#!/bin/sh
#
# Create a animation of of a rotating image.
# Some alpha composition is used to crop the result to the original size.
#
command="convert -delay 10 logo: -resize 50% -trim +repage -bordercolor blue"
command="$command \\( +clone -border 1x1 -fill lightsteelblue"
command="$command    -colorize 100% \\) -gravity center"

for i in `seq 100 -2 20 ;`; do
  command="$command \\( -clone 0 -liquid-rescale ${i}x100%\!"
  command="$command     -border 1x1 -clone 1 +swap -composite \\)"
done

# remove source images
command="$command -delete 0,1"

# duplicate frames to reverse
command="$command \\( -clone -2-1 \\)"

# write out animation
command="$command -layers Optimize -loop 0 animated_lqr.gif"

eval $command

chmod 644 animated_lqr.gif