require 'RMagick'
include Magick

class ImageController < ApplicationController

  #
  # Simple example generating an image with each browser request
  #
  def generate
    fill = Magick::GradientFill.new(0, 0, 0, 0, '#d33', '#f99')
    canvas = Magick::Image.new(400, 300,fill)
    canvas.format = "PNG"
  
    text = Magick::Draw.new
    text.pointsize = 25
    text.font_weight = Magick::BoldWeight
    text.gravity = Magick::CenterGravity
    text.fill='black'
     
    text.annotate(canvas, 0,0,2,2, "Ruby Meetup at #{Time.now.strftime('%I:%M:%S %p')}")
     
    send_data canvas.to_blob, :type => 'image/png'
  end

  #
  # Simple example of caching a generated image on the file system
  #
  def generate_and_cache
    directory='public/image_gen'
    path=File.join(directory, 'test.png')
    
    # make sure the directory exists
    FileUtils.mkdir_p directory if ! File.exists? directory
      
    # create the image if it doesn't exist  
    if !File.exist?(path)

      canvas = Magick::Image.new(500, 200,
                    Magick::HatchFill.new('white','lightcyan2'))
      
      text = Magick::Draw.new
      text.annotate(canvas, 0, 0, 0, 40, (Time.now.strftime("%m/%d %I:%M:%S %p"))) {
          self.gravity = Magick::SouthWestGravity
          self.pointsize = 25
          self.fill = 'black'
          }
      
      canvas.write(path)      
    end
    
    # send the image to the browser
    send_file path, :type => 'image/png', :disposition => 'inline'
  end


  #
  # Image Manipulation
  #
  def rotate
    # load an existing image
    image = Magick::ImageList.new("public/image_gen/iphone.gif")
    
    # manipulate it and send it to the browser
    image = image.rotate(params[:degrees].to_i)
    send_data image.to_blob, :type => 'image/gif'
  end
  
end