nice work done on Julia set

Fraktalism/encode.sh

@@ -12,13 +12,34 @@ SDIR="$1"
 FNAME="$2"
 echo "Encoding from " $SDIR " to " $FNAME
 
+#
+#  trying to guess the format of inoput files
+#
+firstfile=$(ls -1 $SDIR/* | head -1)
+echo "first file :" $firstfile
+filetype=$(file $firstfile | awk '{ print $2 }')
+echo "file type  :" $filetype
+
+#
+# this is BOGUS, replace file by identify ?
+#
+case  $filetype in
+        PNG)            extension=".png"                ;;
+        Netpbm)         extension=".pgm"                ;;
+        *)              extension=".binary"             ;;
+esac
+echo "extension  :" $extension
+
+
+
 TITLE='---{ experimental }---'
 
 ffmpeg  -nostdin					\
 	-loglevel warning				\
-	-y -r 25 -f image2 -i $SDIR/%05d.png 		\
+	-y -r 30 -f image2 -i $SDIR/%05d.pnm 		\
 	-metadata artist='---{ tTh }---'		\
 	-metadata title="${TITLE}"			\
+ 	-preset veryslow				\
 	-c:v libx264 -pix_fmt yuv420p			\
 	$FNAME
 

Fraktalism/julias.f90

@@ -13,7 +13,7 @@ subroutine simple_julia(pic, cx, cy, maxiter)
     integer, intent(in)                      ::  maxiter
 
     integer      ::  ix, iy, width, height
-    real         ::  fx, fy, fv
+    real         ::  fx, fy
     complex      ::  Z, C
     integer      ::  iter
     logical      ::  over_iter
@@ -49,4 +49,49 @@ subroutine simple_julia(pic, cx, cy, maxiter)
 
 end subroutine simple_julia
 !===============================================================
+subroutine julia_colormapped(pic, cx, cy, maxiter)
+    use pixrgb
+    type(t_pixrgb), 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
+    logical      ::  over_iter
+
+    width  = ubound(pic, 1)
+    height = ubound(pic, 2)
+    C = complex(cx, cy)
+    print *, "Color julia, const = ", C
+    do ix = 1, width
+      fx = (float(ix) / (float(width*2)/4.0) - 1.0)
+      do iy = 1, height
+        fy = (float(iy) / (float(height*2)/4.0) - 1.0)
+          ! ------ traitement du pixel
+          iter = 0  ; over_iter = .FALSE.
+          Z = complex(fx, fy)
+          do while ((real(Z)*real(Z) + imag(Z)*imag(Z)) .LT. 4.0) 
+            Z = (Z * Z) + C
+            iter = iter + 1
+            if (iter .GE. maxiter) then
+              over_iter = .TRUE.
+              exit
+            endif
+          end do
+          if (over_iter) then
+            pic(ix, iy)%r = 0
+            pic(ix, iy)%g = mod(abs(int(real(Z) *140)), 255)
+            pic(ix, iy)%b = mod(abs(int(aimag(Z)*140)), 255)
+          else
+            pic(ix, iy)%r = mod(iter*33, 255)
+            pic(ix, iy)%g = mod(iter*29, 255)
+            pic(ix, iy)%b = mod(iter*21, 255)
+          endif
+      enddo      ! iy
+    enddo        ! ix
+
+end subroutine 
+!===============================================================
 end module

Fraktalism/mkjulia.f90

@@ -8,10 +8,11 @@ program julia
 
     use spitpgm
     use JULIAS
+    use PIXRGB
 
     implicit none
 
-    integer, dimension(640, 480)    ::    picz
+    type(t_pixrgb), allocatable     ::    picz(:,:)
     integer                         ::    argc
     character(200)                  ::    filename, string
     real                            ::    cx, cy
@@ -25,8 +26,10 @@ program julia
     call getarg(2, string)       ;   read (string, *) cx
     call getarg(3, string)       ;   read (string, *) cy
 
-    call simple_julia(picz, cx, cy, 3500)
-    call spit_as_pgm_8(picz, trim(filename))
+    allocate(picz(640, 480))
+
+    call julia_colormapped(picz, cx, cy, 500)
+    call rgbpix_spit_as_pnm_8(picz, trim(filename))
 
 end program
 

Fraktalism/mkjuliagif.sh

@@ -14,20 +14,23 @@ fi
 #
 #	run the prog
 #
-for foo in $(seq 0 99)
+workdir="frames/julia/"
+for foo in $(seq 0 179)
 do
 
-	img=$(printf "frames/julia/%05d.pgm" $foo)
+	img=$(printf "%s/%05d.pnm" $workdir $foo)
 	bar=$(echo "$foo / 247.0"			| bc -l)
-	cx=$(echo "0.7 * (2.72*c($foo/3))"		| bc -l)
-	cy=$(echo "0.5 * (1.45+s($foo/2))"		| bc -l)
+	cx=$(echo "0.5 * (1.52*c($foo/28.0))"		| bc -l)
+	cy=$(echo "0.5 * (1.45*s($foo/17.0))"		| bc -l)
 
 	./mkjulia $img $cx $cy
 
 done
 
+./tagpicz.sh $workdir
+
 echo ; echo "Encoding, please wait..."
 
-convert -delay 10 frames/julia/*.pgm foo.gif
+convert -delay 10 $workdir/*.pnm color-julia.gif
 # animate foo.gif &
 

Fraktalism/tagpicz.sh

@@ -0,0 +1,27 @@
+#!/bin/bash
+
+#
+#	THIS IS JUST A QUICK'N'DIRTY HACK !
+#	       DO NOT USE IT IN REAL LIFE !
+#
+
+set -e
+
+SDIR="frames/spool/"
+if [ $# -eq 1 ] ; then
+	SDIR="$1"
+fi
+
+for img in $SDIR/*.pnm
+do
+
+	mogrify					\
+		-gravity South-East		\
+		-font Courier			\
+		-pointsize 12			\
+		-fill Yellow			\
+		-annotate +10+10 "tTh 2023"	\
+		$img
+	echo "tagging " $img
+
+done