map function

double map(
  1. dynamic v,
  2. dynamic start1,
  3. dynamic stop1,
  4. dynamic start2,
  5. dynamic stop2
)

Implementation

double map(v, start1, stop1, start2, stop2) {
  return (v - start1) / (stop1 - start1) * (stop2 - start2) + start2;
}