Function hypot

libraries/p5.js:26744–26781

(x, y, z)

// This won't under- or overflow in intermediate steps
// https://en.wikipedia.org/wiki/Hypot
function hypot(x, y, z) {
  // Use the native implementation if it's available
  if (typeof Math.hypot === 'function') {
    return Math.hypot.apply(null, arguments);
  }

  // Otherwise use the V8 implementation
  // https://github.com/v8/v8/blob/8cd3cf297287e581a49e487067f5cbd991b27123/src/js/math.js#L217
  var length = arguments.length;
  var args = [];
  var max = 0;
  for (var i = 0; i < length; i++) {
    var n = arguments[i];
    n = +n;
    if (n === Infinity || n === -Infinity) {
      return Infinity;
    }
    n = Math.abs(n);
    if (n > max) {
      max = n;
    }
    args[i] = n;
  }

  if (max === 0) {
    max = 1;
  }
  var sum = 0;
  var compensation = 0;
  for (var j = 0; j < length; j++) {
    var m = args[j] / max;
    var summand = m * m - compensation;
    var preliminary = sum + summand;
    compensation = (preliminary - sum) - summand;
    sum = preliminary;
  }
  return Math.sqrt(sum) * max;
}

module.exports = p5;