Comments (2)
PreethikaSelvam
commented on July 17, 2024
Hi @bilalep,
We have analyzed your query and found that the reported issue occurs only when we use the bloc to convert a stream, replacing the first data points with the new data. This issue is scheduled to be fixed in our upcoming weekly release which is scheduled on June 25, 2024. We will update you here once the release is rolled out and we appreciate your patience until then.
Additionally, if your requirement is to add new data to the end of the pervious data using bloc to convert a stream, we suggest the below code snippets and sample to achieve your requirement.
Code Snippet:
`
late CandleBloc _bloc;
List _chartData = [];
void initState() {
super.initState();
_bloc = CandleBloc();
_bloc.candleStream.listen((data) {
setState(() {
_chartData.addAll(data);
});
});
}
void dispose() {
_bloc.dispose();
super.dispose();
}
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('Candle Chart Demo'),
),
body: Center(
child: _chartData.isNotEmpty
? Padding(
padding: const EdgeInsets.all(8.0),
child: SizedBox(
height: 300,
child: SfCartesianChart(
primaryXAxis: DateTimeAxis(),
primaryYAxis: NumericAxis(),
series: _getCandleSeries(_chartData),
),
),
)
: CircularProgressIndicator(),
),
);
}
List<CandleSeries<CandleChartData, DateTime>> _getCandleSeries(
List<CandleChartData> data) {
return <CandleSeries<CandleChartData, DateTime>>[
CandleSeries<CandleChartData, DateTime>(
dataSource: data,
xValueMapper: (CandleChartData sales, _) => sales.timestamp,
lowValueMapper: (CandleChartData sales, _) => sales.low,
highValueMapper: (CandleChartData sales, _) => sales.high,
openValueMapper: (CandleChartData sales, _) => sales.open,
closeValueMapper: (CandleChartData sales, _) => sales.close,
),
];
}
}
class CandleBloc {
final _candleController = StreamController<List>.broadcast();
Stream<List> get candleStream => _candleController.stream;
CandleBloc() {
_startGeneratingData();
}
void _startGeneratingData() {
Timer.periodic(Duration(seconds: 1), (timer) {
final candle = CandleChartData(
open: 20 + Random().nextInt(10).toDouble(),
close: 20 + Random().nextInt(10).toDouble(),
high: 20 + Random().nextInt(10).toDouble(),
low: 20 + Random().nextInt(10).toDouble(),
timestamp: DateTime.now(),
);
_addCandle(candle);
});
}
void _addCandle(CandleChartData candle) {
_candleController.sink.add([candle]);
}
void dispose() {
_candleController.close();
}
}
`
Please let us know if you need any further assistance.
Regards,
Preethika Selvam.
gh1916.zip
from flutter-widgets.
PreethikaSelvam
commented on July 17, 2024
Hi @bilalep,
We have fixed the range exception that occurs when using the bloc to convert a stream for replacing the first data points with the new data points. This fix has been included in the latest version below. Therefore, we kindly request that you upgrade the syncfusion_flutter_charts package to the latest version below to avoid this issue.
Version: https://pub.dev/packages/syncfusion_flutter_charts/versions/26.1.39
Root cause: Missed to consider the candle line rendering when the candle series, open and close values are the same.
Regards,
Preethika Selvam.
from flutter-widgets.
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