RingPainter constructor
      
      RingPainter({})
     
    
    
Implementation
RingPainter({
  required this.paintWidth,
  this.progressPercent,
  this.startAngle,
  required this.trackColor,
}) : trackPaint = Paint()
        ..color = trackColor
        ..style = PaintingStyle.stroke
        ..strokeWidth = paintWidth
        ..strokeCap = StrokeCap.square;