#!/usr/bin/env ruby
# Script to Rotate an Image
# Usage: rotateimage.rb ANGLE IMAGE (OUTPUT IMAGE)
# ANGLE can be CW, CCW, or 180
# IMAGE can be any file ImageMagick can parse
# OUTPUT IMAGE is optional - omitted it changes in place.
require 'RMagick'
include Magick

def usage()
 puts "Usage: rotateimage.rb ANGLE IMAGE (OUTPUT IMAGE)
  ANGLE can be CW, CCW, or 180
  IMAGE can be any file ImageMagick can parse
  OUTPUT IMAGE is optional - omitted it changes in place."
end
inputangle = ARGV[0]

if (inputangle == "CW")
 angle = 90
elsif (inputangle == "CCW")
 angle = -90
elsif (inputangle == "180")
 angle = 180
else
 usage()
 exit
end

image = ARGV[1]
if (!image)
 usage()
 exit
end

imagelist = ImageList.new(image)
newimage = imagelist.rotate(angle)

output = ARGV[2]
if (output)
 puts "Output Image: "+output
 newimage.write(output)
else
 puts "Output Image: "+image
 newimage.write(image)
end