sphere_point_zone.f90

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! Implements a sphere geometry subset.
module sphere_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) :: sphere_point_zone_t
     real(kind=rp) :: x0
     real(kind=rp) :: y0
     real(kind=rp) :: z0
     real(kind=rp) :: radius
   contains
     procedure, pass(this) :: init => sphere_point_zone_init_from_json
     procedure, pass(this) :: free => sphere_point_zone_free
     procedure, pass(this) :: criterion => sphere_point_zone_criterion
  end type sphere_point_zone_t
 
contains
 
  subroutine sphere_point_zone_init_from_json(this, json, size)
    class(sphere_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) :: value
    real(kind=rp) :: x0, y0, z0, radius
 
    call json_get(json, "center", values)
    x0 = values(1)
    y0 = values(2)
    z0 = values(3)
    call json_get(json, "radius", value)
    radius = value
    call json_get(json, "name", str_read)
 
    call sphere_point_zone_init_common(this, size, trim(str_read), x0, &
         y0, z0, radius)
 
  end subroutine sphere_point_zone_init_from_json
 
  subroutine sphere_point_zone_init_common(this, size, name, x0, y0, z0, radius)
    class(sphere_point_zone_t), intent(inout) :: this
    integer, intent(in), optional :: size
    character(len=*), intent(in) :: name
    real(kind=rp), intent(in) :: x0
    real(kind=rp), intent(in) :: y0
    real(kind=rp), intent(in) :: z0
    real(kind=rp), intent(in) :: radius
 
    call this%init_base(size, name)
 
    this%x0 = x0
    this%y0 = y0
    this%z0 = z0
    this%radius = radius
 
  end subroutine sphere_point_zone_init_common
 
  subroutine sphere_point_zone_free(this)
    class(sphere_point_zone_t), intent(inout) :: this
 
    call this%free_base()
 
    this%x0 = 0.0_rp
    this%y0 = 0.0_rp
    this%z0 = 0.0_rp
    this%radius = 0.0_rp
 
  end subroutine sphere_point_zone_free
 
  pure function sphere_point_zone_criterion(this, x, y, z, j, k, l, e) result(is_inside)
    class(sphere_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
 
    real(kind=rp) :: dist_from_center
 
    dist_from_center = sqrt( (x - this%x0)**2 + (y - this%y0)**2 + (z - this%z0)**2 )
 
    ! Inside if distance from center <= radius
    is_inside = (dist_from_center .lt. this%radius .or. &
                 abscmp(dist_from_center, this%radius))
 
  end function sphere_point_zone_criterion
 
end module sphere_point_zone