../components/coordinate.dart';

/// create by 张风捷特烈 on 2020/5/1
/// contact me by email 1981462002@qq.com
/// 说明:

class Paper extends StatelessWidget {
  const Paper({super.key});

  @override
  Widget build(BuildContext context) {
    return Container(
      color: Colors.white,
      child: CustomPaint(
        // 使用CustomPaint
        painter: PaperPainter(),
      ),
    );
  }
}

class PaperPainter extends CustomPainter {
  final Coordinate coordinate = Coordinate();

  @override
  void paint(Canvas canvas, Size size) {
    coordinate.paint(canvas, size);
    canvas.translate(size.width / 2, size.height / 2);

    Path path = Path();
    Paint paint = Paint()
      ..color = Colors.purpleAccent
      ..strokeWidth = 2
      ..style = PaintingStyle.stroke;

    Rect rect = Rect.fromPoints(Offset(100, 100), Offset(160, 140));
    path
      ..lineTo(100, 100)
      ..addOval(rect)
      ..relativeLineTo(100, -100)
      ..addArc(rect.translate(100 + 60.0, -100), 0, pi);
    canvas.drawPath(path, paint);
  }

  @override
  bool shouldRepaint(CustomPainter oldDelegate) => false;
}
