Class: Quilt::Identicon

Inherits:
Object
  • Object
show all
Defined in:
lib/quilt.rb

Constant Summary collapse

PATCHES = 
[
 [0, 4, 24, 20, 0],
 [0, 4, 20, 0],
 [2, 24, 20, 2],
 [0, 2, 22, 20, 0],
 [2, 14, 22, 10, 2],
 [0, 14, 24, 22, 0],
 [2, 24, 22, 13, 11, 22, 20, 2],
 [0, 14, 22, 0],
 [6, 8, 18, 16, 6],
 [4, 20, 10, 12, 2, 4],
 [0, 2, 12, 10, 0],
 [10, 14, 22, 10],
 [20, 12, 24, 20],
 [10, 2, 12, 10],
 [0, 2, 10, 0],
 [],
]
CENTER_PATCHES = 
[0, 4, 8, 15]
PATCH_SIZE = 
5
@@image_lib = 
ImageRmagick
@@salt = 
''

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(str = '', opt = {}) ⇒ Identicon

Returns a new instance of Identicon.



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# File 'lib/quilt.rb', line 125

def initialize str = '', opt = {}
  case opt[:type]
  when :code
    @code = str.to_i
  when :ip
    @code = Identicon.ip2code str
  else
    @code = Identicon.calc_code str.to_s
  end
  @decode = decode @code

  if opt[:size]
    @scale = opt[:size].to_f / (PATCH_SIZE * 3)
  else
    @scale = opt[:scale] || 1
  end

  @patch_width = PATCH_SIZE * @scale
  @image = @@image_lib.new @patch_width * 3, @patch_width * 3
  @back_color = @image.color 255, 255, 255
  @fore_color = @image.color @decode[:red], @decode[:green], @decode[:blue]
  @image.transparent @back_color
  render
end

Instance Attribute Details

#code ⇒ Object (readonly)

Returns the value of attribute code.



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# File 'lib/quilt.rb', line 123

def code
  @code
end

Class Method Details

.calc_code(str) ⇒ Object 



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# File 'lib/quilt.rb', line 229

def self.calc_code str
  extract_code Identicon.digest(str)
end

.digest(str) ⇒ Object 



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# File 'lib/quilt.rb', line 238

def self.digest str
  Digest::SHA1.digest(str + @@salt)
end

.extract_code(list) ⇒ Object 



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# File 'lib/quilt.rb', line 242

def self.extract_code list
  if list.respond_to? :getbyte
    tmp = [list.getbyte(0) << 24, list.getbyte(1) << 16,
           list.getbyte(2) << 8, list.getbyte(3)]
  else
    tmp = [list[0].to_i << 24, list[1].to_i << 16,
           list[2].to_i << 8, list[3].to_i]
  end
  tmp.inject(0) do |r, i|
    r | ((i[31] == 1) ? -(i & 0x7fffffff) : i)
  end
end

.image_lib ⇒ Object 



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# File 'lib/quilt.rb', line 259

def self.image_lib
  @@image_lib
end

.image_lib=(image_lib) ⇒ Object 



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# File 'lib/quilt.rb', line 255

def self.image_lib= image_lib
  @@image_lib = image_lib
end

.ip2code(ip) ⇒ Object 



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# File 'lib/quilt.rb', line 233

def self.ip2code ip
  code_ip = extract_code(ip.split('.'))
  extract_code Identicon.digest(code_ip.to_s)
end

.salt ⇒ Object 



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# File 'lib/quilt.rb', line 267

def self.salt
  @@salt
end

.salt=(salt) ⇒ Object 



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# File 'lib/quilt.rb', line 263

def self.salt= salt
  @@salt = salt
end

Instance Method Details

#decode(code) ⇒ Object 



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# File 'lib/quilt.rb', line 150

def decode code
  {
    :center_type   => (code & 0x3),
    :center_invert => (((code >> 2) & 0x01) != 0),
    :corner_type   => ((code >> 3) & 0x0f),
    :corner_invert => (((code >> 7) & 0x01) != 0),
    :corner_turn   => ((code >> 8) & 0x03),
    :side_type     => ((code >> 10) & 0x0f),
    :side_invert   => (((code >> 14) & 0x01) != 0),
    :side_turn     => ((code >> 15) & 0x03),
    :red   => (((code >> 16) & 0x01f) << 3),
    :green => (((code >> 21) & 0x01f) << 3),
    :blue  => (((code >> 27) & 0x01f) << 3),
  }
end

#draw(opt = {}) ⇒ Object 



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# File 'lib/quilt.rb', line 187

def draw opt = {}
  x = opt[:x] * @patch_width
  y = opt[:y] * @patch_width
  patch = opt[:patch] % PATCHES.size
  turn = opt[:turn] % 4

  if opt[:invert]
    fore, back = @back_color, @fore_color
  else
    fore, back = @fore_color, @back_color
  end
  @image.fill_rect(x, y, x + @patch_width - 1, y + @patch_width - 1, back)

  points = []
  PATCHES[patch].each do |pt|
    dx = pt % PATCH_SIZE
    dy = pt / PATCH_SIZE
    len = @patch_width - 1
    px = dx.to_f / (PATCH_SIZE - 1) * len
    py = dy.to_f / (PATCH_SIZE - 1) * len

    case turn
    when 1
      px, py = len - py, px
    when 2
      px, py = len - px, len - py
    when 3
      px, py = py, len - px
    end
    points << [x + px, y + py]
  end
  @image.polygon points, fore
end

#draw_patches(list, patch, turn, invert) ⇒ Object 



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# File 'lib/quilt.rb', line 179

def draw_patches list, patch, turn, invert
  list.each do |i|
    draw(:x => i[0], :y => i[1], :patch => patch,
         :turn => turn, :invert => invert)
    turn += 1
  end
end

#render ⇒ Object 



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# File 'lib/quilt.rb', line 166

def render
  center = [[1, 1]]
  side   = [[1, 0], [2, 1], [1, 2], [0, 1]]
  corner = [[0, 0], [2, 0], [2, 2], [0, 2]]

  draw_patches(center, CENTER_PATCHES[@decode[:center_type]],
               0, @decode[:center_invert])
  draw_patches(side, @decode[:side_type],
               @decode[:side_turn], @decode[:side_invert])
  draw_patches(corner, @decode[:corner_type],
               @decode[:corner_turn], @decode[:corner_invert])
end

#to_blob ⇒ Object 



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# File 'lib/quilt.rb', line 225

def to_blob
  @image.to_blob
end

#write(path = "#{@code}.png") ⇒ Object 



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# File 'lib/quilt.rb', line 221

def write path = "#{@code}.png"
  @image.write path
end