convertArea function

double convertArea(Area from, Area to, double value)

Convert area. It may lose some decimals in the proccess.

from, to and value can NOT be null, otherwise an AssertionError is thrown

Basic usage:

main() {
  final area = convertArea(
    Area.squareMetre, // from
    Area.squareKilometre, // to
    10000000, // value
  );
  print(area); // 10
}

Read the documentation for more information

Implementation

double convertArea(Area from, Area to, double value) {
  verify(from, to, value);
  if (from == to) return value;
  if (from == Area.squareMetre) {
    switch (to) {
      case Area.squareKilometre:
        return value / 1e+6;
      case Area.squareMile:
        return value / 2.59e+6;
      case Area.squareYard:
        return value * 1.196;
      case Area.squareFoot:
        return value * 10.764;
      case Area.squareInch:
        return value * 1550;
      case Area.hectare:
        return value / 10000;
      case Area.acre:
        return value / 4047;
      default:
        return value;
    }
  } else {
    final squareMetre = Area.squareMetre;
    switch (from) {
      case Area.squareKilometre:
        return convertArea(squareMetre, to, value * 1e+6);
      case Area.squareMile:
        return convertArea(squareMetre, to, value * 2.59e+6);
      case Area.squareYard:
        return convertArea(squareMetre, to, value / 1.196);
      case Area.squareFoot:
        return convertArea(squareMetre, to, value / 10.764);
      case Area.squareInch:
        return convertArea(squareMetre, to, value / 1550);
      case Area.hectare:
        return convertArea(squareMetre, to, value * 10000);
      case Area.acre:
        return convertArea(squareMetre, to, value * 4047);
      default:
        return value;
    }
  }
}