Add angle property in the HorizontalLineLabel and VerticalLineLabel…

… classes to make it possible to rotate the labels in degrees, #1261

CHANGELOG.md

@@ -1,5 +1,6 @@
 ## nextVersion
-* **FEATURE** (by @Dartek12): Added gradient to [FlLine](https://github.com/imaNNeo/fl_chart/blob/master/repo_files/documentations/base_chart.md#FlLine) 
+* **FEATURE** (by @Dartek12): Added gradient to [FlLine](https://github.com/imaNNeo/fl_chart/blob/master/repo_files/documentations/base_chart.md#FlLine)
+* **FEATURE** (by @imaNNeo) Add `angle` property in the [HorizontalLineLabel](https://github.com/imaNNeo/fl_chart/blob/master/repo_files/documentations/base_chart.md#horizontallinelabel) and [VerticalLineLabel](https://github.com/imaNNeo/fl_chart/blob/master/repo_files/documentations/base_chart.md#verticallinelabel) classes to make it possible to rotate the labels in degrees, #1261
 
 ## 0.64.0
 * **BUGFIX** (by @Anas35) Fix Tooltip not displaying when value from BackgroundBarChartRodData is less than zero. #1345.

lib/src/chart/base/axis_chart/axis_chart_data.dart

@@ -1124,13 +1124,14 @@ class HorizontalLineLabel extends FlLineLabel with EquatableMixin {
   /// size, ... of the text.
   /// Drawing text will retrieve through [labelResolver],
   /// you can override it with your custom data.
-  /// /// [show] determines showing label or not.
+  /// [show] determines showing label or not.
   HorizontalLineLabel({
     EdgeInsets? padding,
     super.style,
     Alignment? alignment,
     super.show = false,
     String Function(HorizontalLine)? labelResolver,
+    super.angle = 0.0,
   })  : labelResolver =
             labelResolver ?? HorizontalLineLabel.defaultLineLabelResolver,
         super(
@@ -1158,6 +1159,7 @@ class HorizontalLineLabel extends FlLineLabel with EquatableMixin {
       alignment: Alignment.lerp(a.alignment, b.alignment, t),
       labelResolver: b.labelResolver,
       show: b.show,
+      angle: lerpDouble(a.angle, b.angle, t)!,
     );
   }
 
@@ -1169,6 +1171,7 @@ class HorizontalLineLabel extends FlLineLabel with EquatableMixin {
         padding,
         style,
         alignment,
+        angle,
       ];
 }
 
@@ -1186,6 +1189,7 @@ class VerticalLineLabel extends FlLineLabel with EquatableMixin {
     Alignment? alignment,
     bool? show,
     String Function(VerticalLine)? labelResolver,
+    super.angle = 0.0,
   })  : labelResolver =
             labelResolver ?? VerticalLineLabel.defaultLineLabelResolver,
         super(
@@ -1220,6 +1224,7 @@ class VerticalLineLabel extends FlLineLabel with EquatableMixin {
       alignment: Alignment.lerp(a.alignment, b.alignment, t),
       labelResolver: b.labelResolver,
       show: b.show,
+      angle: lerpDouble(a.angle, b.angle, t)!,
     );
   }
 
@@ -1231,6 +1236,7 @@ class VerticalLineLabel extends FlLineLabel with EquatableMixin {
         padding,
         style,
         alignment,
+        angle,
       ];
 }
 

lib/src/chart/base/axis_chart/axis_chart_painter.dart

@@ -315,6 +315,7 @@ abstract class AxisChartPainter<D extends AxisChartData>
                 to.dy + padding.top,
               ),
             ),
+            label.angle,
           );
         }
       }
@@ -408,6 +409,7 @@ abstract class AxisChartPainter<D extends AxisChartData>
                 to.dy - padding.bottom,
               ),
             ),
+            label.angle,
           );
         }
       }

lib/src/chart/line_chart/line_chart_data.dart

@@ -1017,6 +1017,7 @@ abstract class FlLineLabel with EquatableMixin {
     required this.padding,
     required this.style,
     required this.alignment,
+    this.angle = 0,
   });
 
   /// Determines showing label or not.
@@ -1031,13 +1032,17 @@ abstract class FlLineLabel with EquatableMixin {
   /// Aligns the text on the line.
   final Alignment alignment;
 
+  /// [angle] is used to rotate the label (in degrees)
+  final double angle;
+
   /// Used for equality check, see [EquatableMixin].
   @override
   List<Object?> get props => [
         show,
         padding,
         style,
         alignment,
+        angle,
       ];
 }
 

repo_files/documentations/base_chart.md

@@ -167,6 +167,7 @@ Base class for all supported touch/pointer events.
 |style|[TextStyle](https://api.flutter.dev/flutter/dart-ui/TextStyle-class.html) which determines label text style|TextStyle(fontSize: 11, color: line.color)|
 |alignment|[Alignment](https://api.flutter.dev/flutter/painting/Alignment-class.html) with label position relative to line|Alignment.topLeft|
 |labelResolver|Getter function returning label title|defaultLineLabelResolver|
+|angle|Angle of the label in degrees|0|
 
 ### VerticalLineLabel
 |PropName|Description|default value|
@@ -176,6 +177,7 @@ Base class for all supported touch/pointer events.
 |style|[TextStyle](https://api.flutter.dev/flutter/dart-ui/TextStyle-class.html) which determines label text style|TextStyle(fontSize: 11, color: line.color)|
 |alignment|[Alignment](https://api.flutter.dev/flutter/painting/Alignment-class.html) with label position relative to line|Alignment.topLeft|
 |labelResolver|Getter function returning label title|defaultLineLabelResolver|
+|angle|Angle of the label in degrees|0|
 
 ### FLHorizontalAlignment
 enum values {`center`, `left`, `right`}