Offset argument contained a NaN value

[papakay]

Hi, I want to really commend the great work done so far with this library.

I experience the error above when i have data rows as below

_chartData.dataRows = [
      [0.0, 0.0, 0.0, 0.0, 0.0],
      [0.0, 0.0, 0.0, 0.0, 0.0],
      [0.0, 0.0, 0.0, 0.0, 0.0],
      [0.0, 0.0, 0.0, 0.0, 0.0],
    ];

Part of the error message:

flutter: ══╡ EXCEPTION CAUGHT BY RENDERING LIBRARY ╞═════════════════════════════════════════════════════════
flutter: The following assertion was thrown during paint():
flutter: Offset argument contained a NaN value.
flutter: 'dart:ui/painting.dart': Failed assertion: line 38: '<optimized out>'
flutter:
flutter: Either the assertion indicates an error in the framework itself, or we should provide substantially
flutter: more information in this error message to help you determine and fix the underlying cause.
flutter: In either case, please report this assertion by filing a bug on GitHub:
flutter:   https://github.com/flutter/flutter/issues/new?template=BUG.md
flutter:
flutter: When the exception was thrown, this was the stack:
flutter: #2      _offsetIsValid (dart:ui/painting.dart:38:10)
flutter: #3      Canvas.drawLine (dart:ui/painting.dart:3146:12)
flutter: #4      LineContainer.paint (package:flutter_charts/src/chart/line_container.dart:20:12)
flutter: #5      GridLinesContainer.paint.<anonymous closure> (package:flutter_charts/src/chart/container.dart:1094:62)
flutter: #6      List.forEach (dart:core/runtime/libgrowable_array.dart:277:8)
flutter: #7      GridLinesContainer.paint (package:flutter_charts/src/chart/container.dart:1094:21)
flutter: #8      DataContainer.paint (package:flutter_charts/src/chart/container.dart:1028:31)
flutter: #9      ChartPainter.drawGrid (package:flutter_charts/src/chart/painter.dart:76:29)
flutter: #10     ChartPainter.paint (package:flutter_charts/src/chart/painter.dart:55:5)
flutter: #11     RenderCustomPaint._paintWithPainter (package:flutter/src/rendering/custom_paint.dart:521:13)
flutter: #12     RenderCustomPaint.paint (package:flutter/src/rendering/custom_paint.dart:559:7)
flutter: #13     RenderObject._paintWithContext

[ruan65]

mee too

[mzimmerm]

@papakay : Thanks very much for reporting this, and my appologies for the delay. If still relevant: This "all zeros issue" is now fixed in the latest version 0.3.1. Please take a look at

https://pub.dev/packages/flutter_charts/changelog

An example that failed before the change and is now fixed can be seen in

https://github.com/mzimmerm/flutter_charts/blob/master/example1/lib/main.dart

around

      case ExamplesEnum.ex900ErrorFixUserDataAllZero:
        /// Currently, setting [ChartDate.dataRows] requires to also set all of 
        /// [chartData.xLabels], [chartData.dataRowsLegends], [chartData.dataRowsColors]
        // Fix was: Add default legend to ChartData constructor AND fix scaling util_dart.dart scaleValue.
        chartData = ChartData();
        chartData.dataRows = [
          [0.0, 0.0, 0.0],
        ];
        // Note: When ChartData is defined, 
        //       ALL OF  chartData.xLabels,  chartData.dataRowsLegends, chartData.dataRowsColors
        //       must be set by client
        chartData.xLabels = ['Wolf', 'Deer', 'Mouse'];
        chartData.dataRowsLegends = [
          'Row 1',
        ];
        chartData.dataRowsColors = [
          Colors.blue,
        ];

[mzimmerm]

@papakay Thanks again for reporting this issue. As this is now working (as of 0.3.1) I will go ahead and close this item.

[papakay]

Thanks a lot @mzimmerm for the great work!