signedArea function

dynamic signedArea(dynamic data, dynamic start, dynamic end, dynamic dim,)

Implementation

signedArea(data, start, end, dim) {
  var sum = 0.0;
  for (var i = start, j = end - dim; i < end; i += dim) {
    sum += (data[j] - data[i]) * (data[i + 1] + data[j + 1]);
    j = i;
  }

  return sum;
}