let sliderB;

​

function setup(){

  createCanvas(400, 400);

  //background(0);

  angleMode(RADIANS);

  //sliderA = createSlider(-10, 10, 0, 0);  

  sliderB = createSlider(-10, 10, 0, 0);  

}

​

function draw() {

  background(0);

   let a = 1.5;

   let b = -2.4;

  // let a = sliderA.value();

  // let b = sliderB.value();

​

  for (let i = 0; i < 5*PI; i++) {

    //let t = seq(0,5*pi, length.out=500);

    let x = (a + b*i) * cos(i);

    let y = (a + b*i) * sin(i);

    stroke(255);

    noFill();

    // strokeWeight(5);

    // arc(x, y, width, height, sliderA, sliderB)

    // arc(x, y, width, height, width/2, height)

    // line(width/2, height/2, x, y);

    beginShape();

      vertex(width/2, height/2);

    endShape();

  }

}