// Choo Choo!

// Thanks for the great workshop at PCD in Copenhagen!

// June 14th 2022, Copenhagen

// 

​

let col = 0;

​

function setup() {

  createCanvas(400, 400);

  colorMode(HSB, 360, 100, 100)

  angleMode(DEGREES);

}

​

function sgn(w){

  if (w < 0) return -1;

  else if (w == 0) return 0;

  else return 1;

}

​

function draw() {

  background(255);

  translate(width / 2, height / 2);

  let distance = dist(width / 2, height / 2, mouseX, mouseY);

  let n = map(distance, 0, 300, 2.5, 0);

  let a = 120;

  let b = 100;

​

  noFill()

  strokeWeight(map(mouseX, 0, width, 8, 64));

  for (let t = 0; t < 360; t += 1){

    stroke(col, 100, 100);

    col += 1;

    if(col > 360) {

      col = 0;

    }

    let  r = 100;

    let x = pow(abs(cos(t)), 2/n) * a * sgn(cos(t));

    let y = pow(abs(sin(t)), 2/n) * b * sgn(sin(t));

    point(x,y);

  }

}