first real run, make a gif89a, need more tweaking
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tTh
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GravityField/.gitignore
vendored
4
GravityField/.gitignore
vendored
@ -1,6 +1,10 @@
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essai
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WS/*.pgm
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*.gif
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foo.pgm
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bar.pgm
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@ -2,7 +2,8 @@
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# Fortraneries by tTh - Gravity Field
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#
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GFOPT = -Wall -Wextra -g -time
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GFOPT = -Wall -Wextra -g -time -pg -I../Modules
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MODOBJ = '../Modules/spitpgm.o'
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all: essai
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@ -10,6 +11,6 @@ realfield.o: realfield.f90 Makefile
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gfortran $(GFOPT) -c $<
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essai: essai.f90 Makefile realfield.o
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gfortran $(GFOPT) $< realfield.o -o $@
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gfortran $(GFOPT) $< realfield.o $(MODOBJ) -o $@
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@ -1,54 +1,97 @@
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!-----------------------------------------------------------------------
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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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planet%posx = 1337.314
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planet%posy = 1664.666
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planet%mass = 1e4
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character (len=100) :: filename
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do foo=1, 10
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call build_a_field(800, 600, planet)
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planet%posy = planet%posy + 51.45
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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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subroutine build_a_field(szx, szy, moon)
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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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integer :: ix, iy
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real :: fx, fy
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real :: grav, maxi, mini
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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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do ix=1, szx
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fx = real(ix)
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do iy=1, szy
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fy = real(iy)
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grav = compute_gravity(ix, iy, moon) / 2180800.0
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field(ix,iy) = grav
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enddo
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enddo
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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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!-
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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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@ -6,7 +6,8 @@ module realfield
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implicit none
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!-----------------------------------------------------------------------
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! definition of structures
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!
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type massbody
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real :: posx, posy
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real :: mass = 1.0
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@ -17,23 +18,20 @@ end type
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contains
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!-----------------------------------------------------------------------
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function compute_gravity(ix, iy, body)
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integer, intent(in) :: ix, iy
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function compute_gravity(fx, fy, body)
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real, intent(in) :: fx, fy
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type(massbody), intent(in) :: body
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real :: compute_gravity
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real :: rx, ry, dist
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rx = real(ix) - body%posx
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ry = real(iy) - body%posy
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rx = fx - body%posx
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ry = fy - body%posy
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dist = sqrt( (rx*rx) + (ry*ry) )
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if (dist .LT. 0.15) then
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if (dist .LT. 4.50) then
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write (0, *) "dist too small ", dist
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compute_gravity = 0e0
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endif
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compute_gravity = body%mass * (dist ** 2)
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compute_gravity = body%mass / (dist ** 2)
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end function
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@ -4,4 +4,7 @@ set -e # stop on error
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make essai
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time ./essai
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./essai
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convert -delay 10 WS/*.pgm foo.gif
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