Perlin

let xoff;

let yoff = 0;

let cells = [];

let position;

let velocity;

​

function setup() {

  createCanvas(windowWidth, windowHeight);

  background(100);

  for(i = 0; i < width; i ++){

    cells[i] = [];

    xoff = 0;

    for(j = 0; j < height; j ++){

      let theta = map(noise(xoff,yoff),0,1,0,TWO_PI);

      cells[i][j] = createVector(cos(theta),sin(theta));

    }

    yoff += 0.1;

  }

}

​

function draw() {

  position = createVector(200, 200);

  velocity = cells[position.x][position.y];

  position.add(velocity);

  ellipse(position.x,position.y,30);

}