PreethikaSelvam
commented
3 months ago 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
@override
void initState() {
super.initState();
_bloc = CandleBloc();
_bloc.candleStream.listen((data) {
setState(() {
_chartData.addAll(data);
});
});}
@override
void dispose() {
_bloc.dispose();
super.dispose();}
@override
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
Stream<List
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
Bug description
I am currently facing a RangeError in candle chart. I think I am doing something wrong. but couldn't figure it out. I am using bloc to convert a stream of (double, DateTime) into a list of a custom wrapper class for open, close, high. low and time. And this error is encountered whenever a new candle is added to the chart. It goes away for a brief amount time and comes back after next candle insertion.
Steps to reproduce
.
Code sample
Code sample
```dart SfCartesianChart( plotAreaBorderWidth: 0, zoomPanBehavior: _zoomPanBehavior, onChartTouchInteractionMove: (ChartTouchInteractionArgs args) { isPointerMoved = true; }, onChartTouchInteractionUp: (ChartTouchInteractionArgs args) { isPointerMoved = false; }, margin: EdgeInsets.zero, primaryXAxis: DateTimeAxis( // visibleMinimum: visibleRange?.start, // visibleMaximum: visibleRange?.end, majorGridLines: const MajorGridLines(width: 0), edgeLabelPlacement: EdgeLabelPlacement.shift, onRendererCreated: (p0) { // print('onRendererCreated'); // _xAxisController = p0; // _xAxisController?.visibleMinimum = visibleRange?.start; // // _xAxisController?.visibleMaximum = visibleRange?.end; }, ), primaryYAxis: NumericAxis( minimum: minY, maximum: maxY, majorGridLines: const MajorGridLines(width: 0.5), labelFormat: '{value}', opposedPosition: true, axisLine: const AxisLine(width: 0), ), series: _getCandleSeries(), trackballBehavior: TrackballBehavior( enable: true, activationMode: ActivationMode.singleTap, ), ) ListScreenshots or Video
Screenshots / Video demonstration
[Upload media here]Stack Traces
Stack Traces
```dart [log] #0 List.[] (dart:core-patch/growable_array.dart:264:36) #1 CandleSegment.onPaint (package:syncfusion_flutter_charts/src/charts/series/candle_series.dart:480:35) #2 CartesianSeriesRenderer.paintSegments (package:syncfusion_flutter_charts/src/charts/series/chart_series.dart:4067:23) #3 CartesianSeriesRenderer.onPaint (package:syncfusion_flutter_charts/src/charts/series/chart_series.dart:4044:5) #4 ChartSeriesRenderer.paint (package:syncfusion_flutter_charts/src/charts/series/chart_series.dart:2409:5) #5 RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:3239:7) #6 PaintingContext.paintChild (package:flutter/src/rendering/object.dart:250:13) #7 RenderBoxContainerDefaultsMixin.defaultPaint (package:flutter/src/rendering/box.dart:3158:15) #8 RenderStack.paintStack (package:flutter/src/rendering/stack.dart:633:5) #9 RenderStack.paint (package:flutter/src/rendering/stack.dart:649:7) #10 RenderChartPlotArea.paint (package:syncfusion_flutter_charts/src/charts/base.dart:1211:11) #11 RenderCartesianChartPlotArea.paint (package:syncfusion_flutter_charts/src/charts/base.dart:1661:11) #12 RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:3239:7) #13 PaintingContext.paintChild (package:flutter/src/rendering/object.dart:250:13) #14 RenderBoxContainerDefaultsMixin.defaultPaint (package:flutter/src/rendering/box.dart:3158:15) #15 RenderCartesianChartArea.paint (package:syncfusion_flutter_charts/src/charts/base.dart:882:5) #16 RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:3239:7) #17 PaintingContext._repaintCompositedChild (package:flutter/src/rendering/object.dart:166:11) #18 PaintingContext.repaintCompositedChild (package:flutter/src/rendering/object.dart:109:5) #19 PipelineOwner.flushPaint (package:flutter/src/rendering/object.dart:1182:31) #20 PipelineOwner.flushPaint (package:flutter/src/rendering/object.dart:1192:15) #21 RendererBinding.drawFrame (package:flutter/src/rendering/binding.dart:579:23) #22 WidgetsBinding.drawFrame (package:flutter/src/widgets/binding.dart:1138:13) #23 RendererBinding._handlePersistentFrameCallback (package:flutter/src/rendering/binding.dart:443:5) #24 SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:1392:15) #25 SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:1313:9) #26 SchedulerBinding._handleDrawFrame (package:flutter/src/scheduler/binding.dart:1171:5) #27 _invoke (dart:ui/hooks.dart:312:13) #28 PlatformDispatcher._drawFrame (dart:ui/platform_dispatcher.dart:419:5) #29 _drawFrame (dart:ui/hooks.dart:283:31) ```On which target platforms have you observed this bug?
iOS
Flutter Doctor output
Doctor output
```console Doctor summary (to see all details, run flutter doctor -v): [✓] Flutter (Channel stable, 3.22.0, on macOS 14.4.1 23E224 darwin-arm64, locale en-IN) [✓] Android toolchain - develop for Android devices (Android SDK version 34.0.0) [✓] Xcode - develop for iOS and macOS (Xcode 15.4) [✗] Chrome - develop for the web (Cannot find Chrome executable at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome) ! Cannot find Chrome. Try setting CHROME_EXECUTABLE to a Chrome executable. [✓] Android Studio (version 2023.3) [✓] VS Code (version 1.89.1) [✓] Connected device (4 available) [✓] Network resources ! Doctor found issues in 1 category. ```