pressure.dart

class Pressure {
  final double nPa; // nanopascals e-9
  const Pressure.nPa(this.nPa);
  const Pressure.uPa(double uPa) : nPa = uPa * 1000;
  const Pressure.mPa(double mPa) : nPa = mPa * 1000000;

  const Pressure.zero() : nPa = 0;
  const Pressure.max() : nPa = double.maxFinite;
  Pressure operator +(Pressure other) => Pressure.nPa(nPa + other.nPa);
  Pressure operator -(Pressure other) => Pressure.nPa(nPa - other.nPa);
  Pressure scaleBy(double multiplier) => Pressure.nPa(nPa * multiplier);
  Pressure operator *(Pressure other) => Pressure.nPa(nPa * other.nPa);
  bool operator >=(Pressure other) => nPa >= other.nPa;
  Ti toTi() => Ti(nPa);

  static const double microMultiplier = 1000;
  static const double milliMultiplier = 1000000;

  @override
  String toString() {
    var value = nPa;
    var suffix = "nPa";
    if (value >= milliMultiplier) {
      value /= milliMultiplier;
      suffix = 'mPa';
    } else if (value >= microMultiplier) {
      value /= microMultiplier;
      suffix = 'uPa';
    }
    return "${value.toStringAsFixed(1)}$suffix";
  }
}