Immutable Canvas helper objects. No 'class' syntax, immutability through Object.assign and values scaled to devicePixelRatio

canvasObjects.js

let ScaledValue = {
  actual: 0,
  scaled() {
    return this.actual * devicePixelRatio
  },
  create(value) {
    return Object.assign({}, this, { actual: value })
  }
}

let Point = {
  values: [],
  scaled() {
    return this.values.map(v => v.scaled())
  },
  create(x, y) {
    let xs = ScaledValue.create(x)
    let xy = ScaledValue.create(y)
    return Object.assign({}, this, { values: [xs, xy] })
  }
}

let p1 = Point.create(10, 10)
console.log(p1.scaled()) // [20, 20] (where devicePixelRatio = 2)