98 lines
2.6 KiB
Fortran
98 lines
2.6 KiB
Fortran
!-----------------------------------------------------------------------
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!
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! project "gravity field"
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!
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!-----------------------------------------------------------------------
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program essai
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use realfield
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use spitpgm ! XXX
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implicit none
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type(massbody) :: planet
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integer :: foo
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character (len=100) :: filename
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planet%posx = 337.314
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planet%posy = 164.666
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planet%mass = 1e8
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planet%serial = 42
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do foo=0, 48
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write (filename, "(a, i5.5, a)") 'WS/', foo, '.pgm'
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call build_and_write_a_field(800, 600, planet, filename)
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planet%posx = planet%posx + 6.99
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planet%posy = planet%posy + 2.55
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enddo
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STOP 'YOLO'
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contains
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!-----------------------------------------------------------------------
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!-
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! compute a field with only one body; and write pic file
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!-
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subroutine build_and_write_a_field(szx, szy, moon, fname)
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integer, intent(in) :: szx, szy
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type(massbody), intent(in) :: moon
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character (len=*), intent(in) :: fname
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real :: maxi, mini
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integer :: errcode
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real, dimension(:,:), allocatable :: field
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integer, dimension(:,:), allocatable :: greymap
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allocate(field(szx, szy), stat=errcode)
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call compute_a_field(field, moon)
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maxi = maxval(field)
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mini = minval(field)
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print *, "field: ", mini, maxi, maxi-mini
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allocate(greymap(szx, szy), stat=errcode)
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greymap = 65535
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! convert from real value to 16 bits int values
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where (field < 65530.0)
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greymap = int(field)
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end where
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call spit_as_pgm_16(greymap, trim(fname))
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! make valgrind happy
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deallocate(field)
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deallocate(greymap)
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end subroutine
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!-----------------------------------------------------------------------
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!-
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! Compute the gravity field in a pre-allocated array relative
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! to the massbody 'moon'. Nobody know where the magic number
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! come from, sorry.
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!-
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subroutine compute_a_field(field, moon)
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real, dimension(:,:), intent(out) :: field
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type(massbody), intent(in) :: moon
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integer :: ix, iy
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real :: fx, fy
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real :: grav
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! print *, "pic size ", ubound(field, 1), "W", ubound(field, 2), "H"
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! print *, "mass body ", moon
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do ix=1, ubound(field, 1)
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fx = real(ix)
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do iy=1, ubound(field, 2)
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fy = real(iy)
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grav = compute_gravity(fx, fy, moon)
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field(ix,iy) = grav
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enddo
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enddo
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end subroutine
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!-----------------------------------------------------------------------
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!-----------------------------------------------------------------------
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end program
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