mirror of
https://github.com/discourse/discourse.git
synced 2024-12-22 01:03:43 +08:00
326 lines
6.6 KiB
Ruby
326 lines
6.6 KiB
Ruby
class LetterAvatar
|
|
|
|
# BUMP UP if avatar algorithm changes
|
|
VERSION = 2
|
|
|
|
# Largest avatar generated, one day when pixel ratio hit 3
|
|
# we will need to change this
|
|
FULLSIZE = 240
|
|
|
|
class<<self
|
|
|
|
class Identity
|
|
attr_accessor :color, :letter
|
|
|
|
def self.from_username(username)
|
|
identity = new
|
|
identity.color = LetterAvatar::COLORS[
|
|
Digest::MD5.hexdigest(username)[0...15].to_i(16) % LetterAvatar::COLORS.length
|
|
]
|
|
identity.letter = username[0].upcase
|
|
|
|
identity
|
|
end
|
|
end
|
|
|
|
|
|
def cache_path
|
|
"tmp/letter_avatars/#{VERSION}"
|
|
end
|
|
|
|
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)
|
|
|
|
if cache && File.exists?(filename)
|
|
return filename
|
|
end
|
|
|
|
fullsize = fullsize_path(identity)
|
|
if !cache || !File.exists?(fullsize)
|
|
generate_fullsize(identity)
|
|
end
|
|
|
|
OptimizedImage.resize(fullsize, filename, size, size)
|
|
filename
|
|
end
|
|
|
|
def cached_path(identity, size)
|
|
dir = "#{cache_path}/#{identity.letter}/#{identity.color.join("_")}"
|
|
FileUtils.mkdir_p(dir)
|
|
|
|
"#{dir}/#{size}.png"
|
|
end
|
|
|
|
def fullsize_path(identity)
|
|
cached_path(identity, FULLSIZE)
|
|
end
|
|
|
|
def generate_fullsize(identity)
|
|
|
|
color = identity.color
|
|
letter = identity.letter
|
|
|
|
filename = fullsize_path(identity)
|
|
stroke = darken(color, 0.8)
|
|
|
|
instructions = %W{
|
|
-size 240x240
|
|
xc:#{to_rgb(color)}
|
|
-pointsize 200
|
|
-fill white
|
|
-gravity Center
|
|
-font 'Helvetica'
|
|
-stroke #{to_rgb(stroke)}
|
|
-strokewidth 2
|
|
-annotate -5+25 '#{letter}'
|
|
'#{filename}'
|
|
}
|
|
|
|
`convert #{instructions.join(" ")}`
|
|
|
|
filename
|
|
end
|
|
|
|
def darken(color,pct)
|
|
color.map do |n|
|
|
(n.to_f * pct).to_i
|
|
end
|
|
end
|
|
|
|
def to_rgb(color)
|
|
r,g,b = color
|
|
"'rgb(#{r},#{g},#{b})'"
|
|
end
|
|
end
|
|
|
|
# palette of optimally disctinct colors
|
|
# cf. http://tools.medialab.sciences-po.fr/iwanthue/index.php
|
|
# parameters used:
|
|
# - H: 0 - 360
|
|
# - C: 0 - 2
|
|
# - L: 0.75 - 1.5
|
|
COLORS = [[198,125,40],
|
|
[61,155,243],
|
|
[74,243,75],
|
|
[238,89,166],
|
|
[52,240,224],
|
|
[177,156,155],
|
|
[240,120,145],
|
|
[111,154,78],
|
|
[237,179,245],
|
|
[237,101,95],
|
|
[89,239,155],
|
|
[43,254,70],
|
|
[163,212,245],
|
|
[65,152,142],
|
|
[165,135,246],
|
|
[181,166,38],
|
|
[187,229,206],
|
|
[77,164,25],
|
|
[179,246,101],
|
|
[234,93,37],
|
|
[225,155,115],
|
|
[142,140,188],
|
|
[223,120,140],
|
|
[249,174,27],
|
|
[244,117,225],
|
|
[137,141,102],
|
|
[75,191,146],
|
|
[188,239,142],
|
|
[164,199,145],
|
|
[173,120,149],
|
|
[59,195,89],
|
|
[222,198,220],
|
|
[68,145,187],
|
|
[236,204,179],
|
|
[159,195,72],
|
|
[188,121,189],
|
|
[166,160,85],
|
|
[181,233,37],
|
|
[236,177,85],
|
|
[121,147,160],
|
|
[234,218,110],
|
|
[241,157,191],
|
|
[62,200,234],
|
|
[133,243,34],
|
|
[88,149,110],
|
|
[59,228,248],
|
|
[183,119,118],
|
|
[251,195,45],
|
|
[113,196,122],
|
|
[197,115,70],
|
|
[80,175,187],
|
|
[103,231,238],
|
|
[240,72,133],
|
|
[228,149,241],
|
|
[180,188,159],
|
|
[172,132,85],
|
|
[180,135,251],
|
|
[236,194,58],
|
|
[217,176,109],
|
|
[88,244,199],
|
|
[186,157,239],
|
|
[113,230,96],
|
|
[206,115,165],
|
|
[244,178,163],
|
|
[230,139,26],
|
|
[241,125,89],
|
|
[83,160,66],
|
|
[107,190,166],
|
|
[197,161,210],
|
|
[198,203,245],
|
|
[238,117,19],
|
|
[228,119,116],
|
|
[131,156,41],
|
|
[145,178,168],
|
|
[139,170,220],
|
|
[233,95,125],
|
|
[87,178,230],
|
|
[157,200,119],
|
|
[237,140,76],
|
|
[229,185,186],
|
|
[144,206,212],
|
|
[236,209,158],
|
|
[185,189,79],
|
|
[34,208,66],
|
|
[84,238,129],
|
|
[133,140,134],
|
|
[67,157,94],
|
|
[168,179,25],
|
|
[140,145,240],
|
|
[151,241,125],
|
|
[67,162,107],
|
|
[200,156,21],
|
|
[169,173,189],
|
|
[226,116,189],
|
|
[133,231,191],
|
|
[194,161,63],
|
|
[241,77,99],
|
|
[241,217,53],
|
|
[123,204,105],
|
|
[210,201,119],
|
|
[229,108,155],
|
|
[240,91,72],
|
|
[187,115,210],
|
|
[240,163,100],
|
|
[178,217,57],
|
|
[179,135,116],
|
|
[204,211,24],
|
|
[186,135,57],
|
|
[223,176,135],
|
|
[204,148,151],
|
|
[116,223,50],
|
|
[95,195,46],
|
|
[123,160,236],
|
|
[181,172,131],
|
|
[142,220,202],
|
|
[240,140,112],
|
|
[172,145,164],
|
|
[228,124,45],
|
|
[135,151,243],
|
|
[42,205,125],
|
|
[192,233,116],
|
|
[119,170,114],
|
|
[158,138,26],
|
|
[73,190,183],
|
|
[185,229,243],
|
|
[227,107,55],
|
|
[196,205,202],
|
|
[132,143,60],
|
|
[233,192,237],
|
|
[62,150,220],
|
|
[205,201,141],
|
|
[106,140,190],
|
|
[161,131,205],
|
|
[135,134,158],
|
|
[198,139,81],
|
|
[115,171,32],
|
|
[101,181,67],
|
|
[149,137,119],
|
|
[37,142,183],
|
|
[183,130,175],
|
|
[168,125,133],
|
|
[124,142,87],
|
|
[236,156,171],
|
|
[232,194,91],
|
|
[219,200,69],
|
|
[144,219,34],
|
|
[219,95,187],
|
|
[145,154,217],
|
|
[165,185,100],
|
|
[127,238,163],
|
|
[224,178,198],
|
|
[119,153,120],
|
|
[124,212,92],
|
|
[172,161,105],
|
|
[231,155,135],
|
|
[157,132,101],
|
|
[122,185,146],
|
|
[53,166,51],
|
|
[70,163,90],
|
|
[150,190,213],
|
|
[210,107,60],
|
|
[166,152,185],
|
|
[159,194,159],
|
|
[39,141,222],
|
|
[202,176,161],
|
|
[95,140,229],
|
|
[168,142,87],
|
|
[93,170,203],
|
|
[159,142,54],
|
|
[14,168,39],
|
|
[94,150,149],
|
|
[187,206,136],
|
|
[157,224,166],
|
|
[235,158,208],
|
|
[109,232,216],
|
|
[141,201,87],
|
|
[208,124,118],
|
|
[142,125,214],
|
|
[19,237,174],
|
|
[72,219,41],
|
|
[234,102,111],
|
|
[168,142,79],
|
|
[188,135,35],
|
|
[95,155,143],
|
|
[148,173,116],
|
|
[223,112,95],
|
|
[228,128,236],
|
|
[206,114,54],
|
|
[195,119,88],
|
|
[235,140,94],
|
|
[235,202,125],
|
|
[233,155,153],
|
|
[214,214,238],
|
|
[246,200,35],
|
|
[151,125,171],
|
|
[132,145,172],
|
|
[131,142,118],
|
|
[199,126,150],
|
|
[61,162,123],
|
|
[58,176,151],
|
|
[215,141,69],
|
|
[225,154,220],
|
|
[220,77,167],
|
|
[233,161,64],
|
|
[130,221,137],
|
|
[81,191,129],
|
|
[169,162,140],
|
|
[174,177,222],
|
|
[236,174,47],
|
|
[233,188,180],
|
|
[69,222,172],
|
|
[71,232,93],
|
|
[118,211,238],
|
|
[157,224,83],
|
|
[218,105,73],
|
|
[126,169,36]]
|
|
end
|