diff --git a/GrafAnim/.gitignore b/GrafAnim/.gitignore
index 3f5b0b4..1558a08 100644
--- a/GrafAnim/.gitignore
+++ b/GrafAnim/.gitignore
@@ -1,3 +1,7 @@
 
 essai
 
+*.scratch
+*.tga
+F/*.tga
+*.gif
diff --git a/GrafAnim/F/README.md b/GrafAnim/F/README.md
new file mode 100644
index 0000000..732aad1
--- /dev/null
+++ b/GrafAnim/F/README.md
@@ -0,0 +1,3 @@
+
+# This is juste a workspace
+
diff --git a/GrafAnim/Makefile b/GrafAnim/Makefile
index d6fbd53..bb5ea2b 100644
--- a/GrafAnim/Makefile
+++ b/GrafAnim/Makefile
@@ -2,7 +2,7 @@
 # Fortraneries by tTh - Graf Anim
 #
 
-GFOPT = -Wall -Wextra -g -time
+GFOPT = -Wall -Wextra -g -time 
 
 essai:	essai.f90 usegenplot.o Makefile
 	gfortran $(GFOPT) $< usegenplot.o -o $@
diff --git a/GrafAnim/README.md b/GrafAnim/README.md
index 8ffac47..3e3abd7 100644
--- a/GrafAnim/README.md
+++ b/GrafAnim/README.md
@@ -1,5 +1,6 @@
 # GrafAnim
 
 Quelques essais approximatifs pour faire des graphiques inutiles,
-dans une démarche mettant en avant la techno-futilité
+dans une démarche mettant en avant la techno-futilité, une notion
+bien définie par le collectif Interhack.
 
diff --git a/GrafAnim/essai.f90 b/GrafAnim/essai.f90
index 95c67df..1293cae 100644
--- a/GrafAnim/essai.f90
+++ b/GrafAnim/essai.f90
@@ -1,13 +1,43 @@
 program essai
-
   use usegenplot
   implicit none
 
-  ! integer                     :: foo, bar
+  integer                   :: foo, bar
+  integer                   :: nbarg
+  integer                   :: numframe = 1
+  character(len=32)         :: arg
 
-  write(0, *)   "------------ essai graf anim ---------------"
+  ! write(0, *)   "------------ essai graf anim ---------------"
 
-  call init_genplot('essai.genplot')
+  nbarg = IARGC()
+  if (nbarg .GT. 0) then
+       call GETARG(1, arg)
+       write (0, '(A40, A5)') "argument = ",  arg
+       read (arg, *) numframe
+  endif
+
+  write(0, '(A40, I5)')  "frame number =", numframe
+
+  call init_genplot("essai.genplot")
+  ! call do_frame(7)
+
+  bar = (numframe * 20) - 160 
+  do foo=20, 620, 40
+    call gplt_line(foo, 20, bar, 460)
+    call gplt_line(bar, 20, foo, 460)
+  enddo
+
+contains        !------------------------------------------
+
+subroutine do_frame(color)
+  integer, intent(in)           :: color
+
+  call gplt_line(  0,   0, 640,   0)
+  call gplt_line(  0, 480, 640, 480)
+  call gplt_line(  0,   0,   0, 480)
+  call gplt_line(640,   0, 640, 480)
+
+end subroutine
 
 end program
 
diff --git a/GrafAnim/go.sh b/GrafAnim/go.sh
index eb622cd..d998bc8 100755
--- a/GrafAnim/go.sh
+++ b/GrafAnim/go.sh
@@ -4,3 +4,14 @@ set -e
 
 make essai
 
+for foo in $(seq 0 89)
+do
+	./essai $foo > a.scratch
+	fname=$(printf "F/%04d.tga" $foo)
+	echo $fname
+	genplot2 a.scratch $fname
+
+done
+
+convert -delay 10 F/????.tga foo.gif
+
diff --git a/GrafAnim/usegenplot.f90 b/GrafAnim/usegenplot.f90
index 2e5d24a..0691519 100644
--- a/GrafAnim/usegenplot.f90
+++ b/GrafAnim/usegenplot.f90
@@ -7,9 +7,37 @@ module usegenplot
 
 subroutine init_genplot(filename)
 
-  character(200) :: filename
+  character(*), intent(in)    :: filename
 
-  write(0, *)   '-------- init genplot '
+  write(0, *)   '--> init genplot "', filename, '"'
+
+end subroutine
+
+! -------------------------------------------------------------------
+
+subroutine gplt_move(x, y)
+   integer, intent(in)          :: x, y
+   print *, x, y, 0
+end subroutine
+
+! -------------------------------------------------------------------
+
+subroutine gplt_draw(x, y)
+   integer, intent(in)          :: x, y
+   print *, x, y, 2
+end subroutine
+
+! -------------------------------------------------------------------
+
+subroutine gplt_line(x1, y1, x2, y2)
+   integer, intent(in)           :: x1, y1, x2, y2
+   call gplt_move(x1, y1)
+   call gplt_draw(x2, y2)
+end subroutine
+
+! -------------------------------------------------------------------
+subroutine gplt_rect(x1, y1, x2, y2)
+   integer, intent(in)           :: x1, y1, x2, y2! -------------------------------------------------------------------
 
 end subroutine