content_uncoded_image.rb

def create_thumbnail(addendum, new_width, new_height)
    width, height = get_resolution
    logger.debug "width=#{width}, height=#{height}"
    needs_resize = (new_width < width) && (new_height < height)
    ratio = new_width.to_f / new_height.to_f # Watch out for the floats
    if needs_resize
      logger.debug "needs rez"
      # NEW FORMULA
      # First step crops a rectangle proportional to new dimensions from the center of the original image
      # After that, new rectangle is resized to fit new dimensions
      if width > height
        logger.debug "ancha de caderas"
        current_height = height
        current_width = current_height * ratio
        top = 0
        left = width/2 - current_width/2
      elsif height > width
        logger.debug "estrecha y altota"
        current_width = width
        current_height = current_width / ratio
        left = 0
        top = height/2 - current_height/2
      else
        logger.debug "chica barrilín"
        current_width = width
        current_height = current_width / ratio
        left = 0
        top = (height-current_height)/2
      end
      logger.debug "left=#{left}, top=#{top}, current_w=#{current_width}, current_h=#{current_height} ratio=#{ratio}"
    thumb = @image.crop(top, left, current_width, current_height).scale(new_width, new_height)
    else
      thumb = @image.first
    end
    thumb.write("#{get_filename_base}#{addendum}.#{get_extension}") 
  end