flutter_trading_chart

Description:

flutter trading chart

flutter_trading_chart #
Flutter package to display trading charts.
It includes tools to draw indicators, customization parameters and panning and zooming abilities on the time axis.
Volume and Volume profile are already built-in.

Getting Started #
Install #
dependencies:
flutter_trading_chart: ^0.0.1
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or use
flutter pub add flutter_trading_chart
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Usage #
import 'dart:math';

import 'package:collection/collection.dart';
import 'package:flutter/material.dart';
import 'package:flutter_trading_chart/flutter_trading_chart.dart';

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

class MyApp extends StatelessWidget {
const MyApp({Key? key}) : super(key: key);

@override
Widget build(BuildContext context) {
return const MaterialApp(
home: ExempleTradingChart(),
);
}
}

class ExempleTradingChart extends StatefulWidget {
const ExempleTradingChart({Key? key}) : super(key: key);

@override
_ExempleTradingChartState createState() => _ExempleTradingChartState();
}

class _ExempleTradingChartState extends State<ExempleTradingChart> {
TradingChartController controller = TradingChartController(
settings: TradingChartSettings(
volume: VolumeSettings(
visible: true,
),
vpvr: VpvrSettings(
visible: true,
),
),
);
@override
void initState() {
super.initState();
setCandleSerie();
}

@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: const Text("TRADING CHART EXEMPLE"),
),
body: TradingChart(
controller: controller,
),
);
}

CandlestickSerie generateCandleStickSerie() {
var rng = Random();
double open = 50000;
int timestamp = 1621184400000;
double volume = 1000;
List<Candlestick> candles = [];
for (int i = 0; i < 100; ++i) {
double close = open * (1 + (rng.nextInt(11) - 4.5) / 100);
double high = max(close, open) * (1 + rng.nextInt(2) / 100);
double low = min(close, open) * (1 - rng.nextInt(2) / 100);
volume = volume * (1 + (rng.nextInt(11) - 4.8) / 100);
candles.add(Candlestick(
timestamp: timestamp + i * 300000,
open: open,
high: high,
low: low,
close: close,
volume: volume,
));
open = close;
}
return CandlestickSerie(
name: "Price",
candles: candles,
);
}

void setCandleSerie() {
controller.data.candleSerie = generateCandleStickSerie();
List<Point> movingAveragePoints = [];
for (int i = 8; i < controller.data.candleSerie!.candles.length; ++i) {
final sublist = controller.data.candleSerie!.candles.sublist(i - 8, i + 1).map((e) => e.close).toList();
movingAveragePoints.add(Point(
timestamp: controller.data.candleSerie!.candles[i].timestamp,
y: sublist.average,
));
}
controller.data.lineSeries.add(LineSerie(
name: "Moving Average",
color: Colors.yellow,
points: movingAveragePoints,
));
controller.setTimestamps(
controller.data.candleSerie!.candles.first.timestamp,
controller.data.candleSerie!.candles.last.timestamp,
);
}
}
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