real_time_chart/example/lib/main.dart

import 'dart:math';

import 'package:flutter/material.dart';
import 'package:real_time_chart/real_time_chart.dart';

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

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

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: const MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

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

  final String title;

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

class _MyHomePageState extends State<MyHomePage> {
  @override
  Widget build(BuildContext context) {
    final stream = getDataStream().asBroadcastStream();

    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: SizedBox(
        width: double.maxFinite,
        child: Column(
          children: [
            Expanded(
              child: Padding(
                padding: const EdgeInsets.all(16.0),
                child: RealTimeGraph(
                  stream: stream,
                ),
              ),
            ),
            const SizedBox(height: 32),
            Expanded(
              child: Padding(
                padding: const EdgeInsets.all(16.0),
                child: RealTimeGraph(
                  stream: stream,
                  displayMode: ChartDisplay.points,
                ),
              ),
            ),
          ],
        ),
      ),
    );
  }

  int count = 0;
  bool up = true;

  Stream<double> getDataStream() {
    return Stream.periodic(const Duration(milliseconds: 500), (_) {
      return Random().nextInt(500).toDouble();
    });
  }
}