Basic insert text on image via imagemagick

davos.rb

class Davos
  #require 'RMagick'
  include Magick
  
  
  
  def self.for(user, message)
    bottle_composition = create_composition(user, message)
    bottle_file = Tempfile.new("composite-for-#{user.fbid}.jpg")
    bottle_composition.write(bottle_file.path)
    
    BPLogger.debug(bottle_file.path)
    
    #File.delete(bottle_file.path) if File.exists?(bottle_file.path)
    return bottle_file.path
  end
  
  private
  
  def self.create_composition(user, message)
    image_base_src = File.join(Rails.root, "app/assets/images/bottle.jpg")
    bottle_image = Magick::ImageList.new(image_base_src)
    bi = Davos.insert_message(bottle_image, 0, 0, message)
    return bi
  end
  
  def self.insert_message(current_image, x_pos, y_pos, message)
    bm = Draw.new
    current_image.annotate(bm, 300, 200, 100, 20, message){
      bm.gravity = Magick::NorthWestGravity
      bm.pointsize = 20
      bm.fill = "#000000"
      bm.stroke = 'transparent'
      bm.font_weight = Magick::BoldWeight
    }

    return current_image
  end
  
end