Indy9000

def toRoman(i:int)->str:
  sym = ["M","CM","D","CD","C","XC","L","XL","X","IX","V","IV","I"]
  num = [1000,900,500,400,100,90,50,40,10,9,5,4,1]
  result = ""
  while i > 0:
    for j in range(len(num)):
      m = i // num[j]
      result += sym[j] * m
      i = i % num[j]
  return result

Indy9000

import 'dart:core';
import 'dart:math';

class Vector {
  List<num> vec;
  Vector(List<num> el) {
    vec = el;
  }
  operator [](index) => vec[index];

Indy9000

import 'dart:async';

import 'package:flutter/material.dart';

class Test extends StatefulWidget {
  @override
  _TestState createState() => _TestState();
}

class _TestState extends State<Test> {

Indy9000

class DataItem {
  final double value;
  final String label;
  final Color color;
  DataItem(this.value, this.label, this.color);
}

Indy9000

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

const pal = [0xFFF2387C, 0xFF05C7F2, 0xFF04D9C4, 0xFFF2B705, 0xFFF26241];

class MyApp extends StatelessWidget {
  final List<DataItem> dataset = [
    DataItem(0.2, "Comedy", Color(pal[0])),
    DataItem(0.25, "Action", Color(pal[1])),

Indy9000

class DonutChartWidget extends StatefulWidget {
  final List<DataItem> dataset;
  DonutChartWidget(this.dataset);
  @override
  _DonutChartWidgetState createState() => _DonutChartWidgetState();
}

class _DonutChartWidgetState extends State<DonutChartWidget> {
  @override
  Widget build(BuildContext context) {

Indy9000

class DonutChartPainter extends CustomPainter {
  final List<DataItem> dataset;
  DonutChartPainter(this.dataset);

  @override
  void paint(Canvas canvas, Size size) {
    final c = Offset(size.width / 2.0, size.height / 2.0);
    final radius = size.width * 0.9;
    final rect = Rect.fromCenter(center: c, width: radius, height: radius);
    final fullAngle = 360.0;

Indy9000

void drawSector(Canvas canvas, DataItem di, Rect rect, double startAngle,
    double sweepAngle) {
  final paint = Paint()
    ..style = PaintingStyle.fill
    ..color = di.color;
  canvas.drawArc(rect, startAngle, sweepAngle, true, paint);
}

Indy9000

  TextPainter measureText(
      String s, TextStyle style, double maxWidth, TextAlign align) {
    final span = TextSpan(text: s, style: style);
    final tp = TextPainter(
        text: span, textAlign: align, textDirection: TextDirection.ltr);
    // ellipsis: "...");
    tp.layout(minWidth: 0, maxWidth: maxWidth);
    return tp;
  }

Indy9000

void drawLabels(Canvas canvas, Offset c, double radius, double startAngle,
    double sweepAngle, String label) {
  final r = radius * 0.4;
  final dx = r * cos(startAngle + sweepAngle / 2.0);
  final dy = r * sin(startAngle + sweepAngle / 2.0);
  final position = c + Offset(dx, dy);
  drawTextCentered(canvas, position, label, labelStyle, 100.0, (Size sz) {
    final rect = Rect.fromCenter(
        center: position, width: sz.width + 5, height: sz.height + 5);
    final rrect = RRect.fromRectAndRadius(rect, Radius.circular(5));