added isDefault to GridAxisDatas, painting `defaultDivisionInterval…

…` if data is default

CHANGELOG.md

@@ -1,5 +1,10 @@
 # Changelog
 
+## 6.2.1 - 19.08.2024
+
+* Changes of the `GridAxis` based charts (`LineChart`/`CandlestickChart`):
+  * Added extra condition (if data is default alongside with empty data) for painting `GridAxisSettings.defaultDivisionInterval`.
+
 ## 6.2.0 - 19.08.2024
 
 * Changes of the `GridAxis` based charts (`LineChart`/`CandlestickChart`):

lib/src/candlestick/data.dart

@@ -146,6 +146,10 @@ class CandlestickChartData extends GridAxisData<CandlestickData> {
   @override
   double minValuePredicate(CandlestickData value) => value.low;
 
+  @override
+  bool get isDefault =>
+      data.values.every((v) => v == const CandlestickData.zero());
+
   /// Creates a copy of the current object with new values specified in
   /// arguments.
   CandlestickChartData copyWith({

lib/src/common/chart.data.dart

@@ -67,6 +67,9 @@ abstract class ChartData<T> {
   /// It checks for [data] length to be greater than or equal to 1.
   bool get canDraw => data.isNotEmpty;
 
+  /// Checks whether every data entry is a default value ot not.
+  bool get isDefault;
+
   /// Checks whether every data entry is less than or equal to `0` and any of
   /// it strictly less than `0` or not.
   bool get isNegative =>

lib/src/common/gridaxis/painter.dart

@@ -97,7 +97,7 @@ class GridAxisPainter extends CustomPainter {
       }
 
       double labelValue;
-      if (data.data.isEmpty) {
+      if (data.data.isEmpty || data.isDefault) {
         labelValue =
             mult(math.max(settings.defaultDivisionInterval, 1), yEnd - i - 1);
       } else if (data.isNegative) {

lib/src/line/data.dart

@@ -66,6 +66,9 @@ class LineChartData extends GridAxisData<double> {
   @override
   double minValuePredicate(double value) => value;
 
+  @override
+  bool get isDefault => data.values.every((v) => v == 0);
+
   /// {@macro ChartData.maxValue}
   /// (Omitting [limit] value)
   ///