ascii-pie-chart.js

function piechart(data, radius=10) {
  var k = Object.keys(data)
  var v = Object.values(data)
  var r = radius
  d = r * 2;
  M = Math;
  R = M.round;
  p = [];
  for (y = 0; y < d; y++) {
    p[y] = [];
    for (x = 0; x < d; x++) {
      p[y][x] = ' '
    }
  }
  t = 0;
  i = -1;
  for (f = 0; f < 1; f += 1 / (r * 25)) {
    if (f > t) {
      t += v[++i]
    }
    a = M.PI * 2 * f;
    for (j = 0; j < r; j++){
      p[R(M.sin(a) * j) + r][R(M.cos(a) * j) + r] = k[i]
    } 
  }
  s = "";
  for (y = 0; y < d; y++) {
    for (x = 0; x < d; x++){
      s += `${p[y][x]} `; 
    }
    s += "\n";
  }
  return s.split('\n')
}

pie = piechart({ A: .3, B: .5, C: .2 }, 5).map(e=>'// ' + e).join('\n')
copy(pie)
console.log(pie)

//                     
//       B B B C C     
//     B B B B C C C   
//   B B B B B C C C C 
//   B B B B C C C C C 
//   B B B B C C C C C 
//   B B B B B A A A A 
//   B B B B A A A A A 
//     B B B A A A A   
//       B B A A A     
//