ArcPainter with overriden paint method.

ArcPainter2.dart

class ArcPainter extends CustomPainter {
  ArcPainter({
    this.strokeWidth,
    this.backgroundColor,
    this.valueColor,
    this.headValue,
    this.tailValue,
    this.stepValue,
    this.rotationValue
  })
  
  // ...
  
  @override
  void paint(Canvas canvas, Size size) {
    // ...
  }
}