discontinuedPackage jet_cad_floor_plan has been discontinued and replaced by jet_cad_2d_plan.

signedArea function

double signedArea(List<Vector2> r)

The signed area of a closed ring, anticlockwise positive.

Implementation

double signedArea(List<Vector2> r) {
  var a = 0.0;
  for (var i = 0; i < r.length; i++) {
    final p = r[i], q = r[(i + 1) % r.length];
    a += p.x * q.y - q.x * p.y;
  }
  return a / 2;
}