box_point_zone.f90

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! Implements a box geometry subset.
module box_point_zone
  use point_zone, only: point_zone_t
  use num_types, only: rp
  use json_utils, only: json_get
  use json_module, only: json_file
  use math, only: abscmp
  implicit none
  private
 
  type, public, extends(point_zone_t) :: box_point_zone_t
     real(kind=rp) :: xmin
     real(kind=rp) :: xmax
     real(kind=rp) :: ymin
     real(kind=rp) :: ymax
     real(kind=rp) :: zmin
     real(kind=rp) :: zmax
   contains
     procedure, pass(this) :: init => box_point_zone_init_from_json
     procedure, pass(this) :: free => box_point_zone_free
     procedure, pass(this) :: criterion => box_point_zone_criterion
  end type box_point_zone_t
 
contains
 
  subroutine box_point_zone_init_from_json(this, json, size)
    class(box_point_zone_t), intent(inout) :: this
    type(json_file), intent(inout) :: json
    integer, intent(in) :: size
 
    character(len=:), allocatable :: str_read
    real(kind=rp), allocatable :: values(:)
    real(kind=rp) :: xmin, xmax, ymin, ymax, zmin, zmax
 
    call json_get(json, "x_bounds", values)
    xmin = values(1)
    xmax = values(2)
    call json_get(json, "y_bounds", values)
    ymin = values(1)
    ymax = values(2)
    call json_get(json, "z_bounds", values)
    zmin = values(1)
    zmax = values(2)
    call json_get(json, "name", str_read)
 
    call box_point_zone_init_common(this, size, trim(str_read), xmin, &
         xmax, ymin, ymax, zmin, zmax)
 
  end subroutine box_point_zone_init_from_json
 
  subroutine box_point_zone_init_common(this, size, name, xmin, xmax, ymin, ymax, &
       zmin, zmax)
    class(box_point_zone_t), intent(inout) :: this
    integer, intent(in), optional :: size
    character(len=*), intent(in) :: name
    real(kind=rp), intent(in) :: xmin
    real(kind=rp), intent(in) :: xmax
    real(kind=rp), intent(in) :: ymin
    real(kind=rp), intent(in) :: ymax
    real(kind=rp), intent(in) :: zmin
    real(kind=rp), intent(in) :: zmax
 
    call this%init_base(size, name)
 
    this%xmin = xmin
    this%xmax = xmax
    this%ymin = ymin
    this%ymax = ymax
    this%zmin = zmin
    this%zmax = zmax
 
  end subroutine box_point_zone_init_common
 
  subroutine box_point_zone_free(this)
    class(box_point_zone_t), intent(inout) :: this
 
    this%xmin = 0.0_rp
    this%xmax = 0.0_rp
    this%ymin = 0.0_rp
    this%ymax = 0.0_rp
    this%zmin = 0.0_rp
    this%zmax = 0.0_rp
 
    call this%free_base()
 
  end subroutine box_point_zone_free
 
  pure function box_point_zone_criterion(this, x, y, z, j, k, l, e) result(is_inside)
    class(box_point_zone_t), intent(in) :: this
    real(kind=rp), intent(in) :: x
    real(kind=rp), intent(in) :: y
    real(kind=rp), intent(in) :: z
    integer, intent(in) :: j
    integer, intent(in) :: k
    integer, intent(in) :: l
    integer, intent(in) :: e
    logical :: is_inside
    logical :: in_x, in_y, in_z
 
    ! inside x if xmin <= x <= xmax
    in_x = ( (x .gt. this%xmin .and. x .lt. this%xmax) .or. &
             (abscmp(x, this%xmin) .or. abscmp(x, this%xmax)))
 
    ! inside y if ymin <= y <= ymax
    in_y = ( (y .gt. this%ymin .and. y .lt. this%ymax) .or. &
             (abscmp(y, this%ymin) .or. abscmp(y, this%ymax)))
 
    ! inside z if zmin <= z <= zmax
    in_z = ( (z .gt. this%zmin .and. z .lt. this%zmax) .or. &
             (abscmp(z, this%zmin) .or. abscmp(z, this%zmax)))
 
    is_inside = in_x .and. in_y .and. in_z
  end function box_point_zone_criterion
 
end module box_point_zone