Problems with converting a P5.js sketch to Processing

p5.js Coding Questions
4

This is my take on it. Here’s my forked version: :fork_and_knife:

/**
 * Tadpoles (v1.0.1) [Java/Pjs]
 *
 * p5.js by Srdjan Markovi.ch (2016/Oct/13)
 * https://OpenProcessing.org/sketch/386063
 *
 * Pjs fork by GoToLoop (2021/Jun/29)
 * https://OpenProcessing.org/sketch/1226376
 *
 * https://Discourse.Processing.org/t/
 * problems-with-converting-a-p5-js-sketch-to-processing/30963/4
 */

final Tadpole[] tadpoles = new Tadpole[120];

void setup() {
  size(500, 500);
  noStroke();
  for (int i = 0; i < tadpoles.length; tadpoles[i++] = new Tadpole());
}

void draw() {
  background(-1);
  for (final Tadpole tadpole : tadpoles)  tadpole.update().display();
}

class Tadpole {
  final PVector prevs[] = new PVector[10], pos = new PVector();
  float t = random(10000), ts = random(100);

  Tadpole() {
    for (int i = 0; i < prevs.length; prevs[i++] = new PVector());
  }

  Tadpole update() {
    final float tts = t + ts;
    t += .005;

    pos.set(noise(tts) * width, noise(tts + 100) * height);
    prevs[0].set(pos);

    return this;
  }

  Tadpole display() {
    fill(0);
    ellipse(pos.x, pos.y, 4, 4);
    fill(20, 50, 0, 10);

    for (int i = prevs.length; --i > 0; ) {
      final PVector curr = prevs[i];
      final int diam = 14 - i;

      curr.set(prevs[i - 1]);
      ellipse(curr.x, curr.y, diam, diam);
    }

    return this;
  }
}