zMinMax static method

void zMinMax(CoordinateSequence cs, List<double> target)

Determine the min and max "z" values in an array of Coordinates.

@param cs The array to search. @param target array with at least two elements where to hold the min and max zvalues. target0 will be filled with the minimum zvalue, target1 with the maximum. The array current values, if not NaN, will be taken into acount in the computation.

Implementation

static void zMinMax(final CoordinateSequence cs, List<double> target) {
  if (cs.getDimension() < 3) {
    return;
  }
  double zmin;
  double zmax;
  bool validZFound = false;

  zmin = double.nan;
  zmax = double.nan;

  double z;
  final int size = cs.size();
  for (int t = size - 1; t >= 0; t--) {
    z = cs.getOrdinate(t, 2);

    if (!(z.isNaN)) {
      if (validZFound) {
        if (z < zmin) {
          zmin = z;
        }

        if (z > zmax) {
          zmax = z;
        }
      } else {
        validZFound = true;
        zmin = z;
        zmax = z;
      }
    }
  }

  if (!zmin.isNaN) {
    target[0] = zmin;
  }
  if (!zmax.isNaN) {
    target[1] = (zmax);
  }
}