program main

!*****************************************************************************80
!
!! ellipse_grid_test() tests ellipse_grid().
!
!  Licensing:
!
!    This code is distributed under the MIT license.
!
!  Modified:
!
!    10 November 2011
!
!  Author:
!
!    John Burkardt
!
  implicit none

  call timestamp ( )
  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) 'ellipse_grid_test():'
  write ( *, '(a)' ) '  FORTRAN90 version'
  write ( *, '(a)' ) '  Test ELLIPSE_GRID().'

  call ellipse_grid_test01 ( )
!
!  Terminate.
!
  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) 'ELLIPSE_GRID_TEST:'
  write ( *, '(a)' ) '  Normal end of execution.'
  write ( *, '(a)' ) ' '
  call timestamp ( )

  stop 0
end
subroutine ellipse_grid_test01 ( )

!*****************************************************************************80
!
!! ELLIPSE_GRID_TEST01 tests ELLIPSE_GRID.
!
!  Licensing:
!
!    This code is distributed under the MIT license.
!
!  Modified:
!
!    10 November 2011
!
!  Author:
!
!    John Burkardt
!
  implicit none

  integer, parameter :: rk = kind ( 1.0D+00 )

  real ( kind = rk ) c(2)
  character ( len = 80 ) filename
  integer n
  integer ng
  real ( kind = rk ) r(2)
  real ( kind = rk ), allocatable :: xy(:,:)

  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) 'TEST01:'
  write ( *, '(a)' ) '  ELLIPSE_GRID can define a grid of points'
  write ( *, '(a)' ) '  with N+1 points on the minor half axis,'
  write ( *, '(a)' ) '  based on any ellipse.'

  n = 8
  r(1) = 2.0D+00
  r(2) = 1.0D+00
  c(1) = 1.0D+00
  c(2) = 2.0D+00

  write ( *, '(a)' ) ' '
  write ( *, '(a,i8)' ) '  We use N = ', n
  write ( *, '(a,g14.6,a,g14.6,a)' ) '  Radius R = (', r(1), ',', r(2), ')'
  write ( *, '(a,g14.6,a,g14.6,a)' ) '  Center C = (', c(1), ',', c(2), ')'

  call ellipse_grid_count ( n, r, c, ng )

  write ( *, '(a)' ) ' '
  write ( *, '(a,i8)' ) '  Number of grid points will be ', ng

  allocate ( xy(2,ng) )

  call ellipse_grid ( n, r, c, ng, xy )

  call r82vec_print_part ( ng, xy, 20, '  Part of the grid point array:' )

  filename = 'ellipse_grid_test01.xy'

  call r8mat_write ( filename, 2, ng, xy )

  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) '  Data written to the file "' // trim ( filename ) // '".'

  deallocate ( xy )

  return
end
subroutine timestamp ( )

!*****************************************************************************80
!
!! timestamp() prints the current YMDHMS date as a time stamp.
!
!  Example:
!
!    31 May 2001   9:45:54.872 AM
!
!  Licensing:
!
!    This code is distributed under the MIT license.
!
!  Modified:
!
!    18 May 2013
!
!  Author:
!
!    John Burkardt
!
  implicit none

  character ( len = 8 ) ampm
  integer d
  integer h
  integer m
  integer mm
  character ( len = 9 ), parameter, dimension(12) :: month = (/ &
    'January  ', 'February ', 'March    ', 'April    ', &
    'May      ', 'June     ', 'July     ', 'August   ', &
    'September', 'October  ', 'November ', 'December ' /)
  integer n
  integer s
  integer values(8)
  integer y

  call date_and_time ( values = values )

  y = values(1)
  m = values(2)
  d = values(3)
  h = values(5)
  n = values(6)
  s = values(7)
  mm = values(8)

  if ( h < 12 ) then
    ampm = 'AM'
  else if ( h == 12 ) then
    if ( n == 0 .and. s == 0 ) then
      ampm = 'Noon'
    else
      ampm = 'PM'
    end if
  else
    h = h - 12
    if ( h < 12 ) then
      ampm = 'PM'
    else if ( h == 12 ) then
      if ( n == 0 .and. s == 0 ) then
        ampm = 'Midnight'
      else
        ampm = 'AM'
      end if
    end if
  end if

  write ( *, '(i2,1x,a,1x,i4,2x,i2,a1,i2.2,a1,i2.2,a1,i3.3,1x,a)' ) &
    d, trim ( month(m) ), y, h, ':', n, ':', s, '.', mm, trim ( ampm )

  return
end