const freeze = 32

const boil = 212

​

function setup() {

  createCanvas(200, 200);

  textAlign(CENTER)

}

​

function draw(){

  background(255)

​

  // map(currentValue, origMin, origMax, newMin, newMax)

  let size = map(temp, freeze, boil, 20, width)

  circle(100, 100, size)

  text(temp, 100, 104)

  temp += 1

  if (temp > boil){

    temp = freeze

  }

}