!-----------------------------------------------------------------------
!-
!       test program for the project "gravity field"
!-
!-----------------------------------------------------------------------
program essai
  use realfield
  use spitpgm               ! XXX

  implicit none

  ! some configuration constants
  integer, parameter      :: S_WIDTH  = 800
  integer, parameter      :: S_HEIGHT = 600
  integer, parameter      :: NB_BODY  = 51

  type(massbody)          :: planets(NB_BODY)
  integer                 :: foo
  character(len=100)      :: filename

  call init_random()
  call create_some_planets(planets, 45e5, S_WIDTH, S_HEIGHT)

  do foo=0, 1999
    write (filename, "(a, i5.5, a)") 'WS/', foo, '.pgm'
    call build_and_write_a_field(S_WIDTH, S_HEIGHT, planets, filename)
    ! print *, trim(filename)
    ! OMG! two magic numbers, wtf?
    planets(1)%posx = planets(1)%posx + 3 + (4.5*rand())
    planets(1)%posy = planets(1)%posy + 3 + (2.1*rand())
    if (planets(1)%posx .GT. S_WIDTH)   planets(1)%posx = 0.0
    if (planets(1)%posy .GT. S_HEIGHT)  planets(1)%posy = 0.0

    call boulegue_les_astres(planets, 2.21)

  enddo

  STOP 'BECAUSE YOLO'

contains
!-----------------------------------------------------------------------
!-
!    Et si on bougeait un peu tous ces corps planétaires ?
!-
subroutine boulegue_les_astres(astres, factor)
  type(massbody), intent(inout)     :: astres(:)
  real, intent(in)                  :: factor

  integer                           :: foo

  do foo = 2, ubound(astres, 1)
      astres(foo)%posx = astres(foo)%posx + factor*(rand() - 0.5)
      astres(foo)%posy = astres(foo)%posy + factor*(rand() - 0.5)
  enddo


end subroutine
!-----------------------------------------------------------------------
!-----------------------------------------------------------------------

end program