module Colorizeable

# File lib/colorizeable.rb, line 18
def rgb_to_xterm(r,g,b)
  ->c{
    d=0,95,135,175,215,255                 # d is the set of possible RGB values
    a=(0..239).map{|n|                     # Create the array of Xterm triplets
      n<216 ? [d[n/36],d[(n%36)/6],d[n%6]] # Convert x from base 6 to base d, or
            : [n*10-2152]*3                #   create a uniform triplet
    }.map{|t|
      t.zip(c).map{|a,b|(a-b).abs}.sum     # Map from triplets to Manhattan distance
    }
    a.rindex(a.min) +                      # Find the last index of the lowest distance
    16                                     # Offset for the exluded system colors
  }.call([r,g,b])
end

# File lib/colorizeable.rb, line 5
def xterm_color
  step = self.class.color_width/self.class.max_dist.to_f
  intensity = ((step * dist) + self.class.hue) % 256
  if dist == 0
    rgb_to_xterm(50,50,50)
  else
    col = Chroma.paint("hsl(#{intensity}, 100%, 65%)")
    rgb = col.rgb
    rgb_to_xterm(rgb.r, rgb.g, rgb.b)
  end
end