Show proper error message when there is less than 3 RadarEntry in Rad…

…arChart, #694
imaNNeo · Jul 15, 2021 · b70b4f9 · b70b4f9
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -1,3 +1,6 @@
+## newVersion
+* **IMPROVEMENT** Show proper error message when there is less than 3 [RadarEntry](https://github.com/imaNNeoFighT/fl_chart/blob/master/repo_files/documentations/radar_chart.md#radarentry) in [RadarChart](https://github.com/imaNNeoFighT/fl_chart/blob/master/repo_files/documentations/radar_chart.md), #694.
+
 ## 0.36.2
 * **IMPROVEMENT** Support `onMouseExit` event in all charts.
 * **IMPROVEMENT** Add `rotateAngle` property in [LineTouchTooltipData](https://github.com/imaNNeoFighT/fl_chart/blob/master/repo_files/documentations/line_chart.md#linetouchtooltipdata), [BarTouchTooltipData](https://github.com/imaNNeoFighT/fl_chart/blob/master/repo_files/documentations/bar_chart.md#bartouchtooltipdata), [ScatterTouchTooltipData](https://github.com/imaNNeoFighT/fl_chart/blob/master/repo_files/documentations/scatter_chart.md#scattertouchtooltipdata), #260, #679.

diff --git a/lib/src/chart/radar_chart/radar_chart_data.dart b/lib/src/chart/radar_chart/radar_chart_data.dart
@@ -260,7 +260,11 @@ class RadarDataSet with EquatableMixin {
     Color? borderColor,
     double? borderWidth,
     double? entryRadius,
-  })  : dataEntries = dataEntries ?? const [],
+  })  : assert(
+          dataEntries == null || dataEntries.length == 0 || dataEntries.length >= 3,
+          'Radar needs at least 3 RadarEntry',
+        ),
+        dataEntries = dataEntries ?? const [],
         fillColor = fillColor ?? Colors.black12,
         borderColor = borderColor ?? Colors.blueAccent,
         borderWidth = borderWidth ?? 2.0,