Module: DataMapper::FastenTheSeatBelt::InstanceMethods

Defined in:
lib/dm-fasten-the-seat-belt.rb

Instance Method Summary collapse

Instance Method Details

#absolute_path(thumb = nil) ⇒ Object 



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# File 'lib/dm-fasten-the-seat-belt.rb', line 73

def absolute_path(thumb=nil)
  File.join(complete_directory_name, filename_for_thumbnail(thumb))
end

#complete_directory_name ⇒ Object 



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# File 'lib/dm-fasten-the-seat-belt.rb', line 128

def complete_directory_name
  File.join(self.class.fasten_the_seat_belt_options[:file_system_path], directory_name)
end

#complete_file_path ⇒ Object 



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# File 'lib/dm-fasten-the-seat-belt.rb', line 132

def complete_file_path
  File.join(complete_directory_name, (self.filename || ""))
end

#create_directory ⇒ Object 



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# File 'lib/dm-fasten-the-seat-belt.rb', line 136

def create_directory
  FileUtils.mkdir_p(complete_directory_name) unless FileTest.exists?(complete_directory_name)
end

#delete_directory ⇒ Object 



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# File 'lib/dm-fasten-the-seat-belt.rb', line 140

def delete_directory 
  FileUtils.rm_rf(complete_directory_name) if FileTest.exists?(complete_directory_name)
end

#directory_name ⇒ Object 



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# File 'lib/dm-fasten-the-seat-belt.rb', line 113

def directory_name
  # you can thank Jamis Buck for this: http://www.37signals.com/svn/archives2/id_partitioning.php
  dir = ("%08d" % self.id).scan(/..../)
  File.join(dir[0], dir[1])
end

#filename_for_thumbnail(thumb = nil) ⇒ Object 



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# File 'lib/dm-fasten-the-seat-belt.rb', line 77

def filename_for_thumbnail(thumb=nil)
  if thumb != nil
    basename = self.filename.gsub(/\.(.*)$/, '')
    extension = self.filename.gsub(/^(.*)\./, '')
    return basename + '_' + thumb.to_s + '.' + extension
  else
    return self.filename
  end
end

#generate_thumbnails! ⇒ Object 



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# File 'lib/dm-fasten-the-seat-belt.rb', line 144

def generate_thumbnails!
  self.class.fasten_the_seat_belt_options[:thumbnails].each_pair do |key, value|
    resize_to = value[:size]
    quality = value[:quality].to_i
  
    image = MiniMagick::Image.from_file(complete_file_path)
    if value[:crop]
      # tw, th are target width and target height
    
      tw = resize_to.gsub(/([0-9]*)x([0-9]*)/, '\1').to_i
      th = resize_to.gsub(/([0-9]*)x([0-9]*)/, '\2').to_i
    
      # ow and oh are origin width and origin height
      ow = image[:width]
      oh = image[:height]
      
      # iw and ih and the dimensions of the cropped picture before resizing
      # there are 2 cases, iw = ow or ih = oh
      # using iw / ih = tw / th, we can determine the other values
      # we use the minimal values to determine the good case
      iw = [ow, ((oh.to_f*tw.to_f) / th.to_f)].min
      ih = [oh, ((ow.to_f*th.to_f) / tw.to_f)].min
    
      # we calculate how much image we must crop
      shave_width = ((ow.to_f - iw.to_f) / 2.0).to_i
      shave_height = ((oh.to_f - ih.to_f) / 2.0).to_i
    
  
      # specify the width of the region to be removed from both sides of the image and the height of the regions to be removed from top and bottom.
      image.shave "#{shave_width}x#{shave_height}"

      # resize of the pic
      image.resize resize_to.to_s + "!"
    else
      # no cropping
      image.resize resize_to
    end
    basename = self.filename.gsub(/\.(.*)$/, '')
    extension = self.filename.gsub(/^(.*)\./, '')

    thumb_filename = File.join(complete_directory_name, (basename + '_' + key.to_s + '.' + extension))

    # Delete thumbnail if exists
    File.delete(thumb_filename) if File.exists?(thumb_filename)
    image.write thumb_filename

    next if self.images_are_compressed == false
    
    if quality and quality!=0 and quality < 100
      compress_jpeg(thumb_filename, quality)
    end
  end
end

#path(thumb = nil) ⇒ Object

Get file path



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# File 'lib/dm-fasten-the-seat-belt.rb', line 69

def path(thumb=nil)
  File.join(web_directory_name, filename_for_thumbnail(thumb))
end

#save_attributes ⇒ Object 



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# File 'lib/dm-fasten-the-seat-belt.rb', line 87

def save_attributes
  return unless @file
  # The following line is solving an IE6 problem. This removes the C:\Documents and Settings\.. shit
  @file[:filename] = File.basename(@file[:filename].gsub(/\\/, '/')) if @file[:filename]

  # Setup attributes
  [:content_type, :size, :filename].each do |attribute|
    self.send("#{attribute}=", @file[attribute])
  end
end

#save_file ⇒ Object 



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# File 'lib/dm-fasten-the-seat-belt.rb', line 98

def save_file
  return unless self.filename and @file

  create_directory

  FileUtils.mv @file[:tempfile].path, complete_file_path if File.exists?(@file[:tempfile].path)

  generate_thumbnails!

  @file = nil

  # By default, images are supposed to be compressed
  self.images_are_compressed ||= true 
end

#web_directory_name ⇒ Object 



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# File 'lib/dm-fasten-the-seat-belt.rb', line 119

def web_directory_name
  raise "Can't return web directory name if not running in Merb" unless defined?(Merb)
  unless complete_directory_name.include?(Merb.root)
    raise "Can't return web directory name, the images aren't stored under the Merb application public directory" 
  end
  
  complete_directory_name.gsub(/^#{Merb.root}\/public/, '')
end