如何在给定的分钟内以编程方式更新CircularPercentIndicator的进度颜色？

import 'package:flutter/material.dart';
import 'package:percent_indicator/percent_indicator.dart';

class ProgressColorScreen extends StatefulWidget {
  @override
  _ProgressColorScreenState createState() => _ProgressColorScreenState();
}

class _ProgressColorScreenState extends State<ProgressColorScreen> {
  Color currentColor = Colors.green;

  @override
  Widget build(BuildContext context) {
    // 获取分钟数并更新当前进度颜色
    int minutes = /* 从你的数据源获取分钟数 */;
    if (minutes <= 30) {
      currentColor = Colors.green;
    } else if (minutes <= 60) {
      currentColor = Colors.yellow;
    } else {
      currentColor = Colors.red;
    }

    return Scaffold(
      appBar: AppBar(
        title: Text('CircularPercentIndicator Demo'),
      ),
      body: Center(
        child: CircularPercentIndicator(
          radius: 120.0,
          lineWidth: 10.0,
          percent: 0.5,
          center: Text(
            "50%",
            style: TextStyle(fontWeight: FontWeight.bold, fontSize: 20.0),
          ),
          circularStrokeCap: CircularStrokeCap.round,
          linearGradient: [currentColor],
        ),
      ),
    );
  }
}