Okazari/Rythm.js

export default (elem, value, options = {}) => {
  const max = !isNaN(options.max) ? options.max : 25
  const min = !isNaN(options.min) ? options.min : 0
  let borderRadius = (max - min) * value
  if (options.reverse) {
    borderRadius = max - borderRadius
  } else {
    borderRadius = min + borderRadius
  }
  elem.style.borderRadius = `${borderRadius}px`
}

export const reset = elem => {
  elem.style.borderRadius = ''
}