winter is coming

GrafAnim/essai.f90

@@ -1,46 +1,92 @@
 program essai
-  use usegenplot
+
+  use pixrgb
   implicit none
 
-  integer                   :: foo, bar
   integer                   :: nbarg
-  integer                   :: numframe = 0
+  integer                   :: param0 = 10
   character(len=256)        :: arg
 
-  ! write(0, *)   "------------ essai graf anim ---------------"
+  ! integer                   :: foo, bar
+
+  integer                   :: width  = 512
+  integer                   :: height = 342
+  integer                   :: seqnum
+  real                      :: nclock, kx, ky
+  character (len=280)       :: filename
+
+  type(t_pixrgb), allocatable      :: pix(:,:)
+
+  write(0, *)   "--------- essai FLUFFYWAVES ------------"
 
   nbarg = IARGC()
   if (nbarg .GT. 0) then
        call GETARG(1, arg)
        ! write (0, '(A40, A5)') "argument = ",  arg
-       read (arg, *) numframe
+       read (arg, *) param0
   endif
 
-  write(0, '(A20, I5)')  "frame number =", numframe
+  allocate(pix(width, height))
 
-  call init_genplot("essai.genplot")
-  call do_frame(7)
+  do seqnum = 0, param0
+    nclock = float(seqnum) / float(param0)
+    call rgbpix_set_to_rgb(pix, 0, 0, 0)
 
-  call gplt_setcol(2)
+    kx = nclock * 0.35 * sin(nclock * 7.0)
+    ky = nclock * 0.95 * cos(nclock * 7.0)
+    call iterator (pix, kx, ky, 50000)
 
-  bar = (numframe * 20) - 120
-  do foo=20, 620, 50
-    call gplt_line(foo, 20, bar, 460)
-    call gplt_line(bar, 20, foo, 460)
+    write (filename, "(a, i5.5, a)") "./F/np/", seqnum, ".pnm"
+    write(0, *)  seqnum, kx, ky, trim(filename)
+    call rgbpix_spit_as_pnm_16(pix, trim(filename))
   enddo
 
-  call end_genplot("done for today")
+contains
+! ----------------------------------------------------------
+!-
+subroutine setpixel(pic, x, y)
+  implicit none
+  type(t_pixrgb), intent(inout)   :: pic(:,:)
+  real, intent(in)                :: x, y 
 
-contains        !------------------------------------------
+  integer                         :: ix, iy
 
-subroutine do_frame(color)
-  integer, intent(in)           :: color
-  integer                       :: savecol
+  ix = 600 - int (300.0 * x)
+  iy = 600 - int (300.0 * y)
 
-  savecol = gplt_getcol()
-  call gplt_setcol(color)
-  call gplt_rect(0, 0, 640, 480)
-  call gplt_setcol(savecol)
+  ! print *, ix, iy
+
+  if ( (ix .gt. lbound(pic, 1)) .and. (ix .lt. ubound(pic, 1))    &
+               .and.                                              &
+       (iy .gt. lbound(pic, 2)) .and. (iy .lt. ubound(pic, 2)) )  &
+  then
+     pic(ix, iy)%g = 65000
+     pic(ix, iy)%b = 20000
+  else
+     ! XXX write(0, *) 'out', ix, iy
+  endif
+
+end subroutine
+
+! ----------------------------------------------------------
+!-
+subroutine iterator(img, x0, y0, nbi)
+  implicit none
+  type(t_pixrgb), intent(inout)   :: img(:,:)
+  real, intent(in)                :: x0, y0
+  integer, intent(in)             :: nbi
+  real                            :: xa, ya, xb, yb
+  integer                         :: bcl
+
+  xa = x0      ;     ya = y0
+
+  do bcl=0, nbi
+    xb = xa - 0.4 * sin ( ya + sin( 0.4 * ya ) )
+    yb = ya - 0.4 * sin ( xa + sin(  -2 * xa ) )
+    call setpixel(img, xb, yb)
+    xa = xb
+    ya = yb
+  enddo
 
 end subroutine