Add a parameter to allow customising radial track labels

README.md

@@ -167,6 +167,12 @@ Default **`endAngle`**`: 210°
 
 <p align='center'><img src="https://raw.githubusercontent.com/GeekyAnts/GaugesFlutter/main/example/screens/radial-angles.png" alt="radial-angels"  height=440></p>
 
+#### Custom Track Labels
+
+The labels displayed on the RadialGauge track can easily be formated to your need.
+
+<p align='center'><img src="example/screens/radial-custom-track-label.png" alt="radial-gauge-custom-track-label"  height=440></p>
+
 #### **Radii Customization**
 
 `radiusFactor` can be used to size the adjust the scaling factor of the radius and change the radius of the gauge accordingly.

example/lib/radial_gauge_custom_label.dart

@@ -0,0 +1,32 @@
+import 'package:flutter/material.dart';
+import 'package:geekyants_flutter_gauges/geekyants_flutter_gauges.dart';
+
+///
+/// The following code  is a Simple Example of [RadialGauge] Widget with custom track labels.
+///
+class RadialGaugeCustomLabel extends StatefulWidget {
+  const RadialGaugeCustomLabel({super.key});
+
+  @override
+  State<RadialGaugeCustomLabel> createState() => _RadialGaugeCustomLabelState();
+}
+
+class _RadialGaugeCustomLabelState extends State<RadialGaugeCustomLabel> {
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      backgroundColor: Colors.white,
+      body: RadialGauge(
+        track: RadialTrack(
+            color: Colors.grey,
+            start: 0,
+            end: 100,
+            mapTrackLabel: (double value) => "${value.round()}€",
+            trackStyle: const TrackStyle(
+              showFirstLabel: false,
+              showLastLabel: false,
+            )),
+      ),
+    );
+  }
+}

lib/src/radial_gauge/radial_gauge_container_painter.dart

@@ -54,6 +54,9 @@ class RenderRadialGaugeContainer extends RenderBox {
       ..strokeWidth = getRadialGauge.track.trackStyle.secondaryRulersWidth!
       ..style = PaintingStyle.stroke;
 
+    final mapTrackLabel = getRadialGauge.track.mapTrackLabel ??
+        (double value) => value.toString();
+
     // Loop to draw the Rulers and Labels
     for (int i = 0; i <= numParts; i++) {
       double rulerOffset = getRadialGauge.track.trackStyle.rulersOffset ?? 0;
@@ -130,7 +133,7 @@ class RenderRadialGaugeContainer extends RenderBox {
           start + double.parse(((l / range) * valueRange).toStringAsFixed(2));
       Color textColor = Colors.black;
       textPainter.text = TextSpan(
-          text: exactValue.toString(),
+          text: mapTrackLabel(exactValue),
           style: getRadialGauge.track.trackStyle.labelStyle ??
               TextStyle(color: textColor, fontWeight: FontWeight.bold));
       textPainter.layout();

lib/src/radial_gauge/radial_track.dart

@@ -63,6 +63,7 @@ class RadialTrack {
       secondaryRulerPerInterval: 4.0,
     ),
     this.gradient,
+    this.mapTrackLabel,
   });
 
   ///
@@ -121,6 +122,21 @@ class RadialTrack {
   /// The [trackStyle] property is used to customize the track of the Radial Gauge.
   ///
   final TrackStyle trackStyle;
+
+  ///
+  /// The [mapTrackLabel] property is used to customize the track labels of the Radial Gauge.
+  ///
+  /// ``` dart
+  /// RadialGauge(
+  ///          track: RadialTrack(
+  ///            start: 0,
+  ///            end: 100,
+  ///            mapTrackLabel: (double value) => "${value.round()}€",
+  ///         ),
+  ///     ),
+  /// ```
+  ///
+  final String Function(double)? mapTrackLabel;
 }
 
 class TrackStyle extends BaseRulerStyle {