let d = 97;

let button;

let nchoice = [2, 3, 4, 5, 6, 7];

let dchoice = [39, 47, 31, 97, 71, 19];

​

function setup() {

  createCanvas(600, 400);

  angleMode(DEGREES);

  button = createButton("More Roses");

  button.style('padding', '6pt');

  button.position(250, height);

  button.mousePressed(rose);

}

​

function rose() {

  n = random(nchoice);

  for (let i = 0; i < nchoice.length; i++) {

    if (nchoice[i] == n) {

      d = dchoice[i];

      break;

    }

  }

}

​

function draw() {

  background(255);

​

  translate(width / 2, height / 2);

  stroke(0, 0, 255, 200);

  noFill();

  rotate(180);

​

  beginShape();

  strokeWeight(1);

  for (let i = 0; i < 361; i++) {

    let k = i * d;

    let r = 150 * sin(n * k);

    let x = r * cos(k);

    let y = r * sin(k);

    vertex(x, y);

  }

  endShape();

​

  stroke(255, 0, 0);

  strokeWeight(2);

  beginShape();

  for (let i = 0; i < 361; i++) {

    let k = i;

    let r = 150 * sin(n * k);

    let x = r * cos(k);

    let y = r * sin(k);

    vertex(x, y);

  }

  endShape();

}