App_Flutter/lib/view/component/target_painter.dart

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

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

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

    Paint complete = Paint()
      // ..color = completeColor
      ..strokeCap = StrokeCap.round
      ..style = PaintingStyle.stroke
      ..strokeWidth = width;

    Offset center = Offset(size.width / 2, size.height / 2); //  坐标中心
    double radius = Global().progressWidth; //  半径
    double begin = beginAngle;

    if (begin>2*pi){
      begin -= 2*pi;
    }
    if (begin>pi){
      begin -= 2*pi;
    }

    if (arcAngle>2*pi && begin<0){
      arcAngle -= 2*pi;
    }

    if (begin>0 && arcAngle<begin){
      arcAngle += 2*pi;
    }

    if (arcAngle<-pi){
      arcAngle += 2*pi;
    }

    double end = arcAngle-begin;

    if (end>2*pi){
      end -= 2*pi;
    }
    
    // if (begin < 0 && end > 2 * pi + (pi / 2 + begin)) {
    //   end -= 2 * pi;
    // }

    complete.color = const Color(0x26C4CCDA);
    canvas.drawArc(Rect.fromCircle(center: center, radius: radius), begin, end,
        false, complete);

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

    //   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;
}