p3

import 'dart:math' as math;
import 'package:d_chart/d_chart.dart';
import 'package:flutter/material.dart';

List<OrdinalData> ordinalDataList = [
  OrdinalData(
    domain: 'Speed',
    measure: 70,
    color: Colors.deepPurple,
  ),
  OrdinalData(
    domain: '-',
    measure: 30,
    color: Colors.deepPurple.shade50,
  ),
];

SizedBox(
  height: 200,
  width: 200,
  child: Stack(
    children: [
      DChartPieO(
        data: ordinalDataList,
        configRenderPie: const ConfigRenderPie(
          arcWidth: 10,
          strokeWidthPx: 0,
          arcLength: math.pi,
          startAngle: math.pi,
        ),
      ),
      Positioned(
        right: 100,
        bottom: 100,
        child: Center(
          child: Transform.rotate(
            // 70 == speed
            angle: (70 * 1.8) * math.pi / 180,
            alignment: Alignment.centerRight,
            child: Image.asset(
              'assets/long-arrow.png',
              width: 56,
            ),
          ),
        ),
      ),
      const Positioned(
        bottom: 97,
        left: 0,
        right: 0,
        child: Icon(
          Icons.adjust,
          size: 16,
          color: Colors.deepPurple,
        ),
      ),
      const Positioned(
        bottom: 60,
        left: 16,
        right: 16,
        child: Row(
          mainAxisAlignment: MainAxisAlignment.spaceBetween,
          children: [
            Text(
              '00',
              style: TextStyle(
                fontSize: 16,
                color: Colors.black26,
              ),
            ),
            Text(
              '100',
              style: TextStyle(
                fontSize: 16,
                color: Colors.black26,
              ),
            ),
          ],
        ),
      ),
    ],
  ),
),