#!/bin/bash

# number to start with to call the original files (usually not changed)
COUNT=1

# number to start with to name the new files (usually not changed)
COUNT2=1

# total number of original files
OTOTAL=250

# total number of end files
ETOTAL=250

# angle of the pictures in the first file
ANGLE=0

while [ $COUNT -le $OTOTAL ]; do

if [ $COUNT -lt $OTOTAL ]; then
    VAR=`printf "%03d" $COUNT`

elif [ $COUNT -eq $OTOTAL ]; then
    COUNT=0
    VAR=$OTOTAL

fi

# An image sequence is cut into a 4x4 array and pasted over the same sequence. The 4x4 array is comprised of 
# circular transparent masks which rotate 360 degrees.

convert $VAR.png \( \( \( \( transparentwhite.png \( $VAR.png -crop 180x144+0+0 -rotate $ANGLE \) -gravity center -compose src-in -composite  \) -matte -background none \( transparentwhite.png \( $VAR.png +gravity -crop 180x144+180+0 -rotate $ANGLE \) -gravity center -compose src-in -composite  \) -matte -background none  \( transparentwhite.png \( $VAR.png +gravity -crop 180x144+360+0 -rotate $ANGLE \) -gravity center -compose src-in -composite \) -matte -background none  \( transparentwhite.png \( $VAR.png +gravity -crop 180x144+540+0 -rotate $ANGLE \) -gravity center -compose src-in -composite \) -matte -background none \)  +append \) \( \( \( transparentwhite.png \( $VAR.png +gravity -crop 180x144+0+144 -rotate $ANGLE \) -gravity center -compose src-in -composite  \) -matte -background none \( transparentwhite.png \( $VAR.png +gravity -crop 180x144+180+144 -rotate $ANGLE \) -gravity center -compose src-in -composite  \) -matte -background none  \( transparentwhite.png \( $VAR.png +gravity -crop 180x144+360+144 -rotate $ANGLE \) -gravity center -compose src-in -composite \) -matte -background none  \( transparentwhite.png \( $VAR.png +gravity -crop 180x144+540+144 -rotate $ANGLE \) -gravity center -compose src-in -composite \) -matte -background none \)  +append \) \( \( \( transparentwhite.png \( $VAR.png +gravity -crop 180x144+0+288 -rotate $ANGLE \) -gravity center -compose src-in -composite  \) -matte -background none \( transparentwhite.png \( $VAR.png +gravity -crop 180x144+180+288 -rotate $ANGLE \) -gravity center -compose src-in -composite  \) -matte -background none  \( transparentwhite.png \( $VAR.png +gravity -crop 180x144+360+288 -rotate $ANGLE \) -gravity center -compose src-in -composite \) -matte -background none  \( transparentwhite.png \( $VAR.png +gravity -crop 180x144+540+288 -rotate $ANGLE \) -gravity center -compose src-in -composite \) -matte -background none \)  +append \) \( \( \( transparentwhite.png \( $VAR.png +gravity -crop 180x144+0+432 -rotate $ANGLE \) -gravity center -compose src-in -composite  \) -matte -background none \( transparentwhite.png \( $VAR.png +gravity -crop 180x144+180+432 -rotate $ANGLE \) -gravity center -compose src-in -composite  \) -matte -background none  \( transparentwhite.png \( $VAR.png +gravity -crop 180x144+360+432 -rotate $ANGLE \) -gravity center -compose src-in -composite \) -matte -background none  \( transparentwhite.png \( $VAR.png +gravity -crop 180x144+540+432 -rotate $ANGLE \) -gravity center -compose src-in -composite \) -matte -background none \)  +append \)  -append \) -compose src-over -composite movie/$VAR2.png

echo $VAR2

let COUNT=COUNT+1

#add to angle so that picture rotates 360 degrees during animation
ANGLE=$(echo "scale=2; $ANGLE + 360 / $ETOTAL" | bc)

if [ $COUNT2 -le $ETOTAL ]; then
    VAR2=`printf "%04d" $COUNT2`

elif [ $COUNT2 -gt $ETOTAL ]; then
break

fi

let COUNT2=COUNT2+1

done