square_thumb.rb

# -*- coding: utf-8 -*-
# referred to
# http://thesteve.org/technoblarg/2011/10/01/square-thumbnails-with-minimagick/
require 'mini_magick'

module MiniMagick
  class Image
    def self.square(src, dst, size)
      thumb = open src
      thumb.square dst, size
    end

    def square(dst, size = 100)
      combine_options do |c|
        c.auto_orient
        c.thumbnail "x#{size*2}"
        c.resize "#{size*2}x<"
        c.resize "50%"
        c.gravity "center"
        c.crop "#{size}x#{size}+0+0"
        c.quality "92"
      end
      write(dst)
    end
  end
end