random on circle with p5.js

randomOnCircle.js

// Please run on p5.js Web Editor or OpenProcessing.
// https://editor.p5js.org/
// https://www.openprocessing.org/

function randomOnCircle() {
  const theta = 2.0 * Math.PI * Math.random();
  return [Math.cos(theta), Math.sin(theta)];
}

function setup() {
  createCanvas(300, 300);
  noLoop();  
}

function draw() {
  const halfSize = [0.5 * width, 0.5 * height];
  background(240);
  fill(0);
  noStroke();
  for(let i = 0; i < 1000; i++) {
    const pos = randomOnCircle();
    circle(
      halfSize[0] * (1.0 + 0.75 * pos[0]), 
      halfSize[1] * (1.0 + 0.75 * pos[1]),
      2.0
    );
  }
}