trying to make a gif89a...

Fraktalism/.gitignore

@@ -2,3 +2,4 @@
 julia
 
 *.pgm
+*.gif

Fraktalism/fraktals.f90

@@ -3,24 +3,24 @@ module fraktals
   contains
 
 !-----------------------------------------------------
-subroutine simple_julia(pic, cx, cy)
+subroutine simple_julia(pic, cx, cy, maxiter)
     implicit none
     integer, intent(inout), dimension (:,:)  ::  pic
     real, intent(in)                         ::  cx, cy
+    integer, intent(in)                      ::  maxiter
 
     integer      ::  ix, iy, width, height
     real         ::  fx, fy
     complex      ::  Z, C
-    integer      ::  iter, maxiter
+    integer      ::  iter
 
     width  = ubound(pic, 1)
     height = ubound(pic, 2)
-    print *, "image size : ", width, height
+    ! print *, "image size : ", width, height
     ! print *, "constante  : ", cx, cy
 
-    maxiter = 500
     C = complex(cx, cy)
-    print *, "C = ", C
+    ! print *, "C = ", C
 
     do ix = 1, width
       fx = (float(ix) / (float(width)/4.0) - 2.0)

Fraktalism/julia.f90

@@ -12,18 +12,20 @@ program julia
 
     integer, dimension(640, 480)    ::    picz
     integer                         ::    argc
-    character(200)                  ::    filename
+    character(200)                  ::    filename, string
+    real                            ::    cx, cy
 
     argc = IARGC()
-
-    if (1 .NE. argc) then
-      STOP ": JULIA PROGGY NEED A FILENAME"
+    if (3 .NE. argc) then
+      STOP ": JULIA PROGGY NEED PARAMETERS"
     endif
 
     call getarg(1, filename)
+    call getarg(2, string)       ;   read (string, *) cx
+    call getarg(3, string)       ;   read (string, *) cy
 
-    call simple_julia(picz, 0.3, 0.6)
-    call spit_as_pgm(picz, trim(filename))
+    call simple_julia(picz, cx, cy, 120)
+    call spit_as_pgm_8(picz, trim(filename))
 
 end program
 

Fraktalism/mkjuliagif.sh

@@ -0,0 +1,18 @@
+#!/bin/bash
+
+for foo in $(seq 0 39)
+do
+
+	img=$(printf "frames/%05d.pgm" $foo)
+	bar=$(echo "$foo / 147.0"      | bc -l)
+	cx=$(echo "0.4 * c($foo)"     | bc -l)
+	cy=$(echo "0.4 * s($foo*2)"   | bc -l)
+
+	./julia $img $cx $cy
+
+done
+
+echo ; echo "Encoding, please wait..."
+
+convert -delay 10 frames/*.pgm foo.gif
+

Fraktalism/spitpgm.f90

@@ -8,8 +8,6 @@ module spitpgm
 
 subroutine spit_as_pgm(pic, fname)
 
-    ! implicit none
-
     integer, intent(in), dimension (:,:)  ::  pic
     character (len=*), intent(in)         ::  fname
 
@@ -25,7 +23,6 @@ subroutine spit_as_pgm(pic, fname)
     write (io, '(i0)') 65535
 
     foo = MAXVAL(pic)
-
     if (foo .EQ. 0) then
         print *, " IS SOMETHING WRONG GOING TO HAPPEN ?"
         do ix = 1, size(pic)
@@ -41,7 +38,33 @@ subroutine spit_as_pgm(pic, fname)
             end do
         end do
     endif
+    close(io)
 
+end subroutine
+!-----------------------------------------------------
+subroutine spit_as_pgm_8(pic, fname)
+
+    integer, intent(in), dimension (:,:)  ::  pic
+    character (len=*), intent(in)         ::  fname
+
+    integer   :: io, foo
+    integer   :: ix, iy
+
+    print *, "> spit_as_pgm_8 to ", fname
+    foo = MAXVAL(pic)
+    print *, "      max = ", foo
+    open(newunit=io, file=fname)
+    write (io, '(a2)') "P2"
+    write (io, '(i0," ",i0)')  size(pic, 1), size(pic, 2)
+    write (io, '(i0)') 255
+
+    do iy=1,ubound(pic, 2)
+      do ix=1, ubound(pic, 1)
+        foo = pic(ix, iy)
+        if (foo .GT. 255)  foo = 255
+        write(io, "(i3)") foo
+      enddo
+    enddo
     close(io)
 
 end subroutine