Class: LetterAvatar::Avatar

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

Defined Under Namespace

Classes: Identity

Constant Summary collapse

VERSION =

BUMP UP if avatar algorithm changes

2
FULLSIZE =

Largest avatar generated, one day when pixel ratio hit 3 we will need to change this

240
FILL_COLOR = 
'rgba(255, 255, 255, 0.65)'.freeze
FONT_FILENAME = 
File.join(File.expand_path('../../', File.dirname(__FILE__)), 'Roboto-Medium')

Class Method Summary collapse

Class Method Details

.cache_path ⇒ Object 



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# File 'lib/letter_avatar/avatar.rb', line 27

def cache_path
  "#{LetterAvatar.cache_base_path || 'public/system'}/letter_avatars/#{VERSION}"
end

.cached_path(identity, size) ⇒ Object 



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# File 'lib/letter_avatar/avatar.rb', line 49

def cached_path(identity, size)
  dir = "#{cache_path}/#{identity.letter}/#{identity.color.join('_')}"
  FileUtils.mkdir_p(dir)

  "#{dir}/#{size}.png"
end

.darken(color, pct) ⇒ Object 



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# File 'lib/letter_avatar/avatar.rb', line 81

def darken(color, pct)
  color.map do |n|
    (n.to_f * pct).to_i
  end
end

.fullsize_path(identity) ⇒ Object 



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# File 'lib/letter_avatar/avatar.rb', line 56

def fullsize_path(identity)
  cached_path(identity, FULLSIZE)
end

.generate(username, size, opts = nil) ⇒ Object 



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# File 'lib/letter_avatar/avatar.rb', line 31

def generate(username, size, opts = nil)
  identity = Identity.from_username(username)

  cache = true
  cache = false if opts && opts[:cache] == false

  size = FULLSIZE if size > FULLSIZE
  filename = cached_path(identity, size)

  return filename if cache && File.exist?(filename)

  fullsize = fullsize_path(identity)
  generate_fullsize(identity) if !cache || !File.exist?(fullsize)

  LetterAvatar.resize(fullsize, filename, size, size)
  filename
end

.generate_fullsize(identity) ⇒ Object 



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# File 'lib/letter_avatar/avatar.rb', line 60

def generate_fullsize(identity)
  filename = fullsize_path(identity)

  LetterAvatar.execute(
    %W(
      convert
      -size #{FULLSIZE}x#{FULLSIZE}
      xc:#{to_rgb(identity.color)}
      -pointsize 140
      -font #{FONT_FILENAME}
      -weight #{LetterAvatar.weight}
      -fill '#{LetterAvatar.fill_color}'
      -gravity Center
      -annotate #{LetterAvatar.annotate_position} '#{identity.letter}'
      '#{filename}'
    ).join(' ')
  )

  filename
end

.to_rgb(color) ⇒ Object 



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# File 'lib/letter_avatar/avatar.rb', line 87

def to_rgb(color)
  r, g, b = color
  "'rgb(#{r},#{g},#{b})'"
end