172 lines
5.1 KiB
Fortran
172 lines
5.1 KiB
Fortran
!-----------------------------------------------------------------------
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!-
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! Project "gravity field" - Firts renderer
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!-
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!-----------------------------------------------------------------------
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program animation
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use realfield
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use spitpgm
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implicit none
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! some configuration constants
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integer, parameter :: S_WIDTH = 1024
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integer, parameter :: S_HEIGHT = 1024
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integer, parameter :: NB_BODY = 50
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!!! WARNING : global variable !!!
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type(massbody) :: planets(NB_BODY)
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call init_random()
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call create_some_planets(planets, 1664e3, S_WIDTH , S_HEIGHT)
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call print_barycentre_bodies(planets)
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! STOP 'BEFORE CRASH'
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call la_grande_boucle(0, 2000, planets)
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STOP ': YOLO TIME *NOW*'
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!-----------------------------------------------------------------------
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contains
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!-
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! fabrication d'une de la sequence complete
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!-
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subroutine la_grande_boucle(start, nbre, moons)
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integer, intent(in) :: start, nbre
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type(massbody), intent(inout) :: moons(:)
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character(len=100) :: filename
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integer :: pass
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do pass=start, start+nbre-1
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! if second parameter is TRUE, use clipping,
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! else use ?????ing
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call deplace_les_planetes(moons, .TRUE.)
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write (filename, "(a, i5.5, a)") 'WS/nanim/', pass, '.pgm'
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write(0, '(3I5, " * ", a20)') start, nbre, pass, filename
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call build_and_write_a_field(S_WIDTH, S_HEIGHT, moons, filename)
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write (filename, "(a, i5.5, a)") 'WS/data/', pass, '.txt'
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call save_bodies_to_txt_file (planets, filename)
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write (filename, "(a, i5.5, a)") 'WS/colmap/', pass, '.pgm'
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call make_color_map(planets, filename, S_WIDTH, S_HEIGHT)
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enddo
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call print_barycentre_bodies(moons)
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end subroutine
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!-----------------------------------------------------------------------
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!-
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subroutine make_color_map(moons, fname, width, height)
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type(massbody), intent(in) :: moons(:)
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character(len=*), intent(in) :: fname
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integer, intent(in) :: width, height
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integer, dimension(:,:), allocatable :: map
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integer :: ix, iy, near, ipl
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integer :: errcode
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real :: curdist, smalldist
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real :: fx, fy, dx, dy
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write(0, *) "colmap ", ubound(moons, 1), "moons to ", trim(fname)
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! write(0, *) "mapsize ", width, height
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allocate (map(width, height), stat=errcode)
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! write(0, *) "errcode allocate ", errcode
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map = -1 ! invalidate colmap
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! DO SOME GOOD STUFF HERE
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do ix=1, width
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fx = real(ix)
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do iy=1, height
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fy = real(iy)
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near = -1
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smalldist = 1e37
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! loop over all the planet's bodies
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do ipl=1, ubound(moons, 1)
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! compute the "fake" distance
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dx = fx - moons(ipl)%posx
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dy = fy - moons(ipl)%posy
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curdist = (dx*dx) + (dy*dy)
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if (curdist .LT. smalldist) then
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near = ipl
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smalldist = curdist
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endif
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end do ! loop on all the moons, ipl index
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map(ix, iy) = mod(near*13, 255)
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enddo
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enddo
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call spit_as_pgm_8(map, fname)
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deallocate(map)
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end subroutine
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!-----------------------------------------------------------------------
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!-
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! C'est ici que se passe le deplacement des choses mouvantes
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!-
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! Il y a deux manieres d'aborder les bords de l'univers (non, le combo
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! segfault/coredump n'en fait pas partie).
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!-
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subroutine deplace_les_planetes(moons, clipit)
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type(massbody), intent(inout) :: moons(:)
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logical, intent(in) :: clipit
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integer :: foo
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real :: depx, depy
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integer, parameter :: EE = 51
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integer :: SW = S_WIDTH - EE
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integer :: SH = S_HEIGHT - EE
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do foo=1, ubound(moons, 1)
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! print *, "----- deplace ",foo, "serial ", moons(foo)%serial
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depx = moons(foo)%speed * sin(moons(foo)%heading)
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depy = moons(foo)%speed * cos(moons(foo)%heading)
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moons(foo)%posx = moons(foo)%posx + depx
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moons(foo)%posy = moons(foo)%posy + depy
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!-
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! ici se pose une question pertinente sur la gestion des
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! bords du chanmp. Clipping, Toring or Boucing ?
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!-
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if (clipit) then
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if (moons(foo)%posx .GT. SW) moons(foo)%posx = SW
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if (moons(foo)%posy .GT. SH) moons(foo)%posy = SH
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if (moons(foo)%posx .LT. EE) moons(foo)%posx = EE
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if (moons(foo)%posy .LT. EE) moons(foo)%posy = EE
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! STOP 'BECAUSE WE ARE TOTALY FUCKED'
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else
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if (moons(foo)%posx .GT. SW) moons(foo)%posx = EE
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if (moons(foo)%posy .GT. SH) moons(foo)%posy = EE
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if (moons(foo)%posx .LT. EE) moons(foo)%posx = SW
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if (moons(foo)%posy .LT. EE) moons(foo)%posy = SH
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endif
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moons(foo)%heading = moons(foo)%heading + (0.73*(rand()-0.50))
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if (moons(foo)%heading .GT. 6.2831853) moons(foo)%heading = 0.0
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if (moons(foo)%heading .LT. 0.0000001) moons(foo)%heading = 0.0
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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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