createCanvas(600, 600);

}

​

function draw() {

  background(45);

  stroke('yellow');

  strokeWeight(10);

  drawSpiral(300,300);

  stroke('pink');

  strokeWeight(6);

  drawSpiral(300,300);

    stroke('purple');

  strokeWeight(2);

  drawSpiral(300,300);

}

function drawSpiral(cy, cx){

  noFill();

  beginShape();

  for (let t = 0; t < 100; t++) {

    let m = map(t, 0, 150, 0, 30);

​

    x = m*10*cos(m) + cx;

    y = m*10*sin(m) + cy;

    vertex(x, y);

  }

  endShape();

}