Class: RubyDzi

Inherits:
Object
  • Object
show all
Includes:
Magick
Defined in:
lib/ruby_dzi.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(image_path) ⇒ RubyDzi

Returns a new instance of RubyDzi.



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# File 'lib/ruby_dzi.rb', line 29

def initialize(image_path)

  #set defaults
  @quality = 75
  @dir = '.'
  @tile_size = 254
  @overlap = 1
  @output_ext = 'dzi'

  @image_path = image_path

end

Instance Attribute Details

#dir ⇒ Object

Returns the value of attribute dir.



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# File 'lib/ruby_dzi.rb', line 27

def dir
  @dir
end

#format ⇒ Object

Returns the value of attribute format.



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# File 'lib/ruby_dzi.rb', line 27

def format
  @format
end

#image_path ⇒ Object

Returns the value of attribute image_path.



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# File 'lib/ruby_dzi.rb', line 27

def image_path
  @image_path
end

#name ⇒ Object

Returns the value of attribute name.



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# File 'lib/ruby_dzi.rb', line 27

def name
  @name
end

#output_ext ⇒ Object

Returns the value of attribute output_ext.



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# File 'lib/ruby_dzi.rb', line 27

def output_ext
  @output_ext
end

#overlap ⇒ Object

Returns the value of attribute overlap.



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# File 'lib/ruby_dzi.rb', line 27

def overlap
  @overlap
end

#quality ⇒ Object

Returns the value of attribute quality.



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# File 'lib/ruby_dzi.rb', line 27

def quality
  @quality
end

#tile_size ⇒ Object

Returns the value of attribute tile_size.



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# File 'lib/ruby_dzi.rb', line 27

def tile_size
  @tile_size
end

Instance Method Details

#generate!(name, format = 'jpg') ⇒ Object 



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# File 'lib/ruby_dzi.rb', line 42

def generate!(name, format = 'jpg')
  @name = name
  @format = format
  
  @levels_root_dir     = File.join(@dir, @name + '_files')
  @xml_descriptor_path = File.join(@dir, @name + '.' + @output_ext)

  image = get_image(@image_path)
  
  image.strip! # remove meta information

  orig_width, orig_height = image.columns, image.rows

  remove_files!

  # iterate over all levels (= zoom stages)
  max_level(orig_width, orig_height).downto(0) do |level|
    width, height = image.columns, image.rows
    puts "level #{level} is #{width} x #{height}"
    
    current_level_dir = File.join(@levels_root_dir, level.to_s)
    FileUtils.mkdir_p(current_level_dir)
    
    # iterate over columns
    x, col_count = 0, 0
    while x < width      
      # iterate over rows
      y, row_count = 0, 0
      while y < height          
        dest_path = File.join(current_level_dir, "#{col_count}_#{row_count}.#{@format}")
        tile_width, tile_height = tile_dimensions(x, y, @tile_size, @overlap)
        
        save_cropped_image(image, dest_path, x, y, tile_width, tile_height, @quality)
        
        y += (tile_height - (2 * @overlap))
        row_count += 1
      end
      x += (tile_width - (2 * @overlap))
      col_count += 1
    end
    
    image.resize!(0.5)
  end

  # generate xml descriptor and write file
  write_xml_descriptor(@xml_descriptor_path,
                       :tile_size => @tile_size,
                       :overlap   => @overlap,
                       :format    => @format,
                       :width     => orig_width,
                       :height    => orig_height)
end

#remove_files! ⇒ Object 



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# File 'lib/ruby_dzi.rb', line 95

def remove_files!
  files_existed = (File.file?(@xml_descriptor_path) or File.directory?(@levels_root_dir))

  File.delete @xml_descriptor_path if File.file? @xml_descriptor_path
  FileUtils.remove_dir @levels_root_dir if File.directory? @levels_root_dir

  return files_existed
end