class Vector2D extends Vecteur {

  public boolean isColinear(Vector2D vect) {
    if (vect.getX() * this.getY() == vect.getY() * this.getX())
      return true;
    return false;
  }

  public  Vector2D(double x, double y);
  public  Vector2D();
  public  Vector2D(IDirectPosition dp1, IDirectPosition dp2);
  public  Vector2D(IDirectPosition dp1);
  public  Vector2D(Angle angle, double norm);

}