#!/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=500

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

# start X position of picture (half of original image width + 20)
XVALUE=200

# saves original xvalue for use in x position calculation
GVALUE=$XVALUE

while [ $COUNT -le $OTOTAL ]; do


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

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

fi

# repage to put the center of the rotation in the middle of the original picture. use $angle to calculate affine rotation.
# crop creates pal background $xvalue determines current x position of the rotating picture. 
convert $VAR.jpg -repage -180-144  -affine `affine_rotate $ANGLE` -transform  -compose copy  +compose -crop 720x576$XVALUE2-288\! -background lightblue -flatten  movie/long_moving_affine_$VAR2.jpg

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)

#add to x position so that the picture moves across the background during animation
#Distance to travel is total width of background plus foreground image (so it can't be seen at start and finish) 
XVALUE=$(echo "scale=2; $XVALUE - (2 * $GVALUE + 720) / $ETOTAL" | bc)

XVALUE2=`printf "%+f" $XVALUE`

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

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

fi

let COUNT2=COUNT2+1

done