App_Flutter/lib/view/component/progress_painter.dart

import 'dart:math';

import 'package:fast/utils/global.dart';
import 'package:fast/utils/size_fit.dart';
import 'package:flutter/material.dart';
import 'dart:ui' as ui;

import '../../constants.dart';

class ProgressPainter extends CustomPainter {
  Color lineColor;
  Color completeColor;
  double arcAngle;
  double beginAngle;
  double width;
  ui.Image? localImage;

  ProgressPainter(
      {required this.lineColor,
      required this.completeColor,
      required this.arcAngle,
      required this.beginAngle,
      required this.width,
      required this.localImage});

  @override
  void paint(Canvas canvas, Size size) {
    if (arcAngle==0){
      return;
    }
    Offset center = Offset(size.width / 2, size.height / 2); //  坐标中心
    double radius = Global().progressWidth; //  半径
  
    Paint progress = Paint()
      ..strokeCap = StrokeCap.round
      ..style = PaintingStyle.stroke
      ..strokeWidth = width;
    
    var step = 0.171;
    var maxEnd = arcAngle;
    if (maxEnd>2*pi-step){
      maxEnd = 2*pi-2*step;
    }
    progress.shader = ui.Gradient.sweep(center, [const Color(0x33AAFF00), kThemeColor],[0,1],ui.TileMode.clamp,step,maxEnd+step,null);
    canvas.drawArc(Rect.fromCircle(center: center, radius: radius), step, maxEnd,
        false, progress);

    // Paint line = Paint()
    //   ..color = lineColor
    //   ..strokeCap = StrokeCap.round
    //   ..style = PaintingStyle.stroke
    //   ..strokeWidth = width + 8;


    // if (localImage != null) {
    //   double startLeft = center.dx + radius * cos(maxEnd+step);
    //   double startTop = center.dy + radius * sin(maxEnd+step);

    //   double? width = localImage?.width.toDouble();
    //   double? height = localImage?.height.toDouble();
    //   canvas.drawImageRect(
    //       localImage!,
    //       Rect.fromLTWH(0, 0, width!, height!),
    //       Rect.fromLTWH(startLeft - (width / 6).px, startTop - (height / 6).px,
    //           (width / 3).px, (height / 3).px),
    //       line);
    // }
  }


  void setCanvasImageData(Canvas canvas) {}

  @override
  bool shouldRepaint(CustomPainter oldDelegate) => true;
}