#!/bin/bash

#file number to start with
COUNT=1

# total number of original files
OTOTAL=99

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

# loop to call up the files to process. calls up files numbered from 000-999 in accending order
while [ $COUNT -le $OTOTAL ]; do

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

fi 

#append the jpgs counting from 001-099 into 2x2 square jpeg with the numbers 001-099
#resize the file. rotate them by the current angle

montage \( montage/container/$VAR.jpg -rotate $ANGLE \) \( montage/altona/$VAR.jpg -rotate $ANGLE \) \( montage/hans/$VAR.jpg -rotate $ANGLE \) \( montage/platte/$VAR.jpg -rotate $ANGLE \) -tile 2x2 -geometry 360x288!+1+1 montage_$VAR.jpg

#add 1 to the number of the last runthrough
let COUNT=COUNT+1

#calculate the angle for the current runthrough. current angle + 3.65. For 99 files this will complete a 360
ANGLE=$(echo "scale=2; $ANGLE + 3.64" | bc)

done