mobileCyberGamesApp/lib/widget/CircleProgressBarPainter.dart

import 'package:flutter/material.dart';


class CircleProgressBarPainter extends CustomPainter {
  var _paintBckGround;
  var _paintFore;

  final _strokeWidth;
  final _backgroundColor;
  final _foreColor;
  final _startAngle;
  final _sweepAngle;
  final _endAngle;

  CircleProgressBarPainter(this._backgroundColor, this._foreColor,
      this._startAngle, this._sweepAngle, this._endAngle, this._strokeWidth) {
    _paintBckGround = Paint()
      ..color = _backgroundColor
      ..isAntiAlias = true
      ..strokeCap = StrokeCap.round
      ..strokeWidth = _strokeWidth
      ..style = PaintingStyle.stroke;

      final Gradient gradient = SweepGradient(
          endAngle: _endAngle,
          colors: [
            _foreColor,
            _backgroundColor,
            
          ],
        );

        final Rect arcRect = Rect.fromCircle(center:  Offset(0, 0), radius: _endAngle);

    _paintFore = Paint()
      ..color = _foreColor
      ..isAntiAlias = true
      ..strokeWidth = _strokeWidth
      ..strokeCap = StrokeCap.round
      ..shader=gradient.createShader(arcRect)
      ..style = PaintingStyle.stroke;
  }

  @override
  void paint(Canvas canvas, Size size) {
    var radius = size.width > size.height ? size.width / 2 : size.height / 2;
    Rect rect = Rect.fromCircle(center: Offset(radius, radius), radius: radius);

    canvas.drawCircle(Offset(radius, radius), radius, _paintBckGround);
    canvas.drawArc(rect, _startAngle / 180 * 3.14, _sweepAngle / 180 * 3.14,
        false, _paintFore);
  }

  @override
  bool shouldRepaint(CustomPainter oldDelegate) {
    return _sweepAngle != _endAngle;
  }
}