Demo of Oscilloscope using Stream Data

main.dart

/// Demo of using the oscilloscope package
/// This uses the output from the Acceleromter on a device 

import 'package:flutter/material.dart';
import 'package:oscilloscope/oscilloscope.dart';
import 'package:sensors/sensors.dart';


void main() => runApp(new MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return new MaterialApp(
      title: "Oscilloscope Display Example",
      home: Shell(),
    );
  }
}

class Shell extends StatefulWidget {
  @override
  _ShellState createState() => _ShellState();
}

class _ShellState extends State<Shell> {
  List<double> traceX = List();
 
  @override
  initState() {
    super.initState();
    accelerometerEvents.listen( (AccelerometerEvent event){
      setState(() {
        traceX.add(event.x);              
      });
    });
  }

  @override
  void dispose() {
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    // Create A Scope Display
    Oscilloscope scopeOne = Oscilloscope(
      padding: 20.0,
      backgroundColor: Colors.black,
      traceColor: Colors.green,
      yAxisMax: 10.0,
      yAxisMin: -10.0,
      dataSet: traceX,
    );

 
    // Generate the Scaffold
    return Scaffold(
      appBar: AppBar(
        title: Text("OscilloScope Demo"),
      ),
      body: Column(
        children: <Widget>[
          Expanded(flex: 1, child: scopeOne),
        ],
      ),
    );
  }
}

lib/main.dart:27:36: Error: Too few positional arguments: 2 required, 0 given.
List traceX = List.filled();
^
org-dartlang-sdk:///third_party/dart/sdk/lib/_internal/vm/lib/array_patch.dart:19:11: Context: Found this candidate, but the arguments don't match.
factory List.filled(int length, E fill, {bool growable: false}) {
^^^^^^

Thats is because the gist is now 3 years old and the code is correct for the version of Dart/Flutter it was written again. The Dart language has advanced a great deal since then, null safety etc.

Looks like the list.filled() now needs params specified - see https://api.dart.dev/stable/2.13.4/dart-core/List/List.filled.html
Alternatively you could probably just init like this

List traceX = [];

Thats is because the gist is now 3 years old and the code is correct for the version of Dart/Flutter it was written again. The Dart language has advanced a great deal since then, null safety etc.

Looks like the list.filled() now needs params specified - see https://api.dart.dev/stable/2.13.4/dart-core/List/List.filled.html
Alternatively you could probably just init like this

List traceX = [];

The problem was solved! Thank you.

hi i have test code but i think slowl not real time . How to speed up to real time.