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325 lines
6.6 KiB
Ruby
325 lines
6.6 KiB
Ruby
class LetterAvatar
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# BUMP UP if avatar algorithm changes
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VERSION = 1
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# Largest avatar generated, one day when pixel ratio hit 3
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# we will need to change this
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FULLSIZE = 240
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class<<self
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class Identity
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attr_accessor :color, :letter
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def self.from_username(username)
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identity = new
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identity.color = LetterAvatar::COLORS[
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Digest::MD5.hexdigest(username)[0...15].to_i(16) % LetterAvatar::COLORS.length
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]
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identity.letter = username[0].upcase
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identity
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end
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end
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def cache_path
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"tmp/letter_avatars/#{VERSION}"
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end
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def generate(username, size, opts = nil)
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identity = Identity.from_username(username)
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cache = true
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cache = false if opts && opts[:cache] == false
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size = FULLSIZE if size > FULLSIZE
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filename = cached_path(identity, size)
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if cache && File.exists?(filename)
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return filename
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end
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fullsize = fullsize_path(identity)
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if !cache || !File.exists?(fullsize)
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generate_fullsize(identity)
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end
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OptimizedImage.resize(fullsize, filename, size, size)
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filename
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end
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def cached_path(identity, size)
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dir = "#{cache_path}/#{identity.letter}/#{identity.color.join("_")}"
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FileUtils.mkdir_p(dir)
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"#{dir}/#{size}.png"
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end
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def fullsize_path(identity)
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cached_path(identity, FULLSIZE)
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end
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def generate_fullsize(identity)
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color = identity.color
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letter = identity.letter
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filename = fullsize_path(identity)
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stroke = darken(color, 0.8)
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instructions = %W{
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-size 240x240
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xc:#{to_rgb(color)}
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-pointsize 200
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-fill white
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-gravity Center
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-font 'Helvetica'
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-stroke #{to_rgb(stroke)}
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-strokewidth 2
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-annotate -5+25 '#{letter}'
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'#{filename}'
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}
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`convert #{instructions.join(" ")}`
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filename
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end
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def darken(color,pct)
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color.map do |n|
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(n.to_f * pct).to_i
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end
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end
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def to_rgb(color)
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r,g,b = color
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"'rgb(#{r},#{g},#{b})'"
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end
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end
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# palette of optimally disctinct colors
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# cf. http://tools.medialab.sciences-po.fr/iwanthue/index.php
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# parameters used:
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# - H: 0 - 360
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# - C: 0 - 2
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# - L: 0.75 - 1.5
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COLORS = [[198,125,40],
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[61,155,243],
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[74,243,75],
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[238,89,166],
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[52,240,224],
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[177,156,155],
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[247,242,53],
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[111,154,78],
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[237,179,245],
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[237,101,95],
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[89,239,155],
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[242,233,158],
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[163,212,245],
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[65,152,142],
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[165,135,246],
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[181,166,38],
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[187,229,206],
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[77,164,25],
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[179,246,101],
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[234,93,37],
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[225,155,115],
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[142,140,188],
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[223,120,140],
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[249,174,27],
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[244,117,225],
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[137,141,102],
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[75,191,146],
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[188,239,142],
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[164,199,145],
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[173,120,149],
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[59,195,89],
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[222,198,220],
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[68,145,187],
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[236,204,179],
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[159,195,72],
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[188,121,189],
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[166,160,85],
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[181,233,37],
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[236,177,85],
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[121,147,160],
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[234,218,110],
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[241,157,191],
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[62,200,234],
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[133,243,34],
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[88,149,110],
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[226,235,237],
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[183,119,118],
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[192,247,192],
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[113,196,122],
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[197,115,70],
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[80,175,187],
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[103,231,238],
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[240,72,133],
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[228,149,241],
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[180,188,159],
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[172,132,85],
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[221,236,102],
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[236,194,58],
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[217,176,109],
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[88,244,199],
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[186,157,239],
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[113,230,96],
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[206,115,165],
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[244,178,163],
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[230,139,26],
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[241,125,89],
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[83,160,66],
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[107,190,166],
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[197,161,210],
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[198,203,245],
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[238,117,19],
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[228,119,116],
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[131,156,41],
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[145,178,168],
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[139,170,220],
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[233,95,125],
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[87,178,230],
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[157,200,119],
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[237,140,76],
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[229,185,186],
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[144,206,212],
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[236,209,158],
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[185,189,79],
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[34,208,66],
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[84,238,129],
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[133,140,134],
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[219,229,175],
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[168,179,25],
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[140,145,240],
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[151,241,125],
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[67,162,107],
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[200,156,21],
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[169,173,189],
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[226,116,189],
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[133,231,191],
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[194,161,63],
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[241,77,99],
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[241,217,53],
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[123,204,105],
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[210,201,119],
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[229,108,155],
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[240,91,72],
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[187,115,210],
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[240,163,100],
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[178,217,57],
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[179,135,116],
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[204,211,24],
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[186,135,57],
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[223,176,135],
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[204,148,151],
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[116,223,50],
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[95,195,46],
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[123,160,236],
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[181,172,131],
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[142,220,202],
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[240,140,112],
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[172,145,164],
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[228,124,45],
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[222,234,142],
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[42,205,125],
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[192,233,116],
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[119,170,114],
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[158,138,26],
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[73,190,183],
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[185,229,243],
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[227,107,55],
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[196,205,202],
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[132,143,60],
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[233,192,237],
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[62,150,220],
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[205,201,141],
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[106,140,190],
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[161,131,205],
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[226,226,75],
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[198,139,81],
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[115,171,32],
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[101,181,67],
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[149,137,119],
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[222,245,86],
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[183,130,175],
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[168,125,133],
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[124,142,87],
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[236,156,171],
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[232,194,91],
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[219,200,69],
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[144,219,34],
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[219,95,187],
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[145,154,217],
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[165,185,100],
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[127,238,163],
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[224,178,198],
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[119,153,120],
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[124,212,92],
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[172,161,105],
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[231,155,135],
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[157,132,101],
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[122,185,146],
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[53,166,51],
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[70,163,90],
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[150,190,213],
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[234,235,219],
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[166,152,185],
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[159,194,159],
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[222,242,47],
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[202,176,161],
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[95,140,229],
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[156,246,80],
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[93,170,203],
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[159,142,54],
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[185,237,230],
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[94,150,149],
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[187,206,136],
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[157,224,166],
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[235,158,208],
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[109,232,216],
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[141,201,87],
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[208,124,118],
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[142,125,214],
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[226,234,123],
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[72,219,41],
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[234,102,111],
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[168,142,79],
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[188,135,35],
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[214,233,195],
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[148,173,116],
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[223,112,95],
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[228,128,236],
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[206,114,54],
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[195,119,88],
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[235,140,94],
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[235,202,125],
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[233,155,153],
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[214,214,238],
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[246,200,35],
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[151,125,171],
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[132,145,172],
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[131,142,118],
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[199,126,150],
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[61,162,123],
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[58,176,151],
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[215,141,69],
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[225,154,220],
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[224,244,174],
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[233,161,64],
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[130,221,137],
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[81,191,129],
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[169,162,140],
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[174,177,222],
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[236,174,47],
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[196,240,159],
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[69,222,172],
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[71,232,93],
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[118,211,238],
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[157,224,83],
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[218,105,73],
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[165,241,221]]
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end
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