push()

  rectMode(CENTER)

  translate(x+w/2, y+h/2)

  rotate(angle)

  rect(0, 0, w, h)

  pop()

}

​

​

let temp = 72

const freeze = 32

const boil = 212

​

function setup() {

  createCanvas(200, 200);

  angleMode(DEGREES)

  textAlign(CENTER)

  noStroke()

  fill(0)

}

​

function draw(){

  background(255)

​

  let angle = map(temp, freeze, boil, 0, 90)

  drawBox(50, 90, 100, 25, angle)

  text(temp, 100, 180)

  temp += 1

  if (temp > boil){

    temp = freeze

  }

}