Bug with `CircularPercentIndicator.animation`

[FMorschel]

Hi, I found these errors with CircularPercentIndicator when I have animation set to true.

First; when animating and having arcType: ArcType.HALF, if I set percent to 0, it gives an error. Second; when not animating and having arcType: null, the widgetIndicator just vanishes. Also, it seems a bit odd that when you set arcType it changes the default colours. PS: Third: sadly when I tested this arcType with null, also found an error with the positioning of the widgetIndicator not considering startAngle.

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

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: const MyHomePage(),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({super.key});

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  @override
  Widget build(BuildContext context) {
    final theme = Theme.of(context);
    return Scaffold(
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.spaceAround,
          children: [
            Flexible(
              child: FittedBox(
                child: CircularPercentIndicator(
                  percent: 0.7,
                  startAngle: 270,
                  arcType: ArcType.HALF,
                  radius: 100,
                  lineWidth: 20,
                  animation: true,
                  circularStrokeCap: CircularStrokeCap.round,
                  progressColor: theme.colorScheme.primary,
                  widgetIndicator: const Center(
                    child: CircleAvatar(
                      radius: 12,
                      backgroundColor: Colors.white,
                    ),
                  ),
                ),
              ),
            ),
            Flexible(
              child: FittedBox(
                child: CircularPercentIndicator(
                  percent: 0,
                  startAngle: 270,
                  arcType: ArcType.HALF,
                  radius: 100,
                  lineWidth: 20,
                  circularStrokeCap: CircularStrokeCap.round,
                  progressColor: theme.colorScheme.primary,
                  widgetIndicator: const Center(
                    child: CircleAvatar(
                      radius: 12,
                      backgroundColor: Colors.white,
                    ),
                  ),
                ),
              ),
            ),
            Flexible(
              child: FittedBox(
                child: CircularPercentIndicator(
                  percent: 0,
                  startAngle: 270,
                  arcType: ArcType.HALF,
                  radius: 100,
                  lineWidth: 20,
                  animation: true,
                  circularStrokeCap: CircularStrokeCap.round,
                  progressColor: theme.colorScheme.primary,
                  widgetIndicator: const Center(
                    child: CircleAvatar(
                      radius: 12,
                      backgroundColor: Colors.white,
                    ),
                  ),
                ),
              ),
            ),
            Flexible(
              child: FittedBox(
                child: CircularPercentIndicator(
                  percent: 0,
                  startAngle: 270,
                  radius: 100,
                  lineWidth: 20,
                  animation: true,
                  circularStrokeCap: CircularStrokeCap.round,
                  progressColor: theme.colorScheme.primary,
                  widgetIndicator: const Center(
                    child: CircleAvatar(
                      radius: 12,
                      backgroundColor: Colors.white,
                    ),
                  ),
                ),
              ),
            ),
            Flexible(
              child: FittedBox(
                child: CircularPercentIndicator(
                  percent: 0.1,
                  startAngle: 270,
                  radius: 100,
                  lineWidth: 20,
                  animation: true,
                  circularStrokeCap: CircularStrokeCap.round,
                  progressColor: theme.colorScheme.primary,
                  widgetIndicator: const Center(
                    child: CircleAvatar(
                      radius: 12,
                      backgroundColor: Colors.white,
                    ),
                  ),
                ),
              ),
            ),
          ],
        ),
      ),
    );
  }
}