let r = 100;

let increment;

let amount = 2000;

​

function setup() {

  createCanvas(500, 500);

  background(220);

  fill(0);

  // noStroke();

  stroke(50, 0, 15);

  stroke(0);

  frameRate(30);

  strokeWeight(0.75);

​

}

​

function draw() {

  // background(150, 250, 190);

  background(230);

  increment = TWO_PI / amount;

  t = frameCount;

  let k = 0;

  let curve = map(sin(frameCount * 0.05), -1, 1, 0.99, 1.01);

  beginShape();

  for (let i = 0; i < TWO_PI; i += increment) {

    r = map(sin(i * 3), -1, 1, curve, 1) * 1;

    x = cos(i) * r + 250;

    y = sin(i) * r + 250;

    vertex(x, y);

    // y = x * x;

    if (k % 5 == 0) {

        let j = i + increment;

      let r2 = map(sin(j * 3), -1, 1, curve, 1) * 1;

        let x2 = cos(j) * r2 + 250;

        let y2 = sin(j) * r2 + 250;

      // y2 = 

      // ellipse(x, y, 10);

      // stroke(0);

            let slope = (y2 - y) / (x2 - x);

      let x0 = x - 1000;

      let x3 = x2 + 1000;

      let y0 = y - 1000 * slope;

      let y3 = y2 + 1000 * slope;

      line(x0, y0, x3, y3);

      // noStroke();

    }

    // ellipse(x, y, 2);

    k++;

  }

  endShape();

}