createRandomAutoPanSegment.js

function createRandomAutoPanSegment() {
  let result = [];
  let length = Math.floor(Math.random() * 5 + 5);
  let pos = 0;

  for (let i = 0; i < length; i++) {
    if (Math.random() * 0.8 < i / length) {
      pos = 1;
    }
    if (pos === 0) {
      if (Math.random() < 0.2) {
        pos += Math.random() * 0.6;
      }
    } else if (1 <= pos) {
      pos = 1;
    } else if (Math.random() < 0.1) {
      pos += Math.random() * 0.6;
    }
    result[i] = pos;
  }
  result[0] = 0;
  result = result.map(x => x * 2 - 1);

  return result;
}