import 'package:flutter/material.dart';

void main() {
  runApp(const MyApp());
}

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

  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        // This is the theme of your application.
        //
        // TRY THIS: Try running your application with "flutter run". You'll see
        // the application has a purple toolbar. Then, without quitting the app,
        // try changing the seedColor in the colorScheme below to Colors.green
        // and then invoke "hot reload" (save your changes or press the "hot
        // reload" button in a Flutter-supported IDE, or press "r" if you used
        // the command line to start the app).
        //
        // Notice that the counter didn't reset back to zero; the application
        // state is not lost during the reload. To reset the state, use hot
        // restart instead.
        //
        // This works for code too, not just values: Most code changes can be
        // tested with just a hot reload.
        colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
        useMaterial3: true,
      ),
      home: const MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({super.key, required this.title});

  // This widget is the home page of your application. It is stateful, meaning
  // that it has a State object (defined below) that contains fields that affect
  // how it looks.

  // This class is the configuration for the state. It holds the values (in this
  // case the title) provided by the parent (in this case the App widget) and
  // used by the build method of the State. Fields in a Widget subclass are
  // always marked "final".

  final String title;

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;

  void _incrementCounter() {
    setState(() {
      // This call to setState tells the Flutter framework that something has
      // changed in this State, which causes it to rerun the build method below
      // so that the display can reflect the updated values. If we changed
      // _counter without calling setState(), then the build method would not be
      // called again, and so nothing would appear to happen.
      _counter++;
    });
  }

  @override
  Widget build(BuildContext context) {
    // This method is rerun every time setState is called, for instance as done
    // by the _incrementCounter method above.
    //
    // The Flutter framework has been optimized to make rerunning build methods
    // fast, so that you can just rebuild anything that needs updating rather
    // than having to individually change instances of widgets.
    return Scaffold(
      appBar: AppBar(
        // TRY THIS: Try changing the color here to a specific color (to
        // Colors.amber, perhaps?) and trigger a hot reload to see the AppBar
        // change color while the other colors stay the same.
        backgroundColor: Theme.of(context).colorScheme.inversePrimary,
        // Here we take the value from the MyHomePage object that was created by
        // the App.build method, and use it to set our appbar title.
        title: Text(widget.title),
      ),
      body: Center(
        // Center is a layout widget. It takes a single child and positions it
        // in the middle of the parent.
        child: CustomPaint(
          size: Size(300, 300),
          painter: CoordinatePainter(
            points: [
              Offset(0, 0),
              Offset(40, 50),
              Offset(60, 90),
              Offset(60, 90),
            ],
          ),
        ),
      ),
    );
  }
}

class CoordinatePainter extends CustomPainter {
  final List<Offset> points;

  CoordinatePainter({required this.points});

  @override
  void paint(Canvas canvas, Size size) {
    final paint = Paint()
      ..color = Colors.black
      ..strokeWidth = 2;

    canvas.drawLine(
      Offset(0, size.height / 2),
      Offset(size.width, size.height / 2),
      paint,
    );

    canvas.drawLine(
      Offset(size.width / 2, 0),
      Offset(size.width / 2, size.height),
      paint,
    );

    if (points.isNotEmpty) {
      final _pathPaint = Paint()
        ..color = Color(0xFF0D5CDF).withOpacity(0.5)
        ..strokeWidth = 0.75
        ..strokeCap = StrokeCap.round
        ..strokeJoin = StrokeJoin.round
        ..style = PaintingStyle.stroke;
      final _cleanAreaPaint = Paint()
        ..color = Color(0xFF0D5CDF).withOpacity(0.1)
        ..strokeWidth = 6.4
        ..strokeCap = StrokeCap.round
        ..strokeJoin = StrokeJoin.round
        ..style = PaintingStyle.stroke;

      final center = Offset(size.width / 2, size.height / 2);

      final path = Path();

      for (int i = 0; i < points.length; i++) {
        final point = center + points[i];

        if (i == 0) {
          path.moveTo(point.dx, point.dy);
        } else if (i == 2) {
          path.moveTo(point.dx, point.dy);
        } else {
          path.lineTo(point.dx, point.dy);
        }
      }

      canvas.drawPath(path, _cleanAreaPaint);
      canvas.drawPath(path, _pathPaint);
    }
  }

  @override
  bool shouldRepaint(covariant CustomPainter oldDelegate) {
    return false;
  }
}